Polydopamine-modified MOF-5-derived carbon as persulfate activator for aniline aerofloat degradation

被引：3
作者：
Feng C. [1 ,2 ]
Liu S. [3 ]
Tan X. [1 ,2 ,4 ]
Dai M. [1 ,2 ]
Chen Q. [1 ,2 ]
Huang X. [1 ,2 ]
机构：
[1] College of Environmental Science and Engineering, Hunan University, Changsha
[2] Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha
[3] School of Architecture and Art, Central South University, Changsha
[4] Shenzhen Research Institute of Hunan University, Shenzhen
来源：
Chemosphere | 2023年 / 345卷
基金：
中国国家自然科学基金;
关键词：
Advanced oxidation processes; Aniline aerofloat; MOFs-derived porous carbon; Non-radical pathway; Polydopamine;
D O I：
10.1016/j.chemosphere.2023.140436
中图分类号：
学科分类号：
摘要：
Residual flotation chemicals in beneficiation wastewater seriously threaten local ecosystems, such as groundwater or soil, and must be treated effectively. Currently, the degradation of organic pollutants using nitrided MOFs-derived carbon to activate persulfate (PDS) has attracted considerable attention. Hence, we developed a new synthetic strategy to load dopamine hydrochloride (PDA) onto MOF-5-derived porous carbon (PC) to form NPC, and the degradation of a typical flotation Aniline aerofloat (AAF) at high salinity by a low dose of the NPC/PDS system was investigated. Several characterization analyses such as TEM, XRD, Raman, FT-IR and XPS demonstrated that the nitrogen-rich indolequinone unit in PDA provided nitrogen to PC during the pyrolysis process. This enabled the core-shell structure of NPC and the synergy among the multiple components to induce the AAF degradation by PDS over a wide pH scale in a short period of time. It was deduced that the degradation of AAF by the NPC-8/PDS system was a non-radical pathway dominated by 1O2, which relied mainly on the conversion of superoxide radicals (O2•−) and surface-bound radicals. Among them, the pyridine N in the sp2 hybrid carbon was considered as a possible active site. This non-radical pathway was resistant to pH changes and background substances in the water, and well overcame the inhibition of the reaction by natural organic substances and inorganic anions in natural water. In this study, A novel approach to the synthesis of homogeneous MOFs nuclear-derived porous carbon was proposed and the application of MOFs-derived porous carbon for AAF remediation of mineral processing wastewater was broadened. © 2023
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