Bifunctional synergistic S-scheme Mn0.25Cd0.75S/honeycomb-like g-C3N4 heterojunction for efficient photocatalytic H2 evolution integrated with amoxicillin degradation

Abstract

The development of efficient catalysts for simultaneous photocatalytic hydrogen evolution and degradation of organic pollutants is one of the most ideal methods to solve energy problems and environmental pollution. In the present study, an S-scheme Mn0.25Cd0.75S/honeycomb-like g-C3N4 (MCS/HCN) heterojunction is synthesized using simple hydrothermal and calcination methods. It is found that the S-scheme MCS/HCN heterojunction can promote the separation and transfer of charge carriers through the IEF constructed after the rebalancing of Fermi energy levels. Under visible light irradiation, the degradation efficiency of amoxicillin (AMX) for the MCS/HCN composite is 98 %, and the synergistic production of hydrogen is 2668 μmol·h−1·g−1. The photocatalytic performance remains basically unchanged after four cycles. At the same time, the photodegradation path of AMX was analyzed by highperformanceliquidchromatography-tandemmassspectrometry (HPLC-MS). Furthermore, the photocatalytic H2 evolution integrated with amoxicillin degradation mechanism of the S-scheme MCS/HCN heterojunction is also proposed. This work is helpful to design new photocatalyst materials with S-scheme heterojunction for simultaneous photocatalytic hydrogen evolution and degradation of organic pollutants.