Evaluation of the Efficiency of Hydrochloric Acid Modified Red Mud in Removing Diclofenac from Aqueous Solution | ||||
Journal of Pharmaceutical and Applied Chemistry | ||||
Volume 6, Issue 1, January 2020, Page 1-9 PDF (339.9 K) | ||||
Document Type: Original Article | ||||
DOI: 10.18576/jpac/060103 | ||||
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Authors | ||||
C. Tsamo1; A. palthahe2; E. H. Miss Tjilha2; G. T. Nyadjou Djabo2 | ||||
1Department of Chemistry, Higher Teachers’ Training College Maroua, P.O. Box 55 Maroua, Cameroon. 2Department of Agricultural and Environmental Engineering, College of Technology, University of Bamenda, P.O. Box 39 Bambili, Cameroon | ||||
2Department of Chemistry, Higher Teachers’ Training College Maroua, P.O. Box 55 Maroua, Cameroon | ||||
Abstract | ||||
This study is aimed at evaluating the efficiency of hydrochloric acid, modified red mud in removing diclofenac (DCF) from aqueous solution. Red mud produced was treated with 2.25 M HCl, noted RMH. Batch experiments were used to determine the effects of time of stirring/initial concentration, pH, adsorbent dose and temperature on the efficiency of DCF adsorption on RMH. pH was the main parameter that controls DCF adsorption, with removal of 95 % at pH of 4 in 10 minutes. But the increase in temperature decreased DCF adsorption from 95 % at 298 K to 62 % at 333 K. Equilibrium was attained in 10 minutes for all the parameters tested. Langmuir isotherm fitted the adsorption with maximum adsorption capacity values of 500 and 222 mg/g at 1050 and 500 mg/L initial concentrations respectively. Adsorption was very favourable with very low RL values (0.003-0.0003). Adsorption energies obtained from the Dubinin–Radushkevich isotherm revealed that physical adsorption was the main mechanism of adsorption. Pseudo-second order kinetic model best explained the adsorption with initial sorption rates increasing with increasing initial concentration. The removal process was very spontaneous and exothermic. HCl treated red mud is very efficient in removing DCF from aqueous solution. | ||||
Keywords | ||||
Adsorption; Diclofenac; pH; Red mud; Thermodynamics | ||||
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