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Enhanced photocatalytic reduction of Cr(VI) in aqueous solution by UV/TiO2 process in the presence of Fe(III): Performance, kinetic, and mechanisms
Chemical Engineering and Processing: Process Intensification ( IF 4.3 ) Pub Date : 2022-09-08 , DOI: 10.1016/j.cep.2022.109135
Giang KT Luong , Young Ku

Photocatalytic reduction of Cr(VI) in aqueous solution was investigated using fabricated TiO2 film under UV irradiation with the presence of Fe(III). Effects of solution pH, UV light intensity, initial concentrations of Cr(VI) and Fe(III), and competitive inorganic ions on Cr(VI) photoreduction efficiency were discussed in this study. The presence of Fe(III) promoted the photoreduction of Cr(VI) by 34% in acidic medium through the Fe(III)/Fe(II) redox cycle. The Cr(VI) reduction rate was two times higher than that with the absence of Fe(III) in aqueous solution. Furthermore, the photonic efficiency was significantly promoted for experiments conducted with decreasing light intensity due to the inhibition of charge carrier recombination. A dual-site kinetic model based on the Langmuir-Hinshelwood mechanism for Cr(VI) photoreduction by UV/TiO2/Fe(III) process is first proposed and well fitted with the experiment data.



中文翻译:

在 Fe(III) 存在下通过 UV/TiO2 工艺增强水溶液中 Cr(VI) 的光催化还原:性能、动力学和机制

使用制备的TiO 2研究了水溶液中Cr(VI)的光催化还原在存在 Fe(III) 的紫外线照射下的薄膜。本研究讨论了溶液 pH 值、紫外光强度、Cr(VI) 和 Fe(III) 初始浓度以及竞争性无机离子对 Cr(VI) 光还原效率的影响。Fe(III) 的存在通过 Fe(III)/Fe(II) 氧化还原循环促进了 Cr(VI) 在酸性介质中的 34% 的光还原。Cr(VI) 的还原率是在水溶液中不存在 Fe(III) 时的两倍。此外,由于电荷载流子复合的抑制,在光强度降低的情况下进行的实验显着提高了光子效率。基于 Langmuir-Hinshelwood 机理的 UV/TiO 2光还原 Cr(VI) 双位点动力学模型/Fe(III) 工艺是首次提出并与实验数据吻合良好。

更新日期:2022-09-08
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