| Abstract:Heavy metal pollution in general contain lead, mercury, cadmium, arsenic and other heavy metals in biological toxicity and its compounds to the environment caused by pollution. Heavy metal pollution comes mainly from human production and life wastewater discharges, waste, waste gas. A wide variety of heavy metal pollutants and easy to enrichment of its own, and the compound is difficult to be degraded, and has a wide distribution area, difficult to control, harm and persistent. Currently, the treatment of heavy metal chemical precipitation, ion exchange, adsorption and membrane separation. In recent years, numerous research classification based on the above-described method, but not yet to breakthrough the bottleneck of utilization is low, poor selectivity, high cost, the treatment effect is not ideal.This paper discusses the kaolin, chitosan, bentonite, ZSM-5, activated carbon, cation exchange resin, hurnic acid and its resin on Pb2+、Cu2+、Cd2+、As3+adsorption performance.Trial found:kaolin, activated carbon, bentonite and chitosan poor adsorption properties of the investigated metal ions; ZSM-5adsoiption properties of a single ion, alkali resistance, for various ions coexist case of selective than; humic acid has a strong adsorption capacity, but the high impurity content, could easily lead to water swelling water-blocking, and their own strength, difficult to separate. Therefore, the test is to take the humic acid was purified, and then add the specific binder granulated molding. Modified humic acid has good adsorption of Pb2+、Cu2+、Cd2+、As3+, it also has good strength and applicability,the adsorption were15.33mg/g、11.87mg/g、7.54mg/g、3.35mg/g, has good industrial application prospect. |
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