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Research progress of low-cost sorbents for treating heavy metal ions in wastewater

Li Zengxin Xue Shuyun (Department of Chemistry,Teachers College of Qingdao University,Qingdao 266071)  
The technical feasibility of various low-cost sorbents for heavy metal removal from wastewater has been reviewed.The use of low-cost sorbents have been investigated as replacements of current costly methods for removing heavy metals from contaminated water.Natural materials with a high sorption capacity for heavy metals can be obtained,employed and disposed of with little cost.Modification of the sorbents can also improve adsorption capacity.A wide range of potentially low-cost sorbents,including chitosan,bentonite,sepiolite,algae,peat and so on are introduced.Some of the highest adsorption capacities reported for cadmium,chromium,lead and mercury are: 796 mg Pb/g chitosan,1123 mg Hg/g chitosan,92 mg Cr(Ⅲ)/g chitosan,76 mg Cr(Ⅲ)/g peat,41 mg Pb/g bentonite,558 mg Cd/g chitosan,and 215 mg(Cd/g) seaweed.The low-cost sorbents have many advantages in disposal of heavy metals in wastewater,which will be applied widely in future.
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