The covalent Coordination-driven Bi2S3@NH2-MIL-125(Ti)-SH heterojunction with boosting photocatalytic CO2 reduction and dye degradation performance

Herein, the optional and controllable growth of Bi2S3 onto NH2-MIL-125 via covalent conjunction strategy was reported. The experimental results demonstrate that the obtained heterojunction exhibits boosting photocatalytic reduction CO2 and organic dye degradation. The 18-Bi2S3@NH2-MIL-125-SH displays the highest yield of 12.46 lmol g(-1)h(-1) of CO, >13 times that of pure NH2-MIL-125. Meanwhile, the reaction kinetic of 18-Bi2S3@NH2-MIL-125-SH in the degradation of methylene blue is uppermost, which is 160 times than that of the commercial P25. The enhancement of photocatalytic performance could be ascribed to the covalent coordination-driven intimate interfacial interaction in n-scheme heterojunction. Meanwhile, the plausible mechanism was also investigated by UV-vis diffuse reflectance (UV-vis), photoluminescence (PL), electrochemical photocurrent, electron spin resonance (ESR) and electrochemical impedance spectroscopy (EIS). (C) 2021 Elsevier Inc. All rights reserved.

Automated summary

The growth of Bi2S3 onto NH2-MIL-125 via a covalent conjunction strategy resulted in the enhancement of photocatalytic CO2 reduction and organic dye degradation. The heterojunction 18-Bi2S3@NH2-MIL-125-SH exhibited significantly higher performance compared to pure NH2-MIL-125 and commercial P25. The improved photocatalytic activity was attributed to the intimate interfacial interaction in the n-scheme heterojunction.