Engineering of Defect-Rich Cu2WS4 Nano-homojunctions Anchored on Covalent Organic Frameworks for Enhanced Gaseous Elemental Mercury Removal

Longlong Wang; Ke Zhang; Jiaxing Li

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Engineering of Defect-Rich Cu2WS4 Nano-homojunctions Anchored on Covalent Organic Frameworks for Enhanced Gaseous Elemental Mercury Removal

机译：Engineering of Defect-Rich Cu2WS4 Nano-homojunctions Anchored on Covalent Organic Frameworks for Enhanced Gaseous Elemental Mercury Removal

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Fabricating two-dimensional transition-metal di-chalcogenide (TMD)-based unique composites is an effective way to boost the overall physical and chemical properties, which will be helpful for the efficient and fast capture of elemental mercury (Hg~0) over a wide temperature range. Herein, we constructed a deflect-rich Cu2WS4 nano-homojunction decorated on covalent organic frameworks (COFs) with abundant S vacancies. Highly well-dispersed and uniform Cu2WS4 nano-particles were immobilized on COFs strongly via an ion pre-anchored strategy, consequently exhibiting enhanced Hg~0 removal performance. The saturation adsorption capacity of Cu2WS4@ COF composites (21.60 mg·g~(-1)) was 9 times larger than that of Cu2WS4 crystals, which may be ascribed to more active S sites exposed in hybrid interfaces formed in the Cu2WS4 nano-homojunction and between Cu2WS4 nanoparticles and COFs. More importandy, such hybrid materials reduced adsorption deactivation at high temperatures, having a wide operating temperature range (from 40 to 200 °C) owing to the thermostability of active S species immobilized by both physical confined and chemical interactions in COFs. Accordingly, this work not only provides an effective method to construct uniform TMD-based sorbents for mercury capture but also opens a new realm of advanced COF hybrid materials with designed functionalities.

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来源
《Environmental Science & Technology: ES&T》 |2022年第22期|16240-16248|共9页
作者
Longlong Wang; Ke Zhang; Jiaxing Li;
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作者单位

School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;

School of Environmental Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, People's Republic of 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
transition-metal dichalcogenides; covalent organic frameworks; nano-homojunction; elemental mercury; adsorption;

Engineering of Defect-Rich Cu2WS4 Nano-homojunctions Anchored on Covalent Organic Frameworks for Enhanced Gaseous Elemental Mercury Removal

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