Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)

Abstract

In this work, we report on the synthesis of nitrogen doped SrTiO3 nanoparticles with efficient visible light driven photocatalytic activity toward Cr(VI) by the solvothermal method. The samples are carefully characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV–Vis diffuse reflectance spectroscopy and photocatalytic test. It is found that nitrogen doping in SrTiO3 lattice led to an apparent lattice expansion, particle size reduction as well as subsequent increase of Brunner–Emmet–Teller surface area. The visible light absorption edge and intensity can be modulated by nitrogen doping content, which absorption edge extends to about 600 nm. Moreover, nitrogen doping can not only modulate the visible light absorption feature, but also have consequence on the enhancement of charge separation efficiency, which can promote the photocatalytic activity. With well controlled particle size, Brunner–Emmet–Teller surface area, and electronic structure via nitrogen doping, the photocatalytic performance toward Cr(VI) reduction of nitrogen doped SrTiO3 was optimized at initial hexamethylenetetramine content of 2.Electronic supplementary materialThe online version of this article (doi:10.1186/s40064-016-2804-2) contains supplementary material, which is available to authorized users.

Polyethylene Glycol as Shape and Size Controller for the Hydrothermal Synthesis of SrTiO3 Cubes and Polyhedra

“…Moreover, we can observe a tail in the absorption edge, extending down to 600 nm. A similar behavior has already been observed in SrTiO3 materials doped with nitrogen or containing oxygen vacancies [34]. However, in our case, this electronic absorption could likely be associated to the presence of traces of a lithiated phase [35] which has also been detected by XRD (see Section 2.1).…”

Effect of SrTiO3 Nanoparticles in Conductive Polymer on the Thermoelectric Performance for Efficient Thermoelectrics

“…The high-resolution Sr 3d spectrum (Figure 1c) showed peaks at~132 and~134 eV that correspond to the Sr 3d 5/2 and 3d 3/2 binding energies, respectively, of pristine SrTiO 3 , suggesting its existence in the Sr 2+ state. Ti existed as Ti 4+ , as revealed by the two separate peaks at~463 and~458 eV, corresponding to Ti 2p 1/2 and Ti 2p 3/2 , respectively (Figure 1d) [37].…”

Effect of Bismuth Dopant on the Photocatalytic Properties of SrTiO3 Under Solar Irradiation

“…The STO-0.5-STO-5 samples doped with Bi depict an enhanced absorption (with respect to STO-0) that extends up to 750 nm. Furthermore, the STO:Bi samples shows an absorption bands at 260 nm which is attributed to Bi 3+ ions ( 1 S 0 -1 P 1 transition [20]) and two bands at 520 and 652 nm that are ascribed to Bi related defects (oxygen vacancies) induced by charge imbalance [46,47]. STO-1 presents the most intense absorption in the visible region.…”