Abstract:The synthesis of ZnS/TiO 2 nanocomposite was successfully performed by a chemical deposition method. The structure and morphology of the prepared catalyst were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and FT-IR spectroscopy. The activity of the photocatalyst was evaluated for the removal of Acid Blue 113 (AB113) dye in aqueous solution under UV-A radiation. Response surface methodology (RSM) based on the central composite rotatable design (CCR… Show more
“…The increase in the total amount of the catalyst increases the number of active sites on the nanocomposite surface which, in turn, increases the generation of • OH radicals and hence the AB113 removal. This behavior was observed by other authors as well 5 . The observed adsorption was of very less compared to the photocatalytic degradation and also there is no self degradation of the dye (Fig.…”
Section: Resultssupporting
confidence: 88%
“…The increase in the total amount of the catalyst increases the number of active sites on the nanocomposite surface which, in turn, increases the generation of · OH radicals and hence the AB113 removal. This behavior was observed by other authors as well 5 . Figure 8 Photocatalytic degradation of AB113 ( a ) Adsorption and self-degradation plots along with the comparison of photocatalytic activity of TiO 2 , BiVO 4 and the three nanocomposite ratios [AB113] 0 = 40 mg/l, [nanocomposite, TiO 2 , BiVO 4 ] = 1 g/l pH 0 = 6.…”
Section: Resultssupporting
confidence: 88%
“…Pollutants present in the industrial effluents are classified as toxins, carcinogens, mutagens, teratogens, and endocrine-disrupting agents 4 . Particularly, the presence of dyes in industrial effluents leads to a decreased penetration of sunlight and a reduction of the photosynthetic activities in aquatic ecosystems, as well as an increase in the biochemical oxygen demand 5 . The dyes are specified as dispersive dyes (polyester, nylon and acetate) 6 , reactive dyes ( Safira dye, HEXL ) 7 , sulphur dyes, and vat dyes (viscous) 8 .…”
Section: Introductionmentioning
confidence: 99%
“…However, the chemical structure of azo dyes leads to recalcitrant characteristics, i.e., they degrade slowly under natural conditions, and they are also resistant to conventional wastewater treatment processes 6 . For this reason, Advanced Oxidation Processes (AOPs), have received a widespread attention in recent years, since they are a very convenient water treatment method that eliminates these types of contaminants 5 , 7 . Among AOPs, photocatalysis is considered as a green alternative to attain an efficient purification of polluted water 12 , 13 .…”
Nanocomposites with different ratios of titanium dioxide and bismuth vanadate [TiO 2 ]/[BiVO 4 ] give rise to compatible electronic band structure alignment at their interfaces to ensure enhanced photoactivated charge transfer under visible light. The sol-gel method and suitable post-synthesis thermal treatments were used to synthesize different compositions with stabilized anatase phase of tio 2 and monoclinic scheelite polymorph BiVo 4. Structural, electronic and optical characterizations were performed and the results were analysed as a function of the stoichiometry, in which both crystalline structures show a clear junction formation among their characteristic stacking planes. Photocatalytic and (photo) electrochemical responses of the nanocomposites were investigated and tested for the degradation of azo dyes (Acid Blue-113, AB-113) (~ 99%) under visible light radiation. The nanocomposite with a mass ratio of (1:10) shows the highest photocatalytic efficiency compared to the other compositions. HRTEM images showed marked regions in which both crystalline structures form a clear junction and their characteristic planes. However, the increase of BiVO 4 content in the network overcomes the photocatalytic activity due to the decrease in the reduction potential of the photo-generated electrons with high recombination rates. Due to rapid increase in population and the world's rapid industrialization, natural water bodies are being heavily contaminated with industrial wastes 1,2,3. Pollutants present in the industrial effluents are classified as toxins, carcinogens, mutagens, teratogens, and endocrine-disrupting agents 4. Particularly, the presence of dyes in industrial effluents leads to a decreased penetration of sunlight and a reduction of the photosynthetic activities in aquatic ecosystems, as well as an increase in the biochemical oxygen demand 5. The dyes are specified as dispersive dyes (polyester, nylon and acetate) 6 , reactive dyes (Safira dye, HEXL) 7 , sulphur dyes, and vat dyes (viscous) 8. The Azo dyes are colorants that fall under all of the above-mentioned categories. They contain one or more-N=N-groups in their chemical structure, which consists of highly substituted aromatic rings 9. To ensure water purification, several known methods are well-established: desalination, distillation, filtration, flocculation, reverse osmosis, and sedimentation 10,11 , etc. However, the chemical structure of azo dyes leads to recalcitrant characteristics, i.e., they degrade slowly under natural conditions, and they are also resistant to conventional wastewater treatment processes 6. For this reason, Advanced Oxidation Processes (AOPs), have received a widespread attention in recent years, since they are a very convenient water treatment method that eliminates these types of contaminants 5,7. Among AOPs, photocatalysis is considered as a green alternative to attain an efficient purification of polluted water 12,13. Furthermore, the implementation of photoactive nanomaterials in water treatment show outstanding resul...
“…The increase in the total amount of the catalyst increases the number of active sites on the nanocomposite surface which, in turn, increases the generation of • OH radicals and hence the AB113 removal. This behavior was observed by other authors as well 5 . The observed adsorption was of very less compared to the photocatalytic degradation and also there is no self degradation of the dye (Fig.…”
Section: Resultssupporting
confidence: 88%
“…The increase in the total amount of the catalyst increases the number of active sites on the nanocomposite surface which, in turn, increases the generation of · OH radicals and hence the AB113 removal. This behavior was observed by other authors as well 5 . Figure 8 Photocatalytic degradation of AB113 ( a ) Adsorption and self-degradation plots along with the comparison of photocatalytic activity of TiO 2 , BiVO 4 and the three nanocomposite ratios [AB113] 0 = 40 mg/l, [nanocomposite, TiO 2 , BiVO 4 ] = 1 g/l pH 0 = 6.…”
Section: Resultssupporting
confidence: 88%
“…Pollutants present in the industrial effluents are classified as toxins, carcinogens, mutagens, teratogens, and endocrine-disrupting agents 4 . Particularly, the presence of dyes in industrial effluents leads to a decreased penetration of sunlight and a reduction of the photosynthetic activities in aquatic ecosystems, as well as an increase in the biochemical oxygen demand 5 . The dyes are specified as dispersive dyes (polyester, nylon and acetate) 6 , reactive dyes ( Safira dye, HEXL ) 7 , sulphur dyes, and vat dyes (viscous) 8 .…”
Section: Introductionmentioning
confidence: 99%
“…However, the chemical structure of azo dyes leads to recalcitrant characteristics, i.e., they degrade slowly under natural conditions, and they are also resistant to conventional wastewater treatment processes 6 . For this reason, Advanced Oxidation Processes (AOPs), have received a widespread attention in recent years, since they are a very convenient water treatment method that eliminates these types of contaminants 5 , 7 . Among AOPs, photocatalysis is considered as a green alternative to attain an efficient purification of polluted water 12 , 13 .…”
Nanocomposites with different ratios of titanium dioxide and bismuth vanadate [TiO 2 ]/[BiVO 4 ] give rise to compatible electronic band structure alignment at their interfaces to ensure enhanced photoactivated charge transfer under visible light. The sol-gel method and suitable post-synthesis thermal treatments were used to synthesize different compositions with stabilized anatase phase of tio 2 and monoclinic scheelite polymorph BiVo 4. Structural, electronic and optical characterizations were performed and the results were analysed as a function of the stoichiometry, in which both crystalline structures show a clear junction formation among their characteristic stacking planes. Photocatalytic and (photo) electrochemical responses of the nanocomposites were investigated and tested for the degradation of azo dyes (Acid Blue-113, AB-113) (~ 99%) under visible light radiation. The nanocomposite with a mass ratio of (1:10) shows the highest photocatalytic efficiency compared to the other compositions. HRTEM images showed marked regions in which both crystalline structures form a clear junction and their characteristic planes. However, the increase of BiVO 4 content in the network overcomes the photocatalytic activity due to the decrease in the reduction potential of the photo-generated electrons with high recombination rates. Due to rapid increase in population and the world's rapid industrialization, natural water bodies are being heavily contaminated with industrial wastes 1,2,3. Pollutants present in the industrial effluents are classified as toxins, carcinogens, mutagens, teratogens, and endocrine-disrupting agents 4. Particularly, the presence of dyes in industrial effluents leads to a decreased penetration of sunlight and a reduction of the photosynthetic activities in aquatic ecosystems, as well as an increase in the biochemical oxygen demand 5. The dyes are specified as dispersive dyes (polyester, nylon and acetate) 6 , reactive dyes (Safira dye, HEXL) 7 , sulphur dyes, and vat dyes (viscous) 8. The Azo dyes are colorants that fall under all of the above-mentioned categories. They contain one or more-N=N-groups in their chemical structure, which consists of highly substituted aromatic rings 9. To ensure water purification, several known methods are well-established: desalination, distillation, filtration, flocculation, reverse osmosis, and sedimentation 10,11 , etc. However, the chemical structure of azo dyes leads to recalcitrant characteristics, i.e., they degrade slowly under natural conditions, and they are also resistant to conventional wastewater treatment processes 6. For this reason, Advanced Oxidation Processes (AOPs), have received a widespread attention in recent years, since they are a very convenient water treatment method that eliminates these types of contaminants 5,7. Among AOPs, photocatalysis is considered as a green alternative to attain an efficient purification of polluted water 12,13. Furthermore, the implementation of photoactive nanomaterials in water treatment show outstanding resul...
“…Metal Ti has the characteristics of light weight, high strength and biological compatibility etc. [ 55 , 56 , 57 ]. For example, Esen et al deposited metal Ti films on a polyamide/cotton fabric (The textile material is composed of cotton and polyamide in different ratios) to develop a kind of electromagnetic wave absorbing fabric, which can be applied in radio communication and radar aspects [ 58 ].…”
Section: Application Of Fabrics Coated With Magnetron Sputtering Nmentioning
The applications of magnetron sputtering technology on the surface coating of fabrics have attracted more and more attention from researchers. Over the past 15 years, researches on magnetron sputtering coated fabrics have been mainly focused on electromagnetic shielding, bacterial resistance, hydrophilic and hydrophobic properties and structural color etc. In this review, recent progress of the technology is discussed in detail, and the common target materials, technologies and functions and characterization of coated fabrics are summarized and analyzed. Finally, the existing problems and future prospects of this developing field are briefly proposed and discussed.
Photocatalytic activity of bi-metal oxides SnO-TiO 2 -AC photocatalyst was evaluated in methylene blue (MB) dye degradation In this study, a three-level, four-factor, D-optimal experimental design, combined with response surface methodology, was employed to optimize the photocatalytic degradation process of MB dye in a batch reactor. Effectiveness of essential process variables: light intensity (254-400 nm), initial dye concentration (100-200 ppm), photocatalyst dose (0.5-1.5 g/L), and irradiation time (1-5 h) were investigated, modeled, and optimized successfully. To determine the process efficiency, the final concentration of dye together with degradation percentage was defined as response variables. Analysis of variance indicated that the proposed quadratic polynomial models agreed with the experimental study with R 2 and p-value of 0.9211, p < 0.001 and 0.8166, p < 0.05 for a final concentration of dye and degradation percentage, respectively. Numerical optimization was carried out based on the desirability function for maximum dye removal. Accordingly, dye removal conditions resulted in light intensity, initial dye concentration, photocatalyst dose, and irradiation time of 400 nm of visible light, 100 ppm, 1.5 g/L, and 3.77 h, respectively. Under these optimal conditions, the final dye concentration and degradation percentage were 4.713 ppm and 95.28%. According to Pareto analysis, the order of the operating variables on the dye degradation efficiency was: photocatalyst does < irradiation time < light intensity < initial concentration of dye.
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