Synthesis and characterization of novel SiO2 and TiO2 co-pillared montmorillonite composite for adsorption and photocatalytic degradation of hydrophobic organic pollutants in water
Synthesis and characterization of novel SiO2 and TiO2 co-pillared montmorillonite composite for adsorption and photocatalytic degradation of hydrophobic organic pollutants in water
复制标题
新型SiO2和TiO2共柱蒙脱石复合材料的合成与表征，用于吸附和光催化降解水中疏水性有机污染物
DOI：
10.1016/j.cattod.2010.11.014
复制
发表时间：
2011-04-30
期刊：
影响因子：
5.3
通讯作者：
Zhao, Huijun
中科院分区：
文献类型：
--
作者：
Chen, Jiangyao;Liu, Xiaolu;Zhao, Huijun
采用溶胶-凝胶法将SiO2和TiO 2混合溶胶柱撑到钠基蒙脱石上，制备了一系列具有良好吸附能力和高光催化活性的SiO2和TiO 2共柱撑蒙脱石光催化剂。各种材料表征技术，如粉末X射线衍射（XRD），氮气吸附/脱附等温线和扫描电子显微镜（SEM）被用来检查柱撑蒙脱石。以典型的疏水性有机污染物2，4，6-三氯苯酚为模型污染物，研究了复合柱撑蒙脱石对2，4，6-三氯苯酚的吸附性能和光催化活性.实验结果表明，柱撑蒙脱石中SiO2含量高有利于吸附容量的提高，而共柱撑蒙脱石中TiO 2含量高有利于光催化活性的提高，SiO2/TiO 2摩尔比为1：2时制备的共柱撑蒙脱石光催化活性最高。此外，还检测到2，4-二氯苯酚、2-氯-1，5-联苯酚、1，3，7-三氯二苯并二恶英、2，6-二氯二苯并二恶英、己二烯二酸、丁基醇酸、草酸、间苯三酚和联苯酚等9种中间产物，初步提出了TCP的光催化降解机理。(C)2010年爱思唯尔B。版权所有© 2016
A series of SiO2 and TiO2 co-pillared montmorillonite photocatalysts with excellent adsorption capacity and high photocatalytic activity were synthesized via a sol-gel method by pillaring both SiO2 and TiO2 mixed sol into sodium montmorillonite. Various material characterization techniques such as powder X-ray diffraction (XRD), nitrogen adsorption/desorption isotherms and scanning electron microscopy (SEM) were used to examine the pillared montmorillonites. 2,4,6-trichlorophenol, a typical hydrophobic organic pollutant, was used as a model pollutant to evaluate the adsorption capacity and photocatalytic activity of the prepared co-pillared montmorillonites. The experimental results showed that large SiO2 content in the pillared montmorillonite was in favor of large adsorption capacity, while large TiO2 content in the co-pillared montmorillonite was beneficial for the high photocatalytic activity, and the highest photocatalytic activity was obtained for the prepared co-pillared montmorillonite with a SiO2/TiO2 molar ratio of 1:2. Additionally, nine intermediates including 2,4-dichlorophenol, 2-chloro-1,5-diphenol, 1,3,7-trichlorodibenzo-p-dioxin, 2,6-dichlorodibenzo-p-dioxin, hexadiene diacid, butyl alkyd, oxalic acid, phloroglucinol and diphenol were detected, and a photocatalytic degradation mechanism of TCP was tentatively proposed. (C) 2010 Elsevier B. V. All rights reserved.