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Strategic Study of CAE >> 2014, Volume 16, Issue 7

Adsorption kinetics and rejection characteristics of phthalic acid esters in NF membrane

1. School of Environmental Science and Engineering,Zhejiang Gongshang Universiry,Hangzhou 310018, China;

2. National Engineering Research Center of Urban Water Resources,R&D Base in Zhejiang,Hangzhou 310012,China;

3. Department of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China

Funding project:浙江省重大科技专项(2009C03006-2);国家自然科学基金重点项目(51238006) Received: 2014-05-05 Available online: 2014-08-12 14:32:53.000

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Abstract

The removal of trace phthalic acid esters (PAEs) in water used DK nanofiltration membrane has been investigated. The adsorption behavior and rejection characteristics of dimethyl phthalate (DMP)、 diethyl phthalate (DEP)、di-n-butyl phthalate (DnBP) and di-iso-butyl phthalate (DiBP) were also explored. It was found that adsorption isotherms of PAEs in DK nanofiltration membrane fit the Freundlich adsorption equation well. The rejection characteristics of PAEs involved in the retention of adsorption and the retention of membrane pore before adsorption reaches saturation. After adsorption reaches saturation, the rejection mechanisms of PAEs could be described pore model,and rejection rate (R) of DMP、DEP、DnBP and DiBP were 55.1%、78%、96%、96.8% (0.5MPa,30℃,PAEs concentration 300μg/L), respectively. The results indicated that the trace DnBP 、DiBP in water could been rejected very effectively by DK nanofiltration membrane.

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