Synergy between dual Z-scheme heterostructured Vo-Bi2WO6/Bi2S3/Ag2S@Chitosan for the effective degradation of fuchsin basic dye
Kusum Sharma, Sonu Sonu, Pardeep Singh, Tansir Ahamad, Savaş Kaya, Konstantin P. Katin, Naveen Kumar, Archana Singh, Chaudhery Mustansar Hussain, Pankaj Raizada
Abstract
Background The current work investigates fuchsin basic photodegradation with visible light assistance as a potential solution for water contamination. The main goal is to modify the optoelectronic characteristic properties of Bi 2 WO 6 through oxygen vacancy generation (OVs) and forming dual Z-scheme heterojunction with Ag 2 S and Bi 2 S 3 . Methods The oxygen vacancy induced Bi 2 WO 6 /Ag 2 S/Bi 2 S 3 chitosan supported heterojunction system provided directional charge transfer channels with remarkable degradation efficacy of 99.80 % within 80 min. The dual Z-scheme heterojunction was fabricated using combined hydrothermal, co-precipitation and ultrasonic dispersion method. The Vo-Bi 2 WO 6 /Ag 2 S/Bi 2 S 3 @chitosan system followed pseudo-first-order kinetics for FB degradation at 0.0552 min -1 rate constant which is comparatively higher to bare counterparts. Significant findings The Vo-Bi 2 WO 6 /Ag 2 S/Bi 2 S 3 @Chitosan system possessed 99.80 % degradation for FB, whereas the Vo-Bi 2 WO 6 /Ag 2 S/Bi 2 S 3 , Vo-Bi 2 WO 6 /Ag 2 S, Vo-Bi 2 WO 6 , Bi 2 WO 6 , Ag 2 S, Bi 2 S 3 possessed (96.08 %), (64.69 %), (39.64 %), (32.64 %), (23.49 %), (28.14 %), degradation rate for FB in 80 min. The density functional theory (DFT) investigations provided information on the energy bandgap analysis and structural configuration of the bare photocatalysts, which aligns well with the experimental results. Also, LC-MS analysis was employed to scrutinize the degraded products whilst, quenching experiment, and EPR results explicated the dual Z-scheme charge transfer mechanism. This work advances the rationally of designing oxygen vacancy-mediated dual Z-scheme system, which may have consequences for mitigating water pollution issues.