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Microwave-assisted sol-gel synthesis of an Au-TiO2 photoanode for the advanced oxidation of paracetamol as model pharmaceutical pollutant
Electrochemistry Communications ( IF 4.7 ) Pub Date : 2018-09-18 , DOI: 10.1016/j.elecom.2018.09.009
Rafael Hernández , Isidoro Olvera-Rodríguez , Carlos Guzmán , Alejandro Medel , Luis Escobar-Alarcón , Enric Brillas , Ignasi Sirés , Karen Esquivel

An Au-TiO2 photoanode on carbon cloth has been synthesized by microwave-assisted sol-gel method to treat paracetamol solutions at pH 3.0 by photocatalysis (PC), electro-oxidation (EO), photoelectrocatalysis with UVA light (PEC), solar PEC (SPEC) and hybrid methods with photoelectro-Fenton under UVA (PEC + PEF) and sunlight (SPEC + SPEF) irradiation at constant anodic potential (Ean). The photoanode has been characterized by XRD, Raman spectroscopy, HRTEM and SEM-EDS. The counter electrode was a 316L stainless steel plate, which was replaced by an air-diffusion electrode for H2O2 generation in hybrid treatments. The most powerful process was SPEC + SPEF, yielding total paracetamol removal in <30 min and 24% mineralization after 180 min, at Ean = +0.82 V. The paracetamol decay followed a pseudo-first-order kinetics in PEC. A lower rate constant was obtained upon increase of pharmaceutical concentration, showing good linear fit using a Langmuir-Hinshelwood model.



中文翻译:

微波溶胶-凝胶法合成Au-TiO 2光阳极,用于扑热息痛的模型药物污染物的高级氧化

通过微波辅助溶胶-凝胶法合成了碳布上的Au-TiO 2光阳极,通过光催化(PC),电氧化(EO),UVA光(PEC),太阳能PEC对pH为3.0的扑热息痛溶液进行处理。 (SPEC)和在紫外光(PEC + PEF)和日光(SPEC + SPEF)照射下在恒定阳极电势(E an)下用光电Fenton混合的方法。通过XRD,拉曼光谱,HRTEM和SEM-EDS对光电阳极进行了表征。对电极是316L不锈钢板,由用于H 2 O 2的空气扩散电极代替混合疗法的一代。最有效的过程是SPEC + SPEF,在E an  = +0.82 V时,在<30分钟内去除了全部扑热息痛,并在180分钟后矿化了24%。扑热息痛的降解遵循PEC中的拟一级动力学。当药物浓度增加时,获得较低的速率常数,使用Langmuir-Hinshelwood模型显示出良好的线性拟合。

更新日期:2018-09-18
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