Abstract
Pure and 0.25% Ni 2+ ion doped goethite samples, prepared by the coprecipitation method, were characterized for pH of Point of Zero Charge (pH pzc), Surface area, XRD, TG-DTA, FTIR and TEM. Effect of Ni 2+ ions doping on the adsorption of chromate on goethite was investigated at pH-3, -5 and -7 in the temperature range 303–323 K. It was found that adsorption of chromate increases with decreasing pH and increasing temperature on both pure and Ni 2+-doped goethite. Adsorption of chromate was found to increase from 61.4% to 82.92% with Ni 2+ ion doping in goethite matrix at the lowest pH (pH-3) and highest temperature (323 K), using 1.02 mmol L −1 chromate solution. Langmuir isotherm was found applicable to the experimental data. The values of Δ H ¯ (isosteric heat of adsorption) calculated for both the samples of goethite were positive, showing endothermic nature of the adsorption process.
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