Plasmonic ZnO/Au/g-C3N4 nanocomposites as solar light active photocatalysts for degradation of organic contaminants in wastewater

Lee, Seung Jun; Begildayeva, Talshyn; Jung, Hyeon Jin; Koutavarapu, Ravindranadh; Yu, Yiseul; Choi, Moonhee; Choi, Myong Yong

doi:10.1016/j.chemosphere.2020.128262

Cited by 83 publications

(26 citation statements)

References 55 publications

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“…The materials prepared by the PLAL technique in this work were semiconductors (SCs). Hence, they possessed characteristic electronic properties, including energies of conduction bands (CBs) and valence bands (VBs), bandgaps, and charge carriers 73 . The values of these key parameters determine the electrochemical properties of the material.…”

Section: Resultsmentioning

confidence: 99%

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Multifunctional photo‐electrocatalysts of copper sulfides prepared via pulsed laser ablation in liquid: Phase formation kinetics and photo‐electrocatalytic activity

Begildayeva

Chinnadurai

Lee

et al. 2022

Intl J of Energy Research

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Summary Designing a highly efficient and less expensive electrocatalyst for electrolyzers and fuel cells is of great importance to creating a sustainable future energy source. Herein, we applied a unique and extremely facile pulsed laser ablation in the liquid synthesis route for the fabrication of phase‐engineered CuxSy nanospheres. The multifunctionality of these catalysts was assessed by examining the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and methanol oxidation reaction (MOR). As a result, low overpotentials of 390 mV (HER) and 440 mV (OER) were achieved for sulfur‐rich and copper‐rich samples in alkaline media, respectively. Furthermore, the high selectivity of Cu over methanol and the high number of electrochemically accessible active sites equal to 7.9 × 1016 promoted the MOR with a current density of 28.3 mA/cm2 at the vertex potential. It is worth emphasizing that in this research, we consider the electrocatalyst's initial electrocatalytic water decomposition function to gain a better understanding of the photoelectrocatalytic behavior. Using a beneficial photo‐assisted electrochemical method, a high OER catalytic activity was obtained under light irradiation due to the large light absorption coefficients of the synthesized electrocatalysts, which facilitated electron transfer at the electrode‐electrolyte interface.

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Section: Resultsmentioning

confidence: 99%

“…Hence, they possessed characteristic electronic properties, including energies of conduction bands (CBs) and valence bands (VBs), bandgaps, and charge carriers. 73 The values of these key parameters determine the electrochemical properties of the material. Generally, SC can be identified based on its bandgap value.…”

Section: Photoelectrochemical Oer Her and Mormentioning

confidence: 99%

Multifunctional photo‐electrocatalysts of copper sulfides prepared via pulsed laser ablation in liquid: Phase formation kinetics and photo‐electrocatalytic activity

Begildayeva

Chinnadurai

Lee

et al. 2022

Intl J of Energy Research

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“…Different g-C 3 N 4 -ZnO heterojunction-based ternary composites have been constructed by various researchers worldwide [183][184][185][186][187]. The surface plasmon resonance (SPR) effect of Ag and Au nanoparticles (NPs), resulting in the improved photocatalytic activities improve by increasing the electron-hole generation and separation, so many researchers tend to use Ag NPs in the heterojunction structures [188][189][190][191][192]. Ag NPs facilitate the migration and improve the photoinduced electron-hole pairs separation by creating close interfaces between g-C 3 N 4 and ZnO.…”

Section: Zno-g-c 3 Nmentioning

confidence: 99%

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

2022

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g-C3N4 has drawn lots of attention due to its photocatalytic activity, low-cost and facile synthesis, and interesting layered structure. However, to improve some of the properties of g-C3N4, such as photochemical stability, electrical band structure, and to decrease charge recombination rate, and towards effective light-harvesting, g-C3N4–metal oxide-based heterojunctions have been introduced. In this review, we initially discussed the preparation, modification, and physical properties of the g-C3N4 and then, we discussed the combination of g-C3N4 with various metal oxides such as TiO2, ZnO, FeO, Fe2O3, Fe3O4, WO3, SnO, SnO2, etc. We summarized some of their characteristic properties of these heterojunctions, their optical features, photocatalytic performance, and electrical band edge positions. This review covers recent advances, including applications in water splitting, CO2 reduction, and photodegradation of organic pollutants, sensors, bacterial disinfection, and supercapacitors. We show that metal oxides can improve the efficiency of the bare g-C3N4 to make the composites suitable for a wide range of applications. Finally, this review provides some perspectives, limitations, and challenges in investigation of g-C3N4–metal-oxide-based heterojunctions.

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“…The XRD spectra of different catalysts are presented in Figure 3. The peaks at 13.2° and 27.3° in pure g-C3N4 were respectively attributed to the in-plane repeating units of the continuous heptazine framework ((100) crystal plane) and the interlayer stacking of the periodic conjugated aromatic structure ((002) crystal plane) [42][43][44]. The diffraction peaks of M/g-C3N4 at 42.74° and 62.18° corresponded to the (200) and (220) crystal planes of MgO, respectively.…”

Section: Xrdmentioning

confidence: 99%

Enhanced Degradation of Rhodamine B through Peroxymonosulfate Activated by a Metal Oxide/Carbon Nitride Composite

Wang

Zhang

et al. 2022

Water

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The development of high catalytic performance heterogeneous catalysts such as peroxymonosulfate (PMS) activators is important for the practical remediation of organic pollution caused by Rhodamine B (RhB). An economical and facile synthesized composite of copper–magnesium oxide and carbon nitride (CM/g-C3N4) was prepared by the sol-gel/high-temperature pyrolysis method to activate PMS for RhB degradation. CM/g-C3N4 exhibited a splendid structure for PMS activation, and the aggregation of copper–magnesium oxide was decreased when it was combined with carbon nitride. The introduction of magnesium oxide and carbon nitride increased the specific surface area and pore volume of CM/g-C3N4, providing more reaction sites. The low usage of CM/g-C3N4 (0.3 g/L) and PMS (1.0 mM) could rapidly degrade 99.88% of 10 mg/L RhB, and the RhB removal efficiency maintained 99.30% after five cycles, showing the superior catalytic performance and reusability of CM/g-C3N4. The synergistic effect of copper and g-C3N4 improved the PMS activation. According to the analyses of EPR and quenching experiments, SO4•−, •OH and O2•− radicals and 1O2 were generated in the activation of PMS, of which SO4•− and 1O2 were important for RhB removal. The toxicity of RhB was alleviated after being degraded by the CM/g-C3N4/PMS system. This study provides an efficient and promising strategy for removing dyes in water due to the hybrid reaction pathways in the CM/g-C3N4/PMS system.

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Plasmonic ZnO/Au/g-C3N4 nanocomposites as solar light active photocatalysts for degradation of organic contaminants in wastewater

Cited by 83 publications

References 55 publications

Multifunctional photo‐electrocatalysts of copper sulfides prepared via pulsed laser ablation in liquid: Phase formation kinetics and photo‐electrocatalytic activity

Multifunctional photo‐electrocatalysts of copper sulfides prepared via pulsed laser ablation in liquid: Phase formation kinetics and photo‐electrocatalytic activity

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

Enhanced Degradation of Rhodamine B through Peroxymonosulfate Activated by a Metal Oxide/Carbon Nitride Composite

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