Enhanced visible light-driven photocatalytic performance of ZnO–g-C3N4 coupled with graphene oxide as a novel ternary nanocomposite

Jo, Wan-Kuen; Selvam, N. Clament Sagaya

doi:10.1016/j.jhazmat.2015.07.042

Cited by 200 publications

(76 citation statements)

References 55 publications

(97 reference statements)

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“…Figure 7 shows PL spectra of the g-C 3 N 4 , ZnO and CN/ZnO photocatalysts. A main strong emission peak at 498 nm and a shoulder-peak at around 417 nm for pure ZnO were observed, which was consistent with other reports [40,52]. The peak at 463 nm of the bulk g-C 3 N 4 was almost not detected in the CN/ZnO composites due to the low content of CN.…”

Section: Resultssupporting

confidence: 91%

“…The high-resolution N1s spectrum of CN-2/ZnO could be fitted into three different peaks. The main signals at 398.0 and 399.8 eV were assigned to the sp 2 -bonded N atoms in the triazine rings and the bridging N atoms in the N–(C) 3 groups [29,51], while the weak peak associated with terminal amino functions exhibited much higher binding energy at 407.3 eV, probably due to the formation of the Zn–N bonds in the composite material [36,40,49]. …”

Section: Resultsmentioning

confidence: 99%

“…The red-shifted absorption of the composites in the visible-light region was clearly enhanced with the increasing CN amount. These results implied that well-bonded interfaces between the CN nanosheets and ZnO phase could be formed [36,40] and thus make CN/ZnO photocatalysts shift to the lower energy region.…”

Section: Resultsmentioning

confidence: 99%

“…Recent research about the exfoliated g-C 3 N 4 shows that ultrathin g-C 3 N 4 nanosheets (CN) do exhibit many superior properties to its bulk analogy [29,30,31,32,33], very similar to hotspot graphene [34,35]. Although there has been some work recently reported about the g-C 3 N 4 /ZnO composites [16,17,36,37,38,39,40,41], which is mainly focused on the photocatalytic oxidation property, to our knowledge, few reports using CN as the substrate to fabricate nanocatalysts for water purification and coupling ZnO with CN has rarely been reported so far for Cr(VI) photoreduction. In this study, CN/ZnO photocatalysts with different CN loadings were successfully prepared via a simple precipitation-calcination in the presence of exfoliated C 3 N 4 nanosheets.…”

Section: Introductionmentioning

confidence: 99%

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Facile Synthesis of g-C3N4 Nanosheets/ZnO Nanocomposites with Enhanced Photocatalytic Activity in Reduction of Aqueous Chromium(VI) under Visible Light

et al. 2016

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Graphitic-C3N4 nanosheets (CN)/ZnO photocatalysts (CN/ZnO) with different CN loadings were successfully prepared via a simple precipitation-calcination in the presence of exfoliated C3N4 nanosheets. Their morphology and structure were thoroughly characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS) and photoluminescence spectra (PL). The results showed that hexagonal wurzite-phase ZnO nanoparticles were randomly distributed onto the CN nanosheets with a well-bonded interface between the two components in the CN/ZnO composites. The performance of the photocatalytic Cr(VI) reduction indicated that CN/ZnO exhibited better photocatalytic activity than pure ZnO under visible-light irradiation and the photocatalyst composite with a lower loading of CN sheets eventually displayed higher activity. The enhanced performance of CN/ZnO photocatalysts could be ascribed to the increased absorption of the visible light and the effective transfer and separation of the photogenerated charge carriers.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Facile Synthesis of g-C3N4 Nanosheets/ZnO Nanocomposites with Enhanced Photocatalytic Activity in Reduction of Aqueous Chromium(VI) under Visible Light

et al. 2016

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“…However, it can be overcome either by doping or by making a composite with suitable materials. Recently, composite of two materials, namely zinc oxide: reduced graphene oxide (ZnO:rgo), satisfies these requirements for both glucose sensing and photocatalysis [9][10][11][12][13][14][15][16][17][18][19][20]. ZnO is a well-known semiconductor with band gap of 3.37 eV that finds applications in many areas such as opto-electronics and photocatalysis [21,22].…”

Section: Introductionmentioning

confidence: 99%

Morphological tuned preparation of zinc oxide: reduced graphene oxide composites for non-enzymatic fluorescence glucose sensing and enhanced photocatalysis

Sivalingam

Karthikeyan

2016

Appl. Phys. A

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Zinc oxide: reduced graphene oxide (ZnO:rgo) composites with varying ZnO morphologies have been synthesized towards the application of non-enzymatic fluorescence (FL) glucose sensor and photocatalysis for methylene blue (MB) degradation. The phase structure of ZnO has confirmed by X-ray diffraction studies, and the band gap calculations were done by UV absorption spectra. Scanning electron microscope and Raman spectra revealed the morphological change and the vibrational studies of the prepared samples, respectively. The quenching of the FL emission band of ZnO:rgo composite sample confirmed the transfer of electrons from ZnO to rgo which inhibit the exciton recombination process. The non-enzymatic FL glucose sensing was carried out by the addition of dextrose glucose (D-glucose) into the ZnO:rgo composite solution, which shows strong relationship between glucose concentration and the FL intensity. The photocatalytic studies showed that composite with high surface to volume ratio exhibits a maximum degradation of MB over 93 %. Our combined results ensured that the ZnO:rgo composites with varying morphologies could be an effective system for applications such as FL-based glucose sensing and photocatalytic degradation.

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Functional Carbon Nitride Materials in Photo‐Fenton‐Like Catalysis for Environmental Remediation

Lin

Tian

Guan

et al. 2022

Adv Funct Materials

110

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Among various advanced oxidation processes, coupled photocatalysis and heterogeneous Fenton-like catalysis (known as photo-Fenton-like catalysis) to generate highly reactive species for environmental remediation has attracted wide interests. As an emerging metal-free photocatalyst, graphitic carbon nitride (g-C 3 N 4 , CN) has been recently recognized as a promising candidate to catalyze robustly heterogeneous photo-Fenton-like reactions for wastewater remediation. This review summarizes recent progress in fabricating various types of CN-based catalysts for the photo-Fenton-like reaction process. Innovative engineering strategies on the CN matrix are outlined, ranging from morphology control, defect engineering, nonmetal atom doping, organic molecule doping to modification by metal-containing species. The photo-Fenton-like catalytic activities of CN loaded with auxiliary sub-nanoscale (e.g., quantum dots, organometallic molecules, metal cations, and single atom metals) and nanoscale metal-based materials are critically evaluated. Hybridization of CN with bandgap-matching semiconductors for the construction of type-II and Z-scheme heterojunctions are also examined. The critical factors (e.g., morphology, dimensionality, light absorption, charge excitation/migration, catalytic sites, H 2 O 2 generation and activation) that determine the performance of CN-based photocatalysts in Fenton-like catalysis are systematically discussed. After examining the structure-activity relationship, research perspectives are proposed for further development of CN-based photocatalysts toward more efficient photo-Fenton-like reactions and their application in practical water treatment.

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Enhanced visible light-driven photocatalytic performance of ZnO–g-C3N4 coupled with graphene oxide as a novel ternary nanocomposite

Cited by 200 publications

References 55 publications

Facile Synthesis of g-C3N4 Nanosheets/ZnO Nanocomposites with Enhanced Photocatalytic Activity in Reduction of Aqueous Chromium(VI) under Visible Light

Facile Synthesis of g-C3N4 Nanosheets/ZnO Nanocomposites with Enhanced Photocatalytic Activity in Reduction of Aqueous Chromium(VI) under Visible Light

Morphological tuned preparation of zinc oxide: reduced graphene oxide composites for non-enzymatic fluorescence glucose sensing and enhanced photocatalysis

Functional Carbon Nitride Materials in Photo‐Fenton‐Like Catalysis for Environmental Remediation

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