Influence of TiO2 morphology on the photocatalytic efficiency of direct Z-scheme g-C3N4/TiO2 photocatalysts for isoniazid degradation

Jo, Wan-Kuen; Natarajan, Thillai Sivakumar

doi:10.1016/j.cej.2015.06.120

Cited by 328 publications

(98 citation statements)

References 55 publications

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“…From the trapping experiments toward TiO 2 and g-C 3 N 4 , it is found that the most difference between them during the degradation process under visible light in the aspect of effective species is that the photogenerated holes in the valence band of TiO 2 is active, but inactive for g-C 3 N 4 . Such the conclusion is different from the common reported literatures in which the difference is thought to be whether there are OH − species according the compassion of calculated potent ion of BCB and TVB with the SRP of corresponding reactions214963. At the same time, the conclusion is very important to the analysis of charge transfer model and mechanism of enhanced photocatalytic activity of g-C 3 N 4 /TiO 2 nanocomposite.…”

Section: Resultscontrasting

confidence: 65%

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A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

Liu

Chen

et al. 2016

Sci Rep

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The g-C3N4-coupling TiO2 photocatalysts with controllable particle size as well as the interface contact were prepared by a general nonaqueous sol-gel method. The structural and morphological features of g-C3N4/TiO2 were investigated through the X-ray diffraction, Fourier transformed infrared spectra, scanning electron microscopy and transmission electron microscopy, respectively. It is found the TiO2 nanoparticles with a size of 7.3 ± 1.6 nm are uniformly anchored on the surface of the g-C3N4 nanosheets in isolation. The photocatalytic properties of as-prepared g-C3N4/TiO2 were tested by degradation of Rhodamine B (RhB) under visible light, and an enhanced activity is observed. The mechanism of the enhanced activity was further investigated through N2 adsorption-desorption isotherms, UV-vis spectra, photoluminescence spectra, photoelectrochemical measurements, radical trapping experiments and X-ray photoelectron spectroscopy. Furthermore, the photocatalytic performances of obtained g-C3N4/TiO2 under sunlight were also evaluated in aspects of degradation efficiency and stability. The results indicate that the obtained g-C3N4/TiO2 is one promising photocatalyst for practical applications. The study of as-prepared g-C3N4/TiO2 also implies that the present method could be a general route of g-C3N4-coupling photocatalysts.

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Section: Resultscontrasting

confidence: 65%

“…Although the photogenerated holes can not produce ·OH, it is believed the generated holes still can oxidize the pollutant. So, it is generally accepted that the effective species during the photocatalysis reaction of g-C 3 N 4 are holes, and ·O 2 − 6263. According to the result shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

Liu

Chen

et al. 2016

Sci Rep

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“…Recently, graphitic carbon nitride (g-C 3 N 4 ) has been one of the most studied either as a single phase or as part of a photocatalyst because of its notable visible light absorption (Band Gap ~ 2.7 eV) and environmental stability. [5][6][7][8][9][10][11][12][13][14][15][16] Nevertheless, the photocatalytic efficiency of the pure g-C 3 N 4 is limited by the high recombination rate of its photogenerated electron-hole pairs. 6,7,9,17,18 To enhance its photocatalytic properties, many methods or procedures have been essayed.…”

Section: Introductionmentioning

confidence: 99%

Interface Effects in Sunlight-Driven Ag/g-C₃N₄ Composite Catalysts: Study of the Toluene Photodegradation Quantum Efficiency

Fontelles-Carceller

Muñoz‐Batista

Fernández-García

et al. 2016

ACS Appl. Mater. Interfaces

143

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Metallic silver (ranging from 1 to 10 wt %) was deposited onto a graphite-like carbon nitride photocatalyst through a microemultion method. Surface, morphological, and structural properties of the resulting materials were characterized using BET and porosity measurements, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and UV-vis and photoluminescence spectroscopy. The activity of the composite samples under sunlight-type and visible illumination was measured for toluene photodegradation and was analyzed by means of the reaction rate and the quantum efficiency parameter. To obtain the latter observable, the lamp emission properties as well as the radiation field interaction with the catalyst inside the reactor were modeled and numerically calculated. The stability of the samples under both illumination conditions was also studied. The results evidence that the composite samples containing 1-10 silver wt % outperform carbon nitride for sunlight-type and visible illumination, but the optimal use of the charge generated after light absorption is obtained for the sample with 1 wt % of silver acording to the quantum efficiency calculation. The study shows that the optimum silver-g-C3N4 contact is able to outperform TiO2 reference systems (nano-TiO2 and P25) under sunlight illumination and points out that this occurs as a direct consequence of the charge handling through the interface between catalyst components. This indicates that composite systems based on g-C3N4 can be competitive in sunlight-triggered photodegradation processes to eliminate tough polluctants such as toluene, rendering active and stable systems.

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“…XRD pattern of g-C3N4/PUF presented a typical dominant (002) diffraction peak at 27.6 o with an interlayer distance of 0.33 nm (Fig. 2), which has been well known for g-C3N4 [13][14][15]. And a small (100) diffraction peak at 13.1 o with an interlayer distance of 0.68 nm is attributed to the in-plane repeated units [16,17].…”

Section: Resultsmentioning

confidence: 61%

A Novel Metal-Free Visible-Light-Driven Photo catalytic Foam for Efficient Degradation of Methyl Orange

Wu¹,

Gao²,

Li³

2018

Proceedings of the 2nd International Conference on Material Science, Energy and Environmental Engineering (MSEEE 2018)

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Here, graphitic carbon nitride (g-C 3 N 4) was integrated with polyurethane foam (PUF) as a novel metal-free visible-light-driven photocatalytic foam (g-C 3 N 4 /PUF) by a facile ultrasonic method. The fabricated samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray Diffractometry (XRD) and UV-Vis diffuse reflectance spectroscopy (UV-V is DRS). This composite foam exhibited enhanced photocatalytic performance compared to g-C 3 N 4 powders for degradation of methyl orange (MO) in water without stirring under visible light irradiation. The pseudo-first order rate constant (kobs) for MO photodegradation by g-C 3 N 4 /PUF increased by up to a factor of 4.5 when compared with that of g-C3N4. The optimal addition dosage of g-C 3 N 4 precursors for 1 cm 3 PUF was determined to be 0.5 g, namely g-C3N4/PUF-5. The new foam maintained its photocatalytic activity at least five consecutive cycles. Specially, the photocatalytic mechanism of g-C3N4/PUF was revealed, and superoxide radicals (•O 2-) were found to play a more dominant role than hydroxyl radicals (•OH) for organic pollutant degradation.

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Influence of TiO2 morphology on the photocatalytic efficiency of direct Z-scheme g-C3N4/TiO2 photocatalysts for isoniazid degradation

Cited by 328 publications

References 55 publications

A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

Interface Effects in Sunlight-Driven Ag/g-C₃N₄ Composite Catalysts: Study of the Toluene Photodegradation Quantum Efficiency

A Novel Metal-Free Visible-Light-Driven Photo catalytic Foam for Efficient Degradation of Methyl Orange

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Influence of TiO2 morphology on the photocatalytic efficiency of direct Z-scheme g-C3N4/TiO2 photocatalysts for isoniazid degradation

Cited by 328 publications

References 55 publications

A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

Interface Effects in Sunlight-Driven Ag/g-C3N4 Composite Catalysts: Study of the Toluene Photodegradation Quantum Efficiency

A Novel Metal-Free Visible-Light-Driven Photo catalytic Foam for Efficient Degradation of Methyl Orange

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Interface Effects in Sunlight-Driven Ag/g-C₃N₄ Composite Catalysts: Study of the Toluene Photodegradation Quantum Efficiency