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《Geochimica》 2004-02
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Adsorption of chromium (Ⅵ) by Mg/Al layered double oxides

ZHENG Li bo1,2, YE Ying2, JI Shan shan2, YANG shuai jie2 (1. Department of Geography, East China Normal University, Shanghai 200062, China; 2. Department of Earth Science, Zhejiang University, Hangzhou 310027, China)  
Many industrial processes such as tanning, galvanization, spin, papermaking, and printing and dyeing cause Cr contamination. Exposure to Cr(Ⅵ) compounds causes skin ulcerations, irritative dermatitum and bronchial carcinomas. Great efforts have been focused on identified minerals that might removal chromium from aqueous. Therefore, adsorption of chromium (Ⅵ) on Mg/Al layered double oxides (Mg/Al LDOs) was studied in laboratory. Mg/Al layered double hydroxides (Mg/Al LDHs) are a group of synthetic clayish minerals with layered structure, in which the basic Me O OH layers are interstratified with anion layers. Mg/Al LDOs obtained by calcination of Mg/Al LDHs at about 500 ℃, adsorb anions from water through the reconstruction of their layered structure. It is demonstrated that the Mg/Al LDOs exhibit interesting adsorption properties removing , and LDOs could be a new type of environmental adsorbent for aqueous in contaminated ecosystems. The results indicate that the adsorption of via rehydration in LDOs is much bigger in amount than in LDHs in which the adsorption occurs through ion exchange. The process of adsorption by Mg/Al LDOs mainly occurred within 0~3 h, and then attended to Elovich Equation and the two constant rate equation. Adsorption isotherms could be both fitted to the Langmuir equation and Freundlich equation. However, the Langmuir equation is more favored. The average Cr(Ⅵ) amount adsorbed by Mg/Al LDOs is about 64.2 mg/g, a little lower than the theoretical anion exchange capacity (74.83 mg/g) calculated from the Langmuir equation, but much lower than the maximal formula anion exchange capacity of Mg/Al LDOs (301.6 mg/g). This is most probably caused by the competitive adsorption of from the solution. The percentage of Cr(Ⅵ) removal can reach above 99%with appropriate amount of adsorbent, and therefore, MgAl LDOs is a successful adsorbent to remove Cr (Ⅵ) in aqueous solution.
【Fund】: “十五”国家重点基础研究发展规划项目(G2000078503)
【CateGory Index】: X703
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