含铁的柱撑膨润土光催化降解甲基橙  

Photocatalytic Degradation of Methyl Orange by Fe-containing Pillared Bentonites

作　　者：温丽华[1] 李益民 刘颖[1] 李海洋 

机构地区：[1]中国科学院安徽光学精密机械研究所环境光谱学实验室

出　　处：《化学学报》2005年第1期55-59,F007,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No. 20073042);浙江省自然科学基金(No. 202018)资助项目.

摘　　要：将两种含铁柱撑膨润土(Fe-Al-Bent 和 Fe-Bent)用作复相光催化剂, 表征结果证实它们具有很高的比表面积, 铁以高催化活性的 α-Fe2O3 存在于复相催化剂中. 以甲基橙为目标降解物, 考察了不同类型的催化剂、催化剂用量以及H2O2 浓度对其降解的影响, 并与相应的均相 Fenton 反应进行了比较. 结果表明: 两种复相光催化剂的催化脱色性能和CODCr 去除率都很高, 明显优于相应的均相 Fenton 反应, 且复合铁铝柱撑膨润土(Fe-Al-Bent)比单一的铁柱撑膨润土(Fe-Bent)催化性能更好, 此外它们还具有分离简单、重复使用性好等特点.Two kinds of Fe-containing pillared bentonites were used as heterogeneous photocatalysts. Structural characteristics were examined by using XRD, BET and TEM. Results indicate that both catalysts have large surface areas and iron element is in the form of alpha-Fe-2-O-3 of high catalytic activity. The photocatalytic activities of the photocatalysts were determined by the photo-assisted degradation of an organic azo dye methyl orange, and the influence of different types of catalysts, their amounts and the H2O2 concentration were also investigated. Experimental results show that two kinds of heterogeneous photocatalysts both have high catalytic activities of decoloration and CODCx removal. Degradation ratios of two photocatalysts have predominance compared with those of homogeneous Fenton reactions, respectively. The photocatalytic activity of Fe-Al-Bent is superior to that of Fe-Bent because of its larger surface area and higher acidity. In addition, our experiments also illustrate that Fe-Al-Bent can be easily recovered, regenerated and reused.

关 键 词：柱撑 色性 甲基橙 光催化剂 催化性能 光催化降解 催化活性 催化剂用量 Α-FE2O3 膨润土 

分 类 号：X70[环境科学与工程—环境工程]