过硫酸盐
激进的
化学
光催化
降级(电信)
羟基自由基
三元运算
催化作用
光化学
电子顺磁共振
纳米复合材料
纳米颗粒
材料科学
有机化学
纳米技术
电信
物理
核磁共振
计算机科学
程序设计语言
作者
Xiaoming Peng,Wendong Luo,Jianqun Wu,Fengping Hu,Yuying Hu,Lihua Xu,Gaoping Xu,Yan Jian,Dai Hirata
出处
期刊:Chemosphere
[Elsevier]
日期:2021-04-01
卷期号:268: 128806-128806
被引量:20
标识
DOI:10.1016/j.chemosphere.2020.128806
摘要
In this study, novel core-shell catalyst with a new ternary heterostructure was synthesized (Fe0@POCN/CQDs) for the degradation of tetracycline (TC). The TEM results showed that the Fe0 particles were wrapped in POCN material and many nano CQDs were uniformly dispersed in the material. The new ternary nanocomposite exhibits excellent photocatalytic activity for the removal of TC, which was approximately 4.76 times higher than that of GCN. The enhancement of photocatalytic activity was attributed to the effective heterojunction as well as the multiply synergistic effects of POCN combined with Fe0 and CQDs, which was beneficial for retardation of recombination rate of photogenerated electron–hole pairs and generation of more free radicals for the oxidation of TC. Besides, the reactive oxygen species (ROS) of h+, •O2− and •OH played pivotal roles in the degradation of TC by Fe0@POCN/CQDs during the photocatalytic reaction. At the same times, sulfate radical (SO4•-) and hydroxyl radical (•OH) highlighted the dominant role in the degradation process compared with other free radicals under persulfate hybrid mixture system (PS system), which was further confirmed by radical scavenger experiments and electron spin resonance (ESR) analysis. The response surface methodology (RSM) study indicated that the optimal removal parameters of tetracycline could reach 97.57% within 30 min under PS system. In addition, the possible degradation pathway intermediates of TC were studied by HPLC-MS and the reaction catalytic activity mechanism of Fe0@POCN/CQDs/persulfate system was discussed.
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