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用非均一法碱处理制得脱乙酰度75％的甲壳素,对有毒及放射性金属离子在不同pH条件下进行了吸附实验,结果表明,Cd~(2+)、Pb~(2+)、U~(6+)、Th~(4+)的吸附率与介质pH有关。在pH=3—5时,吸附率较低;在pH≥7时,除Pb~(2+)的吸附率略低外,其余三种离子的吸附率均达90％以上,因此在此条件下用非均一法制得的甲壳素富集、分离有毒及放射性金属离子能收到较好的效果,用于上述离子的废水处理有一定的实用意义。
The chitin with deacetylation degree of 75% was obtained by non-uniform alkali treatment. The adsorption experiments of toxic and radioactive metal ions under different pH conditions showed that Cd 2+, Pb 2+, The adsorption rates of U ~ (6 +) and Th ~ (4+) are related to the pH of the medium. At pH = 3-5, the adsorption rate is low; at pH≥7, the adsorption rates of all the three ions are above 90%, except that the adsorption rate of Pb 2+ is slightly lower. Therefore, Chitin enrichment by non-uniform method, separation of toxic and radioactive metal ions can receive good results, for the above-mentioned wastewater treatment of ions have some practical significance.