Effective removal of cesium by pristine graphene oxide: performance, characterizations and mechanisms

Kaewmee, Patcharanat; Manyam, Jedsada; Opaprakasit, Pakorn; Le, Giang T.T.; Chanlek, Narong; Sreearunothai, Paiboon

doi:10.1039/c7ra04868h

Cited by 44 publications

(19 citation statements)

References 53 publications

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“… 44 Recent studies demonstrated that the defects in GO sheets are not only always present and often abundant 45 , 46 but also the defects (holes and vacancies) are responsible for some properties important for various applications. 47 − 49 …”

Section: Introductionmentioning

confidence: 99%

Enhanced Sorption of Radionuclides by Defect-Rich Graphene Oxide

Boulanger

Kuzenkova

Iakunkov

et al. 2020

ACS Appl. Mater. Interfaces

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Extremely defect graphene oxide (dGO) is proposed as an advanced sorbent for treatment of radioactive waste and contaminated natural waters. dGO prepared using a modified Hummers oxidation procedure, starting from reduced graphene oxide (rGO) as a precursor, shows significantly higher sorption of U(VI), Am(III), and Eu(III) than standard graphene oxides (GOs). Earlier studies revealed the mechanism of radionuclide sorption related to defects in GO sheets. Therefore, explosive thermal exfoliation of graphite oxide was used to prepare rGO with a large number of defects and holes. Defects and holes are additionally introduced by Hummers oxidation of rGO, thus providing an extremely defect-rich material. Analysis of characterization by XPS, TGA, and FTIR shows that dGO oxygen functionalization is predominantly related to defects, such as flake edges and edge atoms of holes, whereas standard GO exhibits oxygen functional groups mostly on the planar surface. The high abundance of defects in dGO results in a 15-fold increase in sorption capacity of U(VI) compared to that in standard Hummers GO. The improved sorption capacity of dGO is related to abundant carboxylic group attached hole edge atoms of GO flakes as revealed by synchrotron-based extended X-ray absorption fine structure (EXAFS) and high-energy resolution fluorescence detected X-ray absorption near edge structure (HERFD-XANES) spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Enhanced Sorption of Radionuclides by Defect-Rich Graphene Oxide

Boulanger

Kuzenkova

Iakunkov

et al. 2020

ACS Appl. Mater. Interfaces

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“…It can be explained that at pH above 3.9 (pH pzc ), the surface area of GO is partially negatively charged and the electrostatic attractions between cations and GO are stronger because of deprotonation reaction [ 57 ]. It is also caused by the higher availability of active sites on the GO sheets [ 58 ].…”

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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“…It was experimentally demonstrated that the maximum adsorption capacity was approximately 528 mg Cs/g of GO. The sorption ability was tuned by adjusting the pH of the medium [40]. An interesting phenomenon was observed when the experiments were carried out under a broad range of pH.…”

Section: ■ Graphene Oxide (Go)mentioning

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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Effective removal of cesium by pristine graphene oxide: performance, characterizations and mechanisms

Abstract: Cs is effectively removed by graphene oxide (GO). Characterization reveals the Cs capture mechanism by oxygen functional groups and hole defects.

Cited by 44 publications

References 53 publications

Enhanced Sorption of Radionuclides by Defect-Rich Graphene Oxide

Enhanced Sorption of Radionuclides by Defect-Rich Graphene Oxide

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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