Facile synthesis of high-thermostably ordered mesoporous TiO₂/SiO₂ nanocomposites: An effective bifunctional candidate for removing arsenic contaminations

详细信息    查看全文

• 作者：Yubao Wang^a ; Zipeng Xing^b ; ^{xzplab@163.com" class="auth_mail" title="E-mail the corresponding author} ; Zhenzi Li^c ; ^{zhenzhenlee2014@163.com" class="auth_mail" title="E-mail the corresponding author} ; Xiaoyan Wu^c ; Guofeng Wang^b ; Wei Zhou^b ; ^{zwchem@hotmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Mesoporous material ; TiO2/SiO2 nanocomposite ; Bifunction ; Photocatalysis ; Adsorption
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：485
• 期：Complete
• 页码：32-38
• 全文大小：1344 K

文摘

High-thermostably ordered mesoporous TiO₂/SiO₂ nanocomposites are successfully prepared through evaporation-induced self-assembly method combined with ethylenediamine bounding strategy and subsequent high-temperature calcinations (700 °C). The prepared samples are characterized in detail by thermogravimetric-differential scanning calorimetry, X-ray diffraction, Raman, transmission electron microscopy and N₂ adsorption. The results indicate that the samples are ordered mesostructure and the presence of SiO₂ inhibits the anatase-to-rutile phase transformation at high temperature. Significantly, the experimental results show that the high-thermostably ordered mesoporous TiO₂/SiO₂ nanocomposites play bifunctional roles on effectively adsorbing As (III) and completely oxidizing higher toxic As (III) to lower toxic As (V) under various pH values by one time. Moreover, after recycling for ten times the composites still keep wonderful photocatalytic and adsorption performance. The subtly nanostructured bifunctional composites will have broad application prospects in contaminated water treatment.