ABNO-Functionalized Silica as an Efficient Catalyst for Enhancing Permanganate Oxidation of Emerging Contaminants

Honglong Zhang; Jun Ma; Timothy J. Strathmann

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ABNO-Functionalized Silica as an Efficient Catalyst for Enhancing Permanganate Oxidation of Emerging Contaminants

机译：ABNO-Functionalized Silica as an Efficient Catalyst for Enhancing Permanganate Oxidation of Emerging Contaminants

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Recent reports indicate that some soluble electron-shuttling compounds (or organic mediators) can accelerate reactions between permanganate (Mn(Vll)) and contaminants of emerging concern. However, practical application is limited to homogeneous electron-shuttling compounds. This study reports on the development and application of a heterogeneous electron-shuttling catalyst for Mn(VIl) reactions with bisphenol A (BPA). First, we screened a series of poly/monocyclic nitroxides, finding that 9-azabicyclo[3.3.l]nonane N-oxyl (ABNO) provides the most significant enhancement of Mn(VIl)/BPA reaction kinetics, where Mn(Vll) oxidizes ABNO to BPA-reactive ABNO+. Next, we immobilized ABNO onto silica (Si02) by covalent bonding of 9-azabicyclo[3,3,l]nonan-3-one-9-oxyl (keto-ABNO) via a 3-amino-propyltriethoxysilane bridge to yield an ABNO(a>Si02 heterogeneous catalyst. The performance of ABNO(a)Si02 in catalyzing Mn(VIl)/BPA reactions is demonstrated, with BPA reaction kinetics being highly dependent on catalyst dosage and pH conditions. The stability of ABNO(3)Si02 was retained at pH 5.0 and decreased slightly at pH 7.0 over five successive Mn(VIl)/BPA reaction cycles. Kinetics modeling shows that BPA reacts with immobilized ABNO+, Mn(VIl), and in situ formed Mn02. Moreover, ABNO+ can form via ABNO reactions with both Mn(VIl) and the in situ formed Mn02. These results indicate a promising strategy for developing practical heterogeneous catalysts for enhancing Mn(VIl) reactivity and treatment applications.

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《Environmental Science & Technology: ES&T》 |2023年第1期|635-642|共8页
作者
Honglong Zhang; Jun Ma; Timothy J. Strathmann;
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作者单位

School of Environment, Harbin Institute of Technology, Harbin 150090, P. R China;

Department of Civil and Environmental Engineering Colorado School of Mines, Golden, Colorado 80401, United States;

School of Environment, Harbin Institute of Technology, Harbin 1S0090, P. R. China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
ABNO; silica; permanganate; bisphenol A; mechanism; stability;

ABNO-Functionalized Silica as an Efficient Catalyst for Enhancing Permanganate Oxidation of Emerging Contaminants

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