Layer structured graphite oxide as a novel adsorbent for humic acid removal from aqueous solution

Hartono, Tri; Wang, Shaobin; Ma, Qiang; Zhu, Zhonghua

doi:10.1016/j.jcis.2009.02.005

Cited by 194 publications

(105 citation statements)

References 29 publications

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“…Hydrogen bonding typically occurs between nanoparticles or colloids with abundant oxygen-containing groups such as functionalized NPs, metallic oxides NPs, clays, and NOM etc. [99,128,129,148]. Sun et al [129] reported that SiO 2 NPs attached to CNT surfaces via both van der Waals forces and hydrogen bonds.…”

Section: Hydrogen Bondingmentioning

confidence: 99%

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Wang

Adeleye

Huang

et al. 2015

Advances in Colloid and Interface Science

166

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The application of nanoparticles has raised concern over the safety of these materials to human health and the ecosystem. After release into an aquatic environment, nanoparticles are likely to experience heteroaggregation with biocolloids, geocolloids, natural organic matter (NOM) and other types of nanoparticles. Heteroaggregation is of vital importance for determining the fate and transport of nanoparticles in aqueous phase and sediments. In this article, we review the typical cases of heteroaggregation between nanoparticles and biocolloids and/or geocolloids, mechanisms, modeling, and important indicators used to determine heteroaggregation in aqueous phase. The major mechanisms of heteroaggregation include electric force, bridging, hydrogen bonding, and chemical bonding. The modeling of heteroaggregation typically considers DLVO, X-DLVO, and fractal dimension. The major indicators for studying heteroaggregation of nanoparticles include surface charge measurements, size measurements, observation of morphology of particles and aggregates, and heteroaggregation rate determination. In the end, we summarize the research challenges and perspective for the heteroaggregation of nanoparticles, such as the determination of α hetero values and heteroaggregation rates; more accurate analytical methods instead of DLS for heteroaggregation measurements; sensitive analytical techniques to measure low concentrations of nanoparticles in heteroaggregation systems; appropriate characterization of NOM at the molecular level to understand the structures and fractionation of NOM; effects of different types, concentrations, and fractions of NOM on the heteroaggregation of nanoparticles; the quantitative adsorption and desorption of NOM onto the surface of nanoparticles and heteroaggregates; and a better understanding of the fundamental mechanisms and modeling of heteroaggregation in natural water which is a complex system containing NOM, nanoparticles, biocolloids and geocolloids.

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Section: Hydrogen Bondingmentioning

confidence: 99%

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Wang

Adeleye

Huang

et al. 2015

Advances in Colloid and Interface Science

166

View full text Add to dashboard Cite

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“…As seen, the equilibrium concentration 14 (C e , g L -1 ) and equilibrium adsorption capacity values (q e , mg g -1 ) were fitted by their linearized expressions [29][30][31][32][42][43][44]. Accordingly, the maximum adsorption capacity for GO and SRGO were calculated by the Langmuir equation, as follows:…”

Section: Adsorption Of Go-based Materialsmentioning

confidence: 99%

“…AO is positively charged in nature; accordingly, the electrostatic interaction is the primary binding strength [29]. Because all adsorptions were conducted in weakly acidic conditions (pH 4-5) without pH adjustment, the main interaction between GO and AO relates to the formation of hydrogen bonds [43].…”

Section: Adsorption Of Go-based Materialsmentioning

confidence: 99%

“…We consider the dilution be an important factor that promotes fully exfoliated GO sheets in the aqueous environment and more access to functional groups as the oxygen functional groups contribute more to adsorption [43,45,46]. The SRGO performance involved not only the influence of the dilution but also the functionality changes resulting from the in situ reduction.…”

Section: Adsorption Of Go-based Materialsmentioning

confidence: 99%

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Graphene oxide adsorption enhanced by in situ reduction with sodium hydrosulfite to remove acridine orange from aqueous solution

Sun

Fugetsu

2012

Journal of Hazardous Materials

197

107

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Graphene oxide (GO) is a highly effective adsorbent, and its absorbing capability is further enhanced through its in situ reduction with sodium hydrosulfite as the reductant. Acridine orange is the selected target to eliminate with GO as the adsorbent.Under identical conditions, GO without the in situ reduction showed a maximum adsorption capacity of 1.4 g g -1 , and GO with the in situ reduction provided a maximum adsorption capacity of 3.3 g g -1 . Sodium hydrosulfite converts carbonyl groups on GO into hydroxyl groups, which function as the key sites for the adsorption enhancement.

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“…Recently, the application of nanomaterials in water management has attracted significant attentions due to the advantages of large surface areas and more active functionalized sites [24]. Several studies have been done to test carbon materials such as activated carbon [16], carbon nanotubes [17], graphite oxide [18][19][20], graphene and graphene oxide [21][22][23][24]. Graphene oxide (GO) attracts highest interest as it is a precursor of graphene [30][31][32][33], the fascinating two dimensional carbon-based material possessing atomic thickness, which attracted considerable attention world over, since the report of Novoselov et al [25].…”

Section: Introductionmentioning

confidence: 99%