Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 275, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2021.119096
Keywords
Mesocrystalline anatase TiO2 submicrospheres; Highly dispersive SrTiO3 nanodots; Hexavalent chromium Cr-VI; Photocatalytic reduction; Type-II heterojunction
Categories
Funding
- National Natural Science Foundation of China [22072052, 21603079, 21503085]
- Fundamental Research Funds for the Central Universities [2662020LXPY004, 2662019PY025]
Ask authors/readers for more resources
Mesoporous anatase TiO2 sphere based materials have been extensively studied for environmental applications due to their advantageous properties. By utilizing mesocrystalline anatase submicrospheres, novel sphere-shaped anatase mesocrystal/SrTiO3 nanodot heterostructures were successfully developed and showed enhanced activity in reducing hexavalent chromium under solar light. This study provides a useful method for designing TiO2 based photocatalysts with complex spherical morphologies for environmental purification.
Mesoporous anatase TiO2 sphere based materials has long been the focus of intensive research dealing with environmental-related issues due to their significant advantages in terms of structural isotropy, high surface area, structural stability, and low cost. However, in most cases, the employed mesoporous anatase spheres were comprised of nanocrystalline subunits with random crystalline orientations, which means that numerous grain boundaries exist in the sphere-shaped particles, suppressing their performance in various applications. Herein, by using mesocrystalline anatase submicrospheres that were synthesized via utilizing SO42- ions to modulate the growth dynamics of anatase crystals in the green mixed solvents of PEG-400 and H2O as both template and reactant, novel sphere-shaped anatase mesocrystal/SrTiO3 nanodot heterostructures were successfully produced. These spherical anatase mesocrystal/SrTiO3 heterostructures exhibited noticeably enhanced activity toward reduction of hexavalent chromium (Cr-VI) under stimulated solar light irradiation, which was largely attributed to their favored adsorption of Cr-VI, bolstered photogenerated charge carrier separation and well-preserved reduction capability due to the construction of a well-defined type-II heterojunction with tight interfacial contacts and strong interactions. This work will be useful for the designed fabrication of micro/nanostructured TiO2 based photocatalysts with complex spherical morphologies for photocatalytic applications in environmental purification.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available