http://blogs.najah.edu/author/mohd-subu An-Najah Blogs :: Mohammed Mahmoud Al-Subu' en-us Sat, 27 Jul 2024 14:59:24 IDT Sat, 27 Jul 2024 14:59:24 IDT [email protected] [email protected] http://blogs.najah.edu/staff/mohd-subu/article/Efficiency-of-removal-of-cadmium-from-aqueous-solutions-by-plant-leaves-and-the-effects-of-interaction-of-combinations-of-leaves-on-their-removal-efficiencyPublished ArticlesRemoval of cadmium from aqueous solutions using 20 species of plant leaves and combinations of these leaves have been studied Several factors affecting the removal efficiency have been studied The most efficient types of plant leaves for the removal of cadmium are those of styrax plum pomegranate and walnut The interaction effect of the combined leaf samples on the efficiency of removal of cadmium has been found to be additive in combinations involving styrax plant leaves but seems to be antagonistic in all other combinations The optimum experimental conditions for removal of cadmium have been found to be at pH 41 using high concentrations of naturally dried plant leaves using ground leaves and to remove cadmium from agitated aqueous solutions The percentage of metal removed at an initial cadmium concentration of 10mgl by the most efficient types of leaves have been found to be 85 for styrax leaves 85 for plum leaves 80 for pomegranate leaves 78 for walnut leaves and 77 for meddler leaves The presence of foreign ions or complexing agents has been found to reduce the efficiency of removal of cadmium by plant leaves About 8085 of the cadmium in charged plant leaves has been released under the influence of changing the pH of the solution addition of competing ions and the addition of EDTA The results of removal of cadmium by plant leaves have been found to follow the Freundlich adsorption isotherm first-order reaction with respect to cadmium and to have intra-pore diffusion as the rate-limiting step http://blogs.najah.edu/staff/mohd-subu/article/Removal-of-cadmium-II-ions-from-aqueous-solution-by-Tamrix-gallica-leavesPublished ArticlesRemoval of cadmium from aqueous solutions by Tamrix gallica leaves has been investigated The effect of several factors on the removal has been studied including metal ions concentration Tamrix leaves concentration pH presence of competing ions agitation crushing and drying Removal of cadmium by Tamrix leaves was found to be dependant on pH and the maximum removal of cadmium by Tamrix leaves was found at pH 5 The cadmium removal by Tamrix leaves has been found to depend on both the concentration of leaves and the concentration of cadmium in solution The presence of foreign ions along with cadmium ions in water reduce the removal of cadmium in the order Cu Pb Ni Na K Applicability of the Freundlich adsorption isotherm has been examined and the parameters of this isotherm have been calculated The order of reaction between cadmium ions and Tamrix gallica leaves with respect to cadmium has been found to be first order and a mechanism based on adsorption of cadmium on leaves has been suggested JOURNAL OF ENVIRONMENTAL ENGINEERING AND SCIENCEVolume: 5Issue: 6Pages: 509-515Published: NOV 2006http://blogs.najah.edu/staff/mohd-subu/article/OsmiumVIII-catalyzed-oxidation-of-pentamethylene-sulfidePublished ArticlesAlthough pentamethylene sulfide tetrahydrothiopyran lacks acidic hydrogen Os-VIII has been found to catalyze its oxidation by alkaline K3FeCN6 to produce 3-hydroxypentamethylene sulfide as the only product The kinetics reveal first-order dependence on ferricyanide and Os-VIII and zero order on pentamethylene sulfide and OH- The effects of introduced electrolytes K4FeCN6 relative permittivity and temperature have also been studied On the basis of kinetic evidence a mechanism that involves anation of the osmium catalyst sulfidewater interchange followed by intramolecular proton abstraction followed by an electron transfer step has been proposed and discussed TRANSITION METAL CHEMISTRYVolume: 29Issue: 1Pages: 91-95Published: FEB 2004http://blogs.najah.edu/staff/mohd-subu/article/Removal-of-zinc-from-aqueous-solutions-by-dry-plant-leavesPublished ArticlesRemoval of zinc from aqueous solutions by 15 species of plant leaves was studied The maximum efficiency of removal was found to be by walnut and poplar leaves at pH 6 with a maximum removal of 82 Increasing the concentration of plant leaves increased the removal of zinc up to a limit Agitation of solution increased the efficiency of the removal process The presence of competing and complexing agents affected the removal process negatively but also positively in few caseshttp://blogs.najah.edu/staff/mohd-subu/article/Impacts-of-Irrigation-with-Water-Containing-Heavy-Metals-on-Soil-and-Groundwater-ndash-A-Simulation-StudyPublished ArticlesThis research work intended to study the impacts of irrigation water containing various levels of copper lead and zinc on adsorption capacity of soil packed in 4 plastic columns and obtained from two locations around the city of Nablus: Salem A and Deir Sharaf B Results of simulation experiments showed an increase in the copper lead and zinc concentrations in soil and in leachate with increasing the amount of metal in irrigation water Copper lead and zinc concentrations increased also with soil depth and duration of application The results also indicate that the self purification of both soils was highly affected by physical factors ie the intermittent application of irrigation water to the soils in the columns caused soil wetting and drying cycles whichresulted in the formation of cracks in shrinked soils specially in the top half of the columns Crack formation is common in such clay soils due to the climatic conditions Mediterranean type: dry summers and wet winters and type of clay minerals in the soil Thus short circuiting of water through cracks results in moving contaminants fast and deep in the soil profile Water Air Soil Pollution Volume 146 Numbers 1-4 June 2003http://blogs.najah.edu/staff/mohd-subu/article/OsmiumVIII---Catalyzed-oxidation-of-some-cyclic-amines-by-potassium-hexacyanoferrateIII-in-alkaline-media-A-kinetics-and-mechanistic-studyPublished ArticlesReactions of morpholine piperidine and piperazine with OsVIII catalyzed hexacyanoferrateIII in alkaline media to produce the corresponding lactam have been studied at constant temperature and ionic strength The reactions followed first order kinetics with respect to [amine] and [OsVIII] but were independent of [FeCN63-] and [OH-] The effects of introduced electrolytes potassium hexacyanoferrateII relative permitivity and temperature have also been studied A mechanism accounting for these results has been proposed KHIMIYA GETEROTSIKLICHESKIKH SOEDINENIIIssue: 4Pages: 559-565Published: APR 2003http://blogs.najah.edu/staff/mohd-subu/article/Substitution-of-Aquo-Ligands-from-HexaaquochromoiumIII-Ion-by-Cysteine-A-Kinetic-and-Mechanistic-StudyPublished ArticlesSubstitution of aquo lingands from hexaaqouchromolum III ion by Cysteine Hcys has been studied Kinetically at [H] of 10 x 10-2 mol dm-3 The calculated activation parameters H and S have been compared with those of water exchange and related anation reactions of haxaaquochromium III ion The obtained results support an associated path SN2 http:wwwscialertnetqredirectphp?doi=jas2003110112linkid=htmlhttp://blogs.najah.edu/staff/mohd-subu/article/The-interaction-effects-of-cypress-Cupressus-sempervirens-cinchona-Eucalyptus-longifolia-and-pine-Pinus-halepensis-leaves-on-their-efficiencies-for-lead-removal-from-aqueous-solutions-Published ArticlesBatch and isotherm studies were carried out to compare the effectiveness of decaying leaves of cypress Cupressus sempervirens cinchona Eucalyptus longifolia and pine Pinus halepensis to adsorb lead from its aqueous solution and to study the leaf interaction effects Lead removal increased with increasing concentrations of both lead ions and the plant leaves employed Removal efficiency of leaves followed the decreasing order: pinecypresscinchona While cinchona leaves showed an antagonistic effect on the removal efficiencies of cypress pine and a combination of cypress and pine leaves the effect of cypress on the removal efficiency of pine leaves was additive The adsorption of lead by cypress and cinchona leaves was well defined by both the Freundlich and Langmuir isotherms but only the Freundlich isotherm was adopted for pine leaves Desorption of lead from leaves upon standing in deionized water was minimal Advances in Environmental Research Volume 6 Issue 4 October 2002 Pages 569-576 http://blogs.najah.edu/staff/mohd-subu/article/Kinetics-and-mechanisms-of-oxidation-of-1-octene-and-heptanal-by-crown-ether-solubilized-potassium-permanganate-in-non-aqueous-solventsPublished ArticlesThe kinetics of oxidation of 1-octene and heptanal by 18-crown-6-ether-solubilized KMnO4 in benzene and CH2Cl2 have been investigated In benzene the oxidation of 1-octene is first order with respect to the oxidant and zero order with respect to the substrate whereas in CH2Cl2 the reaction is first order with respect to both substrate and oxidant The reaction of heptanal followed different kinetics being first order with respect to both substrate and oxidant regardless of whether benzene or CH2Cl2 was employed as the solvent The values of activation energy E-a standard enthalpy DeltaH standard entropy change DeltaS and standard free energy DeltaG for the reaction are reported Mechanistic pathways for the studied reactions are also proposed TRANSITION METAL CHEMISTRYVolume: 27Issue: 2Pages: 223-227Published: MAR 2002http://blogs.najah.edu/staff/mohd-subu/article/Kinetics-and-Mechanism-of-OsmiumVIII-Catalyzed-Oxidation-of-Thiomorpholine-by-Alkaline-HexacyanoferrateIIIPublished ArticlesThiomorpholine tetrahydro-14-thiazine in the presence of OsVIII as catalyst is oxidized by alkaline hexacyanoferrateIII to 2-hydroxythiomorpholine There is a first-order dependence in [FeCN63 and [OsVIIIJ and zero-order dependence in [thiomorpholine and fOHj The observed rate constant was dependent on [FeCN64] the type of electrolyte and the permitivitty of the reaction medium 10-40 ethanol The proposed mechanism includes the formation of a transient [0s04OH2 ]2-thiomorpholine complex prior to the ratedetermining regeneration of Os by [FeCN63i The values of the enthalpy and entropy of activation are calculated from rate constant values measured at different temperatures 20-40 Chttp://blogs.najah.edu/staff/mohd-subu/article/Oxidation-of-some-Alicyclic-Amines-by-Potassium-Hexacyanoferrate-III-in-Alkaline-Medium-A-Kinetic-and-Mechanistic-StudyPublished ArticlesOxidation of some alicyclic amines morpholine piperazine and piperidine by potassium hexacyanoferrate??? in basic medium has been investigated at 35C Stoichiometric results showed that four moles of hexacyanoferrateIII were consumed per mole of piperidine or morpholine whereas piperazine consumed eight moles of the oxidant to produce the corresponding lactams Kinetic studies indicated that piperidine and morpholine also followed different kinetics from that of piperazine being first order in the amine concentration and independent of the concentrations of hexacyanoferrate??? and hydroxide ion while in the case of piperazine the reaction was first order in both oxidant and substrate concentrations and zero order with respect to the concentration of hydroxide ion The changes in reaction rate due to changing ionic strength of the medium as well as other factors has also been investigated The activation parameters of the oxidation process have been evaluated and a mechanism consistent with the observed kinetics has been proposed Keywords: Hexacyanoferrate??? morpholine piperazine piperidine oxidation lactam An-Najah University Journal for Research - Natural Sciences A ISSN: 1727-2114 Volume 15 2001 Pages: 029-039http://blogs.najah.edu/staff/mohd-subu/article/Removal-of-Dissolved-Copper-from-Polluted-Water-Using-Plant-Leaves-11-Effects-of-Copper-Concentration-Plant-Leaves-Competing-Ions-and-Other-FactorsPublished ArticlesFactors affecting copper removal from polluted water by poplar Populus euphratica leaves were investigated and a mechanism for copper removal was suggested Increasing the amount of leaves from 5 to 25 gL increased the rate and hence the amount of copper removed Increasing the concentration of copper in solution from 2 to 20 mgL caused a corresponding increase in copper uptake per unit weight of leaves at a constant leaf concentration of 20 gL The uptake of copper ions by poplar leaves was found to be noticeably affected by the presence of other metal ions The effect of these ions could be dependent on the relative affinity of leaves to these ions and copper as well as to pH Depending on the initial concentration the presence of the chelating agent EDTA in the solution considerably reduced the rate and amount of copper uptake Fresh leaves were found to uptake much less copper than dry leaves Rough-crushing or fine-grinding of leaves slightly affected copper uptake Agitation slightly increased the rate of copper uptake and cleaning leaves did not affect its ability to uptake copper The main mechanism for copper removal by poplar leaves is most probably adsorption Other mechanisms such as complexation may play a minor role as well Intrapore diffusion is thought to be the rate-limiting step for the interaction between poplar leaves and copperionshttp://blogs.najah.edu/staff/mohd-subu/article/Kinetics-and-mechanism-of-osmiumVIII-catalyzed-oxidation-of-14-thioxane-by-alkaline-hexacyanoferrateIIIPublished ArticlesThe kinetics of oxidation of 14-thioxane 14-oxathiane by alkaline K3FeCN6 have been studied in the presence of Os-VIII as catalyst The reaction is first order in hexacyanoferrateIII and Os-VIII The order in thioxane and OH- is zero While added salts and ethanol have a negligible effect on the oxidation rate K4FeCN6 retards it On the basis of kinetic evidence a mechanism has been proposed TRANSITION METAL CHEMISTRYVolume: 26Issue: 4-5Pages: 461-464Published: 2001http://blogs.najah.edu/staff/mohd-subu/article/Removal-of-Dissolved-Copper-Prom-Polluted-Water-Using-Plant-Leaves-I-Effects-of-Acidity-and-Plant-SpeciesPublished ArticlesRemoval of copper from polluted water by plant leaves was studied using 15 species Copper was recovered in variable percentages depending on the species and pH value of the solution Copper recovery from a 20 mgL copper solution ranged between 88 in poplar leaves and 33 in oak leaves For all leaves studied maximum copper recoveries were found to be between pH 4 and 6 depending on the plant species At pH 2 the copper was not removed by the plant leaves studied Adsorption was suggested as the main mechanism for the reaction between copper ions and plant leaves with a reaction order equal to onehttp://blogs.najah.edu/staff/mohd-subu/article/Stoichiometry-Kinetics-and-Mechanism-of-Oxidation-of-L-Cysteine-by-Hexacyanoferrate-III-In-Acidic-MediaPublished ArticlesThe Stoichiometry kinetics and mechanism of oxidation of L-cysteine by hexacyanoferrate III in acidic media at constant ionic strength have been studied spectrophotometrically A1:1 L-cysteine:hexacyanoferrate III has been established with 1-cysteine as the only product The reaction is zero order in hexacyanoferrate III first order in L-cysteine and inverse first in hydrogen ion concentration The activation parameters were evaluated in the temperature range 15-40C Ea = 282 kJmol S = -1924 Jmol deg The oxidation was inhibited in the presence of added hexacyanoferrate II The effects of other added salts and composition of the solvent have been rationalized Two mechanisms are offered to explain the kinetic datahttp://blogs.najah.edu/staff/mohd-subu/article/Effect-of-root-treatment-of-cauliflower-parsley-and-spinach-plants-with-copper-and-zinc-on-the-plant-growthPublished ArticlesThe effect of copper and zinc ions as growth - inhibitors of plants was studied by the root-treatment of cauliflower parsley and spinach plants Both copper and zinc showed an obvious growth-inhibition effect on the growth of the studied plants as well as on their various parts The sensitivities of cauliflower parsley and spinach plants towards treatment with copper and zinc solutions were compared between each other as well as between their various parts The toxicity effects of zinc and copper on the growth of plants were compared Copper showed higher toxic effect on the growth of treated cauliflower spinach and parsley plants as well as on the growth of the various parts of treated plants Journal of Environmental Science and Health Part A Volume 30 Issue 10 December 1995 pages 2123 - 2132http://blogs.najah.edu/staff/mohd-subu/article/Effects-of-several-factors-on-the-growth-and-on-the-metal-uptake-and-uptake-distribution-of-okra-plant-treated-with-cadmiumPublished ArticlesSeveral factors affecting the growth and the uptake of cadmium by okra plants were studied using both root - treatment and foliar - treatment These factors were the concentration of cadmium type of treatment soil composition presence of foreign ions salinity acidity and temperature Both growth of plant and cadmium uptake by plant were affected highly by the concentration of cadmium type of treatment soil composition salinity and temperature Acidity of solutions has only a little and irregular effect A synergistic combined effect of lead copper and zinc with cadmium was observed on the growth of plant but not regular on the uptake of cadmium Journal of Environmental Science and Health Part A Volume 30 Issue 9 October 1995 pages 2027 - 2040http://blogs.najah.edu/staff/mohd-subu/article/Effects-of-several-factors-on-the-growth-and-on-the-metal-uptake-distribution-of-pepper-plants-treated-with-cadmiumPublished ArticlesSeveral factors affecting the growth and the metal uptake of pepper plants treated with cadmium solutions have been studied These include concentration of cadmium type of treatment type of soil plant species and some properties of solutions used for treatment such as acidity degree of salinity and temperature Cadmium had an obvious effect on the growth of pepper plants Foliar-treated plants were affected more than root-treated plants The least degree of growth-inhibition and of cadmium uptake was found in plants grown in soils with high organic matter content Various species of pepper plants acted very differently towards cadmium treatment Both growth-inhibition and cadmium uptake was increased in plants treated with acidic saline and hot solutions Journal of Environmental Science and Health Part A Volume 30 Issue 8 September 1995 pages 1659 - 1684http://blogs.najah.edu/staff/mohd-subu/article/Effect-of-irrigation-with-lead-and-cadmium-on-the-growth-and-on-the-metal-uptake-of-cauliflower-spinach-and-parsley-Published ArticlesThe effect of root-treatment of cauliflower spinach and parsley plants with lead and cadmium were studied Both metal ions showed obvious growth inhibition of treated plants with cadmium having higher toxicity on growth than lead Cadmium was more concentrated in the edible parts of the three treated plants whereas lead was more concentrated in the edible parts of cauliflower and spinach plants only Metal ion concentrations and total metal ion content of treated plants increased with the increase of concentration of cadmium or lead ions in solutions used for treatment The uptake of metal ion per unit concentration decreased in treated plants with the increase of concentration of cadmium or lead ions in solutions used for treatment Metal ion concentration and metal uptake were higher in the plants treated with cadmium than those treated with lead Journal of Environmental Science and Health Part A Volume 30 Issue 4 May 1995 pages 831 - 849http://blogs.najah.edu/staff/mohd-subu/article/Removal-of-lead-from-polluted-water-using-decaying-leavesPublished ArticlesDecaying leaves have been proven capable of partially removing lead from polluted water Several factors affecting the removal process have been studied These include the concentration of lead ions concentration of leaves drying leaves degree of crushing of leaves leaf extracts pH agitation and presence of competing and of complexing agents The relative capability of some common types of leaves for the removal of lead from water has been studied The release of lead from leaves saturated with lead ions has been studied under the effect of varying pH addition of competing ions and the addition of complexing agents The results of the present work indicate that the interaction between lead ions and leaves is mainly an adsorption process and fit the Freundlich adsorption isotherm whose parameters have also been calculated A fractional order of reaction 07 has been determined for the reaction between lead ions and leaves using two methods of evaluation A mechanism in which film diffusion being the most probable limiting step has been suggested Journal of Environmental Science and Health Part A Volume 29 Issue 10 December 1994 pages 2087 - 2114http://blogs.najah.edu/staff/mohd-subu/article/Combined-Effects-of-Cadmium-Lead-and-Copper-on-the-Growth-and-on-Metal-Uptake-of-Broad-Beans-Carrots-Radishes-and-Marrow-VegetablesPublished Articles Toxic symptoms of plants treated with a metal ion may not always be due to the increase of the uptake of this metal by plant but might be the result of the effect of the addition of this metal on the uptake of the other metal ions by plant Thus the study of the effects of combined treatments with more than one metal is important In the present study we have studied using root-treatment and foliar-treatment the combined effect of lead cadmium and copper on the growth of broad beans radishes carrots and marrow vegetables The effect of presence of each metal ion on the uptake of the other metal ions on the various parts of the plants by both root-treatment and foliartreatment of plants have also been studied The results have shown that the combined effect of metal ions differs from one case to another with variation of the metal ions piant part of piant or type of treatment http://blogs.najah.edu/staff/mohd-subu/article/Effects-of-root-and-foliar-treatments-with-lead-cadmium-and-copper-on-the-uptake-distribution-and-growth-of-radish-plants-Published ArticlesThe effects of treatment of radish plants with cadmium lead and copper were studied Both root treatment and foliar treatment were used All three elements were found to inhibit the growth of radish plants Cadmium and lead were greater growth inhibitors than copper on the plant Effects of cadmium and copper were greater on the growth of shoots while the effect of lead was greater on the growth of roots Foliar treatment was more harmful to plant growth than root treatment The uptake of metal ions and the distribution of this uptake in the roots and shoots of treated plants were determined Cadmium and copper uptake by plant was concentrated mostly in the shoots while the uptake of lead was concentrated more in the roots of treated radish plants The amount of metal uptake increased with the increase in metal ion used in treatment of plants The amount of uptake was higher in foliar-treated plants than in root-treated plants Concentration of cadmium and lead exceeded the maximum allowed limit in foods in most cases; concentration of copper exceeded the maximum allowed limit in food only in one sample The percentage of metal ions taken up by plants from the total amount of metal ions added during treatment was very small This percentage was comparatively higher in the case of foliar treatment than in the case of root treatment It was also higher from solutions having low concentrations of metal ions than from solutions having high concentrations of metal ions Environment International Volume 19 Issue 4 1993 Pages 393-404 http://blogs.najah.edu/staff/mohd-subu/article/Effects-on-growth-and-uptake-distribution-of-root-and-foliar-treatments-of-marrow-plants-with-cadmium-and-lead-solutionsPublished ArticlesIn this study the effects of root and foliar treatments of marrow plants with cadmium and lead solutions on the growth of the various parts of plant roots stem leaves and fruits have been studied Growth inhibition of the various parts of treated plants has been compared with each other and for the two types of treatment The toxicity of cadmium on the growth of plant has been compared with the toxicity of lead on the various parts of plants treated by root or by foliar-treatment with metal ions Cadmium and lead uptake by plants and the distribution of this uptake between the various parts of treated plants have been determined and commented on Percentages of cadmium or lead taken by plant from the total amount of cadmium or lead added during treatment have been calculated and found to be very small This percentage has been found to be higher in foliar-treated plants and from dilute solutions than in root-treated plants and from more concentrated cadmium or lead solutions Journal of Environmental Science and Health Part A Volume 27 Issue 8 December 1992 pages 2173 - 2190http://blogs.najah.edu/staff/mohd-subu/article/Effects-of-root-and-foliar-treatments-of-carrot-plants-with-lead-and-cadmium-on-the-growth-uptake-and-the-distribution-of-uptake-of-metals-in-treated-plantsPublished ArticlesToxicity of cadmium and lead on the growth of carrot plants has been studied Cadmium has been found to be more toxic than lead especially on the shoots of carrot plants Foliar treatment has been compared with root-treatment for the two elements on carrots and on their roots and shoots Concentrations and total contents of lead and cadmium in whole plant in roots and in shoots have been determined for treated carrot plants and compared in root-treatment with foliar-treatment Explanations have been suggested whenever possible to illucidate the results obtained Percentages of the metals taken by plants from the whole amounts of metal added during treatment have been calculated and related to type of metal used concentration of metal in solutions used for treatment and the way of treatment Journal of Environmental Science and Health Part A Volume 27 Issue 7 October 1992 pages 1739 - 1758http://blogs.najah.edu/staff/mohd-subu/article/Effects-on-growth-and-uptake-of-broad-beans-Vicia-fabae-L-by-root-and-foliar-treatments-of-plant-with-lead-and-cadmiumPublished ArticlesUptake of toxic metals by plants has been of great interest to environmental scientists because this might harm the growth of plant and cause health hazard to man and animal In this study the effects of two elements lead and cadmium which cause high concern because of their cummulative nature have been studied on broad beans Both elements have been found to affect the growth of broad beans and this effect increased with the increase of concentration of metal in solutions used for root-treatment or for foliar-treatment of plant The effect of foliar-treatment was very much higher than the effect of root-treatment by lead or cadmium Cadmium was found more toxic to plant growth than lead The effect of cadmium treatment was more on the growth of fruits while the effect of lead treatment was more on the roots of broad beans The least affected part by lead or cadmium was the stem of plant Both the concentration and the whole content of metal in plants and its varoius parts roots stem leaves and fruits increased steadily with the increase of cadmium or lead concentration in solutions used for either root-treatment or foliar-treatment Concentration of metal ions was higher in roots and leaves than in fruits and stems of treated plants The uptake of metal to plant was calculated to be a very small part of the total amount of metal added during treatment Some explanations have been suggested in this study to explain the results obtained Journal of Environmental Science and Health Part A Volume 27 Issue 7 October 1992 pages 1619 - 1642http://blogs.najah.edu/staff/mohd-subu/article/Uptake-of-cadmium-from-water-by-beech-leavesPublished ArticlesUptake of cadmium from aqueous solutions by beech leaves has been studied The effect of several factors on both rate and amount of this uptake has been studied These factors include concentration of leaves concentration of cadmium pH competing ions and drying leaves The pattern of the curves showing the loss of cadmium from solution has been explained Applicability of the Frendlich adsorption isotherm on the present results has been examined and the parameters of this isotherm have been calculated The order of reaction between cadmium ions and beech leaves has been determined and a mechanism for this reaction has been suggested Journal of Environmental Science and Health Part A Volume 27 Issue 3 April 1992 pages 603 - 627http://blogs.najah.edu/staff/mohd-subu/article/Short-Communication-Kinetics-and-Mechanism-of-Oxidation-of-Diallylamine-by-Alkaline-Hexacyanoferrate-IIIPublished ArticlesThe kinetics of oxidation of diallylamine by hexacyanoferrate III in alkaline aqueous ethanol at constant ionic strength has been studied The rate of the reaction was dependent on the first power of the concentration of diallylamine but was independent of hexacyanoferrate III concentration The rate was enhanced by an increase in the pH value The effects of added hexacyanoferrate II ionic strength types of anion and cation and the solvent composition have also been investigated The activation parameters were evaluated A mechanism consistent with the kinetic results is proposed and discussedhttp://blogs.najah.edu/staff/mohd-subu/article/Kinetics-and-Mechanism-of-Oxidation-of-Arylhydrazides-by-HexacyanoferrateIii-in-Alkaline-MediumPublished ArticlesThe kinetics of oxidation of a series of arylhydrazides X-PhCONHNH2 X = H p-Cl p-CH3 and omicron-NO2 by alkaline hexacyanoferrateIII have been investigated The reactions are first order each in [oxidant] and [substrate] and fractional order in [OH-] The effects of added hexacyanoferrateII and other ions on the rate of oxidation have been investigated The kinetics reveal a pronounced positive salt effect as well as specific ion effect The temperature and solvent effects have also been studied A suitable mechanism and a rate law consistant with the experimental results have been proposed INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL ANALYTICAL CHEMISTRYVolume: 30Issue: 8Pages: 717-719Published: AUG 1991http://blogs.najah.edu/staff/mohd-subu/article/Kinetics-and-Mechanism-of-Oxidation-of-Triallylamine-by-Alkaline-Potassium-HexacyanoferrateIIIPublished ArticlesKinetics of the oxidation of triallylamine by hexacyanoferrateIII in alkaline medium have been studied The rate is independent of the concentration of FeCN63- while the orders in [triallylamine] and [OH-] are nearly unity and 033 respectively The rate of the reaction is not retarded by added FeCN64- ions The effects of ionic strength varying cations and anions of added salts solvent composition and temperature on the reaction rate are reported A suitable mechanism has been proposed Journal of The Indian Chemical Society Volume: 67 Issue: 12 Pages: 966-969 Published: DEC 1990http://blogs.najah.edu/staff/mohd-subu/article/Kinetics-and-mechanism-of-oxidation-of-phenylhydrazine-and-P-bromophenylhydrazine-by-hexacyanoferrateIII-in-acidic-mediumPublished ArticlesKietics of oxidation of phenylhydrazine and p-bromophenylhydrazine by hexacyanoferrateIII in acidic medium have been studied The reactions follow similar kinetics being first order with respect to both hydrazine and exacyanoferrateIII and inverse first order with respect to the hydrogen ion Addition of hexacyanoferrateII has no retarding effect on the rate of oxidation The effects of varying ionic strength dielectric constant and temperature on the reaction rates have been investigated A plausible mechanism has been proposed to account for the experimental results Benzene and bromobenzene have been identified as the oxidation products International Journal of Chemical Kinetics Volume 22 Issue 10 Pages 1027 - 1037