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Removal of molybdate on to industrial solid waste Fe(III)/Cr(III) hydroxide as adsorbent has been investigated. Pretreated adsorbent was found to be more efficient in the uptake of molybdate compared to untreated adsorbent. Effect of pH on the adsorption was studied in the pH range 4.0 to 10.0. Optimum pH for maximum removal was found to be 4.0. Langmuir and Freundlich isotherm models were used to study the adsorption capacity of the adsorbent. The adsorption follows second order kinetics. No significant effect of temperature has been observed. Desorption studies showed that ion exchange mechanism is predominant.
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Namasivayam et al. (2006) studied this question.
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