Simulated sunlight photodegradation of aqueous atrazine and rhodamine B catalyzed by the ordered mesoporous graphene-titania/silica composite material

摘要

Ordered mesoporous graphene-titania/silica composite material was prepared using a direct sol-gel co-condensation technique, and combined with hydrothermal treatment, in the presence of a triblock copolymer non-ionic surfactant P123 (EO_(20)PO_(70)EO_(20), EO= -OCH2CH2-, P0= -OCH(CH3)CH2-). The composite exhibited a two-dimensional (2D) hexagonal p6mm symmetry and anatase-phase structure with a large BET (Brunauer-Emmet-Teller) surface area and uniform pore size. The photocatalytic activity of the graphene-titania/silica composite was evaluated through the degradation of the aqueous organic pollutant atrazine and rhodamine B under solar-simulating Xe lamp irradiation. Enhanced photocatalytic activity compared with pure titania was obtained for the graphene-titania/silica sample.