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Articles by Modher A. Hussain
Total Records ( 1 ) for Modher A. Hussain
  Modher A. Hussain , Aishah Salleh and Pozi Milow

Background: Current methods to remove lead (II) are only effective for high concentration of the metal ions. The possibility of using nonliving algal biomass to remove the metal ions at lower concentration is examined in this study.
Objective: The main objective is investigation of efficiency and efficacy of adsorption of lead (II) by nonliving algal biomass Spirogyra neglecta. The effect of pH, temperature, initial contact time on the adsorption of the metal was studied. Functional groups and morphology of the nonliving biomass of the alga , the isothermics and kinetics of the adsorption were also examined.
Fresh algal biomass of Spirogyra neglecta was collected then dried and sieved. A Stock solution of lead (II) was prepared using lead (II) nitrate in distilled water. Lead (II) solutions of different concentrations were obtained by diluting the stock solution. Standard solution of lead (II) (150 mg L-1) analysis in atomic adsorption spectrophotometer. Standard acid and base solutions (0.1N HCl and 0.1N NaOH) were used for pH adjustments. The equilibrium isotherms and kinetics were obtained from batch adsorption experiments. The surface characteristics of the nonliving algal biomass were examined using scanning electron microscope and Fourier Transformed Infrared. The maximum adsorption capacity of the nonliving algal biomass was also determined. The effects of initial concentration and contact time, pH, and temperature on the adsorption of lead (II) by the nonliving algal biomass were measured.
Results: Adsorption capacity of lead (II) increased with the increase of pH and temperature. Langmuir isothermic model fitted the equilibrium data. The adsorption kinetics followed the pseudo-second-order kinetic model meaning the adsorption is chemisorptions. The nonliving algal biomass exhibited cave-like, uneven surface texture along with lot of irregular surface. FTIR analysis of the alga biomass revealed the presence of carboxyl, amine and carboxyl group which were responsible for adsorption of lead (II). The maximum adsorption capacity (qmax) of lead (II) by the nonliving biomass of Spirogyra neglecta was 132 mgg-1.
The present study shows that the nonliving biomass of Spirogyra neglecta has the potential as a biosorbent for lead. The maximum adsorption capacity for lead (II) is higher than reported for other biosorbents of lead (II) by the nonliving biomass of Spirogyra neglecta are characterized by the initial concentration of lead (II), temperature and pH of the solution, Langmuir isothermic model, and pseudo-second-order kinetic models. These are useful in predicting the behavior of the biosorbent under the different conditions so that it can be used effectively to remove heavy metals such as lead.

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