Integration of ZnO with g-C3N4 structures in core–shell approach via sintering process for rapid detoxification of water under visible irradiation

Pawar, Rajendra C.; Son, Yeon-Ho; Kim, Jong-Ryul; Ahn, Sung‐Hoon; Lee, Caroline Sunyong

doi:10.1016/j.cap.2015.11.002

Cited by 61 publications

(11 citation statements)

References 26 publications

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“…Visible light photocatalysis has inspired great interest, offering a sustainable pathway to drive a series of photooxidation reactions, water splitting, and so on. − The search for highly active and low-cost photocatalysts has been a continuing worldwide endeavor. − Wide band gap semiconductors such as ZnO and TiO 2 have been explored a great deal, but their main issue is that the photocatalytic response is mainly initiated in the near-UV or UV region to execute the photocatalytic behavior. Thus, the presence of a UV light source is necessary. , The emergence of organic semiconductors, such as polymeric carbon nitride (C 3 N 4 ), provides a new chance for the development of high-performance photocatalysts in the visible light region. − Many efforts have been employed to enhance their photocatalytic activity, such as metal/nonmetal doping, , surface heterojunction design, , texture and morphology engineering, − etc. The surface area and photocatalytic ability have been improved significantly; however, the accompanying disordered structure caused a large amount of defects in the final product. , In addition, these structure defects extremely limit electron–hole separation and transport, which are key rate-determining steps in the photocatalysis …”

Section: Introductionmentioning

confidence: 99%

Remedying Defects in Carbon Nitride To Improve both Photooxidation and H₂ Generation Efficiencies

et al. 2016

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The outstanding visible light response of carbon nitride has aroused intense expectations regarding its photocatalysis, but it is impeded by the inevitable defects. Here, we report on a facile melamine-based defect-remedying strategy and resultant carbon nitride high-performance photocatalysts (R-C 3 N 4 ). Melamine with amino groups and a triazine structure was selected as a "little patch" to passivate and remedy various defects inside carbon nitride. Such a remedying effect has been comprehensively proven by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) analyses, and the ninhydrin test. In addition, their effects on photocatalysis were also individually confirmed by chemical methods, including cyano reduction reactions and deamination reactions. Furthermore, melamine remediation can result in g-C 3 N 4 /mpg-C 3 N 4 junctions, which also favors electron transfer and charge separation during the photocatalytic reaction. In order to explore its broader applications, R-C 3 N 4 was used as a photocatalyst for the photooxidation reaction of 1,4dihydro-2,6-dimethylpyridine-3,5-dicarboxylate (1,4-DHP) and simultaneous H 2 evolution. The conversion rates of 1,4-DHP and H 2 production catalyzed by R-C 3 N 4 were enhanced 2 and 6.5 times, respectively. This rational design is beneficial for the conversion of 1,4-DHP during the preparation of bioactive compounds and clean hydrogen production at the same time.

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Section: Introductionmentioning

confidence: 99%

Remedying Defects in Carbon Nitride To Improve both Photooxidation and H₂ Generation Efficiencies

et al. 2016

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“…Different methods have been applied in treating and removing these contaminants from wastewater like flocculation, adsorption, membrane separation and advanced oxidation process (heterogenous catalysis) [ 2 – 10 ]. Out of the various methodologies and removal methods, development of advanced photo-catalysts remains a “method of choice” for complete degradation of hazardous environmental pollutants (found in drinking water supplies and waste water streams) into harmless carbon dioxide and water [ 10 – 20 ]. Photo-catalysis uses light-sensitive catalysts to accelerate chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of light harvesting semiconductor bismuth oxychloride nano photo-catalysts for efficient removal of hazardous organic pollutants

et al. 2017

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In the present work, bismuth oxychloride nanoparticles–a light harvesting semiconductor photocatalyst–were synthesized by a facile hydrolysis route, with sodium bismuthate and hydroxylammonium chloride as the precursor materials. The as-synthesized semiconductor photocatalysts were characterized using X-ray diffraction analysis, Fourier transform infra-red spectroscopy, Raman spectroscopy, Field emission scanning electron microscopy, X-ray photoelectron spectroscopy and Photoluminescence spectroscopy techniques. The crystal structure, morphology, composition, and optical properties of these facile synthesized bismuth oxychloride nanoparticles (BiOCl NPs) were compared to those of traditional bismuth oxychloride. In addition, the photocatalytic performance of facile-synthesized BiOCl NPs and traditional BiOCl, as applied to the removal of hazardous organic dyes under visible light illumination, is thoroughly investigated. Our results reveal that facile-synthesized BiOCl NPs display strong UV-Vis light adsorption, improved charge carrier mobility and an inhibited rate of charge carrier recombination, when compared to traditional BiOCl. These enhancements result in an improved photocatalytic degradation rate of hazardous organic dyes under UV-Vis irradiance. For instance, the facile-synthesized BiOCl NPs attained 100% degradation of methylene blue and methyl orange dyes in approximately 30 mins under UV-Vis irradiation, against 55% degradation for traditional BiOCl under similar experimental conditions.

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“…At a lower initial concentration of dye, the less efficiency may be due to less amount of dye adsorbed on the catalyst surface [44]. However, at a higher concentration of dye, the decrease in the degradation efficiency may be due to the decreasing of penetration of light photon or suppressing path length of photons [45]. It is apparent from Fig.…”

Section: Effect Of Initial Dye Concentrationmentioning

confidence: 93%

Fabrication of g-C3N4/ZnO Nanoheterostructures for Effective Degradation of Methylene Blue Dye under Visible Light Irradiation

Meena

Poswal²,

Surela³

et al. 2022

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In the present, the g-C3N4/ZnO hybrid nanoheterostructures photocatalysts with different weight percents of ZnO have been successfully prepared by a facile grinding, dehydration followed by pyrolysis method. The structural and textural properties of the prepared samples were investigated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy combine electron dispersive spectroscopy (FESEM-EDS) and UV-vis spectroscopy. The photocatalytic performance of the fabricated g-C3N4/ZnO nanostructures was investigated for the degradation of methylene blue (MB) dye and it is determined much higher in compare to the bare g-C3N4 nanosheets and ZnO nanorods. The optimized ZnO content in the g-C3N4/ZnO photocatalyst was determined to be 25%. In the current study, 99.54% of MB dye is degraded in 60 min of visible light irradiation at pH = 10 over g-C3N4/ZnO (25%) photocatalyst. The results of the kinetic study reveals that photodegradation reactions have followed the first-order kinetics and the rate constant values of MB photodegradation in presence of prepared g-C3N4/ZnO (25%) is determined ∼13 and ∼7.76 times greater than that of the bare g-C3N4 and ZnO respectively. The enhanced photocatalytic efficiency of the fabricated g-C3N4/ZnO nanoheterostructures could be due to the creation of heterojunction by the coupling of two semiconductors of well matched band structures in which effective charge transfer has been occurred. The prepared g-C3N4/ZnO has demonstrated significant photostability after utilization in four runs of cycles. The decrease in the catalyst performance even after four repeated cycles is approximately 8%. The superoxide free radicals (•O2−) are the main reactive species participated in the degradation of MB dye. The current approach of fabrication of heterojunction has presented a competent and simplistic synthetic tactic of creation of visible-light-driven photocatalyst for the effective photocatalytic mineralization of organic dye contaminants in the aqueous medium.

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Integration of ZnO with g-C3N4 structures in core–shell approach via sintering process for rapid detoxification of water under visible irradiation

Cited by 61 publications

References 26 publications

Remedying Defects in Carbon Nitride To Improve both Photooxidation and H₂ Generation Efficiencies

Remedying Defects in Carbon Nitride To Improve both Photooxidation and H₂ Generation Efficiencies

Facile synthesis of light harvesting semiconductor bismuth oxychloride nano photo-catalysts for efficient removal of hazardous organic pollutants

Fabrication of g-C3N4/ZnO Nanoheterostructures for Effective Degradation of Methylene Blue Dye under Visible Light Irradiation

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Integration of ZnO with g-C3N4 structures in core–shell approach via sintering process for rapid detoxification of water under visible irradiation

Cited by 61 publications

References 26 publications

Remedying Defects in Carbon Nitride To Improve both Photooxidation and H2 Generation Efficiencies

Remedying Defects in Carbon Nitride To Improve both Photooxidation and H2 Generation Efficiencies

Facile synthesis of light harvesting semiconductor bismuth oxychloride nano photo-catalysts for efficient removal of hazardous organic pollutants

Fabrication of g-C3N4/ZnO Nanoheterostructures for Effective Degradation of Methylene Blue Dye under Visible Light Irradiation

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Remedying Defects in Carbon Nitride To Improve both Photooxidation and H₂ Generation Efficiencies

Remedying Defects in Carbon Nitride To Improve both Photooxidation and H₂ Generation Efficiencies