Graphene-supported ordered mesoporous composites used for environmental remediation: A review

Wu, Xianliang; Hu, Jiwei; Qi, Jimei; Hou, Yu; Wei, Xionghui

doi:10.1016/j.seppur.2020.116511

Cited by 39 publications

(17 citation statements)

References 134 publications

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“…Zhang et al [64] used Cs-corrected STEM to study the synthesis of nitrogen-doped graphene-based Fe single-atom catalysts (Fe/NG) and found that nitrogen-doped graphene has Fe single-atom groups confined by nitrogen atoms. The valence state, stereochemistry and electronic configuration of the central atom can be obtained by X-ray absorption near-edge structure spectroscopy (XANES) [65]. Schlebrowski et al [66] reported that near-edge X-ray absorption fine structure (NEXAFS) was used to determine the binding state of surface carbon atoms.…”

Section: Characterization Of Graphene-based Nanocompositesmentioning

confidence: 99%

Advances in the Applications of Graphene-Based Nanocomposites in Clean Energy Materials

Xiang

Xin

et al. 2021

Crystals

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Extensive use of fossil fuels can lead to energy depletion and serious environmental pollution. Therefore, it is necessary to solve these problems by developing clean energy. Graphene materials own the advantages of high electrocatalytic activity, high conductivity, excellent mechanical strength, strong flexibility, large specific surface area and light weight, thus giving the potential to store electric charge, ions or hydrogen. Graphene-based nanocomposites have become new research hotspots in the field of energy storage and conversion, such as in fuel cells, lithium-ion batteries, solar cells and thermoelectric conversion. Graphene as a catalyst carrier of hydrogen fuel cells has been further modified to obtain higher and more uniform metal dispersion, hence improving the electrocatalyst activity. Moreover, it can complement the network of electroactive materials to buffer the change of electrode volume and prevent the breakage and aggregation of electrode materials, and graphene oxide is also used as a cheap and sustainable proton exchange membrane. In lithium-ion batteries, substituting heteroatoms for carbon atoms in graphene composite electrodes can produce defects on the graphitized surface which have a good reversible specific capacity and increased energy and power densities. In solar cells, the performance of the interface and junction is enhanced by using a few layers of graphene-based composites and more electron-hole pairs are collected; therefore, the conversion efficiency is increased. Graphene has a high Seebeck coefficient, and therefore, it is a potential thermoelectric material. In this paper, we review the latest progress in the synthesis, characterization, evaluation and properties of graphene-based composites and their practical applications in fuel cells, lithium-ion batteries, solar cells and thermoelectric conversion.

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Section: Characterization Of Graphene-based Nanocompositesmentioning

confidence: 99%

Advances in the Applications of Graphene-Based Nanocomposites in Clean Energy Materials

Xiang

Xin

et al. 2021

Crystals

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“…This fact can be explained by the good adsorption properties of GO towards metal ions. 1,61 Covalent immobilization of GOQDs on the silica surface was performed via an earlier-established procedure for the covalent attachment of carboxyl-containing organic compounds on SiO 2 -NH 2 , by the acylation of immobilised aminosilane in anhydrous solvent (DMF) in the presence of DCC. 10,14 An excess of GOQDs was separated from the nal product by multiple decantations of the precipitate alternating with ultrasonic treatment of SiO 2 -GOQDs in DMF.…”

Section: Synthesis Approachmentioning

confidence: 99%

“…Graphene oxide (GO) is one of the most commonly used carbon modiers for the preparation of various hybrid materials. 1,2 Graphene oxide belongs to the class of 2D-nano objects (nanosheets) of up to several nanometres thickness with a lateral size >10 4 nm. A macromolecule of GO has a huge surface area (up to 2630 m 2 g À1 ) 3 and contains a basal plane of graphene with many oxygen-containing defects.…”

Section: Introductionmentioning

confidence: 99%

“…14 Unfortunately, in many recent publications, this effect was ignored and, hence, hybrid SiO 2 @GO materials have not shown their full potential. 1,[15][16][17] To achieve synergy between the high surface area and polyfunctional nature of GO on the one hand, and the rigid structure of a porous support, on the other hand, the lateral size of GO must be considerably decreased. A lot of progress has been achieved in this direction, in order to tune the properties of GO by downsizing its particles to the several nanometre scale.…”

Section: Introductionmentioning

confidence: 99%

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Graphene oxide quantum dots immobilized on mesoporous silica: preparation, characterization and electroanalytical application

et al. 2020

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“…Heavy metals harm human health when excessive levels of heavy metals accumulate in animals and plants through the food chain due to their inability to biodegrade in the environment [4]. Heavy metal pollution in soil mainly comes from industrial activities, traffic, and domestic waste pollution [5]. However, unpolluted soil is essential for ensuring the safety of edible crops.…”

Section: Introductionmentioning

confidence: 99%

Health Risk Assessment of Heavy Metals in Soils before Rice Sowing and at Harvesting in Southern Jiangsu Province, China

Cheng

Xie

Chen

et al. 2020

Journal of Chemistry

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Rice, one of the most important staple crops in China, is easily contaminated by heavy metal pollution from industrial development. In this work, we systematically investigated the heavy metal (Cr, Cd, Pb, Zn, and Cu) and metalloid (Hg and As) concentrations in paddy soils and different rice tissues in southern Jiangsu Province, China. The potential ecological hazard index method and in vitro simulation test were used to evaluate the influence of heavy metals on local resident health. The results showed that, before rice sowing and at the harvesting period, the order of Eri values was EriCd>EriHg>EriAs>EriPb>EriCu>EriCr>EriZn. The low-risk index values (91.63 and 30.29) for the heavy metals indicated the low risk at the two stages in the study area based on the potential ecological hazard index. As determined with Tessier’s five-stage sequential extraction procedure, the proportions of the chemical speciation of the heavy metals were as follows: residual > organic matter-bound > iron-manganese oxide-bound > carbonate-bound > exchangeable. The order of the values of the accumulation and transfer factors was Cd (3.16) > Cu (0.42) > Zn (0.28) > Pb (0.25) > As (0.07) > Cr (0.04) > Cr (0.03) and root > stem > leaves, respectively. In vitro simulation tests showed that, in both adults and children, the daily amount of Pb and Cd intake through the soil-oral cavity route in the study area did not exceed the daily tolerance for Pb and Cd proposed by the WHO. In summary, although there is no obvious danger to local adults and children, it is necessary to be aware of the possibility of rice contamination from Cd in the soil.

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Graphene-supported ordered mesoporous composites used for environmental remediation: A review

Cited by 39 publications

References 134 publications

Advances in the Applications of Graphene-Based Nanocomposites in Clean Energy Materials

Advances in the Applications of Graphene-Based Nanocomposites in Clean Energy Materials

Graphene oxide quantum dots immobilized on mesoporous silica: preparation, characterization and electroanalytical application

Health Risk Assessment of Heavy Metals in Soils before Rice Sowing and at Harvesting in Southern Jiangsu Province, China

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