Natural polysaccharides, derived from biomass feedstocks, marine resources, and microorganisms, have been attracting considerable attention as benign and environmentally friendly substitutes for synthetic polymeric products. Besides many other applications, these biopolymers are rapidly emerging as viable alternatives to harmful synthetic flocculating agents for the removal of contaminants from water and wastewater. In recent years, a great deal of effort has been devoted to improve the production and performance of polysaccharide bio-based flocculants. In this review, current trends in preparation and chemical modification of polysaccharide bio-based flocculants and their flocculation performance are discussed. Aspects including mechanisms of flocculation, biosynthesis, classification, purification and characterization, chemical modification, the effect of physicochemical factors on flocculating activity, and recent applications of polysaccharide bio-based flocculants are summarized and presented.

源自生物质原料，海洋资源和微生物的天然多糖作为合成聚合物产品的良性和环保替代品已引起了广泛关注。除许多其他应用外，这些生物聚合物正在迅速成为有害合成絮凝剂的可行替代品，用于去除水和废水中的污染物。近年来，为改善多糖生物基絮凝剂的生产和性能付出了巨大的努力。在这篇综述中，讨论了多糖生物基絮凝剂的制备和化学改性的当前趋势及其絮凝性能。各个方面包括絮凝机制，生物合成，分类，纯化和表征，化学修饰，