Evaluation of conductive polymers as an adsorbent for eradication of As (III) from aqueous solution using inductively coupled plasma optical emission spectroscopy (ICP-OES)

Abstract

The main focused of this research work is the preparation of conductive polymers like polypyrrole, polyaniline and polythiophene and their application as adsorbent materials for the removal of hyper toxic metal As (III) from aqueous solution. The metal ions get attached on the π-electrons at the back bone of polymer that illustrate excellent affinity for metal ions. The adsorption of As (II) ions was carried out on polythiophene due to its redox properties and the stronger interaction between sulfur atoms with arsenic atoms. To attain large surface area and for maximum interaction of As (III) ions with polymers, the particle size of polymers was ranged in nano scale. As the surface area increases with decrease in particle size, the active sites for metal ions also increases. These polymers were characterized by FIIR spectroscopy and SEM analysis. Adsorption isothermal data was examined by two parameters (Langmuir, Freundlich, and Dubinin-Radushkevich) and three parameters Redlich-Petrson, Sips and Toth models. Experimental results showed that based on standard deviation (SD) and Chi square test (χ 2 ) the experimental data was best explained by Freundlich and Toth isotherm. Thermodynamics parameters such as free energy change (ΔG 0 ), enthalpy change (ΔH 0 ) and entropy change (ΔS 0 ) have been calculated respectively, which revealed the spontaneous, endothermic and feasible nature of adsorption process.

Conducting Polymers in the Fields of Energy, Environmental Remediation, and Chemical–Chiral Sensors

“…627 Polythiophene is a useful adsorbent material for the removal of toxic As(III), because these ions become attached to the π-electrons at the backbone of the polymer, resulting in a strong interaction between the S and As atoms. 628 Lastly, the combined sorptional−photocatalytic remediation of dyes can be achieved by PANi−Zr(IV) nanocomposites. 629 The participation of CPs in photocatalysis is further discussed below.…”

Conductive Polymers and Their Nanocomposites as Adsorbents in Environmental Applications

“…Furthermore, it was reported by [142] that Cd (II) can be efficiently removed by polythiophene nanocomposites. Likewise, the use of polythiophene as an adsorbent material was reported by [143] for the removal of toxic As (III). In the reported adsorption process, the As ions become attached to π electrons at the backbone of the polymer, leading to much stronger interactions between S and As atoms.…”

Advances in organic–inorganic hybrid sorbents for the extraction of organic and inorganic pollutants in different types of food and environmental samples

“…In this case, the substrate used was silica‐conductive polymer (SiO 2 ‐PDPA) that enhanced the properties of nanoparticles which basically render high surface area‐to‐volume ratio resulting in great extraction capacity and efficiency. The attachment of Ag nanoparticles on the π‐electrons at the back bone of polymer, SiO 2 ‐PDPA was able to offer excellent affinity, higher specific surface area, and increment in loading capacity . In addition, the excellent adsorption interactions involved between Ag‐SiO 2 ‐PDPA and pesticides were dipole–dipole and van der Waals forces.…”