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Catalytic degradation of dinotefuran by dielectric barrier discharge plasma combined with La-doping TiO2
Environmental Technology ( IF 2.8 ) Pub Date : 2021-02-03 , DOI: 10.1080/09593330.2021.1880488
Yixuan Huang 1 , Dan Guo 1 , Yongyang Chen 1 , Yanjia Xu 1 , Hao Chen 1 , Xiaochun Dong 1 , Shanping Li 1, 2
Affiliation  

ABSTRACT

Degradation of neonicotinoid insecticide dinotefuran (DIN) in dielectric barrier discharge (DBD) non-thermal plasma combined with lanthanum-doped titanium dioxide (La-TiO2) system was investigated. A La-TiO2 catalyst was prepared by the sol–gel method and characterized by SEM, XRD, and DRS. The effects of various factors (initial concentration, initial pH, input power, and addition of metal ions) on the removal rate of DIN were evaluated. The results indicated that when the initial concentration, input power, initial pH, and Fe2+ catalyst ions were 100 mg/L, 150 W, 10.5 and 50 mg/L, respectively, the DIN degradation efficiency was improved to 99.0% by coupling 10 wt% La-TiO2 at 180 min. La-TiO2 showed excellent catalytic performance on DIN degradation in a DBD system. The removal rate decreased with the presence of H2O2 and a scavenger, manifesting that HO plays an imperative role in the degradation process. Furthermore, intermediate products were analyzed by MS and the possible degradation pathway of DIN was proposed.



中文翻译:

介电势垒放电等离子体结合La掺杂TiO2催化降解呋虫胺

摘要

研究了介电阻挡放电(DBD)非热等离子体结合镧掺杂二氧化钛(La-TiO 2)体系对新烟碱类杀虫剂呋虫胺(DIN)的降解作用。采用溶胶-凝胶法制备了La-TiO 2催化剂,并通过 SEM、XRD 和 DRS 对其进行了表征。评估了各种因素(初始浓度、初始 pH 值、输入功率和金属离子添加)对 DIN 去除率的影响。结果表明,当初始浓度、输入功率、初始pH和Fe 2+催化剂离子分别为100 mg/L、150 W、10.5和50 mg/L时,通过耦合耦合,DIN降解效率提高到99.0%。 10 wt% La-TiO 2在 180 分钟。La-TiO 2在 DBD 系统中对 DIN 降解表现出优异的催化性能。去除率随着 H 2 O 2和清除剂的存在而降低,表明H在降解过程中起着至关重要的作用。此外,对中间产物进行了质谱分析,并提出了可能的 DIN 降解途径。

更新日期:2021-02-03
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