Sulfur-doped g-C3N4/rGO porous nanosheets for highly efficient photocatalytic degradation of refractory contaminants

Zheng, Yanmei; Liu, Yuanyuan; Guo, Xinli; Chen, Zhongtao; Zhang, Weijie; Wang, Yixuan; Tang, Xuan; Zhang, Yao; Zhao, Yuhong

doi:10.1016/j.jmst.2019.09.018

Cited by 356 publications

(72 citation statements)

References 48 publications

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“…The radius of impedance arc is mainly in direct proportion to the charge-transfer resistance. 28 Compared with pure ZnO, 2.5% Au/ZnO DP-air , and 2.5% Au/ZnO DP-N , 2.5% Au/ZnO DP-H has smaller arc radius, which means that the charge-transfer resistance of this catalyst is lower than that of the other three catalysts. The results show that the photogenerated electron hole transfer and separation efficiency of 2.5% Au/ZnO DP-H is the highest, which is benefited to the separation of photogenerated carriers.…”

Section: ■ Introductionmentioning

confidence: 90%

Visible-Light-Driven Photocatalytic Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid over Plasmonic Au/ZnO Catalyst

Zhu

Zhang

et al. 2022

ACS Sustainable Chem. Eng.

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Photocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is an environmental friendly way to convert platform molecules into high-value chemicals. Here, Au/ZnO catalysts with different oxygen vacancies were fabricated by the deposition precipitation method and were used for the photocatalytic oxidation of HMF to FDCA under visible light irradiation. All of the Au/ZnO catalysts showed excellent photocatalytic oxidation selectivity to FDCA greater than 90% under mild conditions. The Au/ZnODP‑H catalyst treated by H2 afforded the highest HMF conversion and the selectivities of FDCA up to 96.9%. The localized surface plasmon resonance effect of Au nanoparticles, oxygen vacancy, and the existence of the Schottky barrier enhance the separation and transfer efficiency of photogenerated electron–hole pairs of the catalyst, so as to enhance its photocatalytic activity. The active species trapping experiment and electron spin resonance analysis showed that •O2 – and h+ were the active species responsible for the oxidation reaction. The recycle experiment also proved that the catalyst has good stability. This work provides a new strategy for the design of photocatalysts for converting biomass into high-value chemicals.

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Section: ■ Introductionmentioning

confidence: 90%

Visible-Light-Driven Photocatalytic Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid over Plasmonic Au/ZnO Catalyst

Zhu

Zhang

et al. 2022

ACS Sustainable Chem. Eng.

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“…The bulk CN powders were first synthesized by melamine calcination at 550 °C for 2 h in a crucible followed by air cooling to room temperature. According to our previous work, 38 2.55 g of cyanuric acid and 2.5 g of melamine powders were dissolved in 100 and 50 mL of dimethyl sulfoxide (DMSO) solutions under sonication, respectively. Subsequently, the white precipitates were obtained by mixing the above two solutions for 10 min at room temperature.…”

Section: Methodsmentioning

confidence: 99%

S, Na Co-Doped Graphitic Carbon Nitride/Reduced Graphene Oxide Hollow Mesoporous Spheres for Photoelectrochemical Catalysis Application

Zheng

Liu

Guo

et al. 2020

ACS Appl. Nano Mater.

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As an environmentally friendly visible-light-responsive and metal-free photocatalyst, the photoelectrochemical (PEC) performance of graphitic carbon nitride (CN) has still been limited by its large optical band gap, low absorption of light, and inefficient transfer of electron−hole carriers. Herein, we report an S, Na codoped CN/reduced graphene oxide (rGO) (S, Na-CN/rGO) hollow mesoporous sphere (HMS) prepared by supramolecular preorganization of monomers. The as-prepared S, Na-CN/rGO HMS is uniform with a diameter of ∼2 μm and exhibits a high specific surface area up to 92.3 m 2 g −1 , a narrow band gap of 2.26 eV, and a high PEC performance with a photocurrent density of 14.04 μA/cm 2 , which is 78-fold of bulk CN (0.18 μA/cm 2 ). The significantly enhanced PEC performance is attributed to the synergistic effect of enhanced light absorption by the multiple reflections of incident light in the unique HMS structure, the changes of the electronic structure by S, Na co-doping, and the well-conduced rGO layers in CN. The results have provided a way for realizing the practical photoelectrochemical catalysis application of CN.

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“…Fast industry development in the last few decades leads to increased environmental pollution, which has to be solved, whereas renewable sources and environmental problems have attracted a lot of attention by the researchers [ 1 , 2 , 3 , 4 ]. The research on environment-friendly and sustainable energy composite materials will become an important research direction in the future.…”

Section: Introductionmentioning

confidence: 99%

Preparation of CeO2/UiO-66-NH2 Heterojunction and Study on a Photocatalytic Degradation Mechanism

et al. 2022

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CeO2/UiO-66-NH2 (marked as Ce/UN) composites were in-situ synthesized by a hydrothermal method. The properties, photocatalytic aspects, and degradation mechanism of Ce/UN were studied carefully. SEM results show that Ce/UN have a 3D flower-like structure, where octahedral UiO-66-NH2 nanoparticles are embedded in the two-dimensional sheet of CeO2. TEM results demonstrate that CeO2 and UiO-66-NH2 are bonded interfacially to constitute a hetero-junction construction. Data obtained by electrochemical impedance spectroscopy and fluorescence spectroscopy established that Ce/UN has less charge shift resistance and luminescence intensity than these of two pure substances. When the ratio of Ce/UN is 1:1, and the calcination temperature 400 °C is used, the degradation efficiency of RhB in photocatalysis by obtained Ce/UN is about 96%, which is much higher than in the case of CeO2 (4.5%) and UiO-66-NH2 (54%). The improved photocatalytic properties of Ce/UN may be due to the formation of hetero-junction, which is conducive for most photo-carriers and thus the interfacial charge shift efficiency is enhanced. By the free radical capture test, it can be inferred that the major active substances involved in the degradation related to photocatalysis is H+ and · O2−.

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Sulfur-doped g-C3N4/rGO porous nanosheets for highly efficient photocatalytic degradation of refractory contaminants

Cited by 356 publications

References 48 publications

Visible-Light-Driven Photocatalytic Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid over Plasmonic Au/ZnO Catalyst

Visible-Light-Driven Photocatalytic Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid over Plasmonic Au/ZnO Catalyst

S, Na Co-Doped Graphitic Carbon Nitride/Reduced Graphene Oxide Hollow Mesoporous Spheres for Photoelectrochemical Catalysis Application

Preparation of CeO2/UiO-66-NH2 Heterojunction and Study on a Photocatalytic Degradation Mechanism

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