Preparation, characterization and photocatalytic activity of Dawson type phosphotungstate/graphene oxide composites

Wang, Ruixin; Dang, Lifang; Liu, Yefeng; Jiao, Weizhou

doi:10.1016/j.apt.2019.04.020

Cited by 16 publications

(9 citation statements)

References 36 publications

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“…Epoxy-modified P 2 W 17 (EPO-P 2 W 17 ) was prepared as described previously. 36 1 g of NH 2 -3D GO or NH 2 -2D GO was dispersed into 100 mL of DMF, and 0.60 g of solid NaOH was added and heated to 333 K under a N 2 atmosphere. Then, 25 mL of DMF solution containing 2 g of EPO-P 2 W 17 was added, reacted at 333 K for 12 h, cooled, and centrifuged to separate the solid product.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Three-Dimensional Graphene Oxide Covalently Functionalized with Dawson-Type Polyoxotungstates for Oxidative Desulfurization of Model Fuels

Liu

Wang

et al. 2020

Ind. Eng. Chem. Res.

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Graphene oxide (GO) with three-dimensional network structure (3D GO) was used as a support, and the monovacant Dawson polyoxotungstate K10[α-P2W17O61]·20H2O (P2W17) modified with silane coupling agent was covalently immobilized on 3D GO to prepare a novel heterogeneous catalyst P2W17/3D GO. Characterizations of the supported catalyst by FT-IR, UV–vis, XPS, SEM, and TEM confirmed that P2W17 was immobilized on 3D GO successfully and well dispersed. The as-prepared catalyst P2W17/3D GO exhibited high catalytic performance in the oxidative desulfurization (ODS) system of model fuels containing dibenzothiophene (DBT) or tetrahydrothiophene (THT) using H2O2 as the oxidant. 3D GO exhibits a certain carrier effect due to its three-dimensional network structure, the strong adsorption of thiophene compounds through π–π and S−π interactions, and the acid–base interactions with 3D GO, which make the ODS performance of P2W17/3D GO much higher than that of P2W17/2D GO as well as the homogeneous catalyst EPO-P2W17. Various reaction conditions were investigated, and complete oxidative removal of DBT (500 ppm) and THT (5000 ppm) was achieved at 120 and 30 min under the optimum conditions, respectively. Kinetics studies were conducted to better understand the oxidation reactions, and the catalytic oxidation of DBT and THT can both be well described by the pseudo-first-order model. Moreover, the supported catalyst P2W17/3D GO showed excellent durability even after 5 times recycling due to covalent immobilization, which makes it a promising prospect for industrial application.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Three-Dimensional Graphene Oxide Covalently Functionalized with Dawson-Type Polyoxotungstates for Oxidative Desulfurization of Model Fuels

Liu

Wang

et al. 2020

Ind. Eng. Chem. Res.

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“…It could be assumed that there is an electron transfer from POM species to GO [ 80 , 81 ]. Another researcher also confirmed that the surface area of the GO-POM composite was improved five times due to the covalent bond between the POM species and GO [ 38 ]. In general, the enhancement of adsorption capacity is in line with the increase of sp 2 /sp 3 carbon clusters on each composite surface.…”

Section: Resultsmentioning

confidence: 92%

“…Tungsten is dominantly originated from the α-K 6 P 2 W 18 O 62 particle, and carbon is coming from the GO. The result suggests that the tungsten, oxygen, and carbon elements were homogeneously distributed in the GO-POM nanocomposite, showing the successful combination between GO and POM [ 38 ]. This phenomenon was also confirmed by TEM measurement.…”

Section: Resultsmentioning

confidence: 99%

Exploration of the Cs Trapping Phenomenon by Combining Graphene Oxide with α-K6P2W18O62 as Nanocomposite

et al. 2021

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A graphene oxide-based α-K6P2W18O62 (Dawson-type polyoxometalate) nanocomposite was formed by using two types of graphene oxide (GO) samples with different C/O compositions. Herein, based on the interaction of GO, polyoxometalates (POMs), and their nanocomposites with the Cs cation, quantitative data have been provided to explicate the morphology and Cs adsorption character. The morphology of the GO-POM nanocomposites was characterized by using TEM and SEM imaging. These results show that the POM particle successfully interacted above the surface of GO. The imaging also captured many small black spots on the surface of the nanocomposite after Cs adsorption. Furthermore, ICP-AES, the PXRD pattern, IR spectra, and Raman spectra all emphasized that the Cs adsorption occurred. The adsorption occurred by an aggregation process. Furthermore, the difference in the C/O ratio in each GO sample indicated that the ratio has significantly influenced the character of the GO-POM nanocomposite for the Cs adsorption. It was shown that the oxidized zone (sp2/sp3 hybrid carbon) of each nanocomposite sample was enlarged by forming the nanocomposite compared to the corresponding original GO sample. The Cs adsorption performance was also influenced after forming a composite. The present study also exhibited the fact that the sharp and intense diffractions in the PXRD were significantly reduced after the Cs adsorption. The result highlights that the interlayer distance was changed after Cs adsorption in all nanocomposite samples. This has a good correlation with the Raman spectra in which the second-order peaks changed after Cs adsorption.

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“…Fabrication of the composites exploiting the concept of covalent bonding addressed the problem of POM detachment from the carriers. The report revealed that the surface area of the GO/POM composite was five times larger than that of the POM-only [56]. Lu et al reported strong interlayer interactions could be produced by POMs (on the GO sheets) when epoxy groups are substituted by ethylenediamine groups (EN, weak reductant).…”

Section: ■ Anchoring Polyoxometalate (Pom) On the Surface Of Graphene Oxidementioning

confidence: 99%

Potentiality of Graphene Oxide and Polyoxometalate as Radionuclides Adsorbent to Restore the Environment after Fukushima Disaster: A Mini Review

et al. 2021

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This paper discusses the promising candidate of excellent materials, graphene oxide (GO) and polyoxometalates (POMs), for radionuclide adsorbent. In this perspective, the unique properties of GO and POMs make them ideal candidates for developing new composites having the ability to adsorb radionuclides, and several essential things are reviewed. First, the anchoring mechanism to deposit POM on the GO surface area by (i) carboxylation method, (ii) covalent bonding, and (iii) impregnation method. Second, the radionuclides removal mechanism is described in several systems: (i) coagulation, (ii) electrostatic interaction, (iii) ion trapping, and (iv) H+-exchange. Third, the experimental condition that employed to enlarge the sorption capacity such as (i) pH adjustment, (ii) employing multiple oxidations, and (iii) cation charge. A thorough understanding of the POM-anchored GO material can pave the way for future research on similar materials. It can also help in understanding the nature of the interactive collaboration present between GO and POM.

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Preparation, characterization and photocatalytic activity of Dawson type phosphotungstate/graphene oxide composites

Cited by 16 publications

References 36 publications

Three-Dimensional Graphene Oxide Covalently Functionalized with Dawson-Type Polyoxotungstates for Oxidative Desulfurization of Model Fuels

Three-Dimensional Graphene Oxide Covalently Functionalized with Dawson-Type Polyoxotungstates for Oxidative Desulfurization of Model Fuels

Exploration of the Cs Trapping Phenomenon by Combining Graphene Oxide with α-K6P2W18O62 as Nanocomposite

Potentiality of Graphene Oxide and Polyoxometalate as Radionuclides Adsorbent to Restore the Environment after Fukushima Disaster: A Mini Review

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