Dark ambient degradation of Bisphenol A and Acid Orange 8 as organic pollutants by perovskite SrFeO3−δ metal oxide

• Published in: Journal of hazardous materials 2013-09, Vol.260, p.1-8
• Main Authors: Leiw, Ming Yian, Guai, Guan Hong, Wang, Xiaoping, Tse, Man Siu, Ng, Chee Mang, Tan, Ooi Kiang
• Format: Article
• Language: English
• Subjects: Acid Orange 8; Adsorption; Advanced oxidation technology; Applied sciences; Azo Compounds - chemistry; Ball milling; Benzenesulfonates - chemistry; Benzhydryl Compounds - chemistry; Bisphenol A; Calcium Compounds - chemistry; Chemical engineering; Chromatography - methods; Coloring Agents - chemistry; Dark degradation; Degradation; Dyes; Exact sciences and technology; General purification processes; Grinding; Metal oxides; Oxidation; Oxidation-Reduction; Oxides - chemistry; Oxygen - chemistry; Phenols - chemistry; Pollutants; Pollution; Reactors; Solid-solid systems; SrFeO3−δ; Surface chemistry; Time Factors; Titanium - chemistry; Waste Disposal, Fluid - methods; Wastewaters; Water Pollutants, Chemical; Water Purification - methods; Water treatment and pollution
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2013.04.031

•Perovskite SFO prepared by high temperature and high-energy ball milling process.•SFO metal oxide shows good efficiency in degrading and mineralizing BPA.•Rapid decoloration of AO8 was achieved in the presence of SFO metal oxide.•O2− is the predominant ROS for dark oxidative degradation of BPA and AO8. 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 24h while rapid decoloration of AO8 was achieved in 60min and complete breakdown into primary intermediates and aliphatic acids occurred in 24h 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.