Adsorption Efficiency of Cyanide by Rice Husk and Acid Modified Rice Husk
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Abstract
The efficiency of rice husk and acid modified rice husk as sorbent for cyanide removal in solution was studied. The adsorption study was performed in aqueous solution. The factors of adsorption including activated rice husk by various acids concentration of CN- solution, quantity of adsorbents, volume of adsorbents, pH and contact time and the application was the removal of cyanide in industrial wastewater, it was found the optimum condition of that adsorption of rice husk (RH) and modified rice husk by HCl (HCl-RH) was adsorbent dose of 0.1 g, initial cyanide concentration of 0.05 mg/L at pH 5 and contact time of 72 hour. The cyanide adsorption percentages were 42.01 and 95.03. The adsorption capacity of cyanide were 0.90 and 1.92 mg L-1 respectively. The adsorption capacity of iodine were 620 and 840 mg/g respectively. The kinetics modeling of adsorption of both adsorbents were corresponds to Pseudo-second order model and adsorption isotherm were consistent with the Langmuir isotherm. The cyanide removal percentages of RH and HCl-RH in the industrial wastewater were 40.90 and 91.79 respectively. The results demonstrated rice husks have a good characteristic as adsorbent and adding value to agricultural waste material.
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