Removal of Cu²⁺ and Pb²⁺ ions by N‐vinyl 2‐pyrrolidone/itaconic acid hydrogels from aqueous solutions

Abstract

In this study, a series of crosslinked N‐vinyl‐2‐pyrrolidone–itaconic acid (NVP‐IA) hydrogels was prepared by free radical polymerisation in aqueous solution. Swelling, mechanical and adsorption properties for the removal of Cu2+ and Pb2+ ions from aqueous solutions of these hydrogels were investigated. Metal ion adsorption capacities of hydrogels for Cu2+ and Pb2+ ions were determined as 2.1 and 0.6 mmol g −1, respectively. Adsorption processes of metal ions onto the NVP‐IA hydrogels follow pseudo‐second‐order type adsorption kinetics. The equilibrium adsorption data have been evaluated using Freundlich and Langmuir isotherm models. The results illustrated that the adsorption follows Freundlich isotherm.

A response surface modelling study for sorption of Cu2+, Ni2+, Zn2+ and Cd2+ using chemically modified poly(vinylpyrrolidone) and poly(vinylpyrrolidone-co-methylacrylate) hydrogels

“…The pseudo first-order kinetic model was first suggested by Lagergren for the sorption of solid–liquid systems (Evren et al., 2014). The model is expressed using the equation below.…”

“…The three models applied were pseudo first-order, pseudo second-order and intraparticle diffusion kinetic models. The pseudo first-order kinetic model was first suggested by Lagergren for the sorption of solid-liquid systems (Evren et al, 2014). The model is expressed using the equation below.…”

Fabrication of detonation nanodiamond@sodium alginate hydrogel beads and their performance in sunlight-triggered water release

“…Thus, pseudo-rst and pseudo-second-order kinetic models were used to t the experimental data to evaluate the water adsorption efficiency of the DND@SA hydrogel beads. The models are expressed in the following formulas: 60,61 ln(S e À S t ) ¼ ln S e À K 1 t (3)…”

Synthesis of human hair fiber-impregnated chitosan beads functionalized with citric acid for the adsorption of lysozyme

“…6. These two kinetic models were dened by the following formulas: 52,53 ln(q e À q t ) ¼ ln q e À k 1 t (4)…”