Ehsan Nazarzadeh-Zare

A series of acidic ionic liquid (ILs) based on imidazole and pyridine were synthesized and fully characterized by using FTIR, 1H and 13C NMR techniques. The acidic ILs applied as solvent and dopant for polymerization of 3-aminobenzoic acid (3ABA) by using of ammonium persulfate as an initiator. The synthesized P3ABAs-acidic ILs were characterized by FTIR, XRD, SEM, UV-Visible and TG-DTG analysis. The electrical conductivity of P3ABAs samples was measured by four probe method. The P3ABA-[PyCAA][HSO4] (0.30 S/cm) exhibited a higher electrical conductivity than that of the P3ABA-[HPy]HSO4] (0.28 S/cm), P3ABA-[IMBS][Cl] (0.22 S/cm) and bare P3ABA (0.20 S/cm). Based on the SEM micrographs, the acidic ILs changed the morphology of the P3ABA from being completely granular. The XRD patterns of the P3ABAs-acidic ILs samples displayed a more crystalline nature than that of bare P3ABA. The solubility and viscosity of P3ABAs-acidic ILs in polar organic solvents were greater than in bare P3ABA. Moreover, absorption (UV-vis) properties of the synthesized P3ABAs in the presence and absence of acidic ILs were examined. Based on TG-DTG curves, the thermal stability of the P3ABAs-acidic ILs was improved relative to bare P3ABA. The results showed that acidic ILs species form soft templates which assembled 3ABA molecules into specific nanostructures. © 2018 Elsevier B.V.

Novel nano-biosorbent was successfully prepared based on dextrin-g-poly m-phenylenediamine (DgPmPDA) and graphene oxide (GO) by using the solution blending technique and was found to be an effective adsorbent for Pb(II) and methylene blue (MB) dye. The nano-biosorbent was characterized by FTIR, CHN, XRD, SEM, AFM and TGA. The adsorption process depended on the pH of solution, adsorbent dosage, contact time, initial concentration of Pb(II) and MB, and temperature. Experimental results were in good agreement with Langmuir isotherm model for both Pb(II) and MB adsorption. The maximum adsorption capacity (Qmax) of Pb(II) and MB was found to be 80 mg/g and 76.33 mg/g, respectively, at optimum conditions. Results showed that the kinetics of Pb(II) and MB onto the DgPmPDA@GO nano-biosorbent followed the pseudo-first-order and pseudo-second-order models, respectively. Thermodynamic parameters exhibited the endothermic and spontaneous nature of the sorption process. A possible mechanism of adsorption was suggested where π–π stacking interactions, H-bonding interaction and electrostatic attraction controlled the MB adsorption and chelation and electrostatic attraction controlled the Pb(II) adsorption. © 2018 Elsevier Ltd

Poly(aniline-co-pyrrole)@functionalized Fe3O4 (PACP@f-Fe3O4) nanocomposites were prepared by a two-step method. In the first step, the Fe3O4-OH and Fe3O4-NH2 nanoparticles were synthesized by the solvothermal and co-precipitation techniques, respectively. In the second step, the PACP@f-Fe3O4 nanocomposites were synthesized by an in-situ microemulsion polymerization technique. The synthesized materials were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Based on the SEM, the iron oxide changed the morphology of the PACP copolymer from being completely nanospheres. The TGA showed the higher thermal stability of the PACP@Fe3O4-OH nanocomposite in comparison to the PACP@Fe3O4-NH2, and the density functional theory (DFT) successfully confirmed this fact by calculating the binding energies between the PACP copolymer and functionalized nanoparticles. Also, the HOMO − LUMO energy gap (Eg) values were determined by the DFT to investigate the electrical conductivities, which are in accord with the experimental electrical conductivities in the order PACP@Fe3O4-OH > PACP@Fe3O4-NH2 > PACP. © 2018 King Saud University