Modelling of dye adsorption from aqueous solution on polyaniline/carboxymethyl cellulose/TiO2 nanocomposites

Marjan Tanzifi; Mohammad Tavakkoli Yaraki; Mojtaba Karami; Samira Karimi; Asieh Dehghani Kiadehi; Kianoush Karimipour; Shaobin Wang

doi:10.1016/j.jcis.2018.02.059

Modelling of dye adsorption from aqueous solution on polyaniline/carboxymethyl cellulose/TiO₂ nanocomposites

J Colloid Interface Sci. 2018 Jun 1:519:154-173. doi: 10.1016/j.jcis.2018.02.059. Epub 2018 Feb 21.

Authors

Marjan Tanzifi¹, Mohammad Tavakkoli Yaraki², Mojtaba Karami³, Samira Karimi⁴, Asieh Dehghani Kiadehi⁵, Kianoush Karimipour⁶, Shaobin Wang⁷

Affiliations

¹ Department of Chemical Engineering, Faculty of Engineering, University of Ilam, Ilam, Iran. Electronic address: m.tanzifi@ilam.ac.ir.
² Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran 15875-4413, Iran; Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive, Singapore 117585, Singapore(1). Electronic address: m.tavakkoliyaraki@u.nus.edu.
³ Department of Computer and Information Technology, Ilam University, Ilam, Iran.
⁴ Department of Mechanic of Biosystems Engineering, Tarbiat Modares University, Tehran, Iran.
⁵ Department of Chemical Engineering, Faculty of Engineering, Babol Noshirvani University of Technology, Babol, Iran.
⁶ Department of Chemical Engineering, Faculty of Engineering, University of Ilam, Ilam, Iran.
⁷ Department of Chemical Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, Australia. Electronic address: shaobin.wang@curtin.edu.au.

PMID: 29494878
DOI: 10.1016/j.jcis.2018.02.059

Abstract

In the present study, a polyaniline/carboxymethyl cellulose/TiO₂ nanocomposite (PAn/CMC/TiO₂) was synthesized by a polymerization method, and was used for adsorption of Congo Red from aqueous solution. The effects of operational parameters of the adsorption process including pH, initial dye concentration, temperature, adsorbent dosage, and adsorption time on adsorption efficiency were investigated, and response surface methodology was used for their optimization. Optimal adsorption conditions were determined at pH of 2.6, initial concentration of 82mgL, temperature of 56 °C, adsorption time of 24 min, and adsorbent dose of 0.14 g. In addition, the system was also simulated using artificial neural network (ANN) and genetic programming (GP). It was found that the behavior of the system could be well predicted by ANN using 5, 1 and 8 neurons for input, middle and output layers, respectively. Kinetic and isothermal analyses showed that the maximum adsorption capacities were obtained at 94.28, 97.53 and 119.9 mgg by Langmuir model at temperatures of 25, 40 and 50 °C, respectively and that adsorption kinetics followed the pseudo-second-order model. The nano-adsorbent was also found to be reusable without a significant change in adsorption capacity for at least five adsorption-desorption cycles. Finally, the mechanism of dye adsorption on the nano-adsorbent was investigated and proposed.

Keywords: Adsorption; Carboxymethyl cellulose sodium; Congo Red; Optimization; Polyaniline; TiO(2).