1. Efficient catalytic degradation of bisphenol A coordinated with peroxymonosulfate via anchoring monodispersed zero-valent iron on natural kaolinite.
- Author
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Li, Chunquan, Yang, Shanshan, Bian, Runze, Tan, Ye, Zhang, Xiangwei, Zheng, Shuilin, and Sun, Zhiming
- Subjects
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KAOLINITE , *BISPHENOL A , *IRON , *LIQUID chromatography-mass spectrometry , *PEROXYMONOSULFATE , *TRANSMISSION electron microscopes , *SODIUM borohydride - Abstract
[Display omitted] • Novel nZVI/kaolinite composite was prepared by liquid-phase reduction method. • nZVI particles with oxide layer were embedded into kaolinite surface and edges. • nZVI/kaolinite exhibits high efficiency for BPA removal with PMS activation. • SO 4 •− and 1O 2 were proved to be the main active components. • The possible degradation pathways were well analyzed and illustrated. Nano-zero valent iron/kaolinite (nZVI/kaolinite) composite was prepared by liquid-phase reduction method in the presence of sodium borohydride. Transmission Electron Microscope images demonstrated that spherical nZVI particles with oxide layer were successfully engaged into the kaolinite surface and edges, which was beneficial to the peroxymonosulfate (PMS) activation and bisphenol A (BPA) degradation. The prepared nZVI/kaolinite composite was endowed with excellent performance in removing BPA with the assistance of PMS, namely more than 95% BPA could be eliminated in 15 min. In contrast with alkaline environment, weak acid and neutral environment were more advantageous to the BPA degradation. All the anions like Cl−, SO 4 2−, HCO 3 − and H 2 PO 4 − were adverse to the BPA degradation in nZVI/kaolinite/PMS system. Furthermore, EPR and radical quenching experiments proved that SO 4 •− and 1O 2 were the main active components during the series reactions. The possible degradation pathways were also inferred based on the liquid chromatography-mass spectrometry (LC-MS) results. Besides, the nZVI/kaolinite composite displayed good performance toward coking wastewater as well. This study is of great significance in designing of efficient persulfate activated materials and treating wastewater. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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