Construction of novel Z-scheme flower-like Bi_2S_3/SnIn_4S_8 heterojunctions with enhanced visible light photodegradation and bactericidal activity

摘要

Novel Z-scheme flower-like Bi2S3/SnIn4S8 heterostructures were firstly fabricated through a facile one-step solvothermal method. The Z-scheme Bi2S3/SnIn4S8 heterostructures exhibited excellent sustainable photocatalytic activity of degradation of Rhodamine B ( RhB) and disinfection towards bacteria in aqueous solution under visible light irradiation (lambda 420 nm). The Bi2S3/SnIn4S8-2.5% heterostructure displayed the highest photocatalytic performance of decomposition of RhB and disinfection towards gram-negative E.coli and grampositive S. aureus under visible light irradiation and its degradation constant was about 2 times to that of SnIn4S8, 7.5 times to that of Bi2S3, respectively. The enhanced photocatalytic performance of Bi2S3/SnIn4S8 heterojunctions primarily ascribe to the Z-scheme mechanism which not only promote the separation and migration of photoproduced hole-pairs, but also maintain a superior redox capacity. Additionally, the distinct flower-like architecture of Bi2S3/SnIn4S8 heterojunctions is the another favor factor for the higher photocatalytic activity for providing more contact interface and active sites between the target materials and catalysts and enhancing the visible light harvest. This present work creates an avenue for design and application of Z-scheme SnIn4S8-base photocatalysts in remediation of pathogenic microbes and organic pollutants contaminated water.