Activatoin of peroxymonosulfate by Sr-doped LaCo0.5Cu0.5O3 perovskite

doi:10.16085/j.issn.1000-6613.2019-2006

Abstract

Abstract:

Sr-doped La_xSr_1-_xCo_0.5Cu_0.5O₃ perovskite at A site was prepared by sol-gel method to enhance the activation of peroxymonosulfate (PMS) by B-site. La_0.7Sr_0.3Co_0.5Cu_0.5O₃ perovskite was found to show the best catalytic effect on PMS activation. The effects of catalyst loading, PMS concentration, pH value and common ions (e.g., Cl^-) in dye wastewater were evaluated on the degradation of AO7 in La_0.7Sr_0.3Co_0.5Cu_0.5O₃/PMS system, and the reusability and mineralization ability of the material were further tested. Results show that the degradation of AO7 was accelerated with the increase of perovskite loading and PMS concentration. Neutral pH was most favorable for the degradation of AO7 with substantial mineralization. ·OH was determined as one of the main active species responsible for AO7 degradation, but the increase of O vacancy in perovskite after Sr doping makes ¹O₂ also participate in the degradation process.

Key words: perovskite, activation, peroxymonosulfate（PMS）, degradation, hydroxyl radicals, singlet oxygen

摘要：

采用溶胶-凝胶法制备A位掺Sr的La_xSr_1-_xCo_0.5Cu_0.5O₃钙钛矿增强传统B位掺杂钙钛矿活化过一硫酸盐（PMS）的能力。本文选取效果最好的La_0.7Sr_0.3Co_0.5Cu_0.5O₃型钙钛矿为研究对象，以偶氮染料AO7为目标污染物，考察了钙钛矿投加量、PMS浓度、pH和染料废水中常见Cl^-对La_0.7Sr_0.3Co_0.5Cu_0.5O₃/PMS体系降解AO7的影响，并测试了材料的重复利用性和矿化能力。结果表明，La_0.7Sr_0.3Co_0.5Cu_0.5O₃/PMS降解AO7的速度随着材料投加量和PMS浓度的增加而加快，在中性条件下反应速度最快且矿化率良好。该体系主要活性物种之一为·OH，但Sr掺杂后钙钛矿的O空位增多使得¹O₂也参与到降解过程之中。

关键词: 钙钛矿, 活化, 过一硫酸盐（PMS）, 降解, 基羟自由基, 单线态氧

CLC Number:

Jie XU, Shiqian GAO, Jing XIA, Ke ZHANG, Zichun SHAO, Lanjing WANG, Yongjing TIAN. Activatoin of peroxymonosulfate by Sr-doped LaCo_0.5Cu_0.5O₃perovskite[J]. Chemical Industry and Engineering Progress, 2020, 39(9): 3525-3534.

徐劼, 高仕谦, 夏晶, 张珂, 邵子纯, 王澜静, 田永静. Sr掺杂强化LaCo_0.5Cu_0.5O₃型钙钛矿活化过一硫酸盐的性能[J]. 化工进展, 2020, 39(9): 3525-3534.

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Activatoin of peroxymonosulfate by Sr-doped LaCo_0.5Cu_0.5O₃perovskite

Sr掺杂强化LaCo_0.5Cu_0.5O₃型钙钛矿活化过一硫酸盐的性能

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