Self-assembly TiO2-RGO/LDHs nanocomposite: Photocatalysis of VOCs degradation in simulation air

In this work, the TiO 2 -RGO/LDHs photocatalyst was synthesized by a hydrothermal method using GO/LDHs as substrates. The structure and property of prepared materials were characterized via XRD, SEM, EDS, XPS, TEM, UV–vis spectroscopy, etc. Toluene, methanol, and ethyl acetate were selected as typical volatile organic pollutants model pollutants to examine the photocatalytic degradation effect of TiO 2 -RGO/LDHs. The photocatalytic efficiency of the TiO 2 -RGO/LDHs system was further investigated in contaminated air (NOx = 20 ppm). The results indicated that the prepared TiO 2 -RGO/LDHs nanocomposite possess better photodegradation activity than pure TiO 2 and TiO 2 -RGO samples, and the photocatalyst has excellent application for the elimination of three kinds of VOCs. The photochemical and materials characterization revealed that the graphene has enlarged the light response range and inhibited the recombination of electron-hole pairs of TiO 2 . Meanwhile, LDHs can offer more hydroxide ions to accelerate the oxidation reaction, resulting in more radicals and better pollutants degradation.