Zn:In(OH)(y)S-z Solid Solution Nanoplates: Synthesis, Characterization, and Photocatalytic Mechanism
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AbstractZn:In(OH)(y)S-z solid solution nanoplates (Zn:In(OH)(y)S-z-SSNs) with uniform nanoparticle size were synthesized through a simple sodium dodecyl sulfate (SOS)-assisted hydrothermal process. To achieve better photoabsorption in the visible light K) region and suitable redox potentials of the Zn-In(OH)(y)S-z solid solution (Zn:In(OH)(y)S-z-SS), the substitution of S2- for OH- was carried out by adjusting the concentration of thiourea and SOS in the synthesis solution, while the doping of Zn2+ was realized by adjusting Zn2+ concentration. In addition, the morphology and crystallinity of Zn:In(OH)(y)S-z-SSs were also controlled by the concentration of SOS. Using Rhodamine B (RhB) as a target pollutant, the photocatalytic performance of these Zn:In(OH)(y)S-z-SSs with different components, diameter sizes, and morphologies was investigated. Remarkably, Zn:In(OH)(y)S-z-SSNs prepared with atomic ratio of Zn2+ and In3+ of 0.6, 45 mmol L-1 thiourea, and 26 mmol L- 1 SOS, have the highest visible-light-driven (VLD) photocatalytic activity, exceeding 95% for the degradation of RhB after 60 min. The investigation of photocatalytic mechanism further indicates that the holes, superoxide radical (center dot O-2(-)) and surficial hydroxyl radical (center dot OHs) are the major reactive species for the photocatalytic reactions. More importantly, for the first time, a simple and versatile strategy is developed to confirm the fact that direct contact between the Zn:In(OH)(y)S-z-SS and RhB is the prerequisite for the photocatalytic degradation of RhB. Therefore, we report not only the preparation of a novel and effective VL-driven photocatalyst, but also provide mechanistic insight into semiconductor photocatalysis.
All Author(s) ListZhang LS, Wong KH, Zhang DQ, Hu C, Yu JC, Chan CY, Wong PK
Journal nameEnvironmental Science and Technology
Volume Number43
Issue Number20
PublisherAmerican Chemical Society
Pages7883 - 7888
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesEngineering; Engineering, Environmental; ENGINEERING, ENVIRONMENTAL; Environmental Sciences; ENVIRONMENTAL SCIENCES; Environmental Sciences & Ecology

Last updated on 2020-10-10 at 23:46