Removal of ammonia nitrogen from micro-polluted water by GO-TiO2 modified PVDF composite membrane
ZHANG Zhi-wei1,2, XU Bin2, ZHANG Yi-min2,1, YANG Fei2, KONG Ming2, ZHU Yue-ming2, GU Shi-yun1,2, GUAN Xiang-yang1,2
1. School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China;
2. Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China
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.
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