g-C3N4/Nb2O5 heterostructures tailored by sonochemical synthesis: Enhanced photocatalytic performance in oxidation of emerging pollutants driven by visible radiation

Silva, Gelson T.S.T. da; Carvalho, Kele T. G.; Lopes, Osmando F.; Ribeiro, Cauê

doi:10.1016/j.apcatb.2017.05.038

Cited by 124 publications

(52 citation statements)

References 47 publications

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“…However, the use of 5.0 g of melamine resulted in the formation of another phase that was identified as graphitic carbon nitride (g‐C 3 N 4 ) (JCPDS card no. 87‐1526), which was the predominant phase in this sample.…”

Section: Resultsmentioning

confidence: 82%

“…The inappropriate disposal of hazardous industrial wastes such as pesticides, dyes, and pharmaceuticals in water resources causes serious effects in entire ecosystems, with significant impacts on the environment and to the health of living beings . There are increasing efforts to develop suitable processes for the elimination or reduction of such contaminants . Oxide semiconductors including zinc oxide (ZnO) have been successfully used in photocatalytic processes for the degradation of environmental pollutants .…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of ZnO Nanoparticles Assisted by N Sources and their Application in the Photodegradation of Organic Contaminants

Silva

Carvalho²,

Lopes

et al. 2017

ChemCatChem

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A modified polymeric precursor method assisted by N sources (urea or melamine) was used to obtain anion‐doped ZnO nanoparticles. The influence of these molecules on the physical‐chemical and photocatalytic properties of the as‐synthesized samples was investigated. The ZnO nanoparticles exhibited a hexagonal wurtzite phase and crystallite sizes of approximately 20 nm. The addition of urea or melamine to the Zn2+ precursor solution improved the surface properties of the materials and resulted in controlled growth of the N‐doped ZnO nanoparticles, with urea showing superior performance for this purpose. These changes led to improved photocatalytic performance in the degradation of methylene blue (MB) dye and ethionamide antibiotic under UVC irradiation. It was observed that the indirect mechanism involving .OH radical attack played the main role in both photodegradation reactions catalyzed by the as‐synthesized ZnO samples, whereas the photosensitization mechanism had a negligible influence. The use of ESI‐MS analyses showed that the MB dye molecules were broken up by the action of the ZnO photocatalyst, indicating the occurrence of a mineralization process.

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Section: Resultsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO Nanoparticles Assisted by N Sources and their Application in the Photodegradation of Organic Contaminants

Silva

Carvalho²,

Lopes

et al. 2017

ChemCatChem

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“…Organic pollutants like phenol and other benzene derived synthetic dyes have proved to be highly carcinogenic and need to be degraded completely before these are released in the environment. Owing to their high stability, a wide range of methods like adsorption, photocatalytic degradation, precipitation techniques have been developed for removal of these dyes . Advanced Oxidation Processes (AOPs) are efficient methods which can be used for dye degradation involving UV/O 3 , UV/Fenton's reagent or UV/H 2 O 2 by producing hydroxyl radical (OH . )…”

Section: Introductionmentioning

confidence: 99%

Sodium and Sulfur Co‐Doped Graphitic Carbon Nitride: A Novel and Effective Visible Light Driven Photocatalyst with Tunable Bandgap for Degradation of Eosin Yellow

et al. 2020

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A novel Na and S co-doped g-C 3 N 4 (NaÀ SÀ GCN) hybrid was synthesized by facile and inexpensive calcination of melamine and Na 2 S. The synthesized catalysts were systematically characterized with XRD, FT-IR, SEM, HR-TEM, XPS, PL and UV-DRS. The successful doping of Na and S in the g-C 3 N 4 layers was confirmed with XPS and FT-IR analysis. UV-DRS spectra and band gap calculation revealed higher visible light absorption and lower band gap of NaÀ SÀ GCN (2.64 eV) than that of GCN (2.83 eV). The photochemical efficiency of NaÀ SÀ GCN was examined using eosin yellow (EY) which afforded 90 % degradation in 140 minutes under visible light. A 7.4 times higher degradation of EY was found with NaÀ SÀ GCN than that with bulk GCN. The higher catalytic activity was attributed to enhanced visible light absorption and effective lowering of recombination of reactive photogenerated species. The involvement of * OH and O 2 * À in the degradation process was confirmed with radical trapping experiments.

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“…Among the studied various narrow band gap semiconductor materials, the g-C 3 N 4 with an indirect band gap of 2.7 eV has attracted extensive attention due to its thermal stability, physicochemical stability, excellent photoelectric transmission property, non-toxic and harmless characteristics [ 20 , 21 , 22 ]. In addition, semiconductor g-C 3 N 4 was easily available and can be obtained by direct thermal decomposition of precursor materials, for instance, urea, melamine, cyanamide and dicyandiamide [ 23 , 24 , 25 , 26 ]. Nowadays, several techniques have been reported to combine TiO 2 with g-C 3 N 4 to form composite.…”

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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g-C3N4/Nb2O5 heterostructures tailored by sonochemical synthesis: Enhanced photocatalytic performance in oxidation of emerging pollutants driven by visible radiation

Cited by 124 publications

References 47 publications

Synthesis of ZnO Nanoparticles Assisted by N Sources and their Application in the Photodegradation of Organic Contaminants

Synthesis of ZnO Nanoparticles Assisted by N Sources and their Application in the Photodegradation of Organic Contaminants

Sodium and Sulfur Co‐Doped Graphitic Carbon Nitride: A Novel and Effective Visible Light Driven Photocatalyst with Tunable Bandgap for Degradation of Eosin Yellow

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

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