Floating photocatalyst of B-N-TiO2/expanded perlite: a sol-gel synthesis with optimized mesoporous and high photocatalytic activity.
Floating photocatalyst of B-N-TiO2/expanded perlite: a sol-gel synthesis with optimized mesoporous and high photocatalytic activity.
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B-N-TiO2/膨胀珍珠岩的浮动光催化剂：具有优化介孔和高光催化活性的溶胶-凝胶合成
DOI：
10.1038/srep29902
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发表时间：
2016-07-19
影响因子：
4.6
通讯作者：
Wang X
中科院分区：
文献类型：
--
作者：
Xue H;Jiang Y;Yuan K;Yang T;Hou J;Cao C;Feng K;Wang X
采用溶胶-凝胶法合成了具有高比表面积和大孔径的优化介孔光催化剂。这些大孔介孔材料(33.39 nm)有利于较大分子或基团在孔道中的运动，有利于活性中心的有效利用。较高的比表面积(SBET，99.23 m2 g−1)有利于催化氧化。此外，B和N共掺杂的锐钛矿型纳米二氧化钛在Ti-O-B-N和O-Ti-B-N的存在下，有助于优化其孔结构，提高光响应能力，具有较窄的带隙和吸收红移。基于膨胀珍珠岩(EP)得到的具有漂浮特性的材料表现出良好的光催化活性。B-N-TiO2EP(6 mg/g，24 wt%TiO2光催化剂)在可见光区降解5 h，在紫外区光降解1 h，降解率达99.8%。研究结果为制备方法简单、优化的介孔、共掺杂助剂、以及良好的光催化性能、可覆盖性和可重复使用的光催化剂的制备提供了启示。B-N-TiO2/EP在实际环境净化方面具有潜在的应用前景。
Optimized mesoporous photocatalyst endowed with high specific surface area and large pore size was synthesized by sol–gel method. These large pore mesoporous materials (33.39 nm) were conducive to the movement of larger molecules or groups in pore path and for effective use of active sites. The high specific surface area (SBET, 99.23 m2 g−1) was beneficial to catalytic oxidation on the surface. Moreover, B and N co-doped anatase TiO2 in the presence of Ti–O–B–N and O–Ti–B–N contributed to the pore structure optimization and enhanced photoresponse capacity with a narrow band gap and red shift of absorption. The obtained materials with floating characteristics based on expanded perlite (EP) showed favorable features for photocatalytic activity. The best RhB photodegration rate of B–N–TiO2/EP (6 mg/g, 24 wt% TiO2) reached 99.1% after 5 h in the visible region and 99.8% after 1 h in the UV region. The findings can provide insights to obtain floatable photocatalysts with simple preparation method, optimized mesoporous, co-doping agents, as well as good photocatalytic performance, coverable and reusability. B–N–TiO2/EP has potential applications for practical environmental purification.