article · Advanced Sustainable Systems
Sulfate radical-based advanced oxidation processes offer strong mineralisation capabilities for environmental remediation. Although cobalt-based semiconductors activate persulfate effectively, practical applications remain constrained by metal leaching and the depletion of catalytic active sites. To address these issues, two catalyst systems, an insulator-supported layered double hydroxide on calcium carbonate and a brownmillerite double-layered perovskite, were synthesised via solid-state methods. Both systems were evaluated for persulfate activation under visible light to degrade the antibiotic amoxicillin. The supported layered double hydroxide system demonstrated superior performance, achieving a 17.9 percent higher reaction rate and greater total organic carbon mineralisation efficacy than the perovskite. Analysis revealed that while both setups generate sulfate and hydroxyl radicals, they drive amoxicillin breakdown through distinct chemical pathways.
Pharmaceutical residues such as amoxicillin in wastewater present serious threats to public health and aquatic ecosystems. Developing durable, visible-light-activated catalysts that do not suffer from metal leaching or site degradation is essential for effective water treatment. By offering stable catalyst architectures, this research advances methods for completely breaking down persistent medicinal contaminants in water supplies.
This work points towards applications in advanced water treatment systems, specifically targeting industrial or municipal facilities processing pharmaceutical contaminants. Potential users include water utilities and environmental engineering companies. The technology appears to be at an early stage of laboratory research, having demonstrated proof of concept in benchtop degradation tests, meaning substantial process optimisation and scale-up testing will be necessary before commercial deployment.
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Abstract Sulfate radicals based advanced oxidation processes (SR‐AOPs) have gained attention recently due to their high mineralization capability in environmental remediation. The high persulfate (PS) activation activity of cobalt‐based semiconductors has epitomized them as preferred catalysts for SR‐AOPs but shortcomings such as leaching, and loss of catalytic active sites limit their applicability. Herein, two different strategies are employed to minimize leaching and improve charge transportation and separation for efficient PS activation under visible light irradiation using LDH/CaCO 3 /PS and Ba 2 CoMnO 5 /PS AOP systems synthesized by solid state method. LDH/CaCO 3 /PS achieved 17.9% higher reaction rate than Ba 2 CoMnO 5 /PS for degradation of amoxicillin (AMX) with higher TOC mineralization efficacy. Despite SO 4 •− and OH • existence and involvement in both systems, the degradation pathways mapped from QTOF‐HPLC‐MS data demonstrated formation of different pathways during AMX mineralization. This work demonstrates novel fabrication of brownmillerite double layered perovskite and insulator supported LDH for environmental pollution remediation.
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DOI: 10.1002/adsu.202400434
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