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Peroxymonosulfate activation by CuMn-LDH for the degradation of bisphenol A: Effect, mechanism, and pathway. | LitMetric

Peroxymonosulfate activation by CuMn-LDH for the degradation of bisphenol A: Effect, mechanism, and pathway.

Ecotoxicol Environ Saf

College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China; Guangxi Key Laboratory of Theory & Technology for Environmental Pollution Control, Guilin University of Technology, Guilin 541004, China.

Published: January 2024

AI Article Synopsis

  • * It was found that CuMn-LDH successfully degrades BPA with a high efficiency of 95% under neutral and alkaline conditions, requiring just 40 minutes for complete degradation when combined with peroxymonosulfate (PMS).
  • * The research also identifies the generation of various reactive oxygen species during the reaction and proposes a nonradical degradation mechanism for BPA, suggesting new methods for treating organic pollutants in water.

Article Abstract

The remediation of water contaminated with bisphenol A (BPA) has gained significant attention. In this study, a hydrothermal composite activator of CuMn-LDH containing coexisting phases of cupric nitrate (Cu(NO)) and manganous nitrate (Mn(NO)) was synthesized. Advanced oxidation processes were employed as an effective approach for BPA degradation, utilizing CuMn-LDH as the catalyst to activate peroxymonosulfate (PMS). The synthesis of the CuMn-LDH material was characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). According to the characterization data and screening experiments, CuMn-LDH was selected as the best experimental material. CuMn-LDH exhibits remarkable catalytic ability with PMS, demonstrating good degradation efficiency of BPA under neutral and alkaline conditions. With a PMS dosage of 0.25 g·L and CuMn-LDH dosage of 0.10 g·L, 10 mg·L BPA (approximately 17.5 μM) can be completely degraded within 40 min, of which the TOC removal reached 95%. The reactive oxygen species present in the reaction system were analyzed by quenching experiments and EPR. Results showed that sulfate free radicals (SO), hydroxyl free radicals (•OH), superoxide free radicals (•O), and nonfree radical mono-oxygen were generated, while mono-oxygen played a key role in degrading BPA. CuMn-LDH exhibits excellent reproducibility, as it can still completely degrade BPA even after four consecutive cycles. The degradation intermediates of BPA were detected by GCMS, and the possible degradation pathways were reasonably predicted. This experiment proposes a nonradical degradation mechanism for BPA and analyzes the degradation pathways. It provides a new perspective for the treatment of organic pollutants in water.

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Source
http://dx.doi.org/10.1016/j.ecoenv.2024.115929DOI Listing

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