Design and synthesis of pyrophosphate acid/graphene composites with wide stacked pores for methylene blue removal

Wang, Chubei; Zhou, Jianwei; Ni, Jun; Cheng, Yuliang; Li, Hui

doi:10.1016/j.cej.2014.05.020

Cited by 21 publications

(6 citation statements)

References 44 publications

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“…Another reason could be the functionalized groups and benzene rings in GO-A which are higher than GO affecting the π-π interaction resulting in the increasing of the adsorption capacity. Consequently, modification of adsorbent can be developed adsorption capacity [43]. Table 7 compares the q e values obtained in this study with those of other adsorbents including zeolite, carbon nanotube, activated carbon, montmorillonite modified with poly ethylene glycol, smectite organoclay, thermally modified diatomite, and ostrich bone waste-loaded a cationic surfactant.…”

Section: Regeneration Of Adsorbentsmentioning

confidence: 94%

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Adsorption performance of modified graphene oxide nanoparticles for the removal of toluene, ethylbenzene, and xylenes from aqueous solution

Azizi

Torabian

Hassani

et al. 2016

Desalination and Water Treatment

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A B S T R A C TThe purpose of this study was to investigate the effect of graphene oxide nanoparticles modified with 4-aminodiphenylamine (GO-A) on the removal of toluene, ethylbenzene, and p-,o-xylene (TEX). Nano-sorbent was characterized using Fourier transform infrared resonance spectroscopy, carbon, hydrogen and nitrogen elemental analysis, BrunauerEmmett-Teller analysis, and transmission electron microscopy. The effect of different experimental parameters including contact time, pH, and initial concentration of adsorbate and adsorbent were examined. According to the results, an optimum TEX removal efficiency was observed at contact time = 5 min, pH 4, and adsorbent dose = 1 g/L at 20 mg/L initial TEX concentration. Besides, the point of zero charge (pH pzc ) was evaluated to be 4. The adsorption isotherms (Langmuir, Freundlich, and Dubinin-RadushKevich) and kinetics (pseudo-first-order, pseudo-second-order, intraparticle diffusion, and Elovich) were used to indicate the isotherm and kinetic parameters. The adsorption process followed Langmuir isotherm and pseudo-second-order kinetic. Finally, GO-A was regenerated at seven cycles for the TEX removal confirming its good regeneration capacity.

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Section: Regeneration Of Adsorbentsmentioning

confidence: 94%

“…But the total pore volume and average pore diameter of GO-A (0.133 cm 3 /g, 42.879 nm) are much higher than that of GO (0.016 cm 3 /g, 4.853 nm). It can be explained by the fact that some groups connected to graphene layers act as spacers, resulting in the enhanced pore size distribution during aggregation [43].…”

Section: Adsorbent Characteristicsmentioning

confidence: 99%

Adsorption performance of modified graphene oxide nanoparticles for the removal of toluene, ethylbenzene, and xylenes from aqueous solution

Azizi

Torabian

Hassani

et al. 2016

Desalination and Water Treatment

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“…Compared with the peak of graphitic sp 2 carbon atoms, the peaks of C-O and C=O are weak. In some similar reports about RGO [13,26], the ratio of C to O is about 5. The ratio of C to O in HRGO is 9 in Table 1, also indicating that HRGO is highly reduced.…”

Section: Characterization Of Hrgo the Morphologies And Microstructurmentioning

confidence: 76%

“…The HRGO was dried at 50 ∘ C for 12 h to yield a black fluffy powder (0.36 g). Other samples were calcined at 240, 280, and 360 ∘ C. The RGO was prepared according to that of a previous literature [13].…”

Section: Synthesis Of Hrgo and Rgomentioning

confidence: 99%

Synthesis of Highly Reduced Graphene Oxide for Supercapacitor

Wang

Zhou

2016

Journal of Nanomaterials

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A facile method to synthesize highly reduced graphene oxide in solid phase was developed. The reduced graphene oxide was scarcely prepared in solid phase. Solid substances act as spacers and pillaring agents. Sheets can not be close to each other in reduction process, and sheets agglomeration might not form. After reduction reaction is complete, the spacers and pillaring agents are removed. The average interlayer spacing and surface area of product are bigger than those of reduced graphene oxide. The product has few-layered sheet, and the ratio of carbon to oxygen is high, which might imply that the product is more similar to graphene compared to reduced graphene oxide. The specific capacitance of product is almost three times higher than that of reduced graphene oxide at the same current density.

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“…Generally, the permeation properties of fiber membranes can be improved by surface modification (for example, adsorption properties) [13,14] and the structural adjustment of the pores/channels [15][16][17]. In addition to enhancing the adsorption capacity, modification of pore/channel structures could be an alternative and effective strategy to improve the retention ability of these films [18,19]. Unfortunately, restricted by the fiber structures and the disorder assembling process of these fibers, the size of the as-formed pores (channels) in fibrous membranes are still hard to be well controlled.…”

Section: Graphical Abstractmentioning

confidence: 99%

Processable graphene oxide-embedded titanate nanofiber membranes with improved filtration performance

Wang

et al. 2017

Journal of Hazardous Materials

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Processable graphene oxide-embedded titanate nanofiber membranes with improved filtration performance, Journal of Hazardous Materials http://dx.doi.org/10.1016/j.jhazmat. 2016.11.077 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights Graphene oxide embedded titanate fiber films with good processability are prepared  The content of graphene oxide sheets and thickness of films can be adjusted easily  Embedded graphene oxide sheets improve the filtration property of fibrous films  Such composite films also exhibit enhanced selectivity performance. Abstract 3Graphene oxide (GO)-embedded titanate nanofiber (TNF) membranes with improved filtration performance are prepared successfully by a two-step method including electrostatic assembly of GO and TNFs into hybrids and subsequent processing of them into membranes by vacuum filtration. The embedded contents of GO sheets in films and thickness of as-assembled films can be adjusted facilely, endowing such composite films with good processability. Owing to the skilful introduction of GO sheets, the pore and/or channel structures in these hybrid membranes are modified. By treating different dye solutions (Direct Yellow and Direct Red), the filtration properties of these membranesshow that the introduction of certain amount of GO sheets efficiently improve the separation performance of the membranes. Interestingly, these GO-embedded TNF membranes also display superior selective separation performance on filtrating the mixture solutions of such two dyes, making these hierarchical membranes more flexible and versatile in water treatment areas.

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Design and synthesis of pyrophosphate acid/graphene composites with wide stacked pores for methylene blue removal

Cited by 21 publications

References 44 publications

Adsorption performance of modified graphene oxide nanoparticles for the removal of toluene, ethylbenzene, and xylenes from aqueous solution

Adsorption performance of modified graphene oxide nanoparticles for the removal of toluene, ethylbenzene, and xylenes from aqueous solution

Synthesis of Highly Reduced Graphene Oxide for Supercapacitor

Processable graphene oxide-embedded titanate nanofiber membranes with improved filtration performance

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