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Journal of Polymers and the Environment

, Volume 26, Issue 9, pp 3858–3876 | Cite as

Fabrication of Engineered Silica-Functionalized-Polyanilines Nanocomposites for Water Decontamination of Cadmium and Lead

  • Mohamed E. Mahmoud
  • Nesma A. Fekry
Original Paper
  • 78 Downloads

Abstract

In this study, two novel functionalized silica nanocomposites were synthesized via covalent bonding with nanopolyaniline (NPANI) and crosslinked nanopolyaniline (CrossNPANI) to produce [NSi-NPANI] and [NSi-CrossNPANI], respectively. The two nanocomposites were portrayed by SEM, FT-IR, HR-TEM, BET-surface and TGA. The HR-TEM images of [NSi-NPANI] and [NSi-CrossNPANI] confirmed the particle size in the range 14.28–21.43 and 26.19–35.71 nm, respectively and these two nanocomposites were successfully applied to remove divalent cadmium and lead from solutions. As compared to nanosilica [NSi] sorbent, the maximum capacity values of the two nanocomposites for divalent cadmium and lead were identified to increase from 100–250 µmole g−1 (pH 1.0) to 750–800 µmole g−1 (pH 7.0) and from 400–1050 µmole g−1 (pH 1.0) to 650–1350 µmole g−1 (pH 6.0), at the optimum conditions. The adsorption data were compared using two and three parameter equations based on Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Redlish-Peterson and sips models. The kinetic study of [NSi-NPANI] and [NSi-CrossNPANI] revealed that the pseudo-second order kinetic was the best model to explain the kinetic data for cadmium(II) and lead(II). The free energy of sorption (ΔGo), enthalpy (ΔHo), and entropy (ΔSo) changes were calculated to portend the nature of adsorption. Adsorptive extraction of toxic lead and cadmium from tap water and wastewater was successfully accomplished with the range of percentage recovery values 98.5–100.0 and 91.9–93.0%, respectively.

Keywords

Nanopolyaniline Nanosilica Nanocomposites Kinetic study Adsorption isotherm models Divalent cadmium and lead 

Supplementary material

10924_2018_1263_MOESM1_ESM.docx (102 kb)
Supplementary material 1 (DOCX 102 KB)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Chemistry Department, Faculty of SciencesAlexandria UniversityAlexandriaEgypt

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