Effects of calcining temperature on formation of hierarchical TiO2/g-C3N4 hybrids as an effective Z-scheme heterojunction photocatalyst

Lu, Lianying; Wang, Guohong; Zou, Min; Wang, Juan; Li, Jun

doi:10.1016/j.apsusc.2018.02.080

Cited by 170 publications

(39 citation statements)

References 84 publications

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“…Among numerous n-type photocatalytic semiconductors, g-C 3 N 4 is a promising candidate for its tunable photo-response, and effective charge carrier transportation properties. As a photocatalyst, g-C 3 N 4 has been widely investigated owing to its excellent properties including layered graphite-like structure, visible lightresponsive band gap (∼2.7 eV), facile preparation, low toxicity, and high photostability (Wang et al, 2009(Wang et al, , 2019Ong et al, 2016;Wen J. Q. et al, 2017;Lu et al, 2018;Zhang et al, 2018;Li X. B. et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Novel P-n Li2SnO3/g-C3N4 Heterojunction With Enhanced Visible Light Photocatalytic Efficiency Toward Rhodamine B Degradation

Wang

et al. 2020

Front. Chem.

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The design of highly efficient and stable photocatalysts to utilize solar energy is a significant challenge in photocatalysis. In this work, a series of novel p-n heterojunction photocatalysts, Li 2 SnO 3 /g-C 3 N 4 , was successfully prepared via a facile calcining method, and exhibited superior photocatalytic activity toward the photodegradation of Rhodamine B solution under visible light irradiation as compared with pure Li 2 SnO 3 and g-C 3 N 4. The maximum kinetic rate constant of photocatalytic degradation of Rhodamine B within 60 min was 0.0302 min −1 , and the composites still retained excellent performance after four successive recycles. Chemical reactive species trapping experiments and electron paramagnetic resonance demonstrated that hydroxyl radicals (•OH) and superoxide ions (•O − 2) were the dominant active species in the photocatalytic oxidation of Rhodamine B solution, while holes (h +) only played a minor role. We demonstrated that the enhancement of the photocatalytic activity could be assigned to the formation of a p-n junction photocatalytic system, which benefitted the efficient separation of photogenerated carriers. This study provides a visible light-responsive heterojunction photocatalyst with potential applications in environmental remediation.

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Section: Introductionmentioning

confidence: 99%

Novel P-n Li2SnO3/g-C3N4 Heterojunction With Enhanced Visible Light Photocatalytic Efficiency Toward Rhodamine B Degradation

Wang

et al. 2020

Front. Chem.

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“…Nowadays, several techniques have been reported to combine TiO 2 with g-C 3 N 4 to form composite. The prepared TiO 2 /g-C 3 N 4 composite (g-C 3 N 4 and TiO 2 with a certain ratio) can not only extend the absorption spectrum range of TiO 2 , but also promote the separation efficiency of photogenerated carriers, thus improve the photocatalytic performance [ 27 , 28 ]. For instance, Lu et al obtained the C-TiO 2 /g-C 3 N 4 (CNT) composite by the hydrothermal and calcination methods [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis Heterostructured g-C3N4/TiO2 Composite for Rapid Degradation of Pollutants in Utilizing Visible Light

Liu

Zhang

et al. 2018

Nanomaterials

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To meet the urgent need of society for advanced photocatalytic materials, novel visible light driven heterostructured composite was constructed based on graphitic carbon nitride (g-C3N4) and fibrous TiO2. The g-C3N4/TiO2 (CNT) composite was prepared through electrospinning technology and followed calcination process. The state of the g-C3N4 and fibrous TiO2 was tightly coupled. The photocatalytic performance was measured by degrading the Rhodamine B. Compared to commercial TiO2 (P25®) and electrospun TiO2 nanofibers, the photocatalytic performance of CNT composite was higher than them. The formation of CNT heterostructures and the enlarged specific surface area enhanced the photocatalytic performance, suppressing the recombination rate of photogenerated carriers while broadening the absorption range of light spectrum. Our studies have demonstrated that heterostructured CNT composite with an appropriate proportion can rational use of visible light and can significantly promote the photogenerated charges transferred at the contact interface between g-C3N4 and TiO2.

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“…This finding suggested that the changes in electron cloud density in the carbon atoms, were likely due to the more graphitic structure of LPGC compared with C/LBC. For the O 1s, XPS spectra for all samples are shown in Figures 4D,E. There was a peak at 531.7 eV in BC and LBC, which represented surface OH groups (Lu et al, 2018), but it did not present in C/LBC and LPGC, instead, there was the presence of a peak at 532.5 eV (in both LPGC and C/LBC). This peak can be attributed to the signal of C-O/C=O bonds with a larger contribution from C-O bonds than from C=O bonds.…”

Section: Xps Analysismentioning

confidence: 99%

Synthesis of Porous Biochar Containing Graphitic Carbon Derived From Lignin Content of Forestry Biomass and Its Application for the Removal of Diclofenac Sodium From Aqueous Solution

et al. 2020

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Porous biochar containing graphitic carbon materials have received great attention from various disciplines, especially for environmental pollutant treatment, due to their cost-effective and specific textural properties. This study exhibited a two-step strategy to compose lignin-porous biochar containing graphitic carbon (LPGC) from pitch pine sawdust and investigated its adsorptive removal for diclofenac sodium (DCF) from an aqueous solution. Sulfuric acid (H 2 SO 4 ) was utilized to obtain lignin content from biomass and potassium ferrate (K 2 FeO 4 ) and was adopted to fulfill the synchronous carbonization and graphitization of LPGC. Through slow pyrolysis in atmospheric N 2 (900 • C -2 h), the structure of the as-prepared sample was successfully modified. Using SEM images, a stripped layer structure was observed on the H 2 SO 4 -treated sample for both one-step and two-step activated samples, indicating the pronounced effect of H 2 SO 4 in the layering of materials. K 2 FeO 4 acted as an activator and catalyst to convert biomass into the porous graphitic structure. The BET surface area, XRD and Raman spectra analyses demonstrated that LPGC possessed a micro/mesoporous structure with a relatively large surface area (457.4 m 2 g −1 ) as well as the presence of a graphitic structure. Further adsorption experiments revealed that LPGC exhibited a high DCF adsorption capacity (q max = 159.7 mg g −1 at 298 K, pH = 6.5). The effects of ambient conditions such as contact time, solution pH, temperature, ionic strength, electrolyte background on the uptake of DCF were investigated by a batch adsorption experiment. Results indicated that the experimental data were best fitted with the pseudo second-order model and Langmuir isotherm model. Furthermore, the adsorption of DCF onto the LPGC process was spontaneous and endothermic. Electrostatic interaction, H-bonding interaction, and π-π interaction are the possible adsorption mechanisms. The porous biochar containing graphitic carbon obtained from the lignin content of pitch pine sawdust may be a potential material for eliminating organic pollutants from water bodies.

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Effects of calcining temperature on formation of hierarchical TiO2/g-C3N4 hybrids as an effective Z-scheme heterojunction photocatalyst

Cited by 170 publications

References 84 publications

Novel P-n Li2SnO3/g-C3N4 Heterojunction With Enhanced Visible Light Photocatalytic Efficiency Toward Rhodamine B Degradation

Novel P-n Li2SnO3/g-C3N4 Heterojunction With Enhanced Visible Light Photocatalytic Efficiency Toward Rhodamine B Degradation

One-Step Synthesis Heterostructured g-C3N4/TiO2 Composite for Rapid Degradation of Pollutants in Utilizing Visible Light

Synthesis of Porous Biochar Containing Graphitic Carbon Derived From Lignin Content of Forestry Biomass and Its Application for the Removal of Diclofenac Sodium From Aqueous Solution

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