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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Photocatalytic ozonation of phenazopyridine using TiO2 nanoparticles coated on ceramic plates: mechanistic studies, degradation intermediates and ecotoxicological assessments
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Photocatalytic ozonation of phenazopyridine using TiO2 nanoparticles coated on ceramic plates: mechanistic studies, degradation intermediates and ecotoxicological assessments

机译：使用涂覆在陶瓷板上的TiO2纳米粒子对苯并吡啶进行光催化臭氧化：机理研究，降解中间体和生态毒理学评估

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Removal of phenazopyridine (PhP), an analgesic drug, from water with different oxidation processes including photocatalysis, ozonation and photocatalytic ozonation was studied. The experiments were conducted using a semi-batch reactor where TiO2 nanoparticles were immobilized on ceramic plates irradiated by UV-A light in the proximity of oxygen and/or ozone. The surface morphology, topography and roughness of the bare and TiO2-coated ceramic plates were analyzed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Comparing the processes of photocatalysis, ozonation and photocatalytic ozonation revealed that using photocatalytic ozonation led to the highest efficiency (85% at 35 min) in PhP removal. The influence of pH, PhP initial concentration and ozone gas flow rate on the removal of PhP was investigated in both individual and combined processes. The presence of synergy was investigated under various operational parameters. The mechanism of photocatalytic ozonation process was investigated in the presence of various reactive oxygen species (ROS) scavengers. The main intermediate products of PhP produced in ozonation and photocatalytic ozonation processes were verified by the GC MS technique. The chronic phytotoxicity of PhP and its intermediate compounds formed in zonation and photocatalytic ozonation was evaluated using aquatic species Spirodela polyrrhiza (S. polyrrhiza). It was found that the photocatalytic ozonation process, in contrast to the single ozonation process, can efficiently reduce the phytotoxicity of the PhP from aqueous solutions. (C) 2014 Elsevier B.V. All rights reserved.
机译：研究了从水中通过不同的氧化过程（包括光催化，臭氧化和光催化臭氧化）去除苯并吡啶（PhP）的镇痛药。使用半间歇反应器进行实验，其中将TiO 2纳米颗粒固定在氧气和/或臭氧附近的UV-A光照射的陶瓷板上。使用扫描电子显微镜（SEM）和原子力显微镜（AFM）对裸露和TiO2涂层陶瓷板的表面形态，形貌和粗糙度进行了分析。比较光催化，臭氧化和光催化臭氧化的过程，发现使用光催化臭氧化可最大程度地提高PhP去除效率（35分钟时为85％）。在单个过程和联合过程中，都研究了pH，PhP初始浓度和臭氧气体流速对PhP去除的影响。在各种操作参数下研究了协同作用的存在。在各种活性氧（ROS）清除剂的存在下，研究了光催化臭氧化过程的机理。通过气相色谱质谱技术验证了臭氧化和光催化臭氧化过程中产生的PhP的主要中间产物。使用水生物种Spirodela polyrrhiza（S. polyrrhiza）评估了在分区和光催化臭氧化过程中形成的PhP及其中间化合物的慢性植物毒性。已经发现，与单次臭氧化过程相比，光催化臭氧化过程可以有效地降低水溶液中PhP的植物毒性。 （C）2014 Elsevier B.V.保留所有权利。

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