Mono-/competitive adsorption of cadmium(II) and lead(II) using straw/bentonite-g-poly(acrylic acid-co-acrylamide) resin
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We investigated the adsorption of Cd2+ and Pb2+ using straw/bentonite-g-poly(acrylic acid-co-acrylamide) resin as an adsorbent in single and binary-component systems. The resin was characterized by various analytical techniques. Adsorption experiments were conducted by varying the pH, adsorbent dosage, initial concentration and temperature. Adsorption data for Cd2+ and Pb2+ fitted the Langmuir isotherm in the single-component system. Kinetic data for Cd2+ and Pb2+ followed the pseudo-second-order kinetic in a single-component system. A maximum adsorption for Cd2+ occurred at pH 5, whereas for Pb2+, the maximum Cd2+ adsorption occurred at pH 3. The maximum Cd2+ and Pb2+ adsorption capacities were 315.1 mg g−1 and 355.5 mg g−1, respectively. In the binary-component system, the presence of Cd2+ could improve the adsorption capacity of Pb2+ and the presence of Pb2+ could reduce the adsorption capacity of Cd2+ when the Cd2+ concentration was high. This study provides realistic and valid data on resin use to remove heavy metal ions from aqueous solutions.
KeywordsAdsorption Binary-component system Bentonite Heavy metal Resin Rice straw
This thesis is financed by Jiang Su Provincial “Youth Blue” (Cradle for Young Scholars Development) Project for Higher Education and National Natural Science Foundation of China (Grant No. 51779075).
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