文献类型：期刊文献

英文题名：Effect of aluminum and manganese ions on the chlorination of polyamide membranes

作者：Yang, Linyan[1,2,3];Wang, Jinrui[3];Chen, Xueming[4];Yuan, Cheng[3];Bai, Lichun[5];Meng, Shujuan[6];Cao, Guomin[1,2,3]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[3]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[4]Fuzhou Univ, Coll Environm & Resources, Fujian Prov Engn Res Ctr Rural Waste Recycling Tec, Fuzhou 350116, Fujian, Peoples R China;[5]Cent South Univ, Sch Traff & Transportat Engn, Key Lab Traff Safety Track, Minist Educ, Changsha 410075, Peoples R China;[6]Beihang Univ, Sch Space & Environm, Beijing 100191, Peoples R China

年份：2023

卷号：567

外文期刊名：DESALINATION

收录：;EI(收录号：20233814746650);WOS:【SCI-EXPANDED(收录号:WOS:001149998600001)】；

基金：This study was sponsored by National Key Research and Develop-ment Program (2019YFC0408202) , National Natural Science Founda-tion of China (No. 52100085) , and Natural Science Foundation of Shanghai (21ZR1418000) .

语种：英文

外文关键词：Polyamide membrane; Aluminum ions; Manganese ions; Chlorination; Chlorination-promoted hydrolysis

摘要：The deterioration of separation performance of polyamide membranes after chlorine exposure is a core issue in the application process of membrane technology. The co-existence of metal ions (i.e., Al3+ and Mn2+), which are ubiquitous in different types of water bodies, may complicate the chlorination process. This study systematically evaluated membrane degradation under the simultaneous presence of free chlorine and Al3+ or Mn2+. The membrane water flux after chlorine exposure of 2400 mg/L & sdot;h was decreased by 70 %, of which 49 % was resulted from chlorine exposure, attributing to competing effects of the decreased hydrophilicity (contact angle increased from 56 degrees to 68 degrees) and cross-linking degree (Onet/N ratio increased from 1.1 to 2.3). The changes in the physiochemical properties of membranes were due to chlorination and hydrolysis induced by chlorination. The addition of Al3+ or Mn2+ to chlorine resulted in a further reduction of 8 %-13 % for water flux, and a variation as high as 21 % (increase) and 15 % (decrease) for salt rejection compared to virgin membrane at different exposure periods. These cations similarly resulted in a more hydrophobic membrane surface with varied surface charge and the formation of deposition layers. In addition, Al3+ and Mn2+ did not affect chlorination degree (chlorine incorporation). However, Al3+ promoted chlorination-promoted hydrolysis, while Mn2+ inhibited, reflected by the opposite trends of Onet/N.