Degradation of bisphenol A in an oxidation system constructed from Mo2C MXene and peroxymonosulfate

被引:30
作者
Chen, Xuwen [1 ]
Gudda, Fredrick Owino [1 ]
Hu, Xiaojie [1 ]
Waigi, Michael Gatheru [1 ]
Gao, Yanzheng [1 ]
机构
[1] Nanjing Agr Univ, Inst Organ Contaminant Control & Soil Remediat, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China
基金
美国国家科学基金会;
关键词
HETEROGENEOUS CATALYSTS; PHOTOCATALYTIC ACTIVITY; HYDROTHERMAL SYNTHESIS; GRAPHENE OXIDE; WASTE-WATER; PERSULFATE; ACTIVATION; EFFICIENCY; RADICALS; NANOPARTICLES;
D O I
10.1038/s41545-022-00214-w
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The etched Mo2C MXene with a layered structure was characterized as an environmentally friendly catalyst in the bisphenol A (BPA) removal by advanced oxidation. 99.75% of BPA was degraded in the oxidation system constructed using Mo2C MXene and peroxymonosulfate (PMS). The Mo2C MXene was recyclable, with a high removal percentage (89.29%) of BPA after even four cycles. The catalysis of Mo2C MXene on PMS was due to the Mo-deficit vacancy defects. The electron paramagnetic resonance technique and density functional theory (DFT)-based density of states calculations verified defect signals. In addition, the defective Mo2C MXene and PMS have strong binding and electron transfer capabilities. The reactive oxygen species (ROS, including O-2(center dot -), O-1(2), SO4 center dot , and (OH)-O-center dot ) produced by Mo2C MXene activates PMS, leading to BPA degradation. The condensed Fukui function predicted the active sites of the BPA molecule and found that the O1, O2, C3, C4, C6, C12, C15, and C16 sites have higher electrophilic reactivity. The C, C-C bonds, or C4/C16 sites in the isopropyl group connecting the two phenolic rings were attacked first, then further transformed BPA into non-toxic or low toxic small molecule degradation products through a series of reactions such as bond-breaking, addition, hydroxylation, and ring-opening. Moreover, the Mo2C MXene/PMS system has strong applicability in actual water bodies. The study provides valuable insights into PMS activation by two-dimensional MXenes to remove toxic organic pollutants in an aqueous matrix.
引用
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页数:11
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