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2011•T'u Jang T'ung PaoRequires access

Effect of Bentonite on Competitive Adsorption of Heavy Metals Ions

HU Ke-wei

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Abstract

The influence of bentonite on the competitive adsorption characteristic of Cd2+,Zn2+,Cu2+ and Pb2+ were studied under the conditions of pH=6,T=25℃ and low concentration of heavy metals.The results showed that adsorption of lead ions was decreased insignificantly in competitive adsorption condition,whereas a dramatic decrease was observed on the adsorption of cadmium ions by the presence of lead,copper and zinc ions.As compare to single system the enrichment coefficients of Cd2+ ions in competitive system reduced by 19.20%-37.50%,while Pb2+ ions reduced by 0.41%-2.83%.The enrichment coefficients of Cd2+,Zn2+,Cu2+ and Pb2+ ions by bentonite follow the descending order: Pb2+Cu2+Zn2+Cd2+.There was a good correction between this order and first hydrolysis constants of heavy metal ions.

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The influence of bentonite on the competitive adsorption characteristic of Cd2+,Zn2+,Cu2+ and Pb2+ were studied under the conditions of pH=6,T=25℃ and low concentration of heavy metals.The results showed that adsorption of lead ions was decreased insignificantly in competitive adsorption condition,whereas a dramatic decrease was observed on the adsorption of cadmium ions by the presence of lead,copper and zinc ions.As compare to single system the enrichment coefficients of Cd2+ ions in competitive system reduced by 19.20%-37.50%,while Pb2+ ions reduced by 0.41%-2.83%.The enrichment coefficients of Cd2+,Zn2+,Cu2+ and Pb2+ ions by bentonite follow the descending order: Pb2+Cu2+Zn2+Cd2+.There was a good correction between this order and first hydrolysis constants of heavy metal ions.

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Available abstract

The influence of bentonite on the competitive adsorption characteristic of Cd2+,Zn2+,Cu2+ and Pb2+ were studied under the conditions of pH=6,T=25℃ and low concentration of heavy metals.The results showed that adsorption of lead ions was decreased insignificantly in competitive adsorption condition,whereas a dramatic decrease was observed on the adsorption of cadmium ions by the presence of lead,copper and zinc ions.As compare to single system the enrichment coefficients of Cd2+ ions in competitive system reduced by 19.20%-37.50%,while Pb2+ ions reduced by 0.41%-2.83%.The enrichment coefficients of Cd2+,Zn2+,Cu2+ and Pb2+ ions by bentonite follow the descending order: Pb2+Cu2+Zn2+Cd2+.There was a good correction between this order and first hydrolysis constants of heavy metal ions.

Key concepts: Adsorption, Bentonite, Metal ions in aqueous solution, Cadmium, Chemistry, Ion, Copper, Zinc

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