Selective removal of Cr(VI) from aqueous solution by polypyrrole/2,5-diaminobenzene sulfonic acid composite

Nazia H. Kera, Madhumita Bhaumik, Niladri Ballav, Kriveshini Pillay, Suprakas Sinha Ray, Arjun Maity

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

A polypyrrole/2,5-diaminobenzenesulfonic acid (PPy/DABSA) composite, synthesised by the in situ oxidative polymerization of pyrrole in the presence of DABSA, was studied as an adsorbent for the removal of Cr(VI) from aqueous solution. The structure and morphology of the composite were investigated by ATR-FTIR, FE-SEM, EDX, TGA, XRD and XPS studies. The adsorption of Cr(VI) by PPy/DABSA composite was highly pH dependent and optimum removal was achieved at pH 2. Adsorption of Cr(VI) was confirmed by EDX and XPS studies. The isotherm data fitted the linear Langmuir model well, with a maximum adsorption capacity of 303 mg/g at 25 °C. Thermodynamic parameters (δG°, δH° and δS°) were calculated using isotherm data and confirmed that the adsorption process was spontaneous and endothermic. Adsorption kinetics was best described by the pseudo-second-order model. The activation energy of the adsorption process suggested that Cr(VI) was chemisorbed by PPy/DABSA composite. PPy/DABSA composite could be used for three consecutive adsorption-desorption cycles without loss of its original adsorption capacity. Highly selective removal of Cr(VI) was observed even when co-existing ions such as Cu2+, Zn2+, Ni2+, Cl-, SO42- and NO3- were present in the solution. In summary, the potential of PPy/DABSA composite for remediating industrial wastewater contaminated by Cr(VI) has been demonstrated.

Original languageEnglish
Pages (from-to)144-157
Number of pages14
JournalJournal of Colloid and Interface Science
Volume476
DOIs
Publication statusPublished - 15 Aug 2016

Keywords

  • 2,5-Diaminobenzenesulfonic acid
  • Adsorption
  • Composite
  • Equilibrium
  • Hexavalent chromium
  • Isotherms
  • Kinetics
  • Polypyrrole

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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