Adsorption mechanism of functionalized multi-walled carbon nanotubes for advanced Cu (II) removal

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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“…Further, energies of the active sites are distributed exponentially. The nonlinear form of this model is given as:

q_{e} = K_{F} . C_{e}^{1 / n}

…”

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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“…Among all types of MWCNTs, the as-received MWCNT had the lowest kinetic rate. The pseudo-second-order kinetic model can be expressed as follows [40]:…”

Section: Adsorption Kineticmentioning

confidence: 99%

“…An adsorption capacity of 110 mg/g for lincomycine (LCN) was reported by Kim et al [56] for the SWCNT. Treated MWCNTs with HNO 3 [40], or NaClO [36], or carboxylation [37] were also effective for the removal of Cu (II) (108 mg/g), ciprofloxacin (175 mg/g) and linear alkyl benzene sulfonates (160 mg/g) respectively.…”

Section: Comparison Of Ace Removal In This Studies and Previous Studiesmentioning

confidence: 99%

Enhanced removal of acetaminophen from synthetic wastewater using multi-walled carbon nanotubes (MWCNTs) chemically modified with NaOH, HNO3/H2SO4, ozone, and/or chitosan

Lin

Kurniawan

Albadarin

et al. 2018

Journal of Molecular Liquids

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This study investigates the technical feasibility of MWCNTs for acetaminophen (Ace) removal from synthetic wastewater in batch mode. To improve their removal performance, the surface of the MWCNTs was chemically modified with NaOH, HNO 3 /H 2 SO 4 , ozone and/or chitosan. The effects of pertinent parameters such as reaction time, dose, pH, and agitation speed on the Ace removal were evaluated. Their removal performance on Ace was compared to those of previous studies. The adsorption mechanisms of Ace removal by the MWCNTs are also presented. It is evident from this study that after chemical modification on its surface, the treated nano-adsorbent significantly enhanced Ace removal from wastewater. Among all types of those adsorbents, the ozone-treated MWCNT stands out for the highest Ace removal (95%) under the same initial Ace concentration of 10 mg/L. Their adsorption capacities, applicable to the Freundlich isotherm model, are listed as: ozone-treated MWCNT (250 mg/g) > chitosan-coated MWCNT (205 mg/g) > acid-treated MWCNT (160 mg/g) > NaOH-treated MWCNT (130 mg/g) > as-received MWCNT (90 mg/g). Although the ozone-treated MWCNT has the most outstanding performance in Ace removal, its treated effluent still could not meet the required effluent limit of less than 0.2 mg/L set by China's legislation. This suggests that further treatment using biological processes needs to be carried out to complement Ace removal from the wastewater samples.

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“…4 from water over the past two decades. Various nanosized adsorbents including magnetic iron oxide nanoparticles, [7,8] carbon nanotubes (CNTs), [9,10] graphene oxide nanosheets, [11] hydroxyapatite nanoparticles, [12] and titanate nanotubes, [13,14] have been selected as novel adsorbents for effective removal of heavy metal ions.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Magnetic nickel chrysotile nanotubes tethered with pH-sensitive poly(methacrylic acid) brushes for Cu(II) adsorption

Jiang

Yuan²,

Cai

et al. 2019

Journal of Molecular Liquids

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Adsorption mechanism of functionalized multi-walled carbon nanotubes for advanced Cu (II) removal

Cited by 107 publications

References 54 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

Enhanced removal of acetaminophen from synthetic wastewater using multi-walled carbon nanotubes (MWCNTs) chemically modified with NaOH, HNO3/H2SO4, ozone, and/or chitosan

Magnetic nickel chrysotile nanotubes tethered with pH-sensitive poly(methacrylic acid) brushes for Cu(II) adsorption

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