低浓度NaClO和NaOH对聚偏氟乙烯超滤膜老化的影响

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Abstract The polyvinylidene (PVDF) ultrafiltration membrane was aged using NaClO and NaOH. The selected concentrations of the agents were 0.026mol/L and 0.025mol/L, respectively. The effect of low-concentration cleaning agents on the aging of the PVDF membrane was investigated. The virgin membrane and membranes exposed to cleaning agents were characterized using pure water flux, membrane pore size distribution, total organic carbon (TOC) rejection efficiency, tensile strength, field emission scanning electron microscopy (FESEM), contact angle and attenuated total reflectance fourier transform infrared spectroscopy (ATR-FTIR). The results indicated that the average pore size of the membrane exposed to cleaning agents increased than that of the virgin membrane. After exposed to NaClO and NaOH, the total organic carbon (TOC) rejection efficiencies decreased from 36.0% to 16.2%~32.4% and13.9%~24.4%, respectively. The dehydrofluorination occurred during the aging process, which was indicated by the increased peak intensity of C=C and C=O. The chemical composition and structure of the membrane were changed by the chemical cleaning agents and this caused the reduction of membrane hydrophilicity. The tensile strength and ultimate elongation reduced along with the increased aging time. The impact of NaOH on the mechanical property of membrane was more significant than that of NaClO.

Key words： ultrafiltration membrane aging chemical cleaning agent membrane pore size mechanical property

Received: 22 April 2016

PACS:

X703

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	Articles by authors
	LIU Jing-yan
	LU Xiao-yan
	ZHU Yan-ru
	XU shi-rong
	MA Jun
	ZHANG Jin-song
	GUO Jian-ning

Cite this article:

LIU Jing-yan,LU Xiao-yan,ZHU Yan-ru等. Effect of NaClO and NaOH at low agent concentration on the ageing of PVDF ultrafiltration membrane[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(2): 606-612.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I2/606

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