吸附
壳聚糖
吸附剂
水溶液
化学
无机化学
铜
水溶液中的金属离子
化学吸附
离子
核化学
吸附
有机化学
作者
Т. Е. Никифорова,В. А. Козлов,Felix Y. Telegin
标识
DOI:10.1016/j.mseb.2020.114778
摘要
Sorption of copper ions by composite sorbents based on cross-linked chitosan such as chitosan/colloid silicon dioxide, chitosan/polymethylsiloxane and chitosan/ polymethylsiloxane/gelatin have been studied. Sorption capacity of the sorbents is increased the pristine chitosan 1.5–3.85 times. Eliminating of Cu2+ is based on competing mechanism of salt formation between metal ions and amino-groups in a two-phase system "aqueous solution of acids and salts – chitosan", which involve metal ions (M2+), protons (H+) and their carriers – anions (X−) on the amino-groups of composite sorbent with final formation of chelates of the following structure CS[(-NH2)2M(X)2] and CS[-NH3X]2. The role of pH on sorption of copper ions and protons is explained by competing mechanism of metal cations and protons for sorption sites. Sorption of protons is accompanies by transformation of amino-groups into inactive form, H-form, which is resulted in decreasing the capacity of sorbents for ions of heavy metals in aqueous acidic solutions.
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