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Articles by Aishah Salleh
Total Records ( 2 ) for Aishah Salleh
  A.B.M. Sharif Hossain , Aishah Salleh , Amru Nasrulhaq Boyce , Partha chowdhury and Mohd Naqiuddin
  Biodiesel is biodegradable, less CO2 and NOx emissions. Continuous use of petroleum sourced fuels is now widely recognized as unsustainable because of depleting supplies and the contribution of these fuels to the accumulation of carbon dioxide in the environment. Renewable, carbon neutral, transport fuels are necessary for environmental and economic sustainability. Algae have emerged as one of the most promising sources for biodiesel production. It can be inferred that algae grown in CO2-enriched air can be converted to oily substances. Such an approach can contribute to solve major problems of air pollution resulting from CO2 evolution and future crisis due to a shortage of energy sources. This study was undertaken to know the proper transesterification, amount of biodiesel production (ester) and physical properties of biodiesel. In this study we used common species Oedogonium and Spirogyra to compare the amount of biodiesel production. Algal oil and biodiesel (ester) production was higher in Oedogonium than Spirogyra sp. However, biomass (after oil extraction) was higher in Spirogyra than Oedogonium sp. Sediments (glycerine, water and pigments) was higher in Spirogyra than Oedogonium sp. There was no difference of pH between Spirogyra and Oedogonium sp. These results indicate that biodiesel can be produced from both species and Oedogonium is better source than Spirogyra sp.
  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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