title: Dark ambient degradation of Bisphenol A and Acid Orange 8 as organic pollutants by perovskite SrFeO₃-δ metal oxide.
abstract: Current advanced oxidation processes (AOPs) are chemically and energetically intensive processes, which are undesirable for cost-effective and large-scale system water treatment and wastewater recycling. This study explored the Strontium Ferrite (SFO) metal oxide on the degradation of highly concentrated organic pollutants under dark ambient condition without any external stimulants. The SFO particles with single perovskite structure were successfully synthesized with a combined high temperature and high-energy ball milling process. An endocrine disruptor, Bisphenol A (BPA) and an azo dye, Acid Orange 8 (AO8) were used as probe organic pollutants. BPA was completely degraded with 83% of mineralization in 24 h while rapid decoloration of AO8 was achieved in 60 min and complete breakdown into primary intermediates and aliphatic acids occurred in 24 h under the treatment of dispersed SFO metal oxide in water. Such efficient degradation could be attributed to the enhanced adsorption of these anionic pollutants on positively charged ball-milled SFO metal oxide surface, resulted in higher degradation activity. Preliminary degradation mechanisms of BPA and AO8 under the action of SFO metal oxide were proposed. These results showed that the SFO metal oxide could be an efficient alternative material as novel advanced oxidation technology for low cost water treatment.
authors.affiliation: School of Electrical & Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. LEIW0003@e.ntu.edu.sg
authors.forename: Ming Yian
authors.initials: MY
authors.lastname: Leiw
authors.forename: Guan Hong
authors.initials: GH
authors.lastname: Guai
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Wang
authors.forename: Man Siu
authors.initials: MS
authors.lastname: Tse
authors.forename: Chee Mang
authors.initials: CM
authors.lastname: Ng
authors.forename: Ooi Kiang
authors.initials: OK
authors.lastname: Tan
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D001559:Benzhydryl Compounds / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D002845:Chromatography / Q000379:methods; D004396:Coloring Agents / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010636:Phenols / Q000737:chemistry*; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods*; D000098826:Bisphenol A Compounds
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D001559:Benzhydryl Compounds; D017610:Calcium Compounds; D004396:Coloring Agents; D010087:Oxides; D010100:Oxygen; D010636:Phenols; D014025:Titanium; D014874:Water Pollutants, Chemical; C059910:perovskite; C587444:acid orange 8; C006780:bisphenol A; D000098826:Bisphenol A Compounds
keywords: Acid Orange 8; Advanced oxidation technology; Bisphenol A; Dark degradation; SrFeO(3−δ)