ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Selective removal of lead (II) ions and estimation of Ca (II) ions using poly-o-toluidine–zirconium (IV) molybdophosphate

Rupinder Kaur, Sandeep Kaushal, and Prit Pal Singh

Guru Nanak Dev Polytechnic College, Ludhiana, India

E-mail: kaushalsandeep33@gmail.com

Abstract: A new composite cation exchange material poly-o-toluidine–zirconium (IV) molybdophosphate (PTD–ZrMoP) was synthesized by sol–gel method through the incorporation of inorganic gel of zirconium(IV) molybdophosphate in the organic polymer poly-o-toluidine. The PTD–ZrMoP was characterized by FTIR, FESEM, HRTEM, XRD and TGA/DTA techniques. Elution behavior, thermal stability, pH titrations, chemical stability, distribution studies and quantitative separation of metal ions in binary synthetic mixtures and real life samples on nanocomposite ion exchanger were also investigated. The ion-exchange capacity of the nanocomposite ion exchanger (0.84 meq/g) has been observed to be higher compared to that of its inorganic counterpart (0.49 meq/g). The nanocomposite was found to be thermally stable and retained 71.43% of its ion-exchange capacity up to 300 °C temperature. The environmental applicability of the PTD–ZrMoP nanocomposite was explored by achieving binary separations and selective separation of Pb²⁺ from synthetic mixtures of metal ions. The analytical utility of nanocomposite ion exchanger has been established by the separation of harmful Pb²⁺ ions from waste water samples obtained from paint industry, textile industry and lead storage battery unit, and by the quantitative estimation of Ca²⁺ ions in a commercially available pharmaceutical formula.

Keywords: Organic–inorganic composite material ; Poly-o-toluidine–Zr (IV) molybdophosphate ; Nanocomposite ; Separation of metal ions 

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-019-00763-4

Chemical Papers 73 (8) 2027–2039 (2019)