Mesoporous structure TiO 2 /SiO 2 composite for methylene blue adsorption and photodegradation
Mesoporous structure TiO 2 /SiO 2 composite for methylene blue adsorption and photodegradation
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DOI：
10.1049/mnl.2018.5300
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发表时间：
2019-03
影响因子：
1.3
通讯作者：
Jidong Wang;Zhijie Gu;Jialin Zhang;Xin Chen;Mengjuan Li;Yuan-hua Yu;M. Ge;Xiaoqiang Li
中科院分区：
文献类型：
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作者：
Jidong Wang;Zhijie Gu;Jialin Zhang;Xin Chen;Mengjuan Li;Yuan-hua Yu;M. Ge;Xiaoqiang Li
本文采用溶胶-凝胶法结合煅烧制备了具有良好吸附和光催化性能的介孔结构TiO 2 /SiO 2（M-TS）复合材料。通过扫描电子显微镜和Brunauer-Emmett-Teller分析表征样品的结构。研究了M-TS对亚甲基蓝（MB）的吸附性能，考察了M-TS的组成、用量、初始浓度和温度等因素对吸附性能的影响。通过从前驱体凝胶中去除聚乙烯吡咯烷酮来制备M-TS，这对优异的吸附能力至关重要。采用Langmuir和Freundlich等温模型、准一级和准二级动力学方程以及颗粒内扩散模型对吸附等温线和动力学数据进行拟合。吸附等温线符合Langmuir吸附等温式，吸附动力学符合准二级动力学。同时发现，M-TS对阳离子染料的吸附能力优于阴离子染料。吸附和光降解实验结果表明，吸附容量的提高提高了脱色效率。结果表明，M-TS可作为一种有效的吸附剂和光催化剂，用于去除废水中的阳离子染料。
In this work, a mesoporous structure TiO 2 /SiO 2 (M-TS) composite with excellent adsorption and photocatalytic properties was fabricated by a sol-gel process combined with calcination. The structure of the samples was characterised by scanning electron microscopy and Brunauer-Emmett-Teller analysis. The factors influencing the adsorption behaviours of methylene blue (MB) onto M-TS, including ingredient, dosage, initial concentration and temperature were investigated. The M-TS was produced by removing poly(vinylpyrrolidone) from the precursor gel was vital to the excellent adsorption capacity. Furthermore, the isotherm and kinetic data were fitted by using Langmuir and Freundlich isotherm models, pseudo-first-order and pseudo-second-order equations, and the intra-particle diffusion model. The Langmuir isotherm model and the pseudo-second-order kinetics were the most suitable models for describing the adsorption of MB onto M-TS. It was also found that the adsorption capacity of cationic dyes on M-TS is better than that of anionic dyes. The experimental results of adsorption and photodegradation proved that improvement of adsorption capacity enhances the decolourisation efficiency. This work shows that the M-TS could be used as an effective adsorbent and photocatalyst to remove cationic dyes from wastewater.