نتایج جستجو برای ' Visible light '

In this study, dye sensitized commercial and prepared nano ZnO were used in photocatalytic degradation of two main greenhouse gases, methane and carbon dioxide in a batch reactor under visible light. ZnO nanoparticles were produced by sonochemical method in high frequency. In order to activate nanoparticles in visible region, copper phthalocyanine was used. Calcinated commercial and prepared nano ZnO, after immobilizing the dye were analyzed by FTIR, SEM and UV-vis. SEM images showed that the dy...

 A composite semiconductor AgBr/Ag5P3O10 heterojunction has been synthesized by a simple one-step ion-exchange process in Br ionic liquids. All the as-obtained AgBr/Ag5P3O10 heterojunctions were characterized by X-ray powder diffraction (XRD), scanning electronic microscopy (SEM), transmission electronic microscopy (TEM), Brunauer–Emmett–Teller (BET), UV–vis absorption spectroscopy (UV–vis), photoluminescence (PL), and surface photovoltage (SPS) techniques....

 Several graphene–titania composites (G–TiO2) were synthesized by a sol–gel method using titanium isopropoxide (or P25) as Ti-precursors and reduced graphene oxide (RGO). The structural, morphological, and physicochemical properties of the samples were thoroughly investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), UV–vis diffuse reflectance (UV–vis DRS), and thermogravim...

 The boron doped cryptomelane prepared by a sol–gel method was employed as photocatalyst for the degradation of polyethylene (PE) film under the UV and visible light irradiation. The cryptomelane (OMS-2) and boron doped cryptomelane (B-OMS-2) were characterized by X-ray diffraction (XRD), laser particle size analysis, Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), UV–vis spectroscopy and porosimeter analysis. The resul...

 In this study, Bi2O3 with band gap energy of 2.6 eV was coated on a Ti disk and used in a rotating disk reactor to treat 10 mg L−1 Rhodamine B (RB) solution under UV and visible light irradiation. The effects of different inorganic anions (including CO2-3, S2−, SO2-4, F− and Cl−) were investigated and the results shown that the color removal efficiency could be greatly improved in the presence of Cl−. RB adsorption capacity could be enhanced when Cl− was...

 Exploring novel titania-based semiconductor photocatalysts with both high specific surface area and expanded visible light response is still a challenge. In this work, we report the first synthesis of mesoporous nitrogen-modified titania by a facile and convenient exfoliation–reassembling strategy. Ethylamine is used for the delamination of layered titanate, and meanwhile, also serves as a source of nitrogen. X-ray diffraction patterns and transmission electron microscopy images reve...

 An efficient heterogeneous catalyst poly-hydroxyl-iron/sepiolite (H-Fe-S) was successfully prepared for photo-assisted Fenton-like reaction by a simple impregnation method. The characterization results (XRD, XPS, BET) of the H-Fe-S catalyst suggested that hydroxyl-iron polycations were present in the sepiolite. The catalytic activity of the H-Fe-S catalyst was evaluated by the degradation, chemical oxygen demand (COD) and total organic carbon (TOC) removal of a xanthene dye rhodamine B (Rh...

 Zn2GeO4 nanobelts modified by CdS quantum dots (Zn2GeO4/CdS) were prepared successfully by chemical bath deposition. The novel photocatalyst was characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and UV–Vis diffuse reflectance spectroscopy. It was found that Zn2GeO4/CdS consisted of uniform rhombohedral phase Zn2GeO4 nanobelts with highly dispersed cubic phase CdS quantum dots, and the Zn2GeO4/CdS exhibited strong visible ligh...

 Graphitic carbon nitride (g-C3N4) was synthesized by directly thermal condensation of dicyandiamide and characterized by XRD, XPS, SEM, TEM and FT-IR. Then the as-prepared catalyst was employed to degrade priority pollutant 2,4,6-trichlorophenol (2,4,6-TCP) under visible light irradiation (λ > 420 nm). The 2,4,6-TCP could be completely mineralized over g-C3N4, and the pseudo-first-order rate constant for 10−4 M 2,4,6-TCP degradation was 0.70 h−1 in the presence of 1 g...

 Heterogeneous photocatalytic oxidation (PCO) has shown large potentials in controlling airborne gaseous pollutants such as volatile organic compounds (VOCs). This article addresses PCO of gaseous formaldehyde (HCHO) by VIS-active photocatalysts which were immobilized on polyester fiber filter through a spray coating method under room temperature. The coatings showed good dispersion and strong adhesion on the fiber surface as supported by the SEM images and the stability test result. High P...