CdWO4 polymorphs: Selective preparation, electronic structures, and photocatalytic activities

Tungsten-based nanomaterials (WO 3 & Bi 2 WO 6 ): Modifications related to charge carrier transfer mechanisms and photocatalytic applications

“…This is a major problem for developing visible light active photocatalysts. Recently, metal tungstates like CdWO 4 , PbWO 4 , ZnWO 4 and Ag 2 WO 4 are exploited for photocatalysis as their electronic band structures and chemical reactivity are suitable for the generation of free radicals in the aqueous suspension [193][194][195] the bacteria inactivation [203][204][205]. Bi 2 WO 6 can be prepared by several conventional methods including sol-gel [206], hydrothermal/solvothermal [207][208][209], combined sol-gel-hydrothermal [210], sonochemical [211], with various hierarchical morphologies like nanoplates, red-blood cells, bowl-like, peony flowers, microspheres, nanolaminar, hollow structure, microdisc, multilayered disks etc.…”

Effects of the crystalline structure of Ga2O3 on the photocatalytic activity for CO production from CO2

“…[5][6][7][8] The photocatalytic performance of the metal oxides depends on their crystalline structure, because the different crystal structure provides different structural stability, band gap energy, and surface chemical property. 4,[9][10][11] Recently, searches of oxides as a good photocatalyst have been extended to use combinations of polymorphs of a metal oxide, such as TiO 2 and Ga 2 O 3 , mixed oxides, or substitutional cation doping. [12][13][14][15] As for the polymorphs, phase junction or phase boundaries of the polymorphs have attracted particular interests for possibility to charge separation critically important for photocatalytic water splitting and CO 2 reduction with water.…”

A survey of photocatalytic materials for environmental remediation

“…CdWO 4 is another tungstate that has been investigated for the photodegradation of organic compounds under UV light irradiation [329,330]. Monoclinic CdWO 4 short rods synthesized via a hydrothermal process exhibited a high photocatalytic activity for the degradation of MO and RhB [329].…”

“…The photactivities of CdWO 4 and ZnWO 4 were practically the same but TiO 2 revealed a higher velocity to degrade MO. Yan et al [330] selectively prepared monoclinic and tetragonal CdWO 4 by an aqueous solvothermal process and found that the monoclinic polymorph was much more active than the tetragonal CdWO 4 .…”