An Efficient TiO2/rGO Hybrids with Enhanced Photocatalytic Degradation Toward Reactive Red 195

A common azo dye, Reactive Red 195 (RR195), is widely used in the printing and dyeing industry. Due to the complicated composition of RR195, how to degrade it has aroused great interest from researchers. The extensive use of RR195 caused environmental pollution and irreversible recovery. More important, few reports have been made to investigate the degradation of RR195, especially intrinsic mechanism. Herein, we present a facile strategy for the synthesis of reduced graphene oxide-supported biphasic titanium dioxide (B-TiO2/rGO). Benefiting from high conductivity and specific surface area provided by rGO, the recombination efficiency of photoinduced electron-hole pairs stemming from TiO2 is significantly suppressed, and broadening the photoreaction range of TiO2, leading to more stable photocatalytic performance for RR195. The degradation efficiency of RR195 by using B-TiO2/rGO could reach 99% at neutral solution. This work provides a new insight to rational design high-effiency photocatalysts that hopefully applied to pratical industrial manufacture.

Automated summary

In this study, a facile strategy for the synthesis of B-TiO2/rGO was proposed, which showed high efficiency in the photocatalytic degradation of RR195. By utilizing the high conductivity and specific surface area provided by rGO, the photoreaction range of TiO2 was broadened, leading to a stable degradation efficiency for RR195.