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Understanding oxygen-deficient La2CuO4-δperovskite activated peroxymonosulfate for bisphenol A degradation: The role of localized electron within oxygen vacancy
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2020-11-25 , DOI: 10.1016/j.apcatb.2020.119732
Hanxiao Chen , Yin Xu , Kangmeng Zhu , Hui Zhang

An A2BO4-type oxygen-deficient perovskite (La2CuO4-δ, LCO), which owns a better low-temperature reducibility, more abundant oxygen vacancies (OVs) and surface oxygen species than the benchmark CuO oxide, was first applied in peroxymonosulfate (PMS) activation. At 0.7 g/L of LCO and 2 mM of PMS, more than 96 % of bisphenol A (BPA) was removed within 60 min over a wide pH range of 3.1 ‒ 9.1. The cycle of surface Cu(II)/Cu(I) redox couple and lattice oxygen (O2−)/O2 were responsible for PMS activation. Besides, the OVs with localized electrons may directly activate PMS through single electron transfer pathway to generate surface-bound hydroxyl radical (radical dotOH) and sulfate radical (SO4radical dot), as well as less singlet oxygen (1O2) for BPA degradation. The evolution of radical dotOH, SO4radical dot and 1O2 were revealed by EPR tests. Briefly, this study provides the mechanistic understanding of A2BO4-type perovskite in activation of PMS for water treatment.



中文翻译:

了解缺氧La 2 CuO4 钙钛矿活化过氧单硫酸盐对双酚A降解的作用:局部电子在氧空位中的作用

首先是A 2 BO 4型缺氧钙钛矿(La 2 CuO4 ,LCO),它具有比基准CuO氧化物更好的低温还原性,更丰富的氧空位(OVs)和表面氧种类。用于过一硫酸盐(PMS)活化。在0.7 g / L的LCO和2 mM的PMS下,在3.1 9.1的宽pH范围内,在60分钟内去除了96%以上的双酚A(BPA)。表面Cu(II)/ Cu(I)氧化还原对和晶格氧(O 2-)/ O 2的循环是PMS活化的原因。此外,具有局部电子的OVs可以通过单电子转移途径直接激活PMS,从而产生表面结合的羟基(激进点OH)和硫酸根(SO 4 激进点- ),以及较少的单线态氧(1 Ò 2)为BPA降解。的演变激进点OH,SO 4 激进点-1 ö 2通过EPR试验揭示。简而言之,该研究提供了在水处理中激活PMS时A 2 BO 4型钙钛矿的机理。

更新日期:2020-12-16
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