Construction of direct Z-scheme g-C3N4/BiYWO6 heterojunction photocatalyst with enhanced visible light activity towards the degradation of methylene blue

Abstract

Construction of the Z-scheme heterojunction photocatalyst achieved highly improved photocatalytic ability by its high redox ability of the photoinduced e − -h + pairs. In the study, Z-scheme g-C 3 N 4 /BiYWO 6 heterojunction photocatalyst is prepared by the single step hydrothermal method. Further, its photocatalytic ability was assessed by degrading methylene blue under visible light exposure. Particularly, the optimized 30 wt. % of g-C 3 N 4 in the g-C 3 N 4 /BiYWO 6 composite exposes almost complete degradation after 90 min, that is ~ 3.0 times greater than the bare BiYWO 6 and g-C 3 N 4 with the rate constant value 0.032 min − 1 . Experimentally, the radical trapping studies indicates O 2 . − and .OH radicals are playing vital role in the photocatalytic degradation process. Also, Z-scheme g-C 3 N 4 /BiYWO 6 heterojunction photocatalyst exhibits excellent photoelectrochemical property and it is stable after three cycles, which indicates its good reusability nature. These enhancements are due to the newly formed heterostructure that facilitates the migration and separation e ciency of the photoproduced e − -h + pairs. Hence, the synthesized Z-scheme g-C 3 N 4 /BiYWO 6 heterostructure could be an excellent material for wastewater remediation works.

A Hybrid S‐Scheme WS2/BiOI Heterojunction Photocatalyst for Wastewater Treatment

“…As a result, the E CB potentials of pure WS 2 and BiOI are −0.418 and 0.541 eV, respectively. The flat band potentials of pure BiOI and WS 2 were governed by the following Equation 3: [34–37] $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {\rm E}({\rm RHE})={\rm E}({\rm Ag}/{\rm AgC1})+{\rm E}({\rm Ag}/{\rm AgCl})+0.059\mskip4mu {\rm pH}\hfill\cr}}$$$ …”

“…As a result, the E CB potentials of pure WS 2 and BiOI are À 0.418 and 0.541 eV, respectively. The flat band potentials of pure BiOI and WS 2 were governed by the following Equation ( 3): [34][35][36][37] EðRHEÞ ¼ EðAg=AgC1Þ þ EðAg=AgClÞ þ 0:059 pH (3)…”

Bismuth-Based Z-Scheme Heterojunction Photocatalysts for Remediation of Contaminated Water

“…Furthermore, BBSc Z-scheme heterojunction photocatalysts for the removal of organic dye pollutants are summarized in Table . Based on several report studies, − it is evident that Bi-based Z- scheme heterojunctions hold great promise for the efficient degradation of dyes in wastewater treatment processes, offering a feasible solution to address the environmental concerns associated with dye pollution. The utilization of Bi-based Z-scheme heterojunctions has shown great potential in the degradation of dyes, with significantly improved photocatalytic performance and higher degradation efficiency compared to single component photocatalysts …”

“…125 Furthermore, the optimized composition of g-C 3 N 4 /BiYWO 6 heterojunction photocatalysts has shown significant improvement in the degradation of methylene blue under visible light exposure, indicating its potential for wastewater remediation works. 126 Furthermore, Zhong and his colleagues utilized a In another study reported by Hao et al a ternary Z-scheme heterojunction of WO 3 /Ag 3 PO 4 /Bi 2 WO 6 photocatalyst was fabricated via a one-pot hydrothermal method for degradation RhB. 128 The result shows that, the Z-scheme heterojunction photocatalysts were shown an outstanding photocatalytic degradation rate constant of 1.9 and 1.3 times higher than that of pure Bi 2 WO 6 and WO 3 −Bi 2 WO 6 photocatalysts, respectively.…”

“…The 1:1 ratio of Bi 2 O 3 /g-C 3 N 4 heterojunction photocatalyst performs highest photocatalytic degradation of 91.2% after 120 min of visible-light irradiation . Furthermore, the optimized composition of g-C 3 N 4 /BiYWO 6 heterojunction photocatalysts has shown significant improvement in the degradation of methylene blue under visible light exposure, indicating its potential for wastewater remediation works . Furthermore, Zhong and his colleagues utilized a simple hydrothermal process to synthesize heterojunction composites of BiVO 4 @g-C 3 N 4 (100).…”