Modification of graphene aerogel with titania nanotubes for efficient methylene blue adsorption kinetics

Liu, Hongli; Gao, Bo; Yuan, Wenjin; Li, Hongyan; Li, Jing; Zhang, Bo; Chen, Zhong

doi:10.1007/s10971-020-05449-y

Cited by 8 publications

(3 citation statements)

References 48 publications

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“…Considering that the removal process involving nZVI contains an adsorption step resulting in an equilibrium effect, two kinetic models, pseudo-first-order and pseudo-second-order, were adopted to analyze the kinetics of the fresh and pre-corroded D201-nZVI. The non-linear forms of pseudo-first-order or pseudo-second-order kinetic equations could be followed as shown in Equations (1) and (2), respectively [ 27 , 28 ].

where Q e and Q t are the adsorption capacity of Cr(VI) (mg/g) at the equilibrium and time t, respectively, and k 1 and k 2 are the pseudo-first-order and pseudo-second-order rate constants, respectively.…”

Section: Resultsmentioning

confidence: 99%

Section: Cr(vi) Removal Kinetics Of the D201-nzvi Before And After Corrosionmentioning

confidence: 99%

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Effect of Spatial Distribution of nZVI on the Corrosion of nZVI Composites and Its Subsequent Cr(VI) Removal from Water

Huang

Song

et al. 2022

Nanomaterials

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There have been many studies on contaminant removal by fresh and aged nanoscale zero-valent iron (nZVI), but the effect of spatial distribution of nZVI on the corrosion behavior of the composite materials and its subsequent Cr(VI) removal remains unclear. In this study, four types of D201-nZVI composites with different nZVI distributions (named D1, D2, D3, and D4) were fabricated and pre-corroded in varying coexisting solutions. Their effectiveness in the removal of Cr(VI) were systematically investigated. The results showed acidic or alkaline conditions, and all coexisting ions studied except for H2PO4− and SiO32− enhanced the corrosion of nZVI. Additionally, the Cr(VI) removal efficiency was observed to decrease with increasing nZVI distribution uniformity. The corrosion products derived from nZVI, including magnetite, hematite, lepidocrcite, and goethite, were identified by XRD. The XPS results suggested that the Cr(VI) and Cr(III) species coexisted and the Cr(III) species gradually increased on the surface of the pre-corroded D201-nZVI with increasing iron distribution uniformity, proving Cr(VI) removal via a comprehensive process including adsorption/coprecipitation and reduction. The results will help to guide the selection for nZVI nanocomposites aged under different conditions for environmental decontamination.

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Section: Resultsmentioning

confidence: 99%

Section: Cr(vi) Removal Kinetics Of the D201-nzvi Before And After Corrosionmentioning

confidence: 99%

Effect of Spatial Distribution of nZVI on the Corrosion of nZVI Composites and Its Subsequent Cr(VI) Removal from Water

Huang

Song

et al. 2022

Nanomaterials

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“…Hydrophobic graphene aerogel (GA) synthesized by the hydrothermal method, due to its high oil absorption performance, no pollution to the environment, and good selective oil absorption performance in water, makes it a relatively good choice in the treatment of marine oil spill accidents [23,24]. However, in terms of practical application, due to the easy coalescence of GO during the initial reaction, its products often have problems such as high brittleness, fragility, hygroscopicity, and non-renewability, which limit its commercial use [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of PDMS/GA Composite Materials by Pickering Emulsion Method and Its Application for Oil-Water Separation

et al. 2021

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With the intensification of human activities, a large amount of oil and organic solvent waste has been created, resulting in serious ecological and environmental pollution. Therefore, how to balance environmental benefits and economic benefits control a large number of organic solvent and oil pollution is an urgent problem. To solve this problem, a highly efficient oil-water separation material was designed and prepared in this paper. Graphene oxide aerogels were synthesized by the Pickering emulsion and hydrothermal method, and then hydrophobically lipophilic polydimethylsiloxane (PDMS) reduced graphene oxide aerogel composites (PDMS/GA) were obtained by modification of PDMS. The surface functional groups, hydrophobicity, thermal stability, and micromorphology of the materials were tested by various characterization methods. Their properties were tested by an oil absorption test and repeated experiments. The oil absorption performance experiments and repeated performance experiments of PDMS/GA are reported. The number of oxy-gen-containing functional groups of the modified graphene oxide (GO) decreased, and the contact angle of water was 134.4°. The adsorption capacity of n-hexane was up to 18.5 times its own weight. The material has the advantages of being lightweight, easy to recover, good hydrophobicity and lipophilicity, and has the potential for large-scale applications in the field of oil-water separation.

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A comprehensive review of graphene-based aerogels for biomedical applications. The impact of synthesis parameters onto material microstructure and porosity

Trembecka-Wójciga

Sobczak

2023

Archiv.Civ.Mech.Eng

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Graphene-based aerogels (GA) have a high potential in the biomedical engineering field due to high mechanical strength, biocompatibility, high porosity, and adsorption capacity. Thanks to this, they can be used as scaffolds in bone tissue engineering, wound healing, drug delivery and nerve tissue engineering. In this review, a current state of knowledge of graphene (Gn) and graphene oxide (GO) aerogels and their composites used in biomedical application is described in detail. A special focus is paid first on the methods of obtaining highly porous materials by visualizing the precursors and describing main methods of Gn and GO aerogel synthesis. The impact of synthesis parameters onto aerogel microstructure and porosity is discussed according to current knowledge. Subsequent sections deal with aerogels intended to address specific therapeutic demands. Here we discuss the recent methods used to improve Gn and GO aerogels biocompatibility. We explore the various types of GA reported to date and how their architecture impacts their ultimate ability to mimic natural tissue environment. On this basis, we summarized the research status of graphene-based aerogels and put forward the challenges and outlook of graphene-based aerogels dedicated to biomedical usage especially by formation of joints with biocompatible metals.

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Modification of graphene aerogel with titania nanotubes for efficient methylene blue adsorption kinetics

Cited by 8 publications

References 48 publications

Effect of Spatial Distribution of nZVI on the Corrosion of nZVI Composites and Its Subsequent Cr(VI) Removal from Water

Effect of Spatial Distribution of nZVI on the Corrosion of nZVI Composites and Its Subsequent Cr(VI) Removal from Water

Fabrication of PDMS/GA Composite Materials by Pickering Emulsion Method and Its Application for Oil-Water Separation

A comprehensive review of graphene-based aerogels for biomedical applications. The impact of synthesis parameters onto material microstructure and porosity

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