Trace Amount of SnO2-Decorated ZnSn(OH)6 as Highly Efficient Photocatalyst for Decomposition of Gaseous Benzene: Synthesis, Photocatalytic Activity, and the Unrevealed Synergistic Effect between ZnSn(

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• 作者：Xianliang Fu ; Jinghui Wang ; Danwei Huang ; Sugang Meng ; Zizhong Zhang ; Longfeng Li ; Tifang Miao ; Shifu Chen
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：February 5, 2016
• 年：2016
• 卷：6
• 期：2
• 页码：957-968
• 全文大小：890K
• ISSN：2155-5435

文摘

It is still a challenge to develop a high-performance photocatalyst for the abatement of aromatic compounds like benzene (C₆H₆), which has been regarded as a priority hazardous volatile organic compound substance in the indoor atmosphere. Zinc hydroxystannate (ZnSn(OH)₆, ZHS) is a promising material for this application. However, the key structural features that are responsible for the high activity are still ambiguous. To address this issue, a series of ZHS with different surface properties were hydrothermally synthesized by varying the treatment temperature and the solution pH. Although ZHS can be readily synthesized under a mild reaction condition (temp 90–120 °C, pH 4–10), most of the samples were contaminated by a trace amount of low-crystallized SnO₂. Pristine ZHS can only be produced in a strong alkaline solution (pH 13). The sample prepared at 120 °C in a pH 10 solution shows the highest activity for the degradation of gaseous C₆H₆ and an efficiency almost 6 times higher than P25 (TiO₂). More importantly, no obvious deactivation of the sample and the formation of stable deposits were observed in a long-term reaction for 48 h. Although the SnO₂ amount is quite small and bare ZHS shows almost no activity, both of them are indispensable for the degradation of C₆H₆. SnO₂ and ZHS can be understood as photoactive sites to produce charge carriers and preferential sites for the adsorption of O₂, H₂O, and C₆H₆, respectively. A synergistic effect between SnO₂ and ZHS in the formation of active radicals and the degradation of C₆H₆ accounts for the high performance of the SnO₂-decorated ZHS.