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

Abstract

In this study, a polyamine-polyurea polymer modified with pyromellitic dianhydride was used for batch adsorption of Cu(II), Ni(II), and Pb(II) ions to examine the effects of parameters such as pH, contact time, amount of adsorbent, temperature, and initial concentration of heavy metals. The optimum pH value was found to be 6.0 and the contact time required to reach equilibrium was 120 min. Adsorption kinetics, thermodynamics and equilibrium were analysed. The adsorptions of the metal ions were found to comply with the Langmuir isotherm equation and the pseudo-second-order kinetic model. The maximum monolayer adsorption capacity of the modified polymer for Cu(II), Ni(II), and Pb(II) ions was found to be 73.5, 81.3, and 109.9 mg g −1 , respectively. Adsorption mechanism studies of the intraparticle diffusion model showed that surface sorption and intraparticle diffusion contribute to the rate-limiting step. Thermodynamic parameters showed the adsorption processes for all metals with the polymer have an endothermic, irreversible and spontaneous nature.

Polyethyleneimine‐condensed polystyrene resin: A specific adsorbent for Cu2+ over Ni2+

“…The results in Figure 7 and Table 4 indicate that the Cu 2+ adsorption processes by PSFPA conformed to the pseudo‐second‐order kinetic equation. The calculated equilibrium adsorption capacities are in good agreement with the experimental data of 2.08, 2.66, and 2.92, respectively, which are among the best values reported to date for chelating resin materials (vide infra) 29–35 …”

“…The calculated equilibrium adsorption capacities q E are in good agreement with the experimental data of 2.08, 2.66, and 2.92, respectively, which are among the best values reported to date for chelating resin materials (vide infra). [29][30][31][32][33][34][35] The liquid film diffusion Equation (10) 36 and intraparticle diffusion model Equation ( 11) 37 were commonly used to investigate the diffusion mechanism and their diffusion equations are as follows:…”

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

“…Adsorpsiyon ise kolay uygulanabilir olması sebebi ile ağır metal gideriminde en sık kullanılan metotlardan biridir [9], [10]. Metal adsorpsiyon çalışmalarında kullanılmış çok çeşitli doğal ve sentetik adsorbanlar mevcuttur [18]- [20].…”

“…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.…”

Utilization of ladle slag for soil stabilization

“…However, after mixed with the clay, the leaching of Zn and Pb is negligible due to absorption by the clay(Ozer et al 2016;Qu et al 2018;Uddin 2017;Vhahangwele and Mugera 2015;; very low concentrations of Zn (20 and 110 μg/L) are detected in the 14-day 20% and 30% LS-stabilized clay, with 0.02 and 0.11 μg/L…”