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Improved degradation of etodolac in the presence of core-shell ZnFe2O4/SiO2/TiO2 magnetic photocatalyst.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-28 , DOI: 10.1016/j.scitotenv.2020.138167 Eryka Mrotek 1 , Szymon Dudziak 1 , Izabela Malinowska 1 , Daniel Pelczarski 2 , Zuzanna Ryżyńska 3 , Anna Zielińska-Jurek 1
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-28 , DOI: 10.1016/j.scitotenv.2020.138167 Eryka Mrotek 1 , Szymon Dudziak 1 , Izabela Malinowska 1 , Daniel Pelczarski 2 , Zuzanna Ryżyńska 3 , Anna Zielińska-Jurek 1
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In the present study, susceptibility to photocatalytic degradation of etodolac, 1,8-diethyl-1,3,4,9 - tetrahydro pyran - [3,4-b] indole-1-acetic acid, which is a non-steroidal anti-inflammatory drug frequently detected in an aqueous environment, was for the first time investigated. The obtained p-type TiO2-based photocatalyst coupled with zinc ferrite nanoparticles in a core-shell structure improves the separation and recovery of nanosized TiO2 photocatalyst. The characterization of ZnFe2O4/SiO2/TiO2, including XRD, XPS, TEM, BET, DR/UV-Vis, impedance spectroscopy and photocatalytic analysis, showed that magnetic photocatalyst containing anatase phase revealed markedly improved etodolac decomposition and mineralization measured as TOC removal compared to photolysis reaction. The effect of irradiation and pH range on photocatalytic decomposition of etodolac was studied. The most efficient degradation of etodolac was observed under simulated solar light for a core-shell ZnFe2O4/SiO2/TiO2 magnetic photocatalyst at pH above 4 (pKa = 4.7) and below 7. The irradiation of etodolac solution in a broader light range revealed a synergetic effect on its photodegradation performance. After only 20 min of degradation, about 100% of etodolac was degraded. Based on the photocatalytic analysis in the presence of scavengers and HPLC analysis, the transformation intermediates and possible photodegradation pathways of etodolac were studied. It was found that ∙O2- attack on C2-C3 bond inside pyrrole ring results mostly in the hydroxylation of the molecule, which next undergoes -CH2COOH detachment to give 1,9-diethyl-3,4-dihydro-pyrano[3,4-b]indol-4a-ol. The obtained compound should further undergo subsequent hydropyran and pyrrole ring breaking to give a family of benzene derivatives.
中文翻译：
在核壳型ZnFe2O4 / SiO2 / TiO2磁性光催化剂的存在下改善了依托度酸的降解。
在本研究中，对光催化降解依托度酸，1,8-二乙基-1,3,4,9-四氢吡喃-[3,4-b]吲哚-1-乙酸的敏感性，这是一种非甾体类抗首次在水性环境中检测到的炎症药物被首次研究。所获得的p型TiO2基光催化剂与铁氧体锌纳米颗粒的核-壳结构偶联改善了纳米TiO2光催化剂的分离和回收率。ZnFe2O4 / SiO2 / TiO2的表征，包括XRD，XPS，TEM，BET，DR / UV-Vis，阻抗谱和光催化分析，表明与锐钛矿相比较，含有锐钛矿相的磁性光催化剂显着改善了依托度酸的分解和矿化。光解反应。研究了辐照度和pH值范围对依托度酸光催化分解的影响。在pH高于4（pKa = 4.7）和低于7的核壳型ZnFe2O4 / SiO2 / TiO2磁性光催化剂下，在模拟太阳光下观察到最有效的依托度酸降解。在更宽的光范围内照射依托度酸溶液具有协同作用影响其光降解性能。降解仅20分钟后，约100％的依托度酸被降解。基于清除剂存在下的光催化分析和HPLC分析，研究了依托度酸的转化中间体和可能的光降解途径。发现∙O2-攻击吡咯环内部的C2-C3键，主要导致分子的羟基化，然后进行-CH2COOH分离，生成1,9-二乙基-3,4-二氢-吡喃基[3，4-b]吲哚-4a-ol。所得化合物应进一步进行随后的氢吡喃和吡咯环断裂，以得到一族苯衍生物。
更新日期：2020-03-28
中文翻译：
在核壳型ZnFe2O4 / SiO2 / TiO2磁性光催化剂的存在下改善了依托度酸的降解。
在本研究中，对光催化降解依托度酸，1,8-二乙基-1,3,4,9-四氢吡喃-[3,4-b]吲哚-1-乙酸的敏感性，这是一种非甾体类抗首次在水性环境中检测到的炎症药物被首次研究。所获得的p型TiO2基光催化剂与铁氧体锌纳米颗粒的核-壳结构偶联改善了纳米TiO2光催化剂的分离和回收率。ZnFe2O4 / SiO2 / TiO2的表征，包括XRD，XPS，TEM，BET，DR / UV-Vis，阻抗谱和光催化分析，表明与锐钛矿相比较，含有锐钛矿相的磁性光催化剂显着改善了依托度酸的分解和矿化。光解反应。研究了辐照度和pH值范围对依托度酸光催化分解的影响。在pH高于4（pKa = 4.7）和低于7的核壳型ZnFe2O4 / SiO2 / TiO2磁性光催化剂下，在模拟太阳光下观察到最有效的依托度酸降解。在更宽的光范围内照射依托度酸溶液具有协同作用影响其光降解性能。降解仅20分钟后，约100％的依托度酸被降解。基于清除剂存在下的光催化分析和HPLC分析，研究了依托度酸的转化中间体和可能的光降解途径。发现∙O2-攻击吡咯环内部的C2-C3键，主要导致分子的羟基化，然后进行-CH2COOH分离，生成1,9-二乙基-3,4-二氢-吡喃基[3，4-b]吲哚-4a-ol。所得化合物应进一步进行随后的氢吡喃和吡咯环断裂，以得到一族苯衍生物。
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