SELECTIVE DECOLORIZATION OF ANIONIC TEXTILE DYE FROM BINARY SOLUTIONS BY ADSORPTION ONTO CHITOSAN-POLYANILINE/Fe3O4 NANOCOMPOSITE

In this study, chitosan-polyaniline/Fe3O4 nanocomposite material (CS-PANI/Fe3O4) was prepared by means of in-situ emulsion polymerization method. The synthesized material was then utilized as an adsorbent for the removal of Reactive blue 198 (RB198) from a single and binary dye system. The effects of pH, contact time, and initial dye concentration on the removal efficiency of the adsorbent were systematically investigated. The obtained results indicated that the adsorption ability toward RB198 of the prepared adsorbent decreased with an increase in the initial dye concentration and pH media. Meanwhile, the removal percentage of dye increased with increasing contact time. Importantly, approximately 92.4% RB198 was removed for an adsorption time of 120 min in single dye system. Adsorption experiment using a binary system of dyes indicated that the removal percentages of RB198 were 72.8% and 94.7% in the RB198-RR198 and RB198-CY mixture, respectively.

Electrochemical Capacitance Properties of Electrode Based on Polyaniline Coated Graphite Nanoplatelets/Polystyrene Composite Film

The electrochemical behavior of the electrode material based on composites of polyaniline (PANI), graphite nanoplatelets (GnP), and polystyrene (PS) matrix was evaluated by applying cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS), for its application in electrochemical supercapacitor which is an advanced energy storing device. Composites were prepared by coating polyaniline on graphite nanoplatelets (PANI/GnP) via in situ emulsion polymerization, exhibiting specific surface area of 178.75 m2/g as compared with 72.1 m2/g of pristine GnP. The PANI/GnP was then embedded in polystyrene matrix (PANI/GnP/PS), which showed improved electrical conductivity due to an interconnected mesh of PANI/GnP as confirmed by scanning electron microscopy (SEM) morphological analysis. The formation of porous conductive network in PANI/GnP/PS with conductivity value of 8.6 × 10−3 S/cm resulted in high specific capacitance of 411.3 F/g measured at a current density of 0.5 A/g which corresponded to specific energy of 47.94 Wh/kg and specific power of 281.94 W/kg, as well as the decrease in specific capacitance was 32% even after 1600 charge–discharge cycles showing good rate performance which renders it an ideal material for electrodes in supercapacitors.

High performance cation exchange membranes synthesized via in situ emulsion polymerization without organic solvents and corrosive acids

This paper demonstrates a new methodology for preparing cation exchange membranes in an effective and environment-friendly way.