Effect of electrostatic interaction on the methylene blue and methyl orange adsorption by the pristine and functionalized carbon nanotubes

Robati, D.; Bagheriyan, S.; Rajabi, Mostafa; Moradi, Omid; Peyghan, Ali Ahmadi

doi:10.1016/j.physe.2016.04.005

Cited by 73 publications

(11 citation statements)

References 39 publications

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“…The results for the kinetic models are then reported in Figure and Table . The linear form of kinetics models can be expressed as follows:

\ln ((), q_{e} - q_{t}) = \ln ((), q_{e}) - k_{1} t

\frac{t}{q_{t}} = \frac{1}{k_{2} q_{e}^{2}} + \frac{t}{q_{e}}

q_{t} = k_{p} \times \sqrt{t} + c

where q t is the amount of BSA per unit of PES (mg g −1 ) at time t (min), k 1 is the rate constant of pseudo‐first‐order model (min −1 ), and k 2 is the rate constant of pseudo‐second‐order model (g mg −1 min −1 ). k p is the rate constant of intraparticle transport (mg g −1 min −0.5 ) and c is the intercept (mg g −1 ).…”

Section: Resultsmentioning

confidence: 99%

Protein–polymer interaction: Transfer loading at interfacial region of PES‐based membrane and BSA

Sadegh

Sahay

Soni

2019

J of Applied Polymer Sci

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The adsorption of proteins onto polymeric surfaces is encountered in many natural and industrial processes and is a prerequisite to their efficient identification, separation, and purification by methods such as chromatography, and filtration. Nevertheless, the exact nature of the adsorption mechanisms and interfacial interactions is not easy to identify for a given protein-polymer system. Here, we aim to document the adsorption mechanism of a protein-polymer system by investigating the adsorption as well as desorption phenomenon of a protein [bovine serum albumin (BSA)] from the polymeric surface [polyethersulfone (PES)]. The analyses performed to document the adsorption mechanism of the BSA-PES system include scanning electron microscope (SEM), attenuated total reflection-Fourier transform infrared (FTIR), contact angle, zeta potential, surface charge density measurement, and Derjaguin-Landau-Verwey-Overbeek (DLVO). Here, SEM and FTIR identified the physical and chemical properties of pure PES and PES-BSA membranes. The low water contact angle of the PES-BSA membrane confirms its applicability for tissue engineering applications. Further, the zeta potential, surface charge density measurement, and DLVO analyses were performed to document the adsorption mechanism. The adsorption of BSA particles on the PES surface was carried out for pH values that ranged from 4 to 10 for contact times that ranged from 1 to 3 days. A monotonic increase in the zeta potential of the PES-BSA system indicated considerable adsorption of BSA particles on the PES surface. Further, BSA adsorption was very strong for pH values greater than 4.7 which confirms to strong electrostatic interactions between BSA and PES. The strong electrostatic interaction is also collaborated by low desorption rate, which was only 22% for pH 10 after 3 days of contact.

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“…The results for the kinetic models are then reported in Figure and Table . The linear form of kinetics models can be expressed as follows:

\ln ((), q_{e} - q_{t}) = \ln ((), q_{e}) - k_{1} t

\frac{t}{q_{t}} = \frac{1}{k_{2} q_{e}^{2}} + \frac{t}{q_{e}}

q_{t} = k_{p} \times \sqrt{t} + c

Section: Resultsmentioning

confidence: 99%

Protein–polymer interaction: Transfer loading at interfacial region of PES‐based membrane and BSA

Sadegh

Sahay

Soni

2019

J of Applied Polymer Sci

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“…55 Since CNTs were discovered in 1991 by Iijima, 56 a variety of them have become available, such as single, double, few, and multi-walled carbon nanotubes. [57][58][59][60] Carbon nanotubes (CNTs) have been intensively studied as a potential material to be used in a variety of applications based on their unusual chemical and physical properties. 61 Compared with adsorbents such as clay and activated carbon, CNTs are more attractive because of their high selectivity, structural diversity and favorable physicochemical stability.…”

Section: Introductionmentioning

confidence: 99%

Removal of dye molecules from aqueous solution by carbon nanotubes and carbon nanotube functional groups: critical review

2017

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“…In kinetic studies, the equation of the pseudo‐second‐order model, presented by Ho in 1995, is expressed in the following equation, which shows how the pertained rate of adsorption is related to the equilibrium amount:

\frac{d q_{t}}{dt} = k {(q_{e} - q_{t})}^{2}

where k is the intraparticle diffusion constant rate (mg g −1 min −1/2 ).…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic and kinetic studies of crystal violet dye adsorption with poly(methyl methacrylate)–graphene oxide and poly(methyl methacrylate)–graphene oxide–zinc oxide nanocomposites

Rajabi

Mahanpoor

Moradi

2019

J of Applied Polymer Sci

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We successfully prepared poly(methyl methacrylate) (PMMA)–graphene oxide (GO) and PMMA–GO–zinc oxide (ZnO) nanocomposites and characterized them using different techniques. The adsorption performances of the as‐prepared composites were investigated for crystal violet (CV) dye removal. The contact time as a main factor affecting the adsorption process by adsorbents was studied. Because the adsorption capacity value for CV was found to show no extensive changes after 35 min, 35 min was selected as the best contact time for our system. The adsorption results revealed that the best capacity of CV adsorption onto the PMMA–GO and PMMA–GO–ZnO nanocomposites occurred at pH 12 and 298 K. The respective entropies (−0.208 and −0.168 kJ mol−1 K−1) and enthalpies (−72.86 kJ/mol, and −55.54 kJ/mol) for PMMA–GO and PMMA–GO–ZnO and Gibbs energy revealed that the process of adsorption was exothermic. In addition, the Elovich, pseudo‐first‐order, intraparticle diffusion, and pseudo‐second‐order (four types) models were applied to our kinetic study. Our results indicate that CV adsorption onto PMMA–GO and PMMA–GO–ZnO was good with the pseudo‐second‐order (type 1) and pseudo‐first‐order models because of the low χ2 value and the high correlation coefficient value. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47495.

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Effect of electrostatic interaction on the methylene blue and methyl orange adsorption by the pristine and functionalized carbon nanotubes

Cited by 73 publications

References 39 publications

Protein–polymer interaction: Transfer loading at interfacial region of PES‐based membrane and BSA

Protein–polymer interaction: Transfer loading at interfacial region of PES‐based membrane and BSA

Removal of dye molecules from aqueous solution by carbon nanotubes and carbon nanotube functional groups: critical review

Thermodynamic and kinetic studies of crystal violet dye adsorption with poly(methyl methacrylate)–graphene oxide and poly(methyl methacrylate)–graphene oxide–zinc oxide nanocomposites

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