School of Environmental and Chemical Engineering, Tianjin Polytechnic University, China.
School of Environmental and Chemical Engineering, Tianjin Polytechnic University, China.
J Hazard Mater. 2018 Aug 15;356:53-60. doi: 10.1016/j.jhazmat.2018.05.044. Epub 2018 May 23.
Removal of toxic organics and bacterial disinfection are important tasks in wastewater treatment. Most heavy metal-based catalysts for degradation of aqueous organic pollutants in heterogeneous Fenton-like processes suffer from the toxicity of leached metals. The present work reports environmentally benign systems for both degradation of organics and bacterial disinfection. Calcium substituted LaFeO perovskite was demonstrated as an efficient catalyst to activate peroxymonosulfate (PMS) for degradation of phenol, methylene blue and rhodamine 6 G. Compared to LaFeO and nanocrystal FeO, the lattice oxygen vacancies in B-site cation-deficient perovskite of LaCaFeO- (LaCaFeO) particles renders this material a greatly improved catalytic performance. Electron paramagnetic resonance (EPR) suggested that both sulfate (SO-) and hydroxyl radicals (OH) played critical roles in the advanced oxidation processes. Moreover, silver doped perovskite (Ag-LaCaFeO)/PMS successfully inhibited the growth of waterborne pathogen Escherichia coli and Methicillin-resistant Staphylococcus aureus (MRSA) at a lower dose than silver ions, proving a synergetic effect between free radicals and Ag in killing the bacteria. Therefore, Ag-LaCaFeO/PMS would be promising for practical wastewater treatment.
去除有毒有机物和细菌消毒是废水处理中的重要任务。大多数用于非均相类芬顿过程中降解水中有机污染物的重金属基催化剂都受到浸出金属毒性的影响。本工作报道了用于有机物降解和细菌消毒的环境友好型系统。钙取代的 LaFeO 钙钛矿被证明是一种有效的催化剂，可用于激活过一硫酸盐（PMS）以降解苯酚、亚甲基蓝和罗丹明 6G。与 LaFeO 和纳米晶 FeO 相比，B 位阳离子缺陷钙钛矿 LaCaFeO-（LaCaFeO）颗粒中的晶格氧空位使该材料具有大大提高的催化性能。电子顺磁共振（EPR）表明，硫酸根（SO-）和羟基自由基（OH）在高级氧化过程中都起着关键作用。此外，银掺杂钙钛矿（Ag-LaCaFeO）/PMS 在低于银离子的剂量下成功抑制了水生病原体大肠杆菌和耐甲氧西林金黄色葡萄球菌（MRSA）的生长，证明了自由基和 Ag 在杀死细菌方面的协同作用。因此，Ag-LaCaFeO/PMS 在实际废水处理中具有广阔的应用前景。
