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Efficient charge transfer in aluminum-cobalt layered double hydroxide derived from Co-ZIF for enhanced catalytic degradation of tetracycline through peroxymonosulfate activation

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成果类型:
期刊论文
作者:
JiaoCao;SaiwuSun;XinLi;ZhaohuiYang;WeipingXiong;YouWu;MeiyingJia;YaoyuZhou;ChengyunZhou;YanruZhang
作者机构:
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China
Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
语种:
中文
关键词:
Aluminum-cobalt layered double hydroxide (AlCo-LDH);Cobalt zeolitic imidazolate framework (Co-ZIF);PMS activation;Tetracycline (TC);Actual wastewater
期刊:
Chemical Engineering Journal
ISSN:
1385-8947
年:
2020
卷:
382
期:
Volume 382
页码:
122802-
机构署名:
本校为其他机构
院系归属:
资源环境学院
摘要:
In consideration of the complex synthesis of layered double hydroxides (LDHs), a simple and efficient strategy was needed to design and fabricate LDHs with high performance. In this study, aluminum-cobalt layered double hydroxide (AlCo-LDH) with uniformly distributed component was synthesized by in-situ etching of cobalt zeolitic imidazolate framework (Co-ZIF) at room temperature. The obtained AlCo-LDH showed high catalysis performance of tetracycline (TC) degradation via the activation of peroxymonosulfate (PMS). The removal efficiency can reach to 92.3% within 5 min and 49.1% of TOC removal efficiency could be obtained in 30 min. Moreover, the degradation rate constants of AlCo-LDH/PMS system (0.980 min−1) was about 16.6 times higher than Co-ZIF/PMS system (0.059 min−1). The unique hydrotalcite-like layered structure of AlCo-LDH with large surface area and volume made TC molecules diffused and interacted with the reaction sites more easily. More importantly, the higher content of Al ions in AlCo-LDH catalyst helped the low content of Co ions to activate PMS. The forming process of AlCo-LDH and the TC degradation mechanisms were investigated. The quenching experiments combined with electron paramagnetic resonance (EPR) analysis showed the SO4− and 1O2 radicals were the main reactive species for TC degradation. Moreover, the AlCo-LDH catalyst was stable in water for the negligible leaking of metal ions. Significantly, the AlCo-LDH/PMS system was effective and almost unaffected by pH values, organic and inorganic matters in water. In addition, high removal efficiencies were achieved in various real samples by the AlCo-LDH/PMS system. This work provided a novel and facile route to synthesis advanced MOF-derived LDHs catalyst with high performance in remediation of actual wastewater.

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