School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, PR China.
Department of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
Environ Pollut. 2021 Jan 1;268(Pt A):115722. doi: 10.1016/j.envpol.2020.115722. Epub 2020 Sep 28.
The search for optimal catalysts to improve the working efficiency of ozonation has always been an important issue in the research field of advanced oxidation processes. In this study, a novel catalyst, ferrosilicon, was selected as the catalyst in heterogeneous catalytic ozonation to degrade ibuprofen (IBP) in water and treat real pharmaceutical wastewater. During the procedure, 45ferrosilicon exhibited the best catalytic activity. Under the optimized experimental conditions, the IBP removal reached 75%, which was a great improvement compared to the 37% removal by ozone alone. The 45-ferrosilicon-catalysed ozonation also achieved 68% TOC removal for real pharmaceutical wastewater, which was 31% higher than that by ozone alone. The degradation pathway of IBP was proposed using GC/MS. The EPR test proved that the main active species in the system were free active radicals •OH, and the measured accumulative •OH amount was 102 μmol. The characterization results show that the nascent metallic oxides, hydroxides, and hydroxyoxides on the ferrosilicon surface facilitated the decomposition of ozone molecules and generation of free active radicals. The removal of target organic contaminants in the water was mainly attributed to the oxidization of these highly active species.
寻找能提高臭氧氧化工作效率的最佳催化剂一直是高级氧化工艺研究领域的一个重要问题。在这项研究中，选择硅铁作为多相催化臭氧化的催化剂，以降解水中的布洛芬（IBP）并处理实际的医药废水。在实验过程中，45 硅铁表现出最好的催化活性。在最佳实验条件下，IBP 的去除率达到 75%，比单独使用臭氧的 37%有了很大的提高。45 硅铁催化臭氧化对实际医药废水的TOC 去除率也达到了 68%，比单独使用臭氧时高出 31%。通过 GC/MS 提出了 IBP 的降解途径。EPR 测试证明，体系中的主要活性物质是游离的活性自由基·OH，测得的累积·OH 量为 102µmol。表征结果表明，硅铁表面新生的金属氧化物、氢氧化物和羟基氧化物促进了臭氧分子的分解和游离活性自由基的生成。水中目标有机污染物的去除主要归因于这些高活性物质的氧化作用。
