Fabrication of Polyethersulfone/Functionalized MWCNTs Nanocomposite and Investigation its Efficiency as an Adsorbent of Pb(II) Ions

Autor: Hamid Ebrahimi, Milad Jamshidian, Ismaeil Ghasemi, Iraj Rezaeian, Bahareh Sadeghalvad
Rok vydání: 2020
Předmět:
Zdroj: Arabian Journal for Science and Engineering. 46:6259-6273
ISSN: 2191-4281
2193-567X
DOI: 10.1007/s13369-020-04991-9
Popis: The novel polyethersulfone/ethylenediamine-functionalized multiwall carbon nanotubes (PES/MWCNTs-NH2) nanocomposite was synthesized and introduced as an efficient adsorbent for Pb(II) removal from aqueous solutions. The characterization analyses, including FTIR, TGA, SEM, and EDX, confirmed the successful functionalization of MWCNTs through three steps acidic treatment, acylation with SOCL2, and amine functionalization. The influence of MWCNTs functionalization, pH, stirring speed, contact time, and adsorbent dosage on the Pb(II) adsorption by PES/MWCNTs-NH2 nanocomposite was investigated. The optimum condition was obtained on neutral pH, contact time 10 min, stirring speed 400 rpm, and adsorbent dosage 0.1 g of PES/1% MWCNTs-NH2, which reached the maximum adsorption capacity of 272 mg/g. The equilibrium studies were investigated by consideration of Langmuir, Freundlich, Temkin, and D-R isotherm models, which revealed that Pb(II) adsorption onto PES/MWCNTs-NH2 was performed on a heterogeneous surface with a non-uniform distribution of heat of adsorption. Also, it confirmed that the chemisorption process was favorable. The kinetic studies through pseudo-first-order, pseudo-second-order (as a reaction-based model), and Boyd models (diffusion-based model) showed that the chemisorption adsorption rate was fast, and controlled by film diffusion. Thermodynamic studies indicated that Pb(II) adsorption process onto PES/MWCNTs-NH2 was spontaneous, endothermic, by increasing the randomness of the solid/liquid interface.
Databáze: OpenAIRE
Externí odkaz: