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由于汞的物理化学性质和对人体的毒副作用,汞减排已成为全球共识。当前除汞方法中,吸附法为一种较有潜力的方法。壳聚糖是一种天然的汞离子(Hg~(2+))吸附剂,以物理、化学手段改性后的衍生物更具有对环境中的汞吸附容量大,吸附效率高的优点。本文综述了壳聚糖及其衍生物脱除溶液中Hg~(2+)的研究近况,介绍了壳聚糖物理(冷冻干燥、静电纺丝等)、化学修饰手段(交联和接枝等)以及与新型碳材料(碳纳米管、氧化石墨烯等)复合脱汞的最新研究,分析了壳聚糖及其复合物对水中Hg~(2+)的去除效果和影响因素。最后,对壳聚糖吸附剂在汞污染治理中的研究作了展望。
Due to the physicochemical properties of mercury and the toxic side effects on human beings, mercury emission reduction has become a global consensus. In the current mercury removal method, the adsorption method is a potential method. Chitosan is a kind of natural mercury ion (Hg2 +) adsorbent. It has the advantage of large mercury adsorption capacity and high adsorption efficiency in physical and chemical modified derivatives. In this paper, the recent progress in the removal of Hg 2+ from chitosan and its derivatives is reviewed. Chitosan physics (freeze-drying, electrospinning, etc.), chemical modification methods such as crosslinking and grafting ), And new carbon materials (carbon nanotubes, graphene oxide, etc.) were studied. The removal effect and influencing factors of Hg ~ (2+) in water by chitosan and its complexes were analyzed. Finally, the prospect of chitosan adsorbent in mercury pollution control is prospected.