Synthesis of magnetic recoverable catalyst to enhance visible light photo-fenton performance for organic contaminant degradation

Name: Athaphon Angkaew

LCSH: Kasetsart University -- Dissertations. Ph.D. (Environmental Technology and Management) 2022

Classification :.LCCS: TD758.5.O75

LCSH: Kasetsart University. -- Department of Environmental Technology and Management -- Dissertations

LCSH: Sewage -- Purification -- Organic compounds removal

LCSH: Nanoparticles

LCSH: Catalysts -- Recycling

Abstract: Interest in using various nanoparticle catalysts to activate H2O2 with light for organic contaminant and wastewater treatment is steadily increasing. This work aims to develop an efficient and environmentally-friendly catalytic system for removing organic pollutants in water. In this study, magnetically recoverable MnFe2O4/g-C3N4 and Cu0.5Mn0.5Fe2O4 nanoparticles, which were successfully synthesized by co-precipitation and calcination methods, were applied as heterogeneous catalysts for H2O2 activation under simulated sunlight irradiation. Material characterization revealed that melamine and composing g-C3N4 in the composites acted as a coordinating agent during the calcination process that promoted a ferrite structure. Both MnFe2O4/g-C3N4 and Cu0.5Mn0.5Fe2O4 nanoparticles showed remarkable photo-Fenton catalytic ability in a wide pH range (5-9) and high stability for many cycle applications. Using methylene blue (MB) and oxytetracycline (OTC) as surrogate wastewater constituents, we found that the hydroxyl radical (•OH), superoxide anions (•O2 - ), and singlet oxygen (1O2) were the active radical species involved in the degradation. Cu0.5Mn0.5Fe2O4 nanoparticles showed outstanding catalytic performance on several organic contaminants (87.6% - 100.0% removal within 2 h). In a pilot-scale experiment (10 L), we provide proof that our rigorous treatment system was able to remove remnant OTC, TOC, and also any available colloidal particles to only 1 NTU. Ecotoxicity studies using an aquatic plant (Hydrilla verticillata) and zooplankton revealed that treated water could be reused in various ratios. And at 5% of treated water, rapid leaf recovery and a significant increase in rotifer numbers were reported. These observations support the use of MnFe2O4/gC3N4 and Cu0.5Mn0.5Fe2O4 nanoparticles as potential photocatalysts to activate H2O2 for the treatment of organic contaminants and a radical generating mechanism is proposed.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Chanat Chokejaroenrat

Role: Thesis Advisor

Name: Chainarong Sakulthaew

Role: Thesis CO-Advisor

Created: 2022

Modified: 2025-07-27

Issued: 2025-07-27

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2565/athaphon-ang-all.pdf

CallNumber: TD758.5.O75 .A83

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degraee

Descipline: Environmental Technology and Management

Grantor: Kasetsart University

©copyrights Kasetsart University

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