School of Electrical & Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
J Hazard Mater. 2013 Sep 15;260:1-8. doi: 10.1016/j.jhazmat.2013.04.031. Epub 2013 Apr 29.
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.
当前的高级氧化工艺（AOPs）是化学和能量密集型过程，对于具有成本效益和大规模系统的水处理和废水再循环而言并不理想。本研究探索了锶铁氧体（SFO）金属氧化物在暗环境条件下无需任何外部刺激即可降解高浓度有机污染物的能力。采用高温和高能球磨工艺成功合成了具有单一钙钛矿结构的 SFO 颗粒。以一种内分泌干扰物双酚 A（BPA）和一种偶氮染料酸性橙 8（AO8）作为探针有机污染物。BPA 在 24 小时内完全降解，矿化率达到 83%，而 AO8 在 60 分钟内迅速脱色，在水中分散的 SFO 金属氧化物处理 24 小时后完全分解为初级中间产物和脂肪酸。如此高效的降解归因于这些阴离子污染物在经过球磨的带正电荷的 SFO 金属氧化物表面上的增强吸附，从而导致更高的降解活性。提出了 SFO 金属氧化物作用下 BPA 和 AO8 的初步降解机制。这些结果表明，SFO 金属氧化物可以作为一种高效的替代材料，作为新型的低成本水处理高级氧化技术。
