ENVIRONMENTAL APPLICATION OF NATURAL BENTONITE AS ADSORPENT OF MERCURY ION FROM AQUEOUS SOLUTION ...

Mercury (Hg (II)) ion adsorption on natural bentonite was examined. Batch studies were used to investigate the effects of pH, initial adsorbent dosage, contact time, and temperature. The maximum removal ratio (90%) was achieved with a 1.5 g/100 mL adsorbent dosage and a reaction duration of 50 minutes at pH 5. In addition, the adsorption kinetics were described using a pseudo-first and second order kinetic model as well as the Weber–Morris model. Correlation coefficient (R2) values were 0.83, 0.96, and 0.95, respectively. This suggests that the adsorption of the Hg (II) ion from aqueous solution onto Natural bentonite followed a pseudo 2nd order kinetic and was spontaneous. The sorption isotherms were described using the Langmuir and Freundlich models. The outcomes revealed The Freundlich and Langmuir models were able to describe the isotherm of a mercury ion on bentonite better (R2= 0.99) than the Freundlich model (R2= 0.95), indicating that the Freundlich and Langmuir models were able to describe the isotherm of a mercury ion on bentonite correctly. The thermodynamic characteristics suggested that the adsorption process was spontaneous and endothermic. The findings show that natural bentonite is effective in removing heavy metals from aqueous solutions and can be utilised as a low-cost alternative to commercial adsorbents.

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