Ranjhan Junejo - National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro-۷۶۰۸۰, Pakistan
Shahabuddin Memon - National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro-۷۶۰۸۰, Pakistan
Fatih Durmaz - Department of Chemistry, Selcuk University, Konya ۴۲۰۷۵, Turkey
Ayaz Ali Ahmed - National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro-۷۶۰۸۰, Pakistan
Fakhar Nisa Memon - Department of Chemistry, University of Karachi, Karachi-۷۵۲۷۰, Pakistan
Nida Shams Jalbani - National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro-۷۶۰۸۰, Pakistan
Safia Sanam Memon - National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro-۷۶۰۸۰, Pakistan
Asif Ali Bhatti - Department of Chemistry, Government College University Hyderabad, Hyderabad ۷۱۰۰۰, Pakistan

Toxic metal pollution is one of the most persistent environmental problems globally. This study deals with the synthesis of the p -piperdinomethyl calix[4]arene attached silica (PAS) resin and to investigate their metal ions removal efficiency from water. In batch adsorption experiment PAS resin shows good adsorption efficacy for the Cu2+ and Pb2+ metal ions. To examine the adsorption mechanism and validate the experimental adsorption data the isotherm models were applied and adsorption of the Cu2+ and Pb2+ metal ions follow Freundlich isotherm model very well with good correlation coefficient. However, the adsorption energy calculated from the D-R isotherm was at the range of 9-14 KJ/mole which describes the ion exchange nature of resin. Furthermore, breakthrough capacity of column was calculated from online adsorption as 0.027 and 0.041 mmol/g-1 for Cu2+ and Pb2+, respectively. Furthermore, thermodynamics and kinetic study revealed that, the adsorption process spontaneity and endothermic that follows the pseudo 2nd order kinetic equation with good regression coefficient.

Batch Adsorption, Toxic metal ions, Calix[4]arene, Online adsorption