Enhancement of Visible-Light Photocatalysis by Coupling with Narrow-Band-Gap Semiconductor: A Case Study on Bi₂S₃/Bi₂WO₆

Abstract

To overcome the drawback of low photocatalytic efficiency brought by electron-hole recombination and narrow photoresponse range, we designed a novel Bi(2)S(3)/Bi(2)WO(6) composite photocatalyst. The composite possesses a wide photoabsorption until 800 nm, which occupies nearly the whole range of the visible light. Compared with bare Bi(2)WO(6), the Bi(2)S(3)/Bi(2)WO(6) composite exhibits significantly enhanced photocatalytic activity for phenol degradation under visible light irradiation. On the basis of the calculated energy band positions, the mechanism of enhanced photocatalytic activity was proposed. The present study provides a new strategy to design composite materials with enhanced photocatalytic performance.

Carbon Quantum Dots/Bi2WO6 Composites for Efficient Photocatalytic Pollutant Degradation and Hydrogen Evolution

“…4(c), the CQDs/Bi 2 WO 6 composite displays superior photocatalytic performance to pure Bi 2 WO 6 in the degradation of phenol, which can degrade 33.4% and 22.4% of phenol after 120 min of simulated solar light irradiation, respectively. The above results further con¯rm that CQDs are responsible for the enhanced photocatalytic activity of Bi 2 WO 6 .…”

“…8) Besides contaminant degradation, the CQDs/ Bi 2 WO 6 composite was also used for hydrogen generation from water splitting. The amount of hydrogen evolution versus time for pure Bi 2 WO 6 CQDs and the CQDs/Bi 2 WO 6 composite is shown in Fig. 9.…”

“…[5][6][7][8][9][10] Even so, two drawbacks of Bi 2 WO 6 have still restricted its practical application. One is that the absorption onset of bare Bi 2 WO 6 is located at ca.…”

Study of photocatalytic and antibacterial activities of graphene oxide nanosheets

“…In addition, GO provides high surface area as a catalyst thus facilitating the fast adsorption of O 2 molecules on surface. To estimate the rate constant of the reaction, the LangmuirHinshelwood model [39] has been used. According to this model, the rate of reaction can be obtained using…”

“…The results demonstrate that the TiO 2 /graphene oxide composite material has high photocatalytic activity with potential to be used in environment remediation [15]. Zhang et al (2012) developed an environmentally benign route to synthesize mono-dispersive anatase TiO 2 nanocrystals in organic solvent. The results demonstrate that the microfluidic reactor approach could provide the TiO 2 sol with a high uniformity of physical and chemical properties [16].…”