Preparation of poly(vinylalcohol)/poly(acrylamide-co-vinyl imidazole)/γ-Fe₂O₃semi-IPN nanocomposite and their application for removal of heavy metal ions from water

Abstract

A series of magnetic semi-interpenetrating polymer network (semi-IPN) hydrogels was prepared in one-stage strategy composed of linear poly(vinyl alcohol) (PVA) chains and magnetic γ-Fe 2 O 3 nanoparticles entrapped within the cross-linked poly(acrylamide-co-vinylimidazole) (poly(AAm-co-VI)) network. The influence of PVA, weight ratio of AAm:VI, γ-Fe 2 O 3 , and MBA on the swelling properties of the obtained nanocomposite hydrogels was evaluated. The prepared magnetic semi-IPN hydrogels were fully characterized and used as absorbent for removal of Pb(II) and Cd(II) from water. Factors that influence the metal ion adsorption such as solution pH, contact time, initial metal ion concentration, and temperature were studied in details. The experimental results were reliably described by Langmuir adsorption isotherms. The adsorption capacity of semi-IPN nanocomposite for Pb(II) and Cd(II) were175.80 and 149.76 mg g À1 , respectively. The kinetic experimental data indicated that the chemical sorption is the ratedetermining step. According to thermodynamic studies, Pb(II) and Cd(II) adsorption on the hydrogels was endothermic and also chemical in nature. The prepared magnetic PVA/poly(AAm-co-VI) semi-IPN hydrogels could be employed as efficient and low-cost adsorbents of heavy metal ions from water.

Efficient removal of hexavalent chromium and lead from aqueous solutions by s‐triazine containing nanoporous polyamide

“…1B). In 1 H-NMR and 13 C-NMR spectra of diacid monomer, a broad s peak around 12.73 p.p.m. related to carboxylic acid protons appeared.…”

“…The most effective adsorbents for adsorption process are functionalized polymeric materials because metal ions can be chemically bonded by the functional groups of the polymer . These kinds of materials often present the best properties of each of its components in a synergic way and have high performances of physical, chemical, and mechanical properties . In the functionalized polymeric materials, aromatic polyamides (PAs) are well known as high‐performance polymers because of their combination of excellent thermal, mechanical, and chemical properties that make them useful in applications for advanced technologies .…”

“…[8][9][10] These kinds of materials often present the best properties of each of its components in a synergic way and have high performances of physical, chemical, and mechanical properties. [10][11][12][13][14][15] In the functionalized polymeric materials, aromatic polyamides (PAs) are well known as high-performance polymers because of their combination of excellent thermal, mechanical, and chemical properties that make them useful in applications for advanced technologies. [16][17][18] But because of the low solubility and flexibility of PAs, ether and sulfur groups were added to the structure of their monomers.…”

Water-Soluble and Insoluble Polymers, Nanoparticles, Nanocomposites and Hybrids With Ability to Remove Hazardous Inorganic Pollutants in Water

“…Magnetic separation is one of the promising methods for an environmental purification technique, and hence, the incorporation of magnetic iron oxide leads to adsorbents with the capability to be separated from the mixture using magnetic forces. In this way, several polymer matrices including synthetic and biopolymers have included magnetic iron oxide for the removal of Pb(II), Cd(II), Hg(II), Cu(II), Ni(II), and Co(II) (Zhou et al, 2009 ; Monier et al, 2010 ; Fan et al, 2013 ; Sekhavat Pour and Ghaemy, 2016 ). Oxyanion contaminants such as arsenate, arsenite, chromate, and vanadate, among others, adsorb onto metal (hydr)oxide surfaces forming stable monodentate or bidentate inner-sphere complexes via ligand exchange with OH − or OH 2 groups (Hristovski and Markovski, 2017 ).…”

Preparation of thermal/pH‐sensitive semi‐interpenetrating network hydrogels from quaternary chitosan via an amino‐anhydride click reaction for efficient dye removal from aqueous solutions

“…Batch adsorption experiments showed that low‐cost hydrogel adsorbents can adsorb effectively heavy metal ions. [ 30 ] Wang et al prepared novel semi‐IPN hydrogels via a one‐step in situ approach from chitosan, acrylic acid, gelatin, and a crosslinker. Their adsorption properties were explored using Cu 2+ as a model ion.…”