CuInS2-MgO/S-doped biochar heterojunction for the efficient adsorption-photocatalytic elimination of cationic dye

CuInS2 and MgO-modified S-doped biochar (CIS-Mg/S-BC) was prepared by one-step pyrolysis to improve the adsorption-photocatalytic performance of biochar for in RhB removal. The photo-induced electrons and holes were efficiently separated and migrated at the junction interface among CuInS2, MgO, and S-doped biochar, enlarging visible light absorption. Langmuir and second-order models well described the adsorption isotherms and kinetics of S-BC-based hybrids, respectively. The best removal efficiency over 2d-CIS-Mg/S-BC for 400 mg L-1 RhB solution was 97.67 % within 120 min while reduced to 95.62 % after five cycles. Therefore, CIS-Mg/S-BC composites have a broad application prospect in industrial wastewater purification.

Automated summary

CuInS2 and MgO-modified S-doped biochar (CIS-Mg/S-BC) was prepared to enhance the adsorption-photocatalytic performance of biochar for RhB removal. The efficient separation and migration of photo-induced electrons and holes at the junction interface enlarged the visible light absorption. Langmuir and second-order models were used to describe the adsorption isotherms and kinetics of S-BC-based hybrids, respectively. The results showed that 2d-CIS-Mg/S-BC had a high removal efficiency for RhB solution and potential application in industrial wastewater purification.