Nanoporous hypercrosslinked polyaniline: An efficient adsorbent for the adsorptive removal of cationic and anionic dyes

Abstract

Nanoporous hypercrosslinked polyaniline (HCPANI) with specific surface area of 1083m2g−1 was used as an efficient adsorbent to remove both cationic (crystal violet, CV) and anionic (methyl orange, MO) dyes in the aqueous solution. Both the dyes could be removed as early as in 60min with the adsorption capacity that reaches up to 245 and 220mgg−1 for CV and MO, respectively. Both the dyes obey pseudo second order kinetics and Langmuir adsorption isotherm model. The mechanism for the adsorption of both cationic and anionic organic dyes by the HCPANI has been proposed. Furthermore, the thermodynamic studies revealed that adsorption of organic dyes is a spontaneous exothermic process with negative ∆G and ∆H values.