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Synthesis of a bicontinuous structured SrTiO 3 porous film with significant photocatalytic activity by controlling phase separation process
Journal of Sol-Gel Science and Technology ( IF 2.5 ) Pub Date : 2020-03-13 , DOI: 10.1007/s10971-020-05271-6
Shengfei Li , Mingchun Li , Aili Tao , Minggao Song , Baoting Wang , Jiaming Niu , Fuyuan Yu , Yusheng Wu

Abstract

A series of hierarchically porous SrTiO3 films with different pore structure characteristics from bicontinuous macroporous–mesoporous structure to ordered and fragmented structures have been synthesized using sol–gel method, by controlling the competition between polyethylene glycol (PEG)-induced phase separation and sol–gel transition. Field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) analysis, X-ray diffractometry (XRD) and photoluminescence (PL) spectroscopy were used to characterize the as-prepared samples. The bicontinuous structured SrTiO3 porous film constructed by irregular grains possessed three-dimensional (3D) interconnected network with both macropores (80–400 nm) and mesopores (1–10 nm), which provides abundant active sites (the specific surface area up to 121.9 m2/g) and ensures fast mass transfer simultaneously. In addition, PL spectra illustrated that the film consisting of 3D bicontinuous macroporous– and mesopores has a relatively low photocarrier recombination rate. As a result, the SrTiO3 film with 3D bicontinuous porous structure exhibits more outstanding photocatalytic behavior with high degradation capability for Rhodamine B (RhB) (99.8% after 90 min irradiation by 500 W mercury lamp) than the others. Moreover, nearly 80% of the degradation efficiency can be achieved after five cycles.

3D bicontinuous macroporous–mesoporous structured SrTiO3 film shows significant photocatalytic degradation of RhB.



中文翻译:

通过控制相分离过程合成具有显着光催化活性的双连续结构SrTiO 3多孔膜

摘要

通过控制聚乙二醇(PEG)诱导的相分离与溶胶-凝胶之间的竞争,使用溶胶-凝胶法合成了一系列具有不同孔结构特征的分级多孔SrTiO 3膜,从双连续大孔-中孔结构到有序和碎片结构。凝胶转变。场发射扫描电子显微镜(FESEM),透射电子显微镜(TEM),Brunauer-Emmett-Teller(BET)分析,X射线衍射(XRD)和光致发光(PL)光谱用于表征制备的样品。双连续结构SrTiO 3由不规则晶粒构成的多孔膜具有三维(3D)互连网络,其中大孔(80–400 nm)和中孔(1–10 nm)都提供了丰富的活性部位(比表面积高达121.9 m 2 / g )并确保同时快速传质。此外,PL光谱表明,由3D双连续大孔和中孔组成的薄膜具有较低的光载流子复合率。结果,具有3D双连续多孔结构的SrTiO 3膜对罗丹明B(RhB)表现出更优异的光催化性能(在用500 W汞灯照射90分钟后具有99.8%的降解能力)。而且,在五个循环后可以达到近80%的降解效率。

3D双连续大孔-中孔结构SrTiO 3膜显示RhB的光催化降解。

更新日期:2020-03-13
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