Browsing by Subject "Langmuir Isotherm"
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Item ADSORPTIVE REMOVAL OF ALUMINIUM (III) USING CHEMICALLY MODIFIED SUGARCANE BAGASSE FROM AQUEOUS SOLUTION(Amrit Campus, 2023-08-14) NEPAL, DIWASHA major concern for both humans and aquatic life can result from the presence of several metal ions in an aquatic environment that exceeds the allowed limit. The most efficient way to remove minute levels of hazardous metals from wastewater is through adsorption. The primary goal of this thesis work is to chemically modify sugarcane bagasse in order to create a low-cost, highly effective adsorbent for the removal of Al (III) from an aqueous solution. Both xanthated and charred sugarcane bagasse have been prepared as adsorbents. Adsorbents are characterised using FTIR, EDS, and SEM. For analysis, batch experimental method was carried out. Utilizing both CSB and XSB, the effect of pH, Al (III) concentration and contact time have been investigated using both CSB and XSB adsorbents. For both adsorbents, a 150-minutes maximum duration and a pH of 4 are found to be ideal. The Langmuir isotherm model is best fitted for equilibrium sorption data, and maximum adsorption capacities of CSB and XSB are determined to be 50.9 mg/g and 81.0 mg/g, respectively. Studies on kinetic modelling showed that a pseudo second-order kinetic model best fit the experimental data. These findings show that XSB can be an alternative bio-adsorbent for the elimination of Al(III) from an aqueous solution.Item ADSORPTIVE REMOVAL OF LEAD(II) USING ACTIVATED CARBONACEOUS ADSORBENT OBTAINED FROM WALLNUT SHELL(Juglans regia)(Amrit Campus, 2023-08-17) TIMALSINA, SURESHPresence of heavy metal ions in excess than permissible limit in aquatic environment can cause serious problems to human being and aquatic life. Adsorption is by far the most effective method for the removal of trace amounts of toxic heavy metals from wastewater. The main aim of this thesis work is to prepare a low-cost, effective, and highly efficient adsorbent from the walnut shell by chemical modification for the removal of Pb(II) ions from an aqueous solution. Charred walnut shell (CWS) and xanthated walnut shell (XWS) as adsorbents have been prepared. FTIR, XRD, and SEM characterization are used for the characterization of adsorbents. Batch experiments are performed for analysis. The effect of pH, Pb(II) concentration, and contact time have been investigated using both CWS and XWS adsorbents. The optimum working pH of 4 and optimum time of 150 min are determined for both the adsorbents. Equilibrium sorption data are best fitted for the Langmuir isotherm model and the maximum adsorption capacity of CWS and XWS are found to be 61 mg/g and 109.9 mg/g, respectively. Kinetic modeling studies revealed that the experimental data best fit to pseudo-second-order kinetic model. These results demonstrate that XWS may be an attractive alternative bio-adsorbent for the removal of Pb(II) from an aqueous solution