title: An oxygen-vacancy rich 3D novel hierarchical MoS2/BiOI/AgI ternary nanocomposite: enhanced photocatalytic activity through photogenerated electron shuttling in a Z-scheme manner.
abstract: An oxygen-vacancy rich, bismuth oxyiodide-based Z-scheme 3D hierarchical MoS2/BiOI/AgI ternary nanocomposite photocatalyst was fabricated using a simple precipitation process in ethylene glycol and water. The presence of oxygen-vacancies in BiOI and the two-dimensional nature of molybdenum disulfides in the composite prolongs the charge carrier lifetime through a Z-scheme system and enhances the performance of the photocatalyst for the degradation of rhodamine B. On the basis of efficient separation of photoexcited electron-hole pairs, a mechanism is proposed whereby MoS2and oxygen vacancy states increase charge carrier lifetimes and improve the photocatalytic activity. The Z-scheme mechanism of the photocatalysis is consistent with the results of static and time-resolved photoluminescence, scavenging, and terephthalic acid photoluminescence experiments. Among the as-synthesized photocatalysts, the one containing 2 wt% of MoS2in a composite of MoS2/BiOI/AgI exhibited the highest photocatalytic activity towards rhodamine B degradation, and its activity was 7 and 16 times higher than that of BiOI/AgI and BiOI, respectively. Degradation of phenol, the colorless model pollutant, was studied to confirm the visible-light photocatalytic performance of the MoS2/BiOI/AgI composite. This easily fabricated Z-scheme based MoS2/BiOI/AgI composite exhibits promising photocatalytic activity and will be useful for potential applications in energy and environmental areas.
authors.affiliation: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea. tkkim@pusan.ac.kr.
authors.forename: M
authors.initials: M
authors.lastname: Jahurul Islam
authors.affiliation: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea. tkkim@pusan.ac.kr.
authors.forename: D
authors.initials: D
authors.lastname: Amaranatha Reddy
authors.affiliation: Department of Chemistry, Kyung Hee University, Seoul 130-701, Republic of Korea. jaeksong@khu.ac.kr.
authors.forename: Noh Soo
authors.initials: NS
authors.lastname: Han
authors.affiliation: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea. tkkim@pusan.ac.kr.
authors.forename: Jiha
authors.initials: J
authors.lastname: Choi
authors.affiliation: Department of Chemistry, Kyung Hee University, Seoul 130-701, Republic of Korea. jaeksong@khu.ac.kr.
authors.forename: Jae Kyu
authors.initials: JK
authors.lastname: Song
authors.affiliation: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea. tkkim@pusan.ac.kr.
authors.forename: Tae Kyu
authors.identifier: http://orcid.org/0000-0002-9578-5722
authors.initials: TK
authors.lastname: Kim