Adsorption of Cd(II) ions onto polyamine-polyurea polymer modified with pyromellitic dianhydride

Abstract

In this study, polyamine-polyurea polymer was synthesized using toluendiisocyanate and polyethyleneimine. It was then modified using pyromellitic dianhydride. The polymer so obtained (PMPPP) was used for the adsorption of Cd(II) metal ions from aqueous solutions using a batch adsorption system to simulate the adsorption characteristics of wastewater applications. The effects of pH, dosage, contact time, initial concentration, and temperature were investigated. The optimum pH value was found to be 6.0, and the contact time required to reach equilibrium was 120 min. The Cd(II) adsorption equilibrium data were found to be more in line with the Langmuir equation than the Freundlich model. The maximum adsorption capacity of PMPPP for Cd(II) was calculated to be 94.3 mg g -1 . Kinetics studies showed that Cd(II) adsorption followed the pseudo-second-order equation. Thermodynamic investigations revealed endothermicity, spontaneity, and an increased randomness of Cd(II) adsorption onto PMPPP. Polymer was characterized by Fourier transform infrared spectroscopy, thermogravimetric-differential thermal analysis, scanning electron microscopy, and nitrogen adsorption/desorption isotherms.

Adsorption of Cu(II), Ni(II) and Pb(II) ions onto polyamine-polyurea polymer modified with pyromellitic dianhydride: kinetic, isotherm and thermodynamic studies

“…Then, PPP was modified with PMDA in DMF by mechanical stirring at 50˚C. The obtained material was neutralised with dilute NaOH solution [24].…”

“…Adsorption of some metal ions using polyamine-polyurea resin has been reported in the literature [23]. To increase the adsorption capacity of the polyamine-polyurea polymer, it was modified with pyromellitic dianhydride (PMDA) and used to remove Cd(II) ions from aqueous solutions [24]. The good adsorption performance of the resin for Cd(II) ions prompted us to investigate the adsorption of other metal ions such as Cu(II), Ni(II), and Pb(II).…”

Column Solid Phase Extraction of Ni(II) and Cu(II) Using Salicylaldehyde-Modified Polyamine Polyurea Resin for Their Determination by FAAS in Waters

“…According to elemental analysis results, the C, H, and N content of polyamine polymer given in a previous study was 53.25, 7.58, and 21.10%, respectively (39). In this study, it was determined that salicylaldehyde-modified polyamine polyurea resin has C: 53.63%, H: 6.06%.…”

“…The synthesis of polyamine polyurea polymer (PPP) is described in a previous study (39). The following procedure was applied to modify PPP with salicyl-aldehyde.…”

Zn(II) İyonlarının Piromellitik Dianhidrit ile Modifiye Edilmiş Poliamin Poliüre Polimeri ile Adsorpsiyonu

“…Bu çalışmada daha önce hazırlanarak çeşitli metal iyonlarının adsorpsiyonunda kullanılmış ve etkili adsorplama kapasitesi sergilemiş olan piromellitik dianhidrit ile modifiye edilmiş poliamin-poliüre reçinesi [10], [22] Birim adsorban başına adsorplanan Zn(II) miktarı aşağıdaki denklem ile hesaplanmıştır.…”