文献类型：期刊文献

英文题名：Surface modification of FO membrane for improving ammoniacal nitrogen (NH4+-N) rejection: Investigating the factors influencing NH4+-N rejection

作者：Yao, Xuesong[1,2];Gonzales, Ralph Rolly[1];Sasaki, Yuji[1];Lin, Yuqing[3];Shen, Qin[1,2];Zhang, Pengfei[1,2];Shintani, Takuji[1,4];Nakagawa, Keizo[1,4];Matsuyama, Hideto[1,2]

机构：[1]Kobe Univ, Res Ctr Membrane & Film Technol, 1-1 Rokkodai,Nada Ku, Kobe, Hyogo 6578501, Japan;[2]Kobe Univ, Dept Chem Sci & Engn, 1-1 Rokkodai,Nada Ku, Kobe, Hyogo 6578501, Japan;[3]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[4]Kobe Univ, Grad Sch Sci Technol & Innovat, 1-1 Rokkodai,Nada Ku, Kobe, Hyogo 6578501, Japan

年份：2022

卷号：650

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20221111774048);WOS:【SCI-EXPANDED(收录号:WOS:000784584400002)】；

基金：A part of this study was supported by the project (JPNP14004) commissioned by the New Energy and Industrial Technology Development Organization (NEDO). Other part of this study was supported by the project (JPNP18016) commissioned by the New Energy and Industrial Technology Development Organization (NEDO).

语种：英文

外文关键词：Forward osmosis; Thin-film composite membrane; Ammoniacal nitrogen concentration; Carboxylic group density; Surface grafting

摘要：Forward osmosis (FO) has attracted attention for wastewater treatment owing to its energy-saving characteristics; however, the low rejection of ammoniacal nitrogen (NH4(+)-N) for normal polyamide thin-film composite (TFC) FO membranes limits their practical applications for NH4(+)-N recovery or concentration from wastewater. Herein, ethylenediamine (EDA)-and 2-aminoethanol (AEA)-grafted TFC FO membranes were prepared to improve the NH4(+)-N rejection. EDA and AEA have similar molecular structures; however, their end groups differ. EDA has two primary amino groups, whereas AEA has one amino group and one hydroxy group. Both EDA-and AEA-grafted FO membranes significantly improved the NH4+-N rejection, and a further increase in NH4(+)-N rejection was noted (up to 97.5%) with increasing grafting times. These membranes showed high rejection, even at a feed solution with higher pH of 7.6 (89.7% and 83.0% for EDA-and AEA-grafted membranes, respectively). The carboxylic group density of the pristine and grafted membranes was measured to investigate the factors influencing the improvement in NH4(+)-N rejection. A significant correlation was found between the carboxylic group density and NH4(+)-N rejection, while the correlation between the surface zeta potential and NH4(+)-N rejection was unclear. This means not only positive charge chemical grafting can improve the NH4(+)-N rejection, but also the neutral chemical grafting can improve the NH4(+)-N rejection. It also indicates that reducing membrane surface carboxylic group density could alleviate cation exchange during FO process. This study clarified the factors influencing NH4(+)-N rejection and provided a novel idea for designing a FO membrane with high NH4(+)-N selectivity suitable for ammoniacal nitrogen concentration from wastewater.