摘要
为进一步增强Ag_3PO_4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Ag_3PO_4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200μg·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。
To further enhance the photocatalytic performance of Ag_3PO_4, a composite photocatalyst of reduced graphene oxide/silver phosphate(rGO/Ag_3PO_4) 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 Ag_3PO_4 particles, but also strengthen their photoresponse and catalytic activity. For the rGO/Ag_3PO_4 with 0.7% GO doping, carbamazepine could be completed degraded after 6 min photocatalysis with fullwave 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.
引文
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