Vacancy-Rich CoSx@LDH@Co-NC Catalytic Membrane for Antibiotic Degradation with Mechanistic Insights

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

12 Scopus Citations
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Author(s)

  • Jian Ye
  • Xu Tang
  • Zefang Chen
  • Jie Yang
  • Pengwei Huo
  • John Crittenden

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)16131–16140
Journal / PublicationEnvironmental Science and Technology
Volume57
Issue number42
Online published9 Oct 2023
Publication statusPublished - 24 Oct 2023

Abstract

Improving the wettability of carbon-based catalysts and overcoming the rate-limiting step of the Mn+1/Mn+ cycle are effective strategies for activating peroxymonosulfate (PMS). In this study, the coupling of Co-NC, layered double hydroxide (LDH), and CoSx heterostructure (CoSx@LDH@Co-NC) was constructed to completely degrade ofloxacin (OFX) within 10 min via PMS activation. The reaction rate of 1.07 min-1 is about 1-2 orders of magnitude higher than other catalysts. The interfacial effect of confined Co-NC and layered double hydroxide (LDH) not only enhanced the wettability of catalysts but also increased the vacancy concentration; it facilitated easier contact with the interface reactive oxygen species (ROS). Simultaneously, reduced sulfur species (CoSx) accelerated the Co3+/Co2+ cycle, acquiring long-term catalytic activity. The catalytic mechanism revealed that the synergistic effect of hydroxyl groups and reduced sulfur species promoted the formation of 1O2, with a longer lifespan and a longer migration distance, and resisted the influence of nontarget background substances. Moreover, considering the convenience of practical application, the CoSx@LDH@Co-NC-based catalytic membrane was prepared, which had zero discharge of OFX and no decay in continuous operation for 5.0 h. The activity of the catalytic membrane was also verified in actual wastewater. Consequently, this work not only provides a novel strategy for designing excellent catalysts but also is applicable to practical organic wastewater treatment. © 2023 American Chemical Society.

Research Area(s)

  • antibiotic wastewater, catalytic membrane, oxygen-sulfur vacancy, PMS activation, reduced sulfur species

Citation Format(s)

Vacancy-Rich CoSx@LDH@Co-NC Catalytic Membrane for Antibiotic Degradation with Mechanistic Insights. / Zhu, Zhi; Ye, Jian; Tang, Xu et al.
In: Environmental Science and Technology, Vol. 57, No. 42, 24.10.2023, p. 16131–16140.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review