Critical analysis of adsorption/diffusion modelling as a function of time square root

Schwaab, Marcio; Steffani, Evandro; Barbosa-Coutinho, Elisa; Júnior, João Baptista Severo

doi:10.1016/j.ces.2017.07.037

Cited by 74 publications

(23 citation statements)

References 19 publications

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“…An adhesion kinetics with a square root dependence on time, i.e., ∝ t 1/2 , is indicative of a diffusion-controlled process, which occurs when there is no energy barrier for adhesion. Alternatively, the activation energy of adhesion is comparable with the thermal energy, k B T where k B is the Boltzmann constant and T is the absolute temperature 90 – 92 . Considering the zeta potential of bacteria (−37.1 mV for S .…”

Section: Resultsmentioning

confidence: 99%

The influence of surface chemistry on the kinetics and thermodynamics of bacterial adhesion

Yegin

Yang

et al. 2018

Sci Rep

147

119

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This work is concerned with investigating the effect of substrate hydrophobicity and zeta potential on the dynamics and kinetics of the initial stages of bacterial adhesion. For this purpose, bacterial pathogens Staphylococcus aureus and Escherichia coli O157:H7 were inoculated on the substrates coated with thin thiol layers (i.e., 1-octanethiol, 1-decanethiol, 1-octadecanethiol, 16-mercaptohexadecanoic acid, and 2-aminoethanethiol hydrochloride) with varying hydrophobicity and surface potential. The time-resolved adhesion data revealed a transformation from an exponential dependence to a square root dependence on time upon changing the substrate from hydrophobic or hydrophilic with a negative zeta potential value to hydrophilic with a negative zeta potential for both pathogens. The dewetting of extracellular polymeric substances (EPS) produced by E. coli O157:H7 was more noticeable on hydrophobic substrates, compared to that of S. aureus, which is attributed to the more amphiphilic nature of staphylococcal EPS. The interplay between the timescale of EPS dewetting and the inverse of the adhesion rate constant modulated the distribution of E. coli O157:H7 within microcolonies and the resultant microcolonial morphology on hydrophobic substrates. Observed trends in the formation of bacterial monolayers rather than multilayers and microcolonies rather than isolated and evenly spaced bacterial cells could be explained by a colloidal model considering van der Waals and electrostatic double-layer interactions only after introducing the contribution of elastic energy due to adhesion-induced deformations at intercellular and substrate-cell interfaces. The gained knowledge is significant in the context of identifying surfaces with greater risk of bacterial contamination and guiding the development of novel surfaces and coatings with superior bacterial antifouling characteristics.

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Section: Resultsmentioning

confidence: 99%

The influence of surface chemistry on the kinetics and thermodynamics of bacterial adhesion

Yegin

Yang

et al. 2018

Sci Rep

147

119

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“…The results obtained show that for sample and sample-Cl , the isosteric heats are constant with loading, increasing at low loading in the case of sample-Na and sample-S . Schwaab et al 46 reported that the evolution of the isosteric heats with adsorbate loading can be related to the energetically homogeneous/heterogeneous character of the adsorbents. In the case of sample and sample-Cl , the samples are energetically homogeneous toward CO 2 adsorption.…”

Section: Resultsmentioning

confidence: 99%

Application of Industrial Wastes from Chemically Treated Aluminum Saline Slags as Adsorbents

et al. 2018

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In this study, industrial wastes, which remain after aluminum extraction from saline slags, were used as adsorbents. The aluminum saline slags were treated under reflux with 2 mol/dm 3 aqueous solutions of NaOH, H 2 SO 4 , and HCl for 2 h. After separation by filtration, aqueous solutions containing the extracted aluminum and residual wastes were obtained. The wastes were characterized by nitrogen adsorption at −196 °C, X-ray diffraction, scanning electron microscopy, and ammonia pulse chemisorption. The chemical treatment reduced the specific surface area, from 84 to 23 m 2 /g, and the pore volume, from 0.136 to 0.052 cm 3 /g, of the saline slag and increased the ammonia-adsorption capacity from 2.84 to 5.22 cm 3 /g, in the case of acid-treated solids. The materials were applied for the removal of Acid Orange 7 and Acid Blue 80 from aqueous solutions, considering both single and binary systems. The results showed interesting differences in the adsorption capacity between the samples. The saline slag treated with HCl rapidly adsorbed all of the dyes present in solution, whereas the other materials retained between 50 and 70% of the molecules present in solution. The amount of Acid Orange 7 removed by the nontreated material and by the material treated with NaOH increased in the presence of Acid Blue 80, which can be considered as a synergistic behavior. The CO 2 adsorption of the solids at several temperatures up to 200 °C was also evaluated under dry conditions. The aluminum saline slag presented an adsorption capacity higher than the rest of treated samples, a behavior that can be explained by the specific sites of adsorption and the textural properties of the solids. The isosteric heats of CO 2 adsorption, determined from the Clausius–Clapeyron equation, varied between 1.7 and 26.8 kJ/mol. The wastes should be used as adsorbents for the selective removal of organic contaminants in wastewater treatment.

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“…e nonappearance of such feature points to that the experimental data do not t the intraparticle di usion model because of low values of R 2 ≤ 93, in comparison with the high values of R 2 estimated from the pseudo-second-order model and the intraparticle di usion was not only the limiting control step. Moreover, the plot does not pass through the origin, indicating that the rst stage of this plot involved boundary layer adsorption [42]. …”

Section: Kinetic Modelmentioning

confidence: 99%

Sodium Dodecyl Sulfate-Modified Fe₂O₃/Molecular Sieves for Removal of Rhodamine B Dyes

AbdulRazak

Rohani

2018

Advances in Materials Science and Engineering

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Studying the removal of rhodamine B (RB) dye by using zeolite 13X molecular sieves supported by Fe 2 O 3 nanoparticles (denoted as Fe 2 O 3 -13X) is the main objective of this study. Fe 2 O 3 -13X was synthesized and modified by the addition of sodium dodecyl sulfate (SDS). e prepared Fe 2 O 3 -13X was characterized by XRD, TEM, SEM, and zeta potential. e effects of the solution pH, SDS amount, contact time, initial dye concentration, and adsorbent dosage on the removal efficiency of RB were studied. A maximum removal efficiency of 99.3% was achieved. e adsorption equilibrium data of RB were fitted using the Freundlich model, yielding the maximum adsorption capacity of 89.3 mg/g. e findings revealed that the RB adsorption onto Fe 2 O 3 -13X modified with SDS (Fe2O3-13X-Ms) was described by a pseudo-second-order kinetic equation. e results reported in this paper indicate that a high RB removal percentage was attained by adding SDS to Fe 2 O 3 -13X.

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Critical analysis of adsorption/diffusion modelling as a function of time square root

Cited by 74 publications

References 19 publications

The influence of surface chemistry on the kinetics and thermodynamics of bacterial adhesion

The influence of surface chemistry on the kinetics and thermodynamics of bacterial adhesion

Application of Industrial Wastes from Chemically Treated Aluminum Saline Slags as Adsorbents

Sodium Dodecyl Sulfate-Modified Fe₂O₃/Molecular Sieves for Removal of Rhodamine B Dyes

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Critical analysis of adsorption/diffusion modelling as a function of time square root

Cited by 74 publications

References 19 publications

The influence of surface chemistry on the kinetics and thermodynamics of bacterial adhesion

The influence of surface chemistry on the kinetics and thermodynamics of bacterial adhesion

Application of Industrial Wastes from Chemically Treated Aluminum Saline Slags as Adsorbents

Sodium Dodecyl Sulfate-Modified Fe2O3/Molecular Sieves for Removal of Rhodamine B Dyes

Contact Info

Product

Resources

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Sodium Dodecyl Sulfate-Modified Fe₂O₃/Molecular Sieves for Removal of Rhodamine B Dyes