High-pressure homogenization associated hydrothermal process of palygorskite for enhanced adsorption of Methylene blue

Zhang, Zhifang; Wang, Wenbo; Wang, Aiqin

doi:10.1016/j.apsusc.2014.12.187

Cited by 30 publications

(7 citation statements)

References 38 publications

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“…For natural sepiolite (without any physical or chemical treatment), the particles have an isoelectric point at pH ≈ 6 [20,21], although the substitution of the exchange divalent cations by monovalent ones provokes that the positive branch of the zeta potential, at pH < pH(iep), disappears [21]. In fact, when natural palygorskite clays, which have a structure and chemical composition practically identical to sepiolite [14], are treated with solutions of alkaline ions or, alternatively, dispersed in acid solution to remove impurities, such as carbonates, the zeta potentials reported have negative values at acid and also at basic pH [13,22,23]. Therefore, when the impurities are removed or the exchange multivalent cations are replaced by monovalent ones, the electrochemistry of the solid/liquid interface of the sepiolite particles is mainly dominated by the reactions with the silanol (Si-O-H) groups, as occurs for silica particles.…”

Section: Results and Discussion (A) Particle Characterizationmentioning

confidence: 99%

Mechanical properties of magnetic gels containing rod-like composite particles

Abrougui

López–López

Durán

2019

Phil. Trans. R. Soc. A.

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Magnetic gels (ferrogels) are heterogeneous systems structured at the nanoscale that contains magnetic particles dispersed in three-dimensional networks of polymer chains. In the present work, the magnetic particles were synthesized with a core–shell structure, consisting of sepiolite particles covered by magnetite nanoparticles. These composite particles had a rod-like shape with a high aspect ratio. The obtained sepiolite–magnetite particles showed a high enough susceptibility and saturation magnetization. The magneto-rheological (MR) properties, and the intensity of the MR effect, of aqueous suspensions of the synthesized particles were studied. The particles, functionalized by adsorption of alginate molecules, were imbedded in alginate hydrogels to get homogeneous soft materials. The particles were linked to the polymer chains as the knots in a network and dominated in a great extent the mechanical properties of the materials. After determining the optimal compositions of the ferrogels, their viscoelastic properties were measured in the absence/presence of magnetic fields. The results pointed out that the MR effect provided by the clay–magnetite particles was considerably more intense than those achieved in ferrogels that contain spherical magnetic microparticles. Therefore, the imbedding of rod-shaped magnetic particles in hydrogels allows controlling the mechanical properties in a wider range than in conventional ferrogels. This article is part of the theme issue ‘Heterogeneous materials: metastable and non-ergodic internal structures’.

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Section: Results and Discussion (A) Particle Characterizationmentioning

confidence: 99%

Mechanical properties of magnetic gels containing rod-like composite particles

Abrougui

López–López

Durán

2019

Phil. Trans. R. Soc. A.

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“…During ball-milling, the cellulose can protect the exfoliated BNNSs from being reaggregation and severely destroyed in violent collisions. The high-pressure homogenization technique is often used to dissociate the cellulose bers and palygorskite rod (Zhang et al 2015), which are intrinsically composed by 1D nanometer clustered beam and have relative weak interactions between the nano bers or nanorods.…”

Section: Resultsmentioning

confidence: 99%

Highly water-dispersed composite of cellulose nanofibers and boron nitride nanosheets

et al. 2022

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In this work, a composite of cellulose nano bers (CNFs) and boron nitride nanosheets (BNNSs) with high dispersity in water is prepared via the combination of ball-milling and high-pressure homogenization, which is then transformed into paper-like lm by vacuum assisted ltering and drying. The obtained CNF/BNNS dispersions can stably exist over 30 days without the observation of sediments. CNFs as a medium of ball-milling can protect the exfoliated BNNSs from being reaggregation and severely destroyed in violent collisions, and the BNNSs and CNFs can promote their exfoliation with each other.The hydrophilicity and electrostatic repulsion of CNFs, as well as the strong interfacial interactions and stereo-hindrance effects between one-dimensional (1D) CNFs and two-dimensional (2D) BNNSs are the reasons for the high dispersity of the composite in water, which in turn results in the favorable mechanical properties of the formed lms. Although the introduction of BNNSs lowers the stress, strain, and toughness of the neat CNF lms, but increases their modulus due to the stiffness of BNNSs.However, the thermal conductivities of the homogenized samples are inferior to the unhomogenized ones, as the decreased lateral sizes and excellent dispersibility of BNNSs are unfavorable to the formation of connective path of thermal conduction.

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“…Except for modification methods mentioned earlier, a large number of studies supplied new insights to functionalize ATP to increase adsorption capacity, even though these materials were difficult to recycle. Generally, there are five main ways to improve adsorption capacity: (1) physical and chemical pretreatments (such as heat or acid treatment), ,− (2) controlling of Si and Mg or Zn ratio, , (3) disaggregation of crystal bundles via high-pressure homogenization, , (4) surface coating (e.g., chitosan or carbon), − (5) grafting of functional groups especially amino or carboxyl groups. ,, Among five methods, physical and chemical pretreatments are the easiest methods, but adsorption performance are always unsatisfactory. The modification method of controlling of Si and Mg or Zn ratio is not universal, only for low-grade mineral.…”

Section: Magnetic Attapulgite Adsorption Materialsmentioning

confidence: 99%

Designing of Recyclable Attapulgite for Wastewater Treatments: A Review

Wang

Feng

Jiang

et al. 2018

ACS Sustainable Chem. Eng.

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Due to the low cost, and extraordinary physical and chemical properties, attapulgite (ATP) has sparked considerable interest as water remediation materials. Since traditional ATP nanomaterials have inherent limitations in separation and recycle, this paper focuses on designs of recyclable attapulgite composites, which show great potential in practical environmental remediation. First, the advantages of ATP properties are highlighted and discussed in comparison with other one-dimensional materials. Then, three types of strategies are summarized to fabricate recyclable ATP nanocomposites: (1) magnetic attapulgite adsorption materials, (2) millimeter-sized attapulgite-based adsorbents, and (3) filtration membranes/meshes. Additionally, the syntheses, applications, and corresponding mechanisms toward numerous pollutants are included. Finally, challenges and future prospects of fabrications and applications are presented.

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High-pressure homogenization associated hydrothermal process of palygorskite for enhanced adsorption of Methylene blue

Cited by 30 publications

References 38 publications

Mechanical properties of magnetic gels containing rod-like composite particles

Mechanical properties of magnetic gels containing rod-like composite particles

Highly water-dispersed composite of cellulose nanofibers and boron nitride nanosheets

Designing of Recyclable Attapulgite for Wastewater Treatments: A Review

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