Solar photocatalytic degradation of 2-sec-butyl-4,6-dinitrophenol (DNBP) using TiO2/SiO2 aerogel composite photocatalysts
Solar photocatalytic degradation of 2-sec-butyl-4,6-dinitrophenol (DNBP) using TiO2/SiO2 aerogel composite photocatalysts
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使用 TiO2/SiO2 气凝胶复合光催化剂太阳能光催化降解 2-仲丁基-4,6-二硝基苯酚 (DNBP)
DOI：
10.1016/j.matchemphys.2011.09.033
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发表时间：
2011-11
影响因子：
4.6
通讯作者：
Jiang Wen-Feng
中科院分区：
文献类型：
--
作者：
Wang Hui-Long;Liang Wen-Zhen;Jiang Wen-Feng
分别以钛酸四丁酯和正硅酸酯为前驱体，采用溶胶-凝胶法在常压下制备了SiO2气凝胶和TiO 2/SiO2气凝胶复合光催化剂。采用XRD、TEM、BET比表面积、FT-IR和UV-vis吸收光谱等手段对复合光催化剂进行了表征。结果表明，TiO 2/SiO2气凝胶复合光催化剂具有较高的比表面积。二氧化硅气凝胶的加入抑制了煅烧过程中金红石向金红石的相变和晶粒长大。TiO 2/SiO2气凝胶复合材料样品在500°C下煅烧，SiO2气凝胶的最佳含量为7 wt.%提供了最高的光催化活性。以2-仲丁基-4，6-二硝基苯酚（DNBP）为目标物，研究了该复合光催化剂在太阳光照射下的光催化降解性能。考察了光照时间、pH值、催化剂浓度、温度和DNBP初始浓度对反应的影响。最佳操作参数为：溶液pH 4.82，催化剂浓度8 gL-1，温度20°C，光照时间240 min。TiO 2/SiO2气凝胶复合材料降解DNBP的动力学符合准一级动力学模型。并对光催化活性的重复性进行了测试。该研究表明，TiO 2/SiO2气凝胶复合光催化剂在降解有毒有机污染物方面具有可行性和潜在的应用前景。
Silica aerogels and TiO2/silica aerogel composite photocatalysts were synthesized by sol–gel technique at ambient pressure using orthosilioate and tetra-n-butyl titanate as precursors, respectively. The prepared composite photocatalysts were characterized by XRD, TEM, BET surface area, FT-IR and UV–vis absorption spectra. The results showed that the TiO2/silica aerogel composite photocatalysts possess high surface area. The addition of silica aerogels inhibited the grain growth and phase transformation of anatase to rutile during calcination. The TiO2/silica aerogel composite sample calcined at 500°C with an optimal silica aerogel content of 7wt.% afforded the highest photocatalytic activity. The photocatalytic degradation of 2-sec-butyl-4,6-dinitrophenol (DNBP) was investigated by using this novel TiO2/silica aerogel composite photocatalyst under solar light irradiation. The effects of irradiation time, pH, catalyst concentration, temperature and initial DNBP concentration were examined as operational parameters. The optimal operational parameters were found as follows: pH as solution pH 4.82, 8gL−1catalyst concentration, 20°C, and 240min irradiation time. The kinetics of DNBP degradation by TiO2/silica aerogel composite fit well a pseudo-first-order kinetic model. The repeatability of photocatalytic activity was also tested. This study showed the feasible and potential use of TiO2/silica aerogel composite photocatalysts in degradation of toxic organic contaminants.
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影响因子：
4.2
作者：
Huilong Wang;Wen-Feng Jiang
通讯作者：
Huilong Wang;Wen-Feng Jiang
影响因子：
3.3
作者：
M. Matsumoto;Carlo Poncipe;M. Ema
通讯作者：
M. Matsumoto;Carlo Poncipe;M. Ema
影响因子：
13.6
作者：
Guo, Zhaobing;Feng, Ruo;Zheng, Youfei
通讯作者：
Zheng, Youfei
影响因子：
12.8
作者：
Kim, MS;Hong, KM;Chung, JG
通讯作者：
Chung, JG
DOI：
10.1001/jama.1933.02740280013006
发表时间：
1933-07-01
影响因子：
--
作者：
Cutting, WC;Mehrtens, HG;Tainter, ML
通讯作者：
Tainter, ML