Colloidal Structures in Biology

Freundlich, H.

doi:10.1021/j150387a001

Cited by 32 publications

(12 citation statements)

References 20 publications

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“…14. It is clear that there is a very mild increase in the adsorption when increasing the mercury concentration, especially in the lower concentration range, indicating high affinity performance [49]. The amount of mercury adsorption is calculated by: Fig.…”

Section: Effect Of Initial Mercury Concentrationmentioning

confidence: 99%

The removal of mercury (II) from water by Ag supported on nanomesoporous silica

2016

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In this study, the synthesis of SBA-15/Ag nanocomposite materials with different amounts of silver (2.5, 5, and 10 %) has been investigated under acidic conditions by using P123 as a template via the direct method. The nanocomposites of SBA-15 were synthesized by the same method and by the addition of silver salt. Finally, the nanocomposite materials were examined for the removal of mercury ions from wastewater as an adsorbent by the reverse titration method. Characterization was carried out through x-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N 2 adsorption-desorption (Brunauer-EmmettTeller). XRD spectra confirmed the presence of silver nanoparticles within the amorphous silica matrix of SBA-15. The Barrett-Joyner-Halenda analysis showed that SBA-15 and SBA-15/Ag have a narrow pore size distribution. SEM images demonstrated that the morphology of the matrix of SBA-15 is in spherical state. Furthermore, wavelength dispersive x-ray spectroscopy identified the presence and distribution of silver nanoparticles inside the pore channels and outside of them. Typical TEM images of SBA-15 and SBA-15/Ag (5 wt.%) indicated a regular hexagonal pore structure with long-range order and long channels. In SBA-15/Ag (5 wt.%) sample, the nanoparticles of silver was found into the pores and outside of them. The removal of mercury ions from wastewater using mesoporous silica nanocomposite containing silver nanoparticles was studied by the reverse titration analysis. The best capacity of adsorption of mercury ions from wastewater was obtained for SBA-15/Ag (5 wt.%) sample, which was equal to 42.26 mg/g in 20 min at pH of 7. The Freundlich model was used to explain the adsorption characteristics for the heterogeneous surface, and K f (adsorption capacity) and n (adsorption intensity) were determined for Hg (II) ion adsorption on SBA-15/Ag nanocomposite materials with different amounts of silver (2.5, 5, and 10 %). The value of R 2 was about 0.99, 0.99, 0.98, and 0.98 and K f was about 42, 48, 58, and 58 mg/g for SBA-15/Ag, SBA-15/Ag (2.5 %), SBA-15/Ag (5 %), and SBA-15/Ag (10 %), respectively. Furthermore, the values of n >1 show a favorable adsorption process for Hg (II) ion adsorption on SBA-15/Ag nanocomposite materials. Moreover, the Langmuir isotherm model evaluation showed that the correlation coefficients for all concentrations were R 2 >0.99, indicating that Hg (II) ions were adsorbed on the surface of SBA-15/Ag via chemical and physical interaction. Additionally, the analytic hierarchy process (AHP) and Technique of Order Preference Similarity to the Ideal Solution (TOPSIS) methods that depend on the criteria of the surface area, amount of adsorbent, pore volume, and cost of synthesis were used. The evaluation of results showed that the best sample was SBA-15/Ag (5 wt.%). Furthermore, the research work highlighted the antibacterial nanocomposite with suitable adsorption of Hg (II) ions from water solutions and supported its potential for environme...

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Section: Effect Of Initial Mercury Concentrationmentioning

confidence: 99%

The removal of mercury (II) from water by Ag supported on nanomesoporous silica

2016

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“…In this work, the Langmuir isotherm [13] and the Freundlich isotherm [14] were used for modeling uptake equilibrium data. The two isothermal equations were expressed as…”

Section: Equilibrium Isothermsmentioning

confidence: 99%

Lithium uptake in fixed-pH solution by ion sieves

Wang

Meng

Mei

et al. 2008

Journal of Colloid and Interface Science

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“…The similarity in shape likely has to do with a minimization of the free energy density where there is a competition between the splay and bending elastic energies and the surface tension of a droplet [24,28]. It is thus not surprising that tactoids of similar shapes are found in two distinct types of actin granules, in concentrated suspensions of tobacco mosaic virus (TMV) [29], and in that of filamentous phage fd [30].…”

mentioning

confidence: 99%

Isotropic to Nematic Liquid Crystalline Phase Transition ofF-Actin Varies from Continuous to First Order

2006

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We report that the properties of the isotropic to nematic liquid crystalline phase transition of F-actin depend critically on the average filament length. For average filament lengths longer than 2 microm, we confirm previous findings that the phase transition is continuous in both alignment and concentration. For average filament lengths shorter than 2 microm, we show for the first time a first order transition with a clear discontinuity in both alignment and concentration. Tactoidal droplets of coexisting isotropic and nematic phases, differing in concentration by approximately 30%, form over the course of hours and appear to settle into near equilibrium metastable states.

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Colloidal Structures in Biology

Cited by 32 publications

References 20 publications

The removal of mercury (II) from water by Ag supported on nanomesoporous silica

The removal of mercury (II) from water by Ag supported on nanomesoporous silica

Lithium uptake in fixed-pH solution by ion sieves

Isotropic to Nematic Liquid Crystalline Phase Transition ofF-Actin Varies from Continuous to First Order

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