The Study Of The Efficiency For High-performance Sorbent To Sorb Micropollutants In Water

The performance and the application of the activated carbon, activated carbon fiber , chitosan , resin , zeolite and clay in removing micropollutants from water were reviewed in the paper, and the application prospects of these absorptive materials in water purification were discussed.A safe water purification sorbent based on chitosan was developed.The physical and chemical characteristics and the adsorbability removing micropollutants of the sorbent were studied.The adsorption and desorption behaviors of the sorbent to remove the CHCl3, CHBrCl2 and polar phenolic compounds from water were studied based on the adsorption and partition theories , the adsorption performance for the metal was studied and the influence of pH, temperature and dosage also were discussed.The result showed that single layer adsorption occurs when Ce<60 u g/L,while multiple layer adsorption occured when Ce>60ug/L. the competitive adsorption between CHCl3 and CHBrCl2 has been studied under multicomponent system.The desorption rate of CHCl3 and CHBrCl2 was very low.The pH value and temperature have little influence on the adsorption.The sorbent could adsorb 79.67% of CHCl3 and 87.66% of CHBrCl2 when the concentration of the sorbent was 1.67g/L.Freundlich isotherm and Langmuir isotherm were suggested as the appropriate types for phenol, 4-chlorophenoK 2,4-dichlorophenol and pentachlorophenol. The desorption rate of phenolic compounds was rather low.The high-performance sorbent could adsorb more than 90% of phenoK 4-chlorophenoK 2,4-dichlorophenol and pentachlorophenol when the pH range was found to be 6.5-8.5,and the optimum mass of the sorbent was 8g/L.The sorbent could adsorb 90.9% of Cd2+ ,97.4% of Cu2+ and 95.9% of Zn2+ when the dosage of the sorbent was 4g/L and the pH was 6.