Mechanism and performance of singlet oxygen dominated peroxymonosulfate activation on CoOOH nanoparticles for 2,4-dichlorophenol degradation in water

Qihui Zhang, Dan He, Xinran Li, Wei Feng, Cong Lyu*, Yifeng Zhang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Peroxymonosulfate (PMS) has gained attention as oxidant for SR-AOPs. It is essential to develop a stable heterogeneous catalyst with strong hydrophilicity and high electron transfer capability for PMS activating. In this study, cobalt oxyhydroxide (CoOOH) was synthesized and activated PMS for degradation of 2,4-dichlorophenol (2,4-DCP) aiming to assess the feasibility of CoOOH/PMS system. 50 mg/L of 2,4-DCP could be 100% degraded within 120 min with 0.20 g/L CoOOH and 6 mM PMS. CoOOH/PMS system possessed a high degradation efficiency (0.0462 min-1), which was about 10 and 4 times higher than Co3O4/PMS and CoFe2O4/PMS system, respectively. Furthermore, it was found that CoOOH/PMS system displayed effective catalytic performance over broad pH range (e.g. 3-9). Importantly, the quenching tests revealed that 1O2 was identified as dominant reactive oxygen species (ROS). Co (Ⅲ) was rapidly reduced to Co (Ⅱ) owing to the efficient electron transfer rate performance of CoOOH in the catalytic reaction. Then, the regeneration of Co (Ⅱ) facilitated CoOH+ owing to the surface of CoOOH with sufficient hydroxyl group, which is crucial for PMS activation and reactive oxygen species-ROS generation. This study proposed an alternative technology based on peroxymonosulfate catalyzed by cobalt-based hydroxide for waste water treatment.
Original languageEnglish
Article number121350
JournalJournal of Hazardous Materials
Volume384
Number of pages8
ISSN0304-3894
DOIs
Publication statusPublished - 2020

Keywords

  • CoOOH
  • Sulfate radical
  • Singlet oxygen
  • Surface hydroxyl density
  • Electron transfer

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