Heterogeneous UV-Fenton photodegradation of azocarmine B over [FeEDTA]− intercalated ZnAl-LDH at circumneutral pH
Heterogeneous UV-Fenton photodegradation of azocarmine B over [FeEDTA]− intercalated ZnAl-LDH at circumneutral pH
复制标题
DOI：
10.1039/c6ra14671f
复制
发表时间：
2016-08
期刊：
影响因子：
3.9
通讯作者：
Xiaoxia Tang;Yun Liu;Si-Yu Li
中科院分区：
文献类型：
--
作者：
Xiaoxia Tang;Yun Liu;Si-Yu Li
本研究旨在通过在UV-Fenton工艺中使用Fe(III) -乙二胺四乙酸络合物（[FeEDTA]−）插层双氢氧化物（LDHs）的非均相催化剂，在环中性pH下保持Fe（III）的可溶性形式，并将其从处理过的废水中分离出来，以降解偶氮胺B （ACB）。所有样品都通过各种技术进行了充分表征，结果表明[FeEDTA]−在层状双氢氧体的层间层内成功插入。在ACB的脱色和矿化过程中，得到的催化剂表现出较高的光催化活性和优异的环中性ph稳定性。此外，采用响应面法（RSM）对操作变量进行了优化，这些数学模型得到了满意的拟合。ACB降解的最佳条件为初始pH为6.54，ACB浓度为100 mg L−1，H2O2浓度为11.5 mM。在最优条件下，ACB的最大脱色效率可达97.27%，TOC去除率可达90.36%，与预测值基本吻合。最后，提出了非均相UV-Fenton体系可能参与的反应机理。
This work aimed at maintaining Fe(III) in soluble form at circumneutral pH and separating it from the treated effluent by using the heterogeneous catalyst of Fe(III)–ethylenediaminetetraacetate complex ([FeEDTA]−) intercalated layered double hedroxides (LDHs) in the UV-Fenton process for the degradation of azocarmine B (ACB). All samples were fully characterized by various techniques and the results indicated the successful intercalation of [FeEDTA]− within the interlayer of layered double hedroxides. In the decolorization and mineralization of the ACB process, the obtained catalyst showed a high photo-catalytic activity and an excellent stability at circumneutral pH. In addition, response surface methodology (RSM) was employed to optimize operating variables, and these mathematical models produced a satisfactory fit. The optimum conditions for ACB degradation were confirmed to be 6.54 initial pH, 100 mg L−1 ACB concentration and 11.5 mM H2O2 concentration. Under the optimum conditions, the maximum ACB decolorization efficiency and TOC removal could reach up to 97.27% and 90.36%, respectively, which closely agreed with the predicted values. Finally, the possible reaction mechanisms involved in the heterogeneous UV-Fenton system were proposed.