Synthesis, characterization and photocatalytic performance of transition metal tungstates

Characterization and photoactivity of coupled ZnO–ZnWO4 catalysts prepared by a sol–gel method

“…Zhu and coworkers reported that ZnWO 4 exhibited relatively high photocatalytic activity for the degradation of aqueous solutions of rhodamine B [25][26][27][28][29][30][31] and methylene blue [30,37] and also for gaseous formaldehyde [26][27][28]. ZnWO 4 was efficient for the decomposition of salicylic acid [35] and the decoloration of methyl orange [37], malachite green [36,38] and rhodamine 6G [33].…”

“…Zinc tungstate (ZnWO 4 ) is a promising material for applications in heterogeneous photocatalysis due to its interesting physical and chemical properties [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Zhu and coworkers reported that ZnWO 4 exhibited relatively high photocatalytic activity for the degradation of aqueous solutions of rhodamine B [25][26][27][28][29][30][31] and methylene blue [30,37] and also for gaseous formaldehyde [26][27][28].…”

“…Zhu and coworkers reported that ZnWO 4 exhibited relatively high photocatalytic activity for the degradation of aqueous solutions of rhodamine B [25][26][27][28][29][30][31] and methylene blue [30,37] and also for gaseous formaldehyde [26][27][28]. ZnWO 4 was efficient for the decomposition of salicylic acid [35] and the decoloration of methyl orange [37], malachite green [36,38] and rhodamine 6G [33]. Up to now ZnWO 4 photocatalysts have been synthesized by a variety of different processes including co-precipitation [26], hydrothermal methods [28][29][30][31][32][33], microwave assisted techniques [35,39] and mechanochemical synthesis at room temperature [38].…”

Effect of FeWO 4 doping on the photocatalytic activity of ZnO under visible light irradiation

“…Metal tungstate (MWO 4 ; M = Ni, Fe, Ba, Bi) is one of the narrow band gap semiconductor to exploit new photocatalysts with visible light driven photocatalytic ability [16,17]. Among these FeWO 4 has been found to posses interesting physical properties such as ferroelectric piezoelectricity, pyroelectricity, catalytic behaviour and a nonlinear dielectric susceptibility [18]. According to Bera et al [19] a hetrojunction is formed when FeWO 4 is coupled with wide band gap semiconductor (TiO 2 ).…”

Enhanced photocatalytic performance of (ZnO/CeO2)-β-CD system for the effective decolorization of Rhodamine B under UV light irradiation

“…Semiconductor photocatalysis is a promising and alternative to conventional methods and more attractive for the removal from waste water because of its effective, simple instrumental technique, easy controlled operation, non-selective oxidation, low expensive, complete mineralization and degradation of synthetic organic dyes (Zhang et al 2015;Yuan et al 2015). Many semiconductors like ZnO, TiO 2 , CeO 2 , WO 3 , CdS and ZnS are used as photocatalysts for environmental decontamination purposes (Montini et al 2010). Among them, ZnO is a versatile n-type semiconductor with a wide band gap of 3.37 eV, large exciton binding energy of 60 meV at room temperature, high catalytic activity, low cost and environmental friendliness character.…”