A new adsorbent for heavy metal ions, cys‐chitin, was produced by modifying chitin in THF with L‐cysteine in the presence of sulfuric acid as a catalyst. Its structure was confirmed by elemental analysis and FTIR spectra analysis. The adsorption properties of cys‐chitin for CuII, CdII, PbII, ZnII, and NiII were investigated. The effect of pH value on adsorption and adsorption kinetics was examined. The results indicate that the cys‐chitin has much better adsorption for CdII, PbII, and ZnII than chitin itself. The adsorption capacities of cys‐chitin for CdII, PbII, and ZnII were 214.6, 351.5, and 107.0 mg/g, respectively. It also had good adsorption properties for heavy metal ions. The adsorption capacities were also affected by the acidity of medium. The adsorbed CdII, PbII could be eluted by diluted nitric acid.
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Shao et al. (2003) studied this question.
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