通过简单的高温工艺合成了金属掺杂(Cu、Mg、Al、Ca)g-C₃N₄,再将一维材料纳米纤维素(CNF-C)插入二维材料 g-C₃N₄中,采用真空辅助抽滤法制备得到光催化复合膜,通过XRD、SEM、FT-IR、UV-Vis DRS对所制备的g-C₃N₄/CNF-C复合膜的微观结构、化学组成和理化性质进行表征。结果表明,金属掺杂光催化剂的可见光催化活性得到改善,有利于污染物降解,减少了带隙,延长了可见光吸收;掺杂Cu的g-C₃N₄制备的复合膜对罗丹明B染料的降解表现出最高的光催化性能,7 h降解率达42.6%;掺杂Mg的g-C₃N₄的复合膜水通量约为未掺杂g-C₃N₄的3倍,达到了918.63 L/(h·m²·bar)。

Metal-doped (Cu,Mg,Al,Ca) g-C₃N₄ is synthesized via a simple high-temperature process,and then one-dimensional nanofibrillar cellulose (CNF-C) is inserted into two-dimensional g-C₃N₄,and finally photocatalytic composite membranes are prepared through vacuum-assisted filtration method.XRD,SEM,FT-IR,and UV-Vis DRS are employed to systematically characterize the microstructure,chemical composition and physicochemical properties of the designed g-C₃N₄/CNF-C composite membrane.Results show that the visible photocatalytic activity of the metal-doped photocatalyst is improved,which favoring pollutant degradation,reducing the band gap and prolonging the visible light absorption.In particular,Cu-doped g-C₃N₄ composite membrane shows the highest photocatalytic performance for the degradation of Rhodamine B dye,delivering a degradation rate of 42.6% in 7 h.The water flux of Mg-doped g-C₃N₄ composite membrane is around three times that of the undoped g-C₃N₄,which reaches 918.63 L·h^-1·m^-2·bar^-1.

何潇潇(1999-),女,硕士生,研究方向为光催化材料,1723461629@qq.com;王莉玮(1973-),女,博士,教授,研究方向为功能光催化材料、复合材料,通讯联系人,wlw@mju.edu.cn。