Adsorption Characteristics of Copper (II) Ions from Aqueous Solution onto Ionic Cross-linked Pva/P(Aam-Nipaam) Core-shell Nanogels

Abstract

Core-shell nanogels adsorbent were investigated for copper (II) removal from aqueous solution, consisting of poly(vinyl alcohol) (PVA) core and poly(acrylamide-N-isopropylacrylamide/) p(AAm-NIPAm) shell particles. Various factors affecting the adsorption capacity, such as swelling, pH, time, initial ion concentration, and different metal ions on the metal ion binding capacity for nanogel, was also tested. The selectivity of the nanogels toward the different metal ions tested was Cu 2+ > N i2+ > Pb 2+ . The results show that the adsorption of nanogels mainly depends on pH, and the maximum adsorption was obtained at a pH of 6.0. The adsorption capacity of Cu +2 was 126 mg/g obtained under simple and fast experimental conditions, the effect of different mole ratios of p(AAm-NIPAm) shells thickness were synthesized, to determine the maximum metal uptake. The core-shell nanogels were characterized by fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and transmission electron microscope (TEM). It was found that adsorbed Cu +2 ions on PVA/p(AAm-NIPAm) nanogels can be effectively desorbed by acid stripping with 0.1 mol/L HCl resulted in 96% Cu +2 recovery for the nanogels; this shows the ability of the nanogels to be reused, upon drying between treatments. The nanogels adsorbent can be regenerated after releasing of Cu +2 and reused three times effectively. All the experimental result exhibited good matches with the Freundlich isotherm and followed pseudo-second-order kinetics. The mechanism of adsorption of Cu +2 onto PVA/p(AAm-NIPAm) nanogels is proposed.

The Synthesis of Carboxymethyl Cellulose‐Based Hydrogel from Sugarcane Bagasse Using Microwave‐Assisted Irradiation for Selective Adsorption of Copper(II) Ions

“…Therefore, the CMC‐based hydrogel with 25% CMC can enhance the selectivity of Cu(II) ion adsorption. In addition, the initial concentrations of heavy metal ions play an important role in the amount of the ions adsorbed by an adsorbent . Therefore, the adsorption capacities for metal ions reported in this work were relatively low compared with the previous works presented in Table , because the initial concentration was only 50 mg/L.…”

“…Due to the adsorption behavior, a hydrogel with the property of selective adsorption has been developed to be an effective and economic tool that can be used as an alternative technique for heavy metal separation and removal from wastewater and other water resources . The hydrogel not only removes metal ions from water, but it also separates and purifies the adsorbed metal ions from other matrices .…”

Removal of Selective Metal Ions from Water with Hydroxy Propyl Cellulose Hydrogel

“…Lowest swelling ratio of hydrogel in same pH environment was observed at higher surfactant concentration (12 mM). These observations are explained as the surfactant when present as monomer facilitates the cross-linking network of hydrogel due to destabilization effect occurred because of the electrostatic repulsion between negative charge of polymer chain and SDS monomers, thus leading to the expansion and mixed micelle formation in the system [4]. But at higher concentration i.e.…”

“…It has been recognized that hydrogels are promising materials for the removal of heavy metal ions [2] after facilitating incorporation of different chelating groups into the polymeric network [3]. It is a fact that charged hydrogels which are functionalized by carboxylic acid, amine, hydroxyls or sulphonic acid groups can form complexes as good polychelatogens [4] with toxic metal ions of Cd, Pd, Cu, Hg, etc. so as to remove from the aqueous solutions [5].…”

Aluminum oxyhydroxide-doped PMMA hybrids powder prepared via facile one-pot method towards copper ion removal from aqueous solution

“…Copper has been identified as a contaminant due to its prevalent existence and toxic effect upon the environment. It catalyzes the development of highly reactive oxygen species, which leads to lipid peroxidation and the lack of the compact form of glutathione which rises the methemoglobin content [5]. Additional Cu +2 in the human body has been related to severe health problems such as cellular or main organ disease [6].…”