Nanoscale Clay Minerals for Functional Ecomaterials: Fabrication, Applications, and Future Trends

Wang, Wenbo; Wang, Aiqin

doi:10.1007/978-3-319-48281-1_125-1

Cited by 9 publications

(8 citation statements)

References 445 publications

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“…Attapulgite (AT) is a kind of rod-shaped hydrated magnesium-aluminosilicate clay mineral, whose crystal is an aggregation of acicular fibers. The single-fiber crystal is about 20 nm in diameter and up to 1 mm in length, which conforms to the size standard of nanometer materials …”

Section: Introductionsupporting

confidence: 60%

Preparation of Graphene Oxide/Attapulgite Composites and Their Demulsification Performance for Oil-in-Water Emulsion

Liu

Zhong

et al. 2021

Energy Fuels

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In this study, attapulgite (AT) and graphene oxide (GO) nanosheets were grafted together via a silane coupling agent to synthesize attapulgite−graphene oxide (AT−GO) composites and apply them to remove the emulsified oil from the oily wastewater. The structure and morphology of the AT−GO composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, zeta potential measurements, and transmission electron microscopy. The amphiphilicity of the AT−GO composites was evaluated by visual observation of their distribution in the oil−water mixture. The results showed that the AT−GO composites have been successively prepared and have good amphiphilic and interfacial activity. The effects of the pH, demulsifier dosage, temperature, and the mass ratio of AT and GO (R A/G ) in the composites on the demulsification performance of AT−GO were studied. It was found that the demulsification process could be completed efficiently and quickly at room temperature. Under optimal demulsification conditions, the demulsification efficiency is above 95%. The demulsification mechanism was studied and discussed. It is believed that the interaction behavior between the AT−GO material and the emulsified molecules of asphaltenes is a key for the demulsification. Once the nanoparticles are combined with the emulsified molecules, the external stirring, vibration, and other mechanical actions provide them enough kinetic energy to destroy the protective film at the oil/water interface and then promote the merging of dispersed oil droplets to realize the oil−water separation.

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Section: Introductionsupporting

confidence: 60%

Preparation of Graphene Oxide/Attapulgite Composites and Their Demulsification Performance for Oil-in-Water Emulsion

Liu

Zhong

et al. 2021

Energy Fuels

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“…These materials are currently involved in many environmental and industrial processes because of their catalytic and retention properties. [1][2][3][4] Understanding the fundamentals of clay-water interfaces is a crucial point for the success of those applications. Numerous computational [5][6] , experimental works using XRD 7 , quasi-elastic neutron scattering 8 or infrared spectroscopy 9 studied the swelling, water adsorption and cation exchange properties on MMT under controlled humidity conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The four circles represent the different systems probed : A) Na-MMT particles at 0 M ionic strength, B) Na-MMT particles at 10 -3 M ionic strength, C) pure water and D) Ca-MMT particles at 0 M ionic strength. In the four graphs on the right, the full circles represent the experimental I(γ,V u a h mp y qua s h xp m al I(γ,H u .The full and dashed lines are fits using equation(2).…”

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confidence: 99%

Second-Harmonic Scattering Can Probe Hydration and Specific Ion Effects in Clay Particles

et al. 2020

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We report Montmorillonite (MMT) particles organization in aqueous solution using polarization resolved second harmonic scattering (SHS). This technique can probe specifically the organization of water in this system. The effect of the colloidal stability of the particle and the nature of the interlayer cations on the SHS Intensity is highlighted. The interlayer hydration has been probed and changes with the order Mg 2+ > Ca 2+ > Li + , Na + , K + > Cs +. Real time SHS evolutions during cesium exchange have been monitored, and different pathways are discussed in regards with the experimental results.

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“…Attapulgite (ATP), also known as palygorskite, is a crystalline hydrated magnesium aluminum silicate mineral with a nanofiber‐like structure 13,14 . It has a large surface area, moderate cation exchange capacity, and a large number of Si‐OH groups on its surface, thus exhibiting excellent reactivity in dealcoholization of methoxy or active silanol groups (Si–OH, alkoxysilane is hydrolyzed to generate active silanol intermediates) in alkoxysilane 15,16 . For instance, Zhou et al 17 designed polyamidoamine dendrimer‐functionalized palygorskite (Pal‐PAMAM) to remove Pb 2+ and Reactive Red 3BS dyes.…”

Section: Introductionmentioning

confidence: 99%

“…13,14 It has a large surface area, moderate cation exchange capacity, and a large number of Si-OH groups on its surface, thus exhibiting excellent reactivity in dealcoholization of methoxy or active silanol groups (Si-OH, alkoxysilane is hydrolyzed to generate active silanol intermediates) in alkoxysilane. 15,16 For instance, Zhou et al 17 designed polyamidoamine dendrimer-functionalized palygorskite (Pal-PAMAM) to remove Pb 2+ and Reactive Red 3BS dyes. It was found the maximum adsorption capacity (q m ) for Reactive Red 3BS at 293 Kwas 34.2 ± 2.7, 69.9 ± 4.3, 122.0 ± 6.4, 242.7 ± 7.1, and 322.6 ± 6.9 mg/g for Pal-PAMAM G (n) (G stands for generation, n = 0, 1, 2, 3, and 4), respectively.…”

mentioning

confidence: 99%

Adsorption behaviors and mechanism of heavy metals onto attapulgite functionalized by polyamine silane

et al. 2020

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Pollution from heavy‐metal ions has become a major challenge to the global fight against environmental pollution. Given the availability of various low‐cost and environmentally friendly adsorbents, adsorption has become the most efficient technology for the removal of heavy metals from water. In this study, attapulgite (ATP) was directly functionalized by coupling with an aminosilane agent. Analysis showed this maneuver provided a suitable adsorbent for the removal of lead ion (Pb2+) from an aqueous solution. The effects of several parameters including solution pH, contacting time, adsorbent dosage, and initial Pb2+ ion concentration were investigated. Batch sorption results showed that the adsorption process was rapid and over 98% of Pb2+ was removed within 30 min at the optimal pH 4.0. The maximum adsorption capacity at 25°C, calculated by the Langmuir isotherm, was 82.17, 78.80, 61.13, and 28.56 mg/g for γ‐divinyltriaminepropyl‐methyldimethoxylsilane‐grafted attapulgite (KH‐103‐ATP), γ‐aminopropyl‐methyldiethoxysilane‐grafted attapulgite (KH‐912‐ATP), N‐(β‐aminoethyl‐γ‐aminopropyl)‐methyl‐dimethoxysilane‐grafted attapulgite (KH‐602‐ATP), and ATP, respectively. Moreover, molecular dynamics simulations of adsorption behaviors of heavy‐metal ions at attapulgite surfaces (010) modified by aminosilane agents were carried out. Both the PMF value and diffusion coefficient of metal ions suggest that KH‐103‐ATP owns the highest rate constant and capacity compared with the other two. And the analysis of free energy and results of XPS characterization revealed that Pb2+ formed covalent bonds with the nitrogen atom of aminosilane agents.

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Nanoscale Clay Minerals for Functional Ecomaterials: Fabrication, Applications, and Future Trends

Cited by 9 publications

References 445 publications

Preparation of Graphene Oxide/Attapulgite Composites and Their Demulsification Performance for Oil-in-Water Emulsion

Preparation of Graphene Oxide/Attapulgite Composites and Their Demulsification Performance for Oil-in-Water Emulsion

Second-Harmonic Scattering Can Probe Hydration and Specific Ion Effects in Clay Particles

Adsorption behaviors and mechanism of heavy metals onto attapulgite functionalized by polyamine silane

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