Investigation of commercial PbCrO4/TiO2 for photodegradation of rhodamine B in aqueous solution by visible light

Abstract

This study throws light on utilization of visible light in removal dyes from wastewater using commercial PbCrO 4 /TiO 2 (P-25) composite which was prepared by grinding TiO 2 (P-25) with PbCrO 4 to decrease the adhesion properties of PbCrO 4 . As-prepared catalyst was characterized by DRS, XRD and N 2 adsorption-desorption. The morphology was examined by SEM. The photodegradation of rhodamine B (Rh B) product in the presence of PbCrO 4 / TiO 2 (P-25) composite was dependent on the pH of the medium. In 2 \ pH \ 10, Rh B was involved in photodegradation via N-deethylation terminated at rhodamine 110 while at pH = 2 rhodamine 110 underwent chromophore destruction. Obtained data showed that HO 2• /O 2•-species were involved in degradation of dye. Commercial PbCrO 4 /TiO 2 (P-25) composite is considered as good visible light-sensitive photocatalyst for removing Rh B.

High UV and Sunlight Photocatalytic Performance of Porous ZnO Nanostructures Synthesized by a Facile and Fast Microwave Hydrothermal Method

“…As explained before, the photoinduced carriers will originate • OH and O 2 •− radicals from the adsorbed oxygen-rich molecules on the ZnO surface, which will in turn participate in the degradation of RhB in the solution. On the other hand, it has been reported that RhB molecules can be excited by visible light [ 124 , 125 ]. When these molecules are adsorbed on the ZnO surface and are excited by visible light, the excited RhB* can inject electrons into the conduction band of ZnO followed by its conversion into cation radicals RhB •+ .…”

Novel TiO2/GO/CuFe2O4 nanocomposite: a magnetic, reusable and visible-light-driven photocatalyst for efficient photocatalytic removal of chlorinated pesticides from wastewater

“…3b), which is lower than that reported in the literature for pure TiO 2 (E g ¼ 3.2 eV). 9,14,16,35 The formation of the TiO 2 /GO/CuFe 2 O 4 nanocomposite causes a narrowing in the TiO 2 bandgap due to the good interactions between TiO 2 and GO in the nanocomposite structure; therefore, GO enhanced the absorption of TiO 2 in the visible light region.…”

“…13,14 However, TiO 2 has two major demerits: it possesses a wide bandgap energy value of 3.2 eV for pure anatase, which limits its activity under UV irradiation, and it exhibits rapid electron-hole recombination, which decreases its photocatalytic performance. 15,16 Various strategies, including doping by metallic/nonmetallic species, dye sensitization, as well as coupling with narrow bandgap semiconductors, have been developed to expand its photoresponse into the visible light region, decrease electron-hole pair recombination and increase its activity for the removal of toxic pollutants from industrial effluents. [17][18][19] Besides, an improvement in the photocatalytic activity of TiO 2 has been obtained by loading with carbonaceous materials, especially graphene and graphene oxide (GO), as promising supports for photocatalysts owing to their high carrier mobility and large specic surface area, allowing them consideration.…”

Effect of Various Forms of Aluminum 6082 on the Mechanical Properties, Microstructure and Surface Modification of the Profile after Extrusion Process

“…Characteristic needles appear in the microstructure. These needles are lead-chromium oxide (similar to [54] or [37], in which lead-chromium oxide was crocoite in the form of longitudinal crystallites), which gives the surface a greenish-yellowish color.…”

“…Although methods for modifying the aluminum surface by anodizing and further processing are known [23,24,27,28,32,33,36,37], such tests have not been performed on recycled alloy 6082. This article shows practical examples of surface treatment of 6082 alloy: solid and its scrap.…”