Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 312, Issue -, Pages 45-54Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.03.032
Keywords
SrTiO3; Templating; Porous microspheres; Photocatalysis; Cr(VI)
Categories
Funding
- National Science Fund for Distinguished Young Scholars [21125627]
- National Natural Science Funds of China [21406163]
- Tianjin Research Program of Application Foundation and Advanced Technology [15JCQNIC10000]
- Program of Introducing Talents of Discipline to Universities [B06006]
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Solving the increasing contamination from toxic heavy metal ions in wastewater is an imperative issue in photocatalysis research area. In this study, three-dimensional (3D) porous SrTiO3 microspheres have been fabricated by a sol-gel-templating method using the agarose gel bead containing SrCO3 granules as the template. The resultant SrTiO3 microspheres, several tens of micrometers in diameter, exhibit a bimodal pore structure, in which the macropore about 70-150 nm in size stems from SrCO3 granules and the mesopore about 3 nm is formed via removing the agarose fiber embedded in the composite microspheres. The porous framework of SrTiO3 microspheres is assembled by regular single-crystalline SrTiO3 nanocubes with an edge length of 100 +/- 10 nm. The highly interconnected porous network renders numerous pathways for the rapid mass transport, strong adsorption of reactants and multi-reflection of incident light. Moreover, the as-prepared SrTiO3 microspheres exhibit excellent photocatalytic performance for the Cr(VI) reduction under simulated sunlight, which can reduce nearly 100% Cr(VI) at pH 2 within 2 h and retain a relatively high reduction ability after six recycles. (C) 2016 Elsevier B.V. All rights reserved.
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