Fe-Al柱撑膨润土的制备及其非均相Fenton降解橙黄Ⅱ(英文)  

Synthesis of Fe-Al Pillared Bentonite and Heterogeneous Fenton Degradation of Orange Ⅱ

作　　者：万栋[1] 王光华[1] 李文兵[1] 陈坤[1] 舒广[1] 

机构地区：[1]武汉科技大学化学工程与技术学院,武汉430081

出　　处：《物理化学学报》2013年第11期2429-2436,共8页Acta Physico-Chimica Sinica

基　　金：supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China(20114219110002);Hubei Key Laboratory of Coal Conversion and New Carbon Materials(Wuhan University of Science and Technology),China(WKDM201107);Educational Commission of Hubei Province,China(D20131107)~~

摘　　要：通过离子交换方法制备不同Fe含量的Fe-Al柱撑膨润土,并且研究了其作为非均相Fenton催化剂降解橙黄II的性能.通过X射线粉末衍射(XRD),比表面积(SBET),傅里叶变换红外(FTIR)光谱,拉曼(Raman)光谱和扫描电子显微镜(SEM)研究其结构特征.结果显示,钠化膨润土的层间距为1.24 nm,经过柱撑之后,Al柱撑膨润土的层间距增大到1.77 nm,Fe-Al柱撑膨润土为1.72 nm左右,并且比表面积也有明显增大.XRD和Raman结果表明Fe/(Fe+Al)摩尔比达到20%时,样品中出现α-Fe2O3,膨润土未能形成柱撑.在橙黄II初始浓度为100 mg L-1,催化剂用量为1.0 g L-1,温度为40°C,pH为3.0,H2O2初始浓度为10 mmol L-1的条件下,考察了柱撑膨润土的Fenton催化活性.结果表明,Fe-Al柱撑膨润土的催化性能随着Fe含量的增多先增大后略有降低,当Fe/(Fe+Al)摩尔比为10%时达到最大,橙黄II溶液在4 h内色度去除率和化学需氧量(CODCr)去除率分别达到100%和87.73%,并且降解反应为非均相Fenton反应.研究了Fe-Al柱撑膨润土的重复使用性.催化剂循环使用4次,仍然具有良好的活性.A series of Fe-AI pillared bentonites with different Fe contents were synthesized through a simple ion exchange method. The samples were used as catalysts for the heterogeneous Fenton degradation of Orange II. The microstructure of the catalysts was characterized by X-ray diffraction （XRD）, specific surface area measurements （SBET）, Fourier transform infrared （FTIR） spectroscopy, Raman spectroscopy, and scanning electron microscopy （SEM）. The obtained results showed that the pillaring process increased the basal spacing （d^o01~） from 1.24 nm for the Na-bentonite （Bent） to 1.77 nm for the AI- Bent and -1.72 nm for the Fe-AI pillared bentonites, The S^ET values of the samples were increased after pillaring, It was obvious from the XRD and Raman results that intercalation was not achieved and that hematite was formed in the 20Fe-AI-Bent sample. The influence of Fe content on the degradation of Orange II was investigated, The catalytic activity of pillared bentonites increased with Fe content and hardly increased when the molar ratio of Fe/（Al ＋ Fe） in the pillaring solution exceeded 10%. The decolorization efficiency and chemical oxygen demand （CODcr） removal of Orange II reached 100% and 87.73%, respectively, after 4 h oxidation reaction using the 10Fe-AI-Bent sample. It is also proved that the whole decomposition of Orange II by 10Fe-AI-Bent was dominated by heterogeneous Fenton reaction. The catalysts were chemically stable and reusable, with low release of iron.

关 键 词：Fe-Al柱撑膨润土 非均相催化剂 橙黄II FENTON反应 降解 

分 类 号：X703[环境科学与工程—环境工程]