An-Najah National University

Mohammed Mahmoud Al-Subu'


  • Thursday, May 1, 2008
  • Efficiency of removal of cadmium from aqueous solutions by plant leaves and the effects of interaction of combinations of leaves on their removal efficiency
  • Published at:Journal of Environmental Management, Volume 87, Issue 3, May 2008, Pages 521-532
  • Removal 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 4.1, 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 10 mg/l 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 le
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  • Wednesday, November 1, 2006
  • Removal of cadmium (II) ions from aqueous solution by Tamrix gallica leaves
  • Published at:Not Found
  • Removal 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 bee
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  • Sunday, February 1, 2004
  • Osmium(VIII)-catalyzed oxidation of pentamethylene sulfide
  • Published at:Not Found
  • Although pentamethylene sulfide (tetrahydrothiopyran) lacks acidic hydrogen, Os-VIII has been found to catalyze its oxidation by alkaline K3Fe(CN)(6) 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, K4Fe(CN)(6), relative permittivity and temperature have also been studied. On the basis of kinetic evidence, a mechanism that involves anation of the osmium catalyst (sulfide/water interchange) followed by intramolecular proton abstraction, followed by an electron transfer step has been proposed and discussed.
    TRANSITION METAL CHEMISTRY    Volume: 29    Issue: 1    Pages: 91-95    Published: FEB 2004  
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  • Tuesday, July 1, 2003
  • Removal of zinc from aqueous solutions by dry plant leaves
  • Published at:PROCESS SAFETY AND ENVIRONMENTAL PROTECTION Volume: 81 Issue: B4 Pages: 236-242 Published: JUL 2003
  • Removal 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 cases.
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  • Sunday, June 1, 2003
  • Impacts of Irrigation with Water Containing Heavy Metals on Soil and Groundwater – A Simulation Study
  • Published at:Not Found
  • This 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, i.e. 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 miner
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Mohammed Mahmoud Al-Subu'
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