A ternary Er3+-BiVO4/TiO2 complex heterostructure with excellent photocatalytic performance

Abstract

Ternary erbium doped BiVO 4 /TiO 2 complexes are synthesized by means of a simple impregnation method with good photoactivities under sun-like excitation for the degradation of phenol. From the structural and morphological characterization it has been stated that the presence of Er 3+ induces a slight stabilization of the tetragonal phase probably due to its incorporation in the BiVO 4 lattice. Therefore a ternary heterostructured material has been obtained. The best photocatalytic performance was attained for the samples with 1 wt% of Er 3+ -doped BiVO 4 content with respect to TiO 2 . The occurrence of a complex structural mixture with the adequate band position leads to effective charge pair separation which induces higher photocatalytic activities.

Facile synthesis of nanostructured monoclinic bismuth vanadate by a co-precipitation method: Structural, optical and photocatalytic properties

“…4 shows the Raman spectra of The broadening shoulder observed at lower wavelength around 355 cm À 1 indicates the symmetric deformation modes of the VO 4 3 À tetrahedron and another predominant peak observed at higher wavelength around 820 cm À 1 attributed to the stretching modes of V-O bonds [41]. The later one indicates the BiVO 4 unit cell structure distortion induced by variation of Bi 3 þ ions which may affect any one of the factors such as doping, crystallite facet, morphology variation and defect creations [51][52][53][54][55]. It clearly shows that the characteristic peak at 820 cm À 1 shifted towards lower wavelength region by increasing the calcination temperature.…”

Synthesis of a monoclinic BiVO4 nanorod array as the photocatalyst for efficient photoelectrochemical water oxidation

“…Instead, the 1D nanostructure using BiVO 4 as the photocatalyst for the PEC water splitting was commonly designed by applying the heterojunction structure composed of 1D TiO 2 or WO 3 nanostructure arrays as the core material coupled with BiVO 4 as the light absorber. 8,28,29 In this study, a pure 1D BiVO 4 nanorod array was successfully made on the uorine-doped tin oxide (FTO) glass via a simple solution method. The reaction time and temperature were tuned to observe the morphology variation of the BiVO 4 nanostructures and the corresponding photoelectrochemical performances for water oxidation.…”

Thermo‐Photocatalysis: Environmental and Energy Applications

“…The rate con- ChemSusChem 2019ChemSusChem , 12,2098ChemSusChem -2116 www.chemsuschem.org 2019 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim stants were 0.0377 and 0.0204 min À1 under UV andV is illumination condition, respectively.T he CeO 2 sample showed1 .5and 2.7-fold increases in activity under UV and Vis light when temperature increases from 8 8Ct o6 5 8C, respectively.I nt his case, similart op reviously analyzed work [47] enhanced thermophotocatalytic activity was attributed to efficient charge photo-handling in regions of high defect density at high temperature.I nd etail, electrons can be captured by surface oxygen to form superoxide and holes by H 2 O( or OH À )t op roduce hydroxyl radicals, which are responsible form ethyl orange degradation. AE r 3 + -BiVO 4 /TiO 2 complex heterostructure, [48] and Er 3 + -, Yb 3 + -, or Er 3 + /Yb 3 + -doped TiO 2 [49] have been tested by using phenol as modelm olecule. AE r 3 + -BiVO 4 /TiO 2 complex heterostructure, [48] and Er 3 + -, Yb 3 + -, or Er 3 + /Yb 3 + -doped TiO 2 [49] have been tested by using phenol as modelm olecule.…”

“…[25] Finally,s omes tudies in which Er and/orY rc omponents induce thermo-photocatalytic processes under Vis and IR excitation can be mentioned. AE r 3 + -BiVO 4 /TiO 2 complex heterostructure, [48] and Er 3 + -, Yb 3 + -, or Er 3 + /Yb 3 + -doped TiO 2 [49] have been tested by using phenol as modelm olecule. The results obtained suggest that the concurrence of TiO 2 and Er 3 + -BiVO 4 composite heterostructurew ould drivei mproved performance through an optimized charge separation process.F or the codoped samples, after 3h of irradiation, 89 %p henol degradation was obtained.…”