A comparative study on the effect of different precursors for synthesis and efficient photocatalytic activity of g-C3N4/TiO2/bentonite nanocomposites

Mishra, Amit; Mehta, Akansha; Kainth, Shagun; Basu, Soumen

doi:10.1007/s10853-018-2565-0

Cited by 37 publications

(15 citation statements)

References 69 publications

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“…17 Mishra et al reported effective interaction among thin GCN nanosheets from the urea precursor over thiourea with TiO 2 /bentonite toward photocatalytic degradation of the reactive brilliant red-X3BS dye. 18 Formation of composites among GCN and other metaloxide semiconductors is one of the most effective and convenient method among other modification techniques as it can overcome the problem of rapid recombination of photogenerated charge carriers and also enhance the response of the photocatalyst toward light. 19−25 Recently, ZnO-modified GCN has been reported to exhibit prominent catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

ZnO-Modified g-C₃N₄: A Potential Photocatalyst for Environmental Application

et al. 2020

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Solar energy-driven practices using semiconducting materials is an ideal approach toward wastewater remediation. In order to attain a superior photocatalyst, a composite of g-C 3 N 4 and ZnO (GCN−ZnO) has been prepared by one-step thermal polymerization of urea and zinc carbonate basic dihydrate [ZnNO 3 ] 2 •[Zn(OH) 2 ] 3 . The GCN−ZnO0.4 sample showed an evolved morphology, increased surface area (116 m 2 g −1 ), better visible light absorption ability, and reduced band gap in comparison to GCN−pure. The GCN−ZnO0.4 sample also showed enhanced adsorption and photocatalytic activity performance, resulting in an increased reaction rate value up to 3 times that of GCN−pure, which was attributed to the phenomenon of better separation of photogenerated charge carriers resulting because of heterojunction development among interfaces of GCN−pure and ZnO. In addition, the GCN−ZnO0.4 sample showed a decent stability for four cyclic runs and established its potential use for abatement of organic wastewater pollutants in comparison to GCN− pure.

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Section: Introductionmentioning

confidence: 99%

ZnO-Modified g-C₃N₄: A Potential Photocatalyst for Environmental Application

et al. 2020

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“…As shown in Figure 6 d, the kaolin/CeO 2 /g-C 3 N 4 composite exhibited excellent catalytic performance after four reaction cycles, demonstrating its recyclability and structural stability. The possible mechanism of the photocatalytic degradation of CIP over g-C 3 N 4 /TiO 2 /bentonite nanocomposite was proposed, as illustrated in Figure 7 [ 50 , 51 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Novel Kaolin-Supported g-C3N4/CeO2 Composites with Enhanced Photocatalytic Removal of Ciprofloxacin

Huang

et al. 2020

Materials

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Herein, novel ternary kaolin/CeO2/g-C3N4 composite was prepared by sol-gel method followed by hydrothermal treatment. The self-assembled 3D “sandwich” structure consisting of kaolin, CeO2 and g-C3N4 nanosheets, was systematically characterized by appropriate techniques to assess its physicochemical properties. In the prerequisite of visible-light irradiation, the removal efficiency of ciprofloxacin (CIP) over the kaolin/CeO2/g-C3N4 composite was about 90% within 150 min, 2-folds higher than those of pristine CeO2 and g-C3N4. The enhanced photocatalytic activity was attributed to the improved photo-induced charge separation efficiency and the large specific surface area, which was determined by electrochemical measurements and N2 physisorption methods, respectively. The synergistic effect between the kaolin and CeO2/g-C3N4 heterostructure improved the photocatalytic performance of the final solid. The trapping and electron paramagnetic resonance (EPR) experiments demonstrated that the hole (h+) and superoxide radicals (•O2−) played an important role in the photocatalytic process. The photocatalytic mechanism for CIP degradation was also proposed based on experimental results. The obtained results revealed that the kaolin/CeO2/g-C3N4 composite is a promising solid catalyst for environmental remediation.

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“…It is well recognized that the morphology modifies the electronic structure with the creation of new surface states [23]. Therefore, it is noteworthy that the band gap of C 3 N 4 varies depending on the precursor used, as reported in the literature [24,25].…”

Section: Introductionmentioning

confidence: 85%

Influence of C3N4 Precursors on Photoelectrochemical Behavior of TiO2/C3N4 Photoanode for Solar Water Oxidation

et al. 2020

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Photoelectrochemical water splitting is considered as a long-term solution for the ever-increasing energy demands. Various strategies have been employed to improve the traditional TiO2 photoanode. In this study, TiO2 nanorods were decorated by graphitic carbon nitride (C3N4) derived from different precursors such as thiourea, melamine, and a mixture of thiourea and melamine. Photoelectrochemical activity of TiO2/C3N4 photoanode can be modified by tuning the number of precursors used to synthesize C3N4. C3N4 derived from the mixture of melamine and thiourea in TiO2/C3N4 photoanode showed photocurrent density as high as 2.74 mA/cm2 at 1.23 V vs. RHE. C3N4 synthesized by thiourea showed particle-like morphology, while melamine and melamine with thiourea derived C3N4 yielded two dimensional (2D) nanosheets. Nanosheet-like C3N4 showed higher photoelectrochemical performance than that of particle-like nanostructures as specific surface area, and the redox ability of nanosheets are believed to be superior to particle-like nanostructures. TiO2/C3N4 displayed excellent photostability up to 20 h under continuous illumination. Thiourea plays an important role in enhancing the photoelectrochemical performance of TiO2/C3N4. This study emphasizes the fact that the improved photoelectrochemical performance can be achieved by varying the precursors of C3N4 in TiO2/C3N4 heterojunction. This is the first report to show the influence of C3N4 precursors on photoelectrochemical performance in TiO2/C3N4 systems. This would pave the way to explore different precursors influence on C3N4 with respect to the photoelectrochemical response of TiO2/C3N4 heterojunction photoanode.

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A comparative study on the effect of different precursors for synthesis and efficient photocatalytic activity of g-C3N4/TiO2/bentonite nanocomposites

Cited by 37 publications

References 69 publications

ZnO-Modified g-C₃N₄: A Potential Photocatalyst for Environmental Application

ZnO-Modified g-C₃N₄: A Potential Photocatalyst for Environmental Application

Synthesis of Novel Kaolin-Supported g-C3N4/CeO2 Composites with Enhanced Photocatalytic Removal of Ciprofloxacin

Influence of C3N4 Precursors on Photoelectrochemical Behavior of TiO2/C3N4 Photoanode for Solar Water Oxidation

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A comparative study on the effect of different precursors for synthesis and efficient photocatalytic activity of g-C3N4/TiO2/bentonite nanocomposites

Cited by 37 publications

References 69 publications

ZnO-Modified g-C3N4: A Potential Photocatalyst for Environmental Application

ZnO-Modified g-C3N4: A Potential Photocatalyst for Environmental Application

Synthesis of Novel Kaolin-Supported g-C3N4/CeO2 Composites with Enhanced Photocatalytic Removal of Ciprofloxacin

Influence of C3N4 Precursors on Photoelectrochemical Behavior of TiO2/C3N4 Photoanode for Solar Water Oxidation

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ZnO-Modified g-C₃N₄: A Potential Photocatalyst for Environmental Application

ZnO-Modified g-C₃N₄: A Potential Photocatalyst for Environmental Application