The Effect of Magnetic Composites (γ-Al 2 O 3 /TiO 2 /γ-Fe 2 O 3 ) as Ozone Catalysts in Wastewater Treatment

• Published in: Materials Vol. 15; no. 23; p. 8459
• Main Authors: Wang, Cheng, Zhou, Guangzhen, Xu, Yanhua, Yu, Peng
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 28.11.2022; MDPI
• Subjects: advanced oxidation technology; Air pollution; Aluminum; Aluminum oxide; Ammonia; Analysis; Benzoic acid; Bisphenol A; Catalysts; Catalytic activity; Catalytic oxidation; Chloride; Coupling (molecular); Coupling agents; Degradation; Efficiency; Ibuprofen; magnetic catalysts; Magnetic properties; Metal oxides; Mineralization; Organic acids; Organic matter; Oxidation; Ozone; ozone catalysts; Particle size; Phenylacetaldehyde; Phenylacetic acid; Pollutants; Precious metals; Purification; Reagents; Scanning electron microscopy; Sewage; Spectrum analysis; Substrates; Titanium dioxide; Transitional aluminas; Wastewater treatment; Water reclamation; Water resources; Water sampling; Water treatment; United States > US; China; advanced oxidation technology; ozone catalysts; magnetic catalysts; wastewater treatment
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma15238459

Using municipal sewage as a source of reclaimed water is an important way to alleviate the shortage of water resources. At present, advanced oxidation technology (AOPs), represented by ozone oxidation, is widely used in wastewater treatment. In this study, γ-Al O , a low-cost traditional ozone catalyst, was selected as the matrix. By modifying magnetic γ-Fe O with a titanate coupling agent, in situ deposition, and calcination, the final formation of a γ-Al O /TiO /γ-Fe O micrometer ozone catalyst was achieved. A variety of material characterization methods were used to demonstrate that the required material was successfully prepared. The catalyst powder particles have strong magnetic properties, form aggregates easily, and have good precipitation and separation properties. Subsequently, ibuprofen was used as the degradation substrate to investigate the ozone catalytic performance of the prepared catalyst, and this proved that it had good ozone catalytic activity. The degradation process was also analyzed. The results showed that in the ozone system, some of the ibuprofen molecules will be oxidized to form 1,4-propanal phenylacetic acid, which is then further oxidized to form 1,4-acetaldehyde benzoic acid and p-phenylacetaldehyde. Finally, the prepared catalyst was applied to the actual wastewater treatment process, and it also had good catalytic performance in this context. GC-MS detection of the water samples after treatment showed that the types of organic matter in the water were significantly reduced, among which nine pollutants with high content, such as bisphenol A and sulfamethoxazole, were not detected after treatment.