改性高分子多糖去除重金属离子研究进展

高分子多糖如壳聚糖、果胶、淀粉、纤维素等因本身结构的特殊性和分子内活性基团的多样性,以及具备来源丰富、价格低廉、无毒、易于生物降解、无二次污染等多种优点,在废水中重金属离子去除方面受到了国内外越来越多研究者的关注,是环境友好型且有良好发展前景的水处理剂.因此对其进行物理和化学改性来提高去除效率和扩大应用范围成为必要手段.综述国内外对壳聚糖、果胶、淀粉、纤维素四种高分子多糖的改性方法,评述其改性产物对重金属离子的去除效果和作用机理,并探讨了今后的研究中值得关注的方向.

Progress of Research on Removing Heavy Metal Ions by Modified Polysaccharide

Polysaccharides including chitosan,pectin,starch and cellulose,as a result of the special nature of their structure and molecular diversity of the active groups,and many advantages of rich in source,inexpensive,non-toxic,easy to be biodegraded,no secondary pollution and so on,have attracted great consideration for its application to heavy metal ions removing in wastewater.These modified polysaccharides are environmentally friendly and promising wastewater treatment a-gents.Therefore,to improve the removal efficiency and to expand its application range,it is an es-sential method to modify its physical and chemical properties of the natural polysaccharides.The progress on the main modification methods of the chitosan,pectin,starch and cellulose,removing heavy metal ions by their modified products and mechanisms are reviewed and the research direc-tion worthy of concern in the future is discussed.