A solar light-induced photo-thermal catalytic decontamination of gaseous benzene by using Ag/Ag3PO4/CeO2 heterojunction
A solar light-induced photo-thermal catalytic decontamination of gaseous benzene by using Ag/Ag3PO4/CeO2 heterojunction
复制标题
Ag/Ag3PO4/CeO2异质结太阳光诱导光热催化净化气态苯
DOI：
10.1016/j.cej.2020.126070
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发表时间：
2020-12-15
影响因子：
15.1
通讯作者：
Wang, Xiaojing
中科院分区：
文献类型：
--
作者：
Borjigin, Burenbayaer;Ding, Lan;Wang, Xiaojing
对大气中挥发性有机物（VOCs）的有效净化日益重要，但普遍面临着技术难度大、能耗高等问题。采用沉淀法制备了Z型Ag/Ag 3 PO 4/CeO 2异质结，并将其应用于苯的气相分解。在初始苯浓度为600 ppm的条件下，太阳光照射3 h，复合材料对苯的去除率为90.18%，TOC去除率为74.17%。提出了太阳光诱导热催化叠加的光催化机理。采用对太阳光有很强吸收能力的Ag 3 PO 4作为光催化剂组分，CeO 2作为热催化剂基质，CeO 2在较低温度下具有良好的导热性能。以Ag 3 PO 4原位还原产生的Ag-0作为电子中继平台，与Ag 3 PO 4和CeO 2一起形成Z型异质结。大量的CeO 2空位有助于增强对VOCs的预吸附。组装的Z型Ag/Ag 3 PO 4/CeO 2异质结特别有效地分离了光激发的电子和空穴，并保持了高的氧化还原电位来净化VOCs。同时，该复合材料具有多样性，对甲醛也具有良好的氧化能力，有望成为一种在方便的大气环境中净化VOCs的材料。
The effectively decontamination for atmosphere VOCs is getting more important whereas it is general facing the issues such as technical difficulties and high energy consumption. In this work, a Z-scheme Ag/Ag3PO4/CeO2 heterojunction was prepared with a precipitation method and was applied to decompose gaseous benzene at very convenient ambient conditions. The prepared composite presents a 90.18% removal rate and 74.17% TOC efficiency within 3 h solar light irradiation at an initial 600 ppm benzene concentration. A photo-catalytic mechanism superimposed with solar light induced thermo-catalysis is proposed. Ag3PO4 that has great solar light absorptive capacity is used as the photocatalytic component and CeO2 is used as thermo-catalytic substrate due to its good thermo-conductivity in lower temperature. Ag-0 produced from an in situ reduction of Ag3PO4 is used as an electronic relay platform to form a Z-type heterojunction together with Ag3PO4 and CeO2. Lots of vacancies of CeO2 contribute to the enhanced pre-adsorption towards to VOCs. The assembled Z-scheme Ag/Ag3PO4/CeO2 heterojunction is specially effectively for the separation of the photo-excited electrons and holes in space and maintains the highly redox potentials to decontaminate VOCs. Meanwhile, the composite is diverse, also having good oxidative power for HCHO, and thus could be a kind of promising material to purify VOCs in the convenient atmospheric environment.