Enhanced sonocatalytic degradation of recalcitrant organic contaminants using a magnetically recoverable Ag/Fe-loaded activated biochar composite

Byung Moon Jun, Yejin Kim, Yeomin Yoon, Yeonji Yea, Chang Min Park

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Silverorthophosphate (Ag3PO4)-iron oxide (Fe3O4)@activated biochar (AB) composite was prepared by a co-precipitation method as a sonocatalyst for the degradation of recalcitrant organic contaminants. We characterized Ag3PO4–Fe3O4@AB to study the physicochemical properties using scanning electron microscopy, porosimetry, a vibrating sample magnetometer, and X-ray photoelectron spectroscopy. The specific surface area increased after loading Ag3PO4–Fe3O4 on AB compared to AB only. The high magnetic property of Ag3PO4–Fe3O4@AB was confirmed by vibrating sample magnetometer analysis, which could be attributed to the existence of Fe3O4. The Ag3PO4–Fe3O4@AB demonstrated excellent sonocatalytic performances for the degradation of rhodamine B (RhB) and bisphenol A (BPA) under an ultrasonic (US) irradiation. Synergetic sonocatalytic activity of Ag3PO4–Fe3O4@AB has been obtained from (i) enhanced pyrolysis conditions of water molecules on the surface of the sonocatalyst through a “hot spot” and (ii) photoinduced separation between electron-hole pairs of Ag3PO4 using sonoluminescence. The predominant active radical species was OH•, which was confirmed by a spin trapping study. The US/Ag3PO4–Fe3O4@AB system demonstrated successful application in the degradation of various organic contaminants including synthetic dyes, endocrine-disrupting compounds/pharmaceutical active chemicals, and chlorinated organic contaminants as well as excellent reusability without a significant loss of sonocatalytic performance.

Original languageEnglish
Pages (from-to)22521-22531
Number of pages11
JournalCeramics International
Volume46
Issue number14
DOIs
StatePublished - 1 Oct 2020

Bibliographical note

Funding Information:
This study was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( NRF-2018R1A6A1A03024962 ) and the Korea Ministry of Environment (The SEM projects; 2018002470005 ).

Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.

Keywords

  • Activated biochar
  • Iron oxide
  • Recalcitrant organic contaminants
  • Silverorthophosphate
  • Sonocatalyst

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