Insights into the efficient removal and mechanism of NiFeAl-LDH with abundant hydroxyl to activate peroxymonosulfate for sulfamethoxazole wastewater.

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  • Additional Information
    • Source:
      Publisher: Academic Press Country of Publication: United States NLM ID: 0043125 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1095-7103 (Electronic) Linking ISSN: 00219797 NLM ISO Abbreviation: J Colloid Interface Sci Subsets: MEDLINE
    • Publication Information:
      Publication: Orlando, FL : Academic Press
      Original Publication: New York.
    • Subject Terms:
      Sulfamethoxazole*/chemistry ; Sulfamethoxazole*/isolation & purification ; Wastewater*/chemistry ; Peroxides*/chemistry ; Water Pollutants, Chemical*/isolation & purification ; Water Pollutants, Chemical*/chemistry ; Water Pollutants, Chemical*/metabolism ; Nickel*/chemistry ; Hydroxides*/chemistry; Water Purification/methods ; Surface Properties
    • Abstract:
      Layered double hydroxide (LDH) material with abundant OH was successfully prepared by co-precipitation method, and a water purification system of Ni 2 Fe 0.25 Al 0.75 -LDH activated peroxymonosulfate (PMS) was constructed to rapidly degrade sulfamethoxazole (SMX) pollutants. The optimal conditions for the degradation of SMX in the system were as follows: 0.30 g/L Ni 2 Fe 0.25 Al 0.75 -LDH, 0.30 mM PMS, pH = 7 and 90 % SMX was removed in 10 min and almost completely in 40 min, which was consistent with the predicted results of response surface methodology (RSM) analysis. The abundant OH in Ni 2 Fe 0.25 Al 0.75 -LDH could form M(O)OSO 3 complexes with PMS, accelerating the generation of reactive oxygen species (ROS) and promoting the removal of SMX. Quenching experiments and electron paramagnetic resonance (EPR) spectra showed that SO 4 - , OH, O 2 - and 1 O 2 also existed in the system. The surface-bound SO 4 - and O 2 - contributed greatly to the removal of SMX and the electron transfer between metals was also conducive to the production of active substances. The possible degradation pathways and intermediates of SMX were proposed. The toxicity assessment software tool (T.E.S.T) and total organic carbon (TOC) results indicated that the Ni 2 Fe 0.25 Al 0.75 -LDH/PMS system could reduce the overall environmental risk of SMX to some extent. This study provided a new strategy for the practical application of heterogeneous catalysts in sewage treatment.
      Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
      (Copyright © 2024 Elsevier Inc. All rights reserved.)
    • Contributed Indexing:
      Keywords: Degradation pathways; Layered double hydroxides; Peroxymonosulfate; Sulfamethoxazole; Surface bound hydroxyl and sulfate ions
    • Accession Number:
      JE42381TNV (Sulfamethoxazole)
      22047-43-4 (peroxymonosulfate)
      0 (Wastewater)
      0 (Peroxides)
      0 (Water Pollutants, Chemical)
      7OV03QG267 (Nickel)
      0 (Hydroxides)
    • Publication Date:
      Date Created: 20240903 Date Completed: 20241025 Latest Revision: 20241025
    • Publication Date:
      20241026
    • Accession Number:
      10.1016/j.jcis.2024.08.171
    • Accession Number:
      39226833