GO-TiO<sub>2</sub>改性PVDF复合膜去除微污染水体中氨氮

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Abstract

The polyvinylidene fluoride (PVDF) microfiltration membrane was modified by vacuum filtration method with graphene oxide (GO), titanium dioxide (TiO₂) and graphene oxide-titanium dioxide (GO-TiO₂) as modifiers. The structure and hydrophilicity of the composite membranes were investigated by contact angle measurement, scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). At the same time, humic acid (HA) was selected as the representative of micro-pollutants in water to examine the anti-pollution performance of the composite membrane. The removal efficiencies of ammonia nitrogen by composite membrane under dark and ultraviolet light conditions were studied by using the lake water samples from Gehu Lake branch in Changzhou as raw water. The results showed that GO, TiO₂ and GO-TiO₂ (GT) composite membranes had better hydrophilicity and anti-pollution performance than PVDF membranes. Under dark condition, GO composite membrane with GO concentration of 1mg/ml had the highest ammonia nitrogen removal rate (26.4%) under dark condition, while that of GT composite membrane with GO-TiO₂ concentration of 1mg/mL and GO/TiO₂=3:1could reach the best (58.2%), for there was synergistic effect between GO and titanium dioxide under ultraviolet light.

Key words： graphene oxide composite membrane photocatalysis ammonia nitrogen

Received: 09 November 2018

PACS:

X524

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	Articles by authors
	ZHANG Zhi-wei
	XU Bin
	ZHANG Yi-min
	YANG Fei
	KONG Ming
	ZHU Yue-ming
	GU Shi-yun
	GUAN Xiang-yang

Cite this article:

ZHANG Zhi-wei,XU Bin,ZHANG Yi-min等. Removal of ammonia nitrogen from micro-polluted water by GO-TiO₂ modified PVDF composite membrane[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(6): 2395-2401.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I6/2395

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