Azurobine degradation using Fe2O3@multi-walled carbon nanotube activated peroxymonosulfate (PMS) under UVA-LED irradiation: performance, mechanism and environmental application
Azurobine degradation using Fe2O3@multi-walled carbon nanotube activated peroxymonosulfate (PMS) under UVA-LED irradiation: performance, mechanism and environmental application
复制标题
DOI：
10.1016/j.jece.2021.106660
复制
发表时间：
2021-11-30
影响因子：
7.7
通讯作者：
Hassani, Aydin
中科院分区：
文献类型：
--
作者：
Madihi-Bidgoli, Soheila;Asadnezhad, Sahar;Hassani, Aydin
食用染料是一类广泛应用于食品工业的染料。它们在水生介质中的存在导致水污染。采用非均相光助过一硫酸盐（PMS）活化法降解偶氮玉红（AZB）。制备了负载Fe 2 O3的多壁碳纳米管（Fe@MWCNT），并将其用于UVA-LED照射下的PMS活化。采用XRD、FTIR、EDX-map、BET、FESEM和TEM等手段对Fe@MWCNT催化剂进行了表征。在pH= 5、PMS浓度为1.8 mM、Fe@MWCNT浓度为130 mg/L的条件下，UVA-LED/Fe@ MWCNT/PMS工艺对水溶液中AZB的去除率约为95%。硫酸根自由基对AZB降解的贡献高于羟基自由基和单线态氧。AZB的降解符合准一级动力学模型，速率常数为0.095min（-1）。重金属离子和腐殖酸对氧化过程具有超抑制作用。在AZB的降解过程中，羧酸的监测结果表明，AZB的芳环被打开的硫酸根和羟基自由基的攻击。催化剂重复使用的六个循环证明UVA-LED/Fe@MWCNT/PMS工艺的性能没有显著变化。在其他食用染料和真实的废水上也成功地研究了UVA-LED/Fe@MWCNT/ PMS工艺的实施。UVA-LED/Fe@MWCNT/ PMS工艺是一种高效、稳定的降解水中有机污染物的方法。
Food dyes are a large group of dyes which have been widely used in the food industry. The presence of them in aquatic media results in water pollution. In this work, a heterogeneous photo-assisted peroxymonosulfate (PMS) activation process was used to degrade Azorubine (AZB). Fe2O3 loaded on multi-wall carbon nanotube (Fe@MWCNT) was synthesized and applied to activate PMS under UVA-LED irradiation. Fe@MWCNT catalyst was characterized by XRD, FTIR, EDX-map, BET, FESEM, and TEM analyses. UVA-LED/Fe@MWCNT/PMS process removed around 95% of AZB from aqueous solution under pH= 5, PMS= 1.8 mM, and 130 mg/L Fe@MWCNT. Sulfate radicals showed a higher contribution for AZB degradation compared to hydroxyl radicals and singlet oxygen. Pseudo-first-order model was fitted on AZB degradation with a rate constant of 0.095 min(-1). Bicarbonate ions and humic acid had an ultra-inhibitory effect on the oxidative process. Carboxylic acids were monitored during AZB degradation, with the results indicating that aromatic rings of AZB were opened by the attack of sulfate and hydroxyl radicals. Six cycles of the catalyst reuse demonstrated no significant change in the performance of the UVA-LED/Fe@MWCNT/PMS process. The implementation of the UVA-LED/Fe@MWCNT/ PMS process was also successfully studied on other food dyes and real wastewater. UVA-LED/Fe@MWCNT/ PMS process was an efficient approach for the degradation of organic contaminants in water with high stability.