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超声、光催化和光芬顿反应协同对偶氮染料的脱色作用。

Synergetic decolorization of azo dyes using ultrasounds, photocatalysis and photo-fenton reaction.

机构信息

School of Chemical Engineering, National Technical University of Athens, 9 Heroon Polytechneiou St., Zografou Campus, 15780 Athens, Greece.

Clausthal Centre for Materials Technology (CZM), Clausthal University of Technology, Leibnizstr. 9, 38678 Clausthal-Zellerfeld, Germany.

出版信息

Ultrason Sonochem. 2021 Mar;71:105367. doi: 10.1016/j.ultsonch.2020.105367. Epub 2020 Oct 20.

DOI:10.1016/j.ultsonch.2020.105367
PMID:33125964
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7786534/
Abstract

In the present work, ultrasound irradiation, photocatalysis with TiO, Fenton/Photo-Fenton reaction, and the combination of those techniques were investigated for the decolorization of industrial dyes in order to study their synergy. Three azo dyes were selected from the weaving industry. Their degradation was examined via UV illumination, Fenton and Photo-Fenton reaction as well as ultrasound irradiation at low (20 kHz) and high frequencies (860 kHz). In these experiments, we investigated the simultaneous action of the ultrasound and UV irradiation by varying parameters like the duration of photocatalysis and ultrasound irradiation frequency. At the same time, US power, temperature, amount of TiO photocatalyst and amount of Fenton reagent remained constant. Due to their diverse structure, each azo dye showed different degradation levels using different combinations of the above-mentioned Advanced Oxidation Processes (AOPs). The Photo-Fenton reagent is more effective with US 20 kHz and US 860 kHz for the azo dyes originated from the weaving industry at pH = 3 as compared to pH = 6.8. The combination of the Photo-Fenton reaction with 860 kHz ultrasound irradiation for the same dye gave an 80% conversion at the same time. Experiments have shown a high activity during the first two hours. After that threshold, the reaction rate is decreased. FT-IR and TOC measurements prove the decolorization due to the destruction of the chromophore groups but not complete mineralization of the dyes.

摘要

在本工作中，研究了超声辐射、TiO2 光催化、Fenton/Photo-Fenton 反应以及这些技术的组合，以研究它们的协同作用，用于工业染料的脱色。从纺织工业中选择了三种偶氮染料。通过紫外光照射、Fenton 和 Photo-Fenton 反应以及低频（20 kHz）和高频（860 kHz）超声辐射来检查它们的降解。在这些实验中，我们通过改变光催化和超声辐射频率的持续时间等参数来研究超声和紫外光辐射的协同作用。同时，US 功率、温度、TiO2 光催化剂的用量和 Fenton 试剂的用量保持不变。由于它们的结构不同，每种偶氮染料在不同的高级氧化工艺（AOPs）组合下表现出不同的降解水平。Photo-Fenton 试剂在 pH = 3 时对来自纺织工业的偶氮染料在 US 20 kHz 和 US 860 kHz 下比在 pH = 6.8 时更有效。对于同一种染料，将 Photo-Fenton 反应与 860 kHz 超声辐射相结合，在相同时间内可达到 80%的转化率。实验表明在前两个小时内具有很高的活性。超过该阈值后，反应速率降低。FT-IR 和 TOC 测量证明了由于发色团的破坏而导致的脱色，但染料并未完全矿化。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/18ca/7786534/e601c8c247a0/gr11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/18ca/7786534/15748b40adfd/gr12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/18ca/7786534/abdb7d9a9117/gr13.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/18ca/7786534/b87525c44292/gr14.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/18ca/7786534/374ce9c7d5a4/gr18.jpg

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