Rejection of HA and antifouling performance with 3D GO-CNT composite membrane
LIU Zhong-tao1,2, GUO Zhen-hua1, HU Cheng-zhi2,3, MA Ying-li1, SUN Jing-qiu2,3
1. School of Energy and Environment Engineering, Hebei University of Technology, Tianjin 300401, China; 2. Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：GO-CNT three-dimensional composite membrane was fabricated in order to achieve a high water flux and to mitigate humic acid (HA) fouling. The results exhibited that GO-CNT membranes had a rougher surface than GO membrane. The CNTs were intercalated in GO lamellas uniformity, constituting a 3D network structure. GO-20%CNT membrane with the loading of 30μg/cm2 achieved a rejection of over 90% on HA, and its water flux was improved to 2times higher than that of GO membrane. In acidic condition, the size of HA increased due to molecular aggregation, and the surface negative charge decreased due to protonation. So the rejection of HA during filtration through GO-CNT composite membranes improved but water flux decreased. The compression of electric double layer caused by the increased ion strength declined the Donnan effect, the results showed that the HA rejection of GO-CNT composite membrane decreased from 90.2% to 31.9%. The pure water flux of 3D GO-CNT composite membrane was decreased by 10.95% after filtering HA for 1hour, and the flux recovery rate was 99.68% after washing for 1hour. The composite membrane exhibited an excellent antifouling performance with flux recovery rate of 6.18%, which was much higher than reported GO membrane.
刘中桃, 郭振华, 胡承志, 马影利, 孙境求. GO-CNT三维复合膜截留HA与抗污染性能[J]. 中国环境科学, 2017, 37(12): 4556-4563.
LIU Zhong-tao, GUO Zhen-hua, HU Cheng-zhi, MA Ying-li, SUN Jing-qiu. Rejection of HA and antifouling performance with 3D GO-CNT composite membrane. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(12): 4556-4563.
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