水杨酸分子印迹掺氮TiO2粉末的制备及在可见光下的选择性光催化研究
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贵州师范大学研究生创新基金(201412);国家自然科学基金(21506041);贵阳市科技局筑科合同(20141021)


Preparation of salicylic acid molecularly imprinted and N-doped TiO2 powders and their selective photocatalytic activity under visible light
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    摘要:

    【目的】改善TiO2在可见光下对污染物的选择性降解能力。【方法】采用改进的分子印迹溶胶-凝胶技术,以尿素、水杨酸分别为氮源和模板分子,制备水杨酸分子印迹掺氮TiO2粉末。通过X射线衍射(XRD)、透射电镜(TEM)、紫外-可见光漫反射吸收光谱(UV-Vis DRS)和低温N2物理吸附-脱附(BET)等技术对制备样品进行表征。【结果】样品均为锐钛矿相,氮掺杂致使TiO2光吸收带边红移,分子印迹使TiO2具有了更为发达的孔结构和孔型,掺杂和分子印迹均有效地增大了比表面积。可见光下,与催化降解苯甲酸及甲基橙相比,分子印迹掺氮TiO2对水杨酸的选择性降解率较高,达96.0%。【结论】水杨酸分子印迹和氮掺杂有效地改善了TiO2的选择性和可见光活性。

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    【Objective】To improve selective degradation ability of catalyst (TiO2)under visible light. 【Method】Salicylic acid molecularly imprinted and N-doped TiO2powders were synthesized by an improved molecularly imprinted sol-gel technique using urea as a nitrogen (N) source and salicylic acid as a template molecule. The samples were characterized by XRD, TEM, UV-Vis diffuse reflectance spectrophotometer and N2 adsorption-desorption.【Result】All samples were anatase.The red-shift of absorption band was caused by doping nitrogen to TiO2 The better-developed pore structure and pass were due to molecular imprinting technique, and the enlarged specific surface area was generated by N-doping and molecularly imprinting. Compared to benzoic acid and methyl orange, TiO2 selective photodegradation rate of salicylic acid (96.0%) was higher under visible light using molecularly imprinting and N-doping.【Conclusion】The selectivity and visible-light photoactivity of TiO2 can be effectively improved using salicylic acid molecularly imprinting and N-doping.

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魏声培,安娅,秦好丽.水杨酸分子印迹掺氮TiO2粉末的制备及在可见光下的选择性光催化研究[J].华南农业大学学报,2016,37(4):134-140

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  • 收稿日期:2015-10-29
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  • 在线发布日期: 2016-06-30