Simulated solar light photooxidation of azocarmine B over hydroxyl iron–aluminum pillared bentonite using hydrogen peroxide
Simulated solar light photooxidation of azocarmine B over hydroxyl iron–aluminum pillared bentonite using hydrogen peroxide
复制标题
使用过氧化氢在羟基铁铝柱膨润土上进行偶氮胭脂红 B 的模拟太阳光光氧化
DOI：
10.1016/j.clay.2014.02.025
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发表时间：
2014-10
影响因子：
5.6
通讯作者：
刘云
中科院分区：
文献类型：
--
作者：
刘云
采用离子交换法合成了羟基铁铝柱撑膨润土（FeAlPBent）。采用X射线衍射（XRD）、X射线荧光光谱（XRF）、比表面积（BET）、紫外-可见漫反射光谱（UV-vis）等手段对催化剂进行了表征。以偶氮胭脂红B（AC B）为模型污染物，在模拟太阳光照射下，考察了不同反应条件下FeAlPBent的光Fenton催化活性。采用Box-Behnken设计的响应面法考察了工艺参数对偶氮胭脂红B去除效果的影响。结果表明，羟基铝铁离子成功地插层到膨润土层间，FeAlPBent具有较高的光催化活性。ACB去除的最佳工艺条件为：ACB浓度80 mg/L，pH 3，H2 O2浓度20 mM，催化剂投加量0.6 g/L。在此条件下，ACB的最大脱色率和TOC去除率分别为99.3%和73.9%。此外，实验还表明FeAlPBent具有长期稳定性。通过高斯模型计算和GC-MS分析，初步推测了ACB的氧化降解途径。
Hydroxy iron–aluminum pillared bentonite (FeAlPBent) was synthesized with ion exchange method. The catalysts were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), BET, UV–vis diffuse spectra. The photo-Fenton catalytic activity of FeAlPBent was tested under a different reaction condition using azocarmine B (ACB) as model pollutant under simulated solar light irradiation. Response surface methodology based on Box–Behnken design was employed to investigate the effects of process variables on the removal of azocarmine B. The results indicated that hydroxy aluminum iron ions intercalated into the interlayer spaces of bentonite successfully and FeAlPBent had high photocatalytic activity. The optimum conditions for ACB removal were dye concentration of 80 mg/L ACB, pH 3, H2O2concentration of 20 mM and catalyst dosage of 0.6 g/L. Under these conditions, the maximum ACB decolorization efficiency and TOC removal were 99.3% and 73.9%, respectively. In addition, the experiments also illustrated that FeAlPBent had a long-term stability. Furthermore, a tentative pathway for the oxidative degradation of ACB was postulated by Gaussian calculation and GC–MS analysis.
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