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.
关键词
石墨相氮化碳/光催化/复合膜/罗丹明B
Key words
graphite phase carbon nitride/photocatalysis/composite membrane/Rhodamine B