Tuning the wettability and photocatalytic efficiency of heterostructure ZnO-SnO2 composite films with annealing temperature

Upadhaya, Diliraj; Talinungsang,; Kumar, Pankaj; Purkayastha, Debarun Dhar

doi:10.1016/j.mssp.2019.02.009

Cited by 29 publications

(7 citation statements)

References 40 publications

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“…It means that the optimum concentration of SGCN to enhance photocatalytic activity is 50%. The photocatalytic effectiveness of the 7% Co-SnO 2 /50% SGCN NC is higher than that of the previously reported composites because Co-SnO 2 and SGCN successfully formed good heterojunctions [60][61][62][63][64][65][66][67][68]. The transport and separation of e − and h + in the composite also be facilitated by cobalt atoms.…”

Section: Photocatalytic Studymentioning

confidence: 68%

Fabrication of Effective Co-SnO2/SGCN Photocatalysts for the Removal of Organic Pollutants and Pathogen Inactivation

et al. 2023

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Substantial improvement is needed in efficient and affordable decolorization and disinfection methods to solve the issues caused by dyes and harmful bacteria in water and wastewater. This work involves the photocatalytic degradation of methylene blue (MB) as well as gram-negative and gram-positive bacteria by cobalt-doped tin oxide (Co-SnO2) nanoparticles (NPs) and Co-SnO2/SGCN (sulfur-doped graphitic carbon nitride) nanocomposites (NCs) under sunlight. The coprecipitation approach was used to synthesize the photocatalysts. Maximum methylene blue (MB) photocatalytic degradation was seen with the 7% Co-SnO2 NPs compared to other (1, 3, 5, and 9 wt.%) Co-SnO2 NPs. The 7% Co-SnO2 NPs were then homogenized with different amounts (10, 30, 50, and 70 weight %) of sulfur-doped graphitic carbon nitride (SGCN) to develop Co-SnO2/SGCN heterostructures with the most significant degree of MB degradation. The synthesized samples were identified by modern characterization methods such as FT-IR, SEM, EDX, UV-visible, and XRD spectroscopies. The Co-SnO2/50% SGCN composites showed a significant increase in MB degradation and degraded 96% of MB after 150 min of sunlight irradiation. Both gram-negative (E. coli) and gram-positive (B. subtiles) bacterial strains were subjected to antibacterial activity. All samples were shown to have vigorous antibacterial activity against gram-positive and gram-negative bacteria, but the Co-SnO2/50% SGCNcomposites exhibited the maximum bactericidal action. Thus, the proposed NC is an efficient organic/inorganic photocatalyst that is recyclable and stable without lowering efficiency. Hence, Co-SnO2/50% SGCNNC has the potential to be employed in water treatment as a dual-functional material that simultaneously removes organic pollutants and eradicates bacteria.

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Section: Photocatalytic Studymentioning

confidence: 68%

Fabrication of Effective Co-SnO2/SGCN Photocatalysts for the Removal of Organic Pollutants and Pathogen Inactivation

et al. 2023

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“…The photocatalytic reaction mechanism is explained using the Langmuir-Hinshelwood model. 49 In this model, MB adsorption is required before photo-degradation to produce enhanced photocatalytic activity performance. As a result of the charge difference between SnO 2 nanoparticles (negative charges) and MB molecules (positive charges) and when the photo-catalyst degradation is occurring.…”

Section: Resultsmentioning

confidence: 99%

SnO₂ Nanoparticles: Green Synthesis, Characterization, and Water Treatment

Salwa

Ahmed

Wasly

et al. 2022

ECS J. Solid State Sci. Technol.

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The green synthesis approach was utilized to synthesize tin dioxide (SnO2) nanoparticles (NPs) using Ocimum Basilicum leaves extract with different concentrations (10, 15, and 20 ml) and different reaction temperatures (30, 60, and 90°C). The green synthesis method is considered economical, environmentally friendly, and non-toxic. X-ray diffraction patterns of the synthesized SnO2 NPs have displayed a tetragonal crystalline structure. The crystallite size of SnO2 NPs increased from 15.12 to 17.9 nm with increasing reaction temperature while decreasing from 20.68 to 17.9 nm with increasing extract concentrations. The morphology of the synthesized SnO2 NPs was investigated using high-energy transmission electron microscopy. The optical energy gap was determined using the diffuse reflectance UV-Vis spectra range (300-1200) nm of SnO2 NPs at different reaction temperatures and different extract concentrations. UV/Visible Spectrophotometry was used for studying the photodegradation of methylene blue dye (MB) dye. The photocatalytic degradation of MB revealed that SnO2 NPs at reaction temperature 90oC degraded 69% of MB solution when exposed to UV illumination for 90 minutes while the degradation reaches 90% for 180 minutes of exposure. It was obvious that the degradation rate of MB was increased with the increase of reaction temperature, and the extract concentration.

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“…An increase in the permeate flux upon light illumination has been attributed to the photocatalytic degradation of the organic substances deposited on the membrane surface 27 , 48 , 49 . Also, such photocatalytic membranes have demonstrated that they exhibit a time-dependent evolution of the surface chemistry heterogeneity (e.g., clean and contaminated regions) upon light illumination which can be quantitatively described by the contact angle measurements 6 , 22 , 50 – 52 . To our knowledge, quantitative relationships of the evolution of surface chemistry heterogeneity on a membrane surface and that of permeate flux upon visible light illumination are lacking.…”

Section: Introductionmentioning

confidence: 99%

Predicting kinetics of water-rich permeate flux through photocatalytic mesh under visible light illumination

Shrestha

Ezazi

Rad

et al. 2021

Sci Rep

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Membrane-based separation technologies are attractive to remediating unconventional water sources, including brackish, industrial, and municipal wastewater, due to their versatility and relatively high energy efficiency. However, membrane fouling by dissolved or suspended organic substances remains a primary challenge which can result in an irreversible decline of the permeate flux. To overcome this, membranes have been incorporated with photocatalytic materials that can degrade these organic substances deposited on the surface upon light illumination. While such photocatalytic membranes have demonstrated that they can recover their inherent permeability, less information is known about the effect of photocatalysis on the kinetics of the permeate flux. In this work, a photocatalytic mesh that can selectively permeate water while repelling oil was fabricated by coating a mixture of nitrogen-doped TiO2 (N-TiO2) and perfluorosilane-grafted SiO2 (F-SiO2) nanoparticles on a stainless steel mesh. Utilizing the photocatalytic mesh, the time-dependent evolution of the water-rich permeate flux as a result of photocatalytic degradation of the oil was studied under the visible light illumination. A mathematical model was developed that can relate the photocatalytic degradation of the organic substances deposited on a mesh surface to the evolution of the permeate flux. This model was established by integrating the Langmuir–Hinshelwood kinetics for photocatalysis and the Cassie–Baxter wettability analysis on a chemically heterogeneous mesh surface into a permeate flux relation. Consequently, the time-dependent water-rich permeate flux values are compared with those predicted by using the model. It is found that the model can predict the evolution of the water-rich permeate flux with a goodness of fit of 0.92.

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Tuning the wettability and photocatalytic efficiency of heterostructure ZnO-SnO2 composite films with annealing temperature

Cited by 29 publications

References 40 publications

Fabrication of Effective Co-SnO2/SGCN Photocatalysts for the Removal of Organic Pollutants and Pathogen Inactivation

Fabrication of Effective Co-SnO2/SGCN Photocatalysts for the Removal of Organic Pollutants and Pathogen Inactivation

SnO₂ Nanoparticles: Green Synthesis, Characterization, and Water Treatment

Predicting kinetics of water-rich permeate flux through photocatalytic mesh under visible light illumination

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Tuning the wettability and photocatalytic efficiency of heterostructure ZnO-SnO2 composite films with annealing temperature

Cited by 29 publications

References 40 publications

Fabrication of Effective Co-SnO2/SGCN Photocatalysts for the Removal of Organic Pollutants and Pathogen Inactivation

Fabrication of Effective Co-SnO2/SGCN Photocatalysts for the Removal of Organic Pollutants and Pathogen Inactivation

SnO2 Nanoparticles: Green Synthesis, Characterization, and Water Treatment

Predicting kinetics of water-rich permeate flux through photocatalytic mesh under visible light illumination

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SnO₂ Nanoparticles: Green Synthesis, Characterization, and Water Treatment