Fe-Mn doped powdered activated carbon pellet as ozone catalyst for cost-effective phenolic wastewater treatment: Mechanism studies and phenol by-products elimination

A novel bimetallic doped PAC (Fe-Mn/PAC) pellet was prepared with a facile sol-gel method and used as an ozone catalyst for phenolic wastewater (PWW) treatment. Adoption of Fe-Mn/PAC pellet in microbubble ozonation enhanced the 1-h chemical oxygen demand (COD) and phenol removal in PWW to 79% and 95...

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Bibliographic Details
Published in:Journal of hazardous materials 2022-02, Vol.424 (Pt B), p.127483-127483, Article 127483
Main Authors: Jothinathan, L., Cai, Q.Q., Ong, S.L., Hu, J.Y.
Format: Article
Language:English
Subjects:
Catalysis
Charcoal
Cost-Benefit Analysis
Fe-Mn bimetallic
Microbubble-catalytic ozonation
Ozone
Ozone decomposition
Phenol
Phenolic wastewater
Powdered activated carbon
Powders
Spectroscopy, Fourier Transform Infrared
Waste Water
Water Pollutants, Chemical - analysis
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Summary:A novel bimetallic doped PAC (Fe-Mn/PAC) pellet was prepared with a facile sol-gel method and used as an ozone catalyst for phenolic wastewater (PWW) treatment. Adoption of Fe-Mn/PAC pellet in microbubble ozonation enhanced the 1-h chemical oxygen demand (COD) and phenol removal in PWW to 79% and 95%, respectively. With ozone dosage of 10 mg/L, 1 g/L Fe-Mn/PAC pellet exhibited ozone conversion of 92%. In comparison to microbubble ozonation process, Fe-Mn/PAC induced microbubble-catalytic ozonation process promoted ozone decomposition rate by 1.9 times. In terms of •OH production, Fe-Mn/PAC pellet enhanced •OH exposure by 10 times, with a Rct value of 2.92 × 10 -8. Rct kinetic model also suggested that Fe-Mn/PAC pellet obtained higher kinetic rate constants for initiating and promoting •OH generation. Usage of Fe-Mn/PAC pellet in microbubble ozonation for phenolic wastewater treatment also reduced the total ozone consumption by 70%. In Fe-Mn/PAC induced microbubble-catalytic ozonation process, the ratio between ozone consumption and COD removal (ΔO3/ΔCOD) was 0.91. Fe-Mn/PAC pellet characterization with X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR) and X-ray powder diffraction (XRD) analysis revealed successful doping of Fe-Mn on PAC substrate and larger numbers of carbon-oxygen/hydroxyl surface groups, which played key roles in ozone decomposition and •OH production. [Display omitted] •Fe-Mn/PAC pellet obtained larger amount of C-O/-OH surface groups.•Fe-Mn/PAC pellet promoted ozone decomposition and •OH exposure by 1.9 and 10 times.•Catalyst kinetic performance for •OH production was determined with Rct modelling.•Fe-Mn/PAC reduced ozone consumption in PWW treatment by 70% with ΔO3/ΔCOD of 0.91.•Fe-Mn/PAC pellet posed stable long-term performance with 74% COD removal in PWW.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2021.127483