Browsing by Subject "Sulphuric acid"
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Item Adsorptive Removal of Cr(VI) and Al(III) From Aqueous Solution by Sugarcane Biomass(Faculty of Chemistry, 2012) Mishra, ParamatmaThe potential and effectiveness of activated carbon derived from carbonization of sugarcane bagasse (Saccarhum officianrum) for adsorptive removal of Cr(VI) and Al(III) was examined by adsorption technique. Activated carbon was prepared by subjecting the raw sugarcane bagasse to chemical modification using concentrated sulphuric acid in (1:2) (w/v) of ratio of adsorbent weight to volume of concentrated sulphuric acid (H2 SO4 ). Boehm method was used to estimate the oxygen containing functional groups. The acidic functional groups, specific surface area and adsorptive capacity all greatly increased with chemical modification. The batch removal of Cr(VI) and Al(III) from aqueous solution was investigated. The influence of pH, initial concentration of metal ion and contact time were also investigated. The maximum adsorption capacity of Cr(VI) was found to be 131.68 mg/g at optimum pH of 1 and the maximum adsorption capacity of Al(III) was found to be 125.89 mg/g at optimum pH of 6 at the laboratory temperature respectively. The equilibrium time for Cr(VI) and Al(III) were found to be 180 and 120 minutes respectively. Kinetics of adsorption was found to follow pseudo-second order model. Both Langmuir and Freundlich adsorption isotherm could be used to describe adsorption isotherm but the Langmuir isotherm was found to be in good agreement with experimental data.Item Investigation on the Adsorption Behaviour of lead (Ii) onto Rice Husk Powder(Department of Chemistry, 2012) Das, VijayThe application of low-cost adsorbents obtained from agricultural wastes as analternate to the conventional methods of removing heavy metalions from waste water has been investigated. Present study deals with the adsorption of lead (II) from aqueous solution on rice husk and it’s chemically modified form. Rice Husk is a by-product generally obtained from rice mill.The Chemically Modified Rice Husk (CMRH) is obtained by treating raw ricehusk with 4M sulfuric acid. Batch studies were performed at an initial concentration of 25 mg/L to evaluate the influence of various parameters like pH,equilibrium time, amount of adsorbent and concentration of adsorbate. Studies showed that pH of aqueous solution affected lead (II)adsorption as a result the removal efficiency increased with increasing pH of the solution.The maximum efficiency was achieved at pH 5.Kinetics and isotherm modeling studies demonstrated that the experimental data best fit a pseudo-second order and Langmuir isotherm model, respectively. The maximum Langmuiradsorption capacity was found to be 143.25 mg/g &133.81 for CMRH and RRH, respectively. Furthermore, the studies showed CMRH was more favorable than RRH for the adsorption of lead (II)from aqueous solution.In summary, biosorption onto rice husk is a low cost, effective and simple process for treating Pb(II) loaded waste water.