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《Journal of Safety and Environment》 2003-06
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STUDY ON ABSORPTION OF 2,4-DICHLOROPHENOL WITH MODIFIED ZEOLITES

WEI Xiang, ZHU Kun, WANG Hai-tao, YANG Jian-tao, MA Juan (College of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)  
The present article aims to introducing the author's method of modifying zeolites by placing hexade-cyltrimethylammonuium bromide (HDTMAB) surfactants. With the effects of HDTMAB quantity added, the author has investigat- ed in detail the initial concentration of 2,4-dichlorophenol (2,4-DCP) and the optimal conditions which may influence the properties for modified zeolites on adsorbing the organic contaminant 2,4-DCP. As is known, though the removal efficiency of 2,4-DCP can be properly improved by increasing the initial concentration of 2,4-DCP and the concentration of HDTMAB to modify zeolites, there is still an economical concentration of 15 g·L-1. The author's experimental result shows that removal efficiency gained from the aqueous solutions can be over 90%. Since pH values play a critical role in the absorption mechanism of 2,4-DCP on modified zeolites due to the existence of 2,4-DCP in aqueous solution and the sorption increased at a pH may range from 4 to 10, the sorption isotherms curves of 2,4-DCP on modified zeolites can be obtained and prove to agreed to Freundlich-Equation.
【Fund】: 国家自然科学基金资助项目(编号:29977015)
【CateGory Index】: X132
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