Ozonation Catalyzed by CoxFe1 Layered Double Hydroxide for the Degradation of P-toluenesulfonic Acid. (4th March 2021)

• Record Type: Journal Article
• Authors: Fu, Xiaojie; Huang, Yuanxing; Wang, Yaowei; Liang, Manli; Yang, Ya; Jin, Zhihao; Yang, Junhao; Hu, Shouxun; Li, Liang
• Is Part Of: Ozone: science and engineering. Volume 43:Number 2(2021)
• Page Start: 163
• Page End: 172
• Publication Date: 2021-03-04
• Subjects: Catalytic Ozonation -- EPR -- Layered Double Hydroxide -- Ozone -- p-Toluenesulfonic Acid; Ozone -- Periodicals; 665.89
• DOI: 10.1080/01919512.2020.1766944
• Languages: English
• ISSNs: 0191-9512

Abstract

ABSTRACT: Catalyst of Fe–Co-layered double hydroxide (LDH) prepared by co-precipitation could effectively improve the degradation of pharmaceutical intermediate – p -toluenesulfonic acid ( p -TSA) in the water during ozonation. The experimental results showed that under the condition of pH 7.9, catalyst dosage 0.1 g/L and aqueous ozone concentration 6.2 mg/L, 20 mg/L of p -TSA obtained a TOC removal percentage of 85%. To search for the mechanism of Fe–Co LDH catalytic ozonation and degradation of organic pollutants, hydroxyl radicals were measured with dimethyl sulfoxide (DMSO) and high-performance liquid chromatography (HPLC). The existence of hydroxyl radicals in catalytic ozonation system was also indirectly detected by observing the influence of quenching agents of HCO3 − and PO4 3- on the p -TSA removal. Furthermore, we used electron paramagnetic resonance (EPR) to directly detect the hydroxyl radicals generated during the catalytic ozonation of p -TSA. The experiment results fundamentally revealed the mechanism of catalytic ozonation to degrade organic pollutants.