MWCNTs-Fe3O4 nanocomposite for Hg(II) high adsorption efficiency

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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“…With increasing temperature of the CV solution from 293 to 308 K, at equilibrium time, CV removal by the PMMA–GO and PMMA–GO–ZnO nanocomposites decreased (Figure ). This behavior indicated that CV adsorption onto the PMMA–GO and PMMA–GO–ZnO nanocomposites was an exothermic process …”

Section: Resultsmentioning

confidence: 95%

“…At a lower concentration of adsorbent, the active site number was higher. With increasing adsorbent dosage, particles aggregation occurred; as a result, the efficiency and CV removal decreased …”

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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“…High toxicity and the degradation of these ions in the environment is hazardous to human beings and human health . HMIs in natural waters can exert a lot of side effects on living organisms in various ways, including food and food chain . This kind of pollution has become an epidemic problem so the removal of HMIs is a major issue in world …”

Section: Introductionmentioning

confidence: 99%

Recent Progress in the Removal of Heavy Metal Ions from Water Using Metal‐Organic Frameworks

2020

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The efficient adsorption of heavy metal ions from wastewater has become a serious challenge from both environmental and biological viewpoints. Recently, porous metal‐organic frameworks (MOFs), with metallic clusters and organic linkers, have been developed as promising structures in the capture of different toxic and hazardous substances, including heavy metal ions, because of their unique features. Here there is a collection for recent progress in the field of water remediation from the variable‐valent metals in polluted water and the corresponding MOFs which are able to remove these pollutant agents from water. Meanwhile, effective factors in the absorption of metal ions are discussed. MOFs are considered to be a promising candidate for metal ions removal from wastewater.

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MWCNTs-Fe3O4 nanocomposite for Hg(II) high adsorption efficiency

Cited by 151 publications

References 74 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

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

Recent Progress in the Removal of Heavy Metal Ions from Water Using Metal‐Organic Frameworks

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