Utilization of fly ash from power plant for adsorption of hydrocarbon contamination in water
Keywords:Polycyclic aromatic hydrocarbons, Cethyltrimethylammoniumbromide, Naphthalene, Adsorption, Silica from Rice husk
AbstractAdsorption efficiency of polycyclic aromatic hydrocarbons (PAHs) contamination in water with rice husk fly ash from a power plant was investigated in comparison with coal fly ash and silica from rice husk fly ash, with and without surface treatment. Naphthalene was used as a representative for PAHs,and Cethyltrimethylammoniumbromide (CTAB) was used as surface treating agent for the present study. Various factors, such as shaking rate, shaking time, pH of naphthalene aqueous solution, and adsorbent-naphthalene weight ratio, were investigated to identify the optimum condition for each adsorbent. Upon using 0.3 g adsorbent in 100 ml of 10 mg/l naphthalene solution, the optimum condition was observed to be shaking the mixture of an adsorbent and naphthalene solution with pH 2 at 250 rpm for 60 minutes. Similar optimum conditions were also observed for all adsorbents used in the present study, except for the highest efficiency of silica from rice husk fly ash treated with CTAB. In addition, upon varying weight ratios of adsorbent and naphthalene, adsorption efficiency was observed to gradually increase and reach equilibrium at the ratio of 0.7 g adsorbent per mg naphthalene. Therefore, the optimum condition for the present study should be using 0.7 g adsorbent per mg naphthalene in solution with pH 2 and shaking at 250 rpm for 60 minutes. The adsorption behavior of the system was also investigated and found to be in line with Freundlich Isotherm.
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