介绍了壳聚糖的基本结构与性质,其结构中的官能团自由基与化学键能够与重金属离子进行配位螯合,其丰富的羟基和氨基等基团对重金属离子具有较强的吸附效果,可作为低成本吸附剂。但未改性的壳聚糖吸附能力较低,在进行化学改性后壳聚糖表面的活性基团增多,其对金属离子的吸附效果显著提高,主要从交联改性、接枝改性、离子印迹法、复合改性等几种壳聚糖化学改性方法综述了近年来化学改性壳聚糖吸附水中重金属的研究进展。
The basic structure and properties of chitosan are introduced.The functional free radicals and chemical bonds in its structure can coordinate and chelate with heavy metal ions.Its rich hydroxyl and amino groups have strong adsorption effect toward heavy metal ionsand can be used as a low-cost adsorbent.However,the adsorption capacity of unmodified chitosan is low.After chemical modification,the active groups on the surface of chitosan increase,and its adsorption effect toward metal ions is significantly improved.The research progress of chemically modified chitosan for adsorbing heavy metals in water in recent years is reviewed from several chemical modification methods of chitosan,such as crosslinking modification,grafting modification,ion imprinting and composite modification.
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基金资助
国家自然科学基金(51768018)
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