Nica Angel-Vasile, Olaru Elena Alina, Bradu Corina, Dumitru Anca, Avramescu Sorin Marius
PROTMED Research Centre, University of Bucharest, Splaiul Independenţei 91-95, Sect. 5, 050107 Bucharest, Romania.
Department of Systems Ecology and Sustainability, Faculty of Biology, University of Bucharest, Splaiul Independenţei 91-95, 050095 Bucharest, Romania.
Nanomaterials (Basel). 2022 Oct 4;12(19):3468. doi: 10.3390/nano12193468.
Catalytic ozonation is an important water treatment method among advanced oxidation processes (AOPs). Since the first development, catalytic ozonation has been consistently improved in terms of catalysts used and the optimization of operational parameters. The aim of this work is to compare the catalytic activity of polyaniline (PANI) and thermally treated polyaniline (PANI 900) in the catalytic ozonation of ibuprofen solutions at different pH values (4, 7, and 10). Catalysts were thoroughly characterized through multiple techniques (SEM, Raman spectroscopy, XPS, pHPZC, and so on), while the oxidation process of ibuprofen solutions (100 mgL) was assessed by several analytical methods (HPLC, UV254, TOC, COD, and BOD5). The experimental data demonstrate a significant improvement in ibuprofen removal in the presence of prepared solids (20 min for PANI 900 at pH10) compared with non-catalytic processes (56 min at pH 10). Moreover, the influence of solution pH was emphasized, showing that, in the basic region, the removal rate of organic substrate is higher than in acidic or neutral range. Ozone consumption mgO/mg ibuprofen was considerably reduced for catalytic processes (17.55-PANI, 11.18-PANI 900) compared with the absence of catalysts (29.64). Hence, beside the ibuprofen degradation, the catalysts used are very active in the mineralization of organic substrate and/or formation of biodegradable compounds. The best removal rate of target pollutants and oxidation by-products was achieved by PANI 900, although raw polyaniline also presents important activity in the oxidation process. Therefore, it can be stated that polyaniline-based catalysts are effective in the oxidation processes.
催化臭氧化是高级氧化工艺（AOPs）中一种重要的水处理方法。自首次开发以来，催化臭氧化在所用催化剂和操作参数优化方面不断改进。本工作的目的是比较聚苯胺（PANI）和热处理聚苯胺（PANI 900）在不同pH值（4、7和10）下对布洛芬溶液催化臭氧化的催化活性。通过多种技术（扫描电子显微镜、拉曼光谱、X射线光电子能谱、零电荷点等）对催化剂进行了全面表征，同时采用多种分析方法（高效液相色谱、UV254、总有机碳、化学需氧量和生化需氧量）评估了布洛芬溶液（100 mg/L）的氧化过程。实验数据表明，与非催化过程（pH 10时为56分钟）相比，在存在制备的固体（pH 10时PANI 900为20分钟）的情况下，布洛芬的去除率有显著提高。此外，强调了溶液pH的影响，表明在碱性区域，有机底物的去除率高于酸性或中性范围。与无催化剂时（29.64）相比，催化过程（17.55 - PANI，11.18 - PANI 900）的臭氧消耗量（mgO/mg布洛芬）大幅降低。因此，除了布洛芬降解外，所用催化剂在有机底物矿化和/或可生物降解化合物形成方面非常活跃。尽管未处理的聚苯胺在氧化过程中也表现出重要活性，但PANI 900实现了目标污染物和氧化副产物的最佳去除率。因此，可以说聚苯胺基催化剂在氧化过程中是有效的。
