Constructing a visible-light-driven photocatalytic membrane by g-C(3)N(4) quantum dots and TiO(2) nanotube array for enhanced water treatment

Photocatalytic membranes that driven by visible light are highly desired for water treatment. Here g-C(3)N(4) quantum dots (QDs) assembled into TiO(2) nanotube array (TNA) membranes were fabricated for the first time as a visible-light-driven g-C(3)N(4)/TNA membrane. Benefiting from the synergistic effect of membrane filtration and photocatalysis, more than 60% of rhodamine B could be removed from water under visible light irradiation. Meanwhile, the g-C(3)N(4)/TNA membrane presented an enhanced anti-fouling ability during filtering water containing Escherichia coli under visible light irradiation, and a permeate flux of 2 times higher than that of filtration alone was obtained by integrated process. This study offers a promising strategy for the potential application of the visible-light-driven membranes in water treatment.