Preparation of core–shell PW<sub>12</sub>@TiO<sub>2</sub> microspheres and oxidative desulfurization performance

Gao, Hongcheng; Wu, Xiaonan; Sun, Dongmei; Niu, Guiling; Guan, Jianyi; Meng, Xiangfu; Chang-zhan, Liu; Xia, Wandong; Song, Xiaojing

doi:10.1039/c9dt00203k

Cited by 37 publications

(9 citation statements)

References 45 publications

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“…95 Identification of oxidation products is of great significance in analyzing the mechanisms involved in desulfurization. 96,97 The model fuel was analyzed using GC−MS before and after desulfurization. According to the mass spectra in Figure 13, DBT was completely converted to its oxidized derivative (DBTO 2 ) with the passage of reaction time (60 min), which in turn facilitates the desulfurization process through the extraction of the highly polar oxidation products.…”

Section: Resultsmentioning

confidence: 99%

Dual Z-Scheme CuO-ZnO@Graphitic Carbon Nitride Ternary Nanocomposite with Improved Visible Light-Induced Catalytic Activity for Ultrasound-Assisted Photocatalytic Desulfurization

et al. 2020

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A CuO-ZnO@graphitic carbon nitride (Cu/Zn/g) triplex heterojunction nanocomposite was prepared through a multistep ultrasound-assisted hydrothermal procedure. XRD, SEM, EIS, EDX, BET, FT-IR, EDS, UV−Vis, TEM, PL, and transient photocurrent techniques were employed for catalyst characterization. The XRD profiles demonstrated the formation of the ZnO wurtzite phase and CuO monoclinic phase in the samples. It was revealed by the SEM and TEM images that the Cu/Zn/g catalyst is composed of g-C 3 N 4 nanosheets decorated with ZnO nanorods and CuO nanospheres. According to the results obtained from the ultrasound-assisted desulfurization experiments, almost complete sulfur removal was achieved using Cu/Zn/g at a photocatalyst dose of 0.2 g/L, initial dibenzothiophene (DBT) concentration of 250 ppm, and H 2 O 2 loading of 250 ppm at 298 K within 60 min of treatment in the presence of ultrasonic waves (80 W/m 2 ) and light irradiation (150 W). Upon g-C 3 N 4 incorporation, considerable enhancement in desulfurization efficiency was achieved due to the significantly higher surface area and lower recombination rate of electron−hole pairs. At optimal experimental conditions, a 99.1% desulfurization rate was achieved using Cu/Zn/g with a g-C 3 N 4 concentration of 10 wt %, compared to the pristine CuO-ZnO catalyst (76.2%). Moreover, the as-synthesized photocatalyst showed excellent stability after five cycles. Kinetic studies also confirmed that the desulfurization procedure could be fitted to a pseudo-firstorder kinetic model. Finally, the product of DBT oxidation was identified by the gas chromatography−mass spectrometry analysis. It was revealed on the basis of the photoelectrochemical and trapping experiments that the photoinduced holes and •OH radicals are responsible for desulfurization and the charge carrier migration pattern is dictated by the dual Z-scheme approach, resulting in the enhanced redox potential of the as-synthesized catalyst and therefore outstanding photocatalytic performance. ■ HIGHLIGHTS• Cu/Zn/g ternary composite was prepared and used for sono-photocatalytic desulfurization. • Complete desulfurization was achieved using a combined approach of the dual Z-scheme Cu/Zn/g photocatalyst, US, and visible light irradiation within 60 min. • The fabricated catalyst showed excellent catalytic performance and stability after five cycles. • Photogenerated charge carriers and •OH radicals are responsible for the oxidative treatment.

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Section: Resultsmentioning

confidence: 99%

Dual Z-Scheme CuO-ZnO@Graphitic Carbon Nitride Ternary Nanocomposite with Improved Visible Light-Induced Catalytic Activity for Ultrasound-Assisted Photocatalytic Desulfurization

et al. 2020

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“…[30,31] However, the XRD spectra of POM@ZnCoS NWs show characteristic peaks of Zn 0.76 Co 0.24 S at 2θ values of 28.7°, 33.2°, 59.2°, 69.7°, and 76.9° attributed to the (111), ( 200), (222) (400), and (331) plane of Zn 0.76 Co 0.24 S, and other diffraction peaks at 2θ values 19.7°, 62.4°, and 64.5°, attributed to the different faces of PW 12 nanospheres. [32,33] suggesting the formation of highly crystalline nanohybrid of ZnCoS NWs and PW 12 nanoparticles (Figure 2a). Additionally, the characteristics peaks of Ni foam are also detected in the XRD spectra of ZnCoS NWs and POM@ZnCoS NWs hybrid, suggesting the homogeneous growth of the hybrid in the 3D nickel foam.…”

Section: Structural and Morphological Characterizations Of Pom@zncos Nwsmentioning

confidence: 99%

Fabrication of Polyoxometalate Anchored Zinc Cobalt Sulfide Nanowires as a Remarkable Bifunctional Electrocatalyst for Overall Water Splitting

Gautam

Liu

et al. 2021

Adv Funct Materials

128

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The advancement of a naturally rich and effective bifunctional substance for hydrogen and oxygen evolution reaction is crucial to enhance hydrogen fuel production efficiency via the electrolysis process. Herein, facile and scalable hydrothermal synthesis of bifunctional electrocatalyst of polyoxometalate anchored zinc cobalt sulfide nanowire on Ni-foam (NF) for overall water splitting is reported for the first time. The electrochemical analysis of POM@ZnCoS/NF displays significantly low HER and OER overpotentials of 170/337 and 200/300 mV to attain a current density of 10/40 and 20/50 mA cm −2 , respectively, demonstrating the notable performance of POM@ZnCoS/NF toward H 2 and O 2 evolution reaction in alkaline medium. Additionally, the electrolyzer consisting of the POM@ZnCoS/NF anode and cathode shows an appealing potential of 1.56 V to deliver 10 mA cm −2 current density for overall water splitting. The high electrocatalytic activity of the POM@ZnCoS/NF is attributed to modulation of the electronic and chemical properties, increment of the electroactive sites and electrochemically active surface area of the zinc cobalt sulfide nanowires due to the anchorage of polyoxometalate nanoparticles. These results demonstrate the advantage of the polyoxometalate incorporation strategy for the design of cost-effective and highly competent bifunctional catalysts for complete water splitting.

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“…[58] The binding energy located at 35.3 and 37.35 eV in Figure 3d are assigned to W 4f 7/2 and W 4f 5/2 ; this result implies the PW 12 existed in ZnTiÀ PW-500 through chemical bonds. [59]…”

Section: Characterization Of the Samplementioning

confidence: 99%

Calcined ZnTi‐Layered Double Hydroxide Intercalated with H₃PW₁₂O₄₀ with Efficiently Photocatalytic and Adsorption Performances

Zou

Shi

Zhang

et al. 2021

Chemistry A European J

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Wastewater treatment is of great significance to environmental remediation. The exploration of efficient and stable methods for wastewater treatment is still a challenging issue. Herein, a heterojunction material with photocatalysis and adsorption properties has been designed to remove the complex pollutants from wastewater. The heterojunction material (ZnO/TiO 2 À PW 12 , PW 12 = [PW 12 O 40 ] 3À ) was synthesized by calcining the ZnTiÀ layered double hydroxide (ZnTi-LDH) intercalated with the Keggin-type polyoxometalate H 3 PW 12 O 40 . In the construction of ZnO/TiO 2 À PW 12 it was found that the polyanionic PW 12 remained unchanged in the process of forming the proposed heterojunction. The photochemical properties verify that heterojunction synergistic with PW 12 facilitated the separation of photoproduced electron-hole pairs and thus suppressed the recombination. Therefore, ZnO/TiO 2 À PW 12 exhibits excellent photocatalytic property, and the efficiency of Cr(VI) photoreduction reached more than 90 % in the first 3 min. Furthermore, the electrostatic force between the PW 12 and cationic dyes makes ZnO/ TiO 2 À PW 12 having an outstanding adsorption performance for cationic dyes, such as rhodamine B, crystal violet and methyl blue. Such heterojunction material combined with polyoxometalate puts forward new insights for the design of functional materials for water treatment with low cost and high efficiency.

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Preparation of core–shell PW₁₂@TiO₂ microspheres and oxidative desulfurization performance

Abstract: Polyoxometalate-based heterogeneous catalyst with core–shell structure.

Cited by 37 publications

References 45 publications

Dual Z-Scheme CuO-ZnO@Graphitic Carbon Nitride Ternary Nanocomposite with Improved Visible Light-Induced Catalytic Activity for Ultrasound-Assisted Photocatalytic Desulfurization

Dual Z-Scheme CuO-ZnO@Graphitic Carbon Nitride Ternary Nanocomposite with Improved Visible Light-Induced Catalytic Activity for Ultrasound-Assisted Photocatalytic Desulfurization

Fabrication of Polyoxometalate Anchored Zinc Cobalt Sulfide Nanowires as a Remarkable Bifunctional Electrocatalyst for Overall Water Splitting

Calcined ZnTi‐Layered Double Hydroxide Intercalated with H₃PW₁₂O₄₀ with Efficiently Photocatalytic and Adsorption Performances

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Preparation of core–shell PW12@TiO2 microspheres and oxidative desulfurization performance

Abstract: Polyoxometalate-based heterogeneous catalyst with core–shell structure.

Cited by 37 publications

References 45 publications

Dual Z-Scheme CuO-ZnO@Graphitic Carbon Nitride Ternary Nanocomposite with Improved Visible Light-Induced Catalytic Activity for Ultrasound-Assisted Photocatalytic Desulfurization

Dual Z-Scheme CuO-ZnO@Graphitic Carbon Nitride Ternary Nanocomposite with Improved Visible Light-Induced Catalytic Activity for Ultrasound-Assisted Photocatalytic Desulfurization

Fabrication of Polyoxometalate Anchored Zinc Cobalt Sulfide Nanowires as a Remarkable Bifunctional Electrocatalyst for Overall Water Splitting

Calcined ZnTi‐Layered Double Hydroxide Intercalated with H3PW12O40 with Efficiently Photocatalytic and Adsorption Performances

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Preparation of core–shell PW₁₂@TiO₂ microspheres and oxidative desulfurization performance

Calcined ZnTi‐Layered Double Hydroxide Intercalated with H₃PW₁₂O₄₀ with Efficiently Photocatalytic and Adsorption Performances