Enhanced photocatalytic activities of Bi2WO6/BiOCl composite synthesized by one-step hydrothermal method with the assistance of HCl

Facile Preparation of BiOCl/ZnO Heterostructure with Oxygen‐Rich Vacancies and Its Enhanced Photocatalytic Performance

“…It can be clearly seen from the HRTEM that the lattice spacing of 0.271 and 0.274 nm corresponds to the (001) and (110) facets of BiOCl. Figure c shows the corresponding SEAD image of BOZ‐3, the diffraction ring indicating that BOZ‐3 is polycrystalline . The element mapping images demonstrated that Bi, Zn, Cl and O are uniformly distributed on the surface of BOZ‐3 (Figure d), further evidenced BiOCl/ZnO was successfully prepared.…”

“…Clearly observed that the amorphous ZnO nanoparticles gradually appeared with the concentration of ZnCl 2 increasing. In particular, the abundant amorphous ZnO nanoparticles are well dispersed on the surface of BOZ‐3 (Figure d), which may increase the surface area of BOZ‐3 and in favour of contaminant adsorption and transfer . Additionally, the thinner and smaller nanosheets may shorten the transfer distance of photo‐induced carries to the photocatalyst surface, and effectively reduce the recombination rates of photocatalytic electron‐hole pairs …”

Synthesis and Enhanced Photocatalytic Activity of Rare Earth Ion (Ce3+, Nd3+, Pr3+ or Sm3+) Doped Bi2WO6 Microspheres for Rhodamine B Degradation

“…The value of n decides the type of electronic transition in a semiconductor ( n =1 for direct transition and n =4 for an indirect transition). For Bi 2 WO 6 , it is confirmed the value of n is 4 . Figure b shows the plots of hν versus ( αhν ) 0.5 .…”

“…The band edge positions of the pure Bi 2 WO 6 can be calculated by the empirical equations E VB = X – E e + 0.5 E g and E CB = E VB – E g , where E VB is the valence band (VB) edge potential, E CB is the conduction band (CB) edge potential, X is the electronegativity of the semiconductor, E e is the energy of free electrons on the hydrogen scale (about 4.5 eV), E g is the band gap energy of the semiconductor (2.48 eV). The X value is the geometric mean of the electronegativity of the constituent atoms, which is 6.38 eV for Bi 2 WO 6 . Based on above equations, the energy of VB is estimated to be 3.12 eV and that of CB is 0.64 eV.…”

Investigation of photodegradation of rhodamine B over a BiOX (X = Cl, Br and I) photocatalyst under white LED irradiation

“…The crystal lattice of bismuth oxyhalide consists of [Bi 2 O 2 ] 2+ layers sandwiched between two sheets of halide ions, inducing a static internal electric field perpendicular to the [Bi 2 O 2 ] 2+ and halide ion layers [11,12]. The induced electric field can separate the photogenerated electron-hole pairs along the side of [001], which can lead to the enhancement in the photocatalytic activity for the degradation of dye molecules under UV and visible light irradiation [13][14][15][16][17].…”