Innovative green/non-toxic BiS@g-CN nanosheets for dark antimicrobial activity and photocatalytic depollution: Turnover assessment.

Herein, green and non-toxic bismuth sulphide@graphitic carbon nitride (BiS@g-CN) nanosheets (NCs) were firstly synthesized by ultrasonicated-assisted method and characterized with different tool. BiS@g-CN NCs antimicrobial activity tested against three types of microbes. As well the heterostructured BiS@g-CN NCs was investigated for removing dye and hexavalent chromium under visible light and showed high efficiency of photocatalytic oxidation/reduction higher than g-CN alone, attributing to lower recombination photogenerated electron-hole pairs. BiS@g-CN NCs showed high antimicrobial efficiencies against Staphylococcus aureus (S. aureus) as a Gram positive bacterium, Escherichia coli (E. Coli)as a Gram negative bacterium and Candida albicans (C. albicans) and that the disinfection rates are 99.97%, 99.98% and 99.92%, respectively. The core mechanism is that the bacterial membrane could be destroyed by reactive oxygen species. The BiS@g-CN NCs is promising for environmental disinfection including water and public facilities disinfection and solar photocatalytic depollution. Turnover number (TON) and Turnover frequency (TOF) are used as concise assessment indicator for photocatalytic efficiency.