还原氧化石墨烯/磷酸银光催化剂制备及其对卡马西平的降解

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Preparation and its application of reduced graphene oxide/Ag3PO4 composite photocatalyst for carbamazepine removal

TANG Junyi^1,,
ZHAO Zilong^1,2,
CHEN Guanhan¹,
DONG Wenyi^1,2,
ZHANG Jiahao³
1.School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518000, China
2.Shenzhen Key Laboratory of Water Resource Application and Environmental Pollution Control, Shenzhen 518000, China
3.School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510006, China

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摘要:为进一步增强Ag3PO4的催化应用性能，采用水热还原法制备还原氧化石墨烯/磷酸银(rGO/Ag3PO4)复合光催化剂并对其进行表征；考察了氧化石墨烯(GO)掺量、溶液pH、光源对其光催化降解卡马西平效果的影响；通过对催化降解过程中活性物种的确定，初步推断其降解机理。结果表明，复合改性有助于提高Ag3PO4颗粒分散性，增强其光响应能力和光催化活性。当GO掺量为0.7%，初始pH为5~9时，全波段辐射处理初始浓度200 μg·L-1，卡马西平在6 min内基本可实现对其完全降解。催化降解过程中光生空穴是主要的活性物质，其与羟基自由基、水合电子共同作用实现卡马西平的降解。
关键词: 光催化降解/
卡马西平/
石墨烯/磷酸银/
催化剂制备/
水热还原法

Abstract:To further enhance the photocatalytic performance of Ag3PO4, a composite photocatalyst of reduced graphene oxide/silver phosphate (rGO/Ag3PO4) was prepared by the hydrothermal reduction method and characterized. The effects of graphene oxide (GO) addition, solution pH and light source on carbamazepine photo-degradation were studied. And its degradation mechanism was preliminarily proposed on the basis of the photocatalytic active species identification. The results showed that the composite modification could not only improve the dispersibility of Ag3PO4 particles, but also strengthen their photoresponse and catalytic activity. For the rGO/Ag3PO4 with 0.7% GO doping, carbamazepine could be completed degraded after 6 min photocatalysis with full-wave radiation at the initial carbamazepine concentration of 200 μg·L-1 and pH of 5~9. During the process of photodegradation, photogenerated cavities were identified as be the main active substance, which combined with hydroxyl radicals and hydrated electrons to degrade carbamazepine.
Key words:photocatalytic degradation/
carbamazepine/
graphene/silver phosphate/
catalyst preparation/
hydrothermal reduction.

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刊出日期:2019-06-18

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