Enhanced adsorption of aqueous copper(II) ions using dedoped poly-N-phenylglycine nanofibers (original) (raw)
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Egyptian Journal of Chemistry, 2019
N ANORODES, nanosheets, nanospheres and nano-amorphous shape with different particles size of copolymer of anthranilic acid with o-phenylenediamine poly(AA-coo -PD) were synthesized by redox polymerization initiated by FeSO 4 .7H 2 O as redox initiator and ammonium peroxydisulfate (APS) as oxidant in different concentrations of aqueous solutions of hydrochloric acid. The influence of synthetic parameters such as acid concentration and the presence of redox initiator were investigated. The morphology and particles size were studied by transmission electron microscope (TEM) and scanning electron microscope (SEM). The results showed that the morphology and average particle size of polymeric nano particles according to SEM and TEM analyses were different based upon the conditions of the copolymerization. The physico-chemical characterization of the prepared nanoparticles was carried out by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD). Which FT-IR confirmed the structure of poly(AA-coo -PD) nanoparticles in emeraldine form. The molecular weight was determined by gel permeation chromatography (GPC). The surface area of nanocopolymer particles was determined also by Brunauer-Emmett-Teller (BET). The competition of the prepared nano-sized copolymers particles towards the adsorption of copper ions from aqueous solutions was investigated. The results showed that the adsorption capacity was based on particle size of nanocopolymers and their surface area. The adsorption capacity increased with decreasing the particle size. On the other hand the adsorption capacity increased with increasing the surface area of the prepared nano-sized copolymers of poly(AA-coo -PD).
New polymeric structures designed for the removal of Cu(II) ions from aqueous solutions
Journal of Applied Polymer Science, 2007
New polymeric structures obtained by chemical transformations of maleic anhydride/dicyclopentadiene copolymer with triethylenetetraamine, p-aminobenzoic acid, and p-aminophenylacetic acid were used for the removal Cu(II) ions from aqueous solutions. The experimental values prove the importance of the chelator nature and of the macromolecular chain geometry for the retention efficiency. The retention efficiency (Z r ), the retention capacity (Q e ), and the distribution coefficient of the metal ion into the polymer matrix (K d ) are realized by evaluation of residual Cu(II) ions in the effluent waters, by atomic adsorption. Also are discussed the influence of pH, the thermal stability of the polymer, and their polymer-metal complex, as well as the particular aspects regarding the contact procedure and the batch time. Based on the polymers and polymer-metal complexes characterization a potential retention mechanism is proposed. All polymer supports as well theirs metal-complexes are characterized by ATD and FTIR measurements.
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2002
Different metal-complexing ligands carrying synthetic adsorbents have been reported in the literature for heavy metal removal. We have developed a novel and new approach to obtain high metal adsorption capacity utilizing 2-methacrylamidohistidine (MAH) as a metal-complexing ligand. MAH was synthesized by using methacrylochloride and histidine. Spherical beads with an average size of 150-200 mm were obtained by the radical suspension polymerization of MAH and 2-hydroxyethylmethacrylate (HEMA) conducted in an aqueous dispersion medium. Owing to the reasonably rough character of the bead surface, p(HEMA-co-MAH) beads had a specific surface area of 17.6 m 2 g − 1 . Synthesized MAH monomer was characterized by NMR. p(HEMA-co-MAH) beads were characterized by swelling studies, FTIR and elemental analysis. These p(HEMA-co-MAH) affinity beads with a swelling ratio of 65%, and containing 1.6 mmol MAH g − 1 were used in the adsorption/desorption of copper(II) ions from metal solutions. Adsorption equilibria was achieved in 2 h. The maximum adsorption of Cu(II) ions onto pHEMA was 0.36 mg Cu(II) g − 1 . The MAH incorporation significantly increased the Cu(II) adsorption capacity by chelate formation of Cu(II) ions with MAH molecules (122.7 mg Cu(II) g − 1 ), which was observed at pH 7.0. pH significantly affected the adsorption capacity of MAH incorporated beads. The observed adsorption order under non-competitive conditions was Cu(II)\Cr(III)\Hg(II)\Pb(II)\Cd(II) in molar basis. The chelating beads can be easily regenerated by 0.1 M HNO 3 with higher effectiveness. These features make p(HEMA-co-MAH) beads very good candidate for Cu(II) removal at high adsorption capacity.
Modified Poly(ethylene terephthalate) Nano Fibers for Removal of Copper(II) Ions
Journal of Applied Solution Chemistry and Modeling, 2019
In this research, the adsorption of Cu 2+ ions from aqueous solution was investigated by the modified poly (ethylene terephthalate) fibers as a new adsorbent. The best condition of electrospinning was recorded (voltage= 10 kV-distance from nozzle= 12.5 cm-solution convcentration= 0.2 g/mL). The optimum condition for removal of Cu 2+ ions were determined (pH=10-time= 60 min-C= 120 mg/L, qm = 62.4 mg/g). The adsorption data were best fitted by dubinin-radushkevich isotherm and pseudo-second order kinetic models, as well. Structure of the nanofibers were emphasized by scanning electron microscpy (SEM) and thermo gravimetric analysis (TGA).
Removal of Cu(II) from Aqueous Solutions Using Amine-Doped Polyacrylonitrile Fibers
Applied Sciences
Polyacrylonitrile (PAN) fibers were prepared via electrospinning and were modified with diethylenetriamine (DETA) to fabricate surface-modified PAN fibers. The surface-modified PAN fibers were used to evaluate their adsorption capacity for the removal of Cu(II) from aqueous solutions. Batch adsorption experiments were performed to examine the effects of the modification process, initial concentration, initial pH, and adsorbent dose on the adsorption of Cu(II). Kinetic analysis revealed that the experimental data fitted the pseudo-second-order kinetic model better than the pseudo-first-order model. Adsorption equilibrium studies were conducted using the Freundlich and Langmuir isotherm models, and the findings indicated that the PAN fibers modified with 85% DETA presented the highest adsorption capacity for Cu(II) of all analyzed samples. Moreover, the results revealed that the Freundlich model was more appropriate than the Langmuir one for describing the adsorption of Cu(II) onto th...
Journal of the Serbian Chemical Society, 2019
Polymer-based, highly porous nanocomposites with functionalized ligands attached to the core structure are extremely efficient in the detection, removal and recovery of metals through the process of sorption. Quantumchemical models could be helpful for sorption process analyses. The sorption of Cu(II) ions by amino-functionalized chelating macroporous copolymers poly(GMA-co-EGDMA)-amine and sorption selectivity of the subject copolymers, ethylenediamine (en), diethylenetriamine (dien) and triethylenetetramine (trien), were successfully modelled by quantum chemical calculations. Considering the crystal structures from CSD and experimental conditions during the formation of metal complexes, the most frequent mononuclear complexes are those with the tetradentate teta ligand, while binuclear complexes are formed when the metal ion is in large excess. Although the en-copolymer was the most effective functionalized one, higher maximum sorption capacities (Qmax) were observed for the dien-...
Applied Sciences, 2021
The accumulation of plastic waste products in the environment has adversely affected wildlife and human beings. Common plastics that accumulate in the environment are plastics that are made of polyethylene terephthalate (PET) polymer. PET plastic waste products can be recycled for beneficial use, which would reduce their negative impacts. In this study, modified PET or waste PET (WPET) from plastic bottles was blended with powder commercial 2-(aminomethyl)pyridine (SiAMPy) resin and electrospun into composite nanofibres and applied for Cu2+ adsorption. PET-SiAMPy or WPET-SiAMPy composite nanofibres fibre diameters from the HRSEM images were 90–140 nm and 110–155 nm, respectively. In batch adsorption experiments, PET-SiAMPy or WPET-SiAMPy composite nanofibres achieved Cu2+ adsorption equilibrium within 60 secs of contact time with 0.98 mmol/g (89.87%) or 1.24 mmol/g (96.04%) Cu2+ adsorption capacity. The Cu2+ complex formation rate (k) with WPET-SiAMPy was 0.0888 with the mole ratio ...
Adsorption of Toxic Metals on Modified Polyacrylonitrile Nanofibres: A Review
Removal of toxic metals from aqueous solutions is of high priority in environmental chemistry. Most of the available techniques for this task are considered expensive; however, the adsorption process has been considered the easiest and the cheapest way of removing toxic metals from aqueous solution. The performance of adsorption setup largely depends on the characteristic of adsorbents. One of these characteristic is availability of large surface area. The more the available sites for chelation, the more the amount of metals removed. Therefore, the production of materials of nanoscale is expedient for adsorption purposes. Electrospinning process is one of the technologies that have been employed to produce polyacrylonitrile nanofibres (PAN-nfs). Moreover, PAN-nfs surfaces have also been chemically modified so as to introduce chelating groups such as amine, carboxyl, imines, etc. Here we review PAN-nfs as metal ion adsorbent. With characteristics such as high surface area as well as good mechanical strength, modified PAN-nfs are considered good adsorbents and have been used to remove toxic metals such as cadmium, lead, chromium, mercury, uranium, silver and copper in different ion states from their aqueous solutions. The ease of immobilization of metal-specific ligands on PAN-nfs has been of great interest in selective extraction of metal ions from their aqueous solutions. Also, toxic metals adsorbed on modified PAN-nfs can be recovered through desorption process using acids or bases of various concentrations.
Egyptian Journal of Aquatic Biology and Fisheries
Multiwall carbon nanotube-polyethylene glycol and poly vinyl alcohol (MWCNTs-PEG-PVA) nanocomposite hydrogel was fabricated and used for the Cu (II) ions removal from water with high efficiency. The prepared nanocomposite hydrogel was characterized using Scanning electron microscope (SEM), Fourier transform infrared spectroscopy FTIR, X-ray diffraction (XRD), thermogravimetric analyzer TGA and mechanical properties. A series of systematic batch adsorption experiments were conducted to study the adsorption property of MWCNTs-PEG-PVA hydrogels prepared with different concentrations of MWCNTs. Studying the effects of adsorption parameters such as pH, contact time, and initial concentration were evaluated in a batch system. The high adsorption capacity, easy regeneration and effective adsorptiondesorption results proved that the prepared MWCNTs-PEG-PVA composite hydrogel could be an effective adsorbent in removing Cu (II) ion from its aqueous solution. The maximum adsorption capacities were found to be 645.1, 334.4, 238.09 and 185.09 mg g-1 for MWCNTs-PEG-PVA hydrogel with 0.05, 0.10, 0.15, and 0.2 % MWCNTs, respectively at pH 6. Isotherm studies revealed that Langmuir model well described the equilibrium data of Cu (II) compared with Freundlich isotherm model. Kinetics studies of Cu (II) adsorption followed pseudo-second order model. The removal efficiency of the recycled MWCNTs-PEG-PVA hydrogel was 79.3, 76.4, 73.8, 70.1 and 65.5 % for five cycles, which demonstrated efficient reusability.
Analytical Letters, 2011
Polysulfone functionalized with 1-[bis [3-(dimethylamino)-propyl]amino]-2-propanol was electrospun into nanofibers and then employed as a novel platform for the enrichment of Cu(II), Ni(II), and Pb(II) metal ions in aqueous solutions. Parameters affecting adsorption such as fiber diameter, contact time, and pH were investigated. The capacity of the functionalized electrospun fibers to enrich metal ions from various aqueous matrices such as tap water, river water, seawater, treated as well as untreated sewage, was evaluated for spiked samples by inductively coupled plasma optical emission spectroscopy. The equilibrating times for maximum enrichment were 20 min for Cu(II) and Pb(II) respectively and 30 min for Ni(II). Recoveries, in 100 mg L À1 metal ion solutions, ranged from 89.58% (in untreated sewage) to 99.86% for Cu(II) in tap water, 69.70% (in untreated sewage) to 98.64% (in river water) for Ni(II), and from 71.46% (in untreated sewage) to 99.01% (for seawater) for Pb(II). The lowest concentration of metal ions that the functionalized nanofibers could detect in real sample matrices was 0.001 mg L À1 . The metal adsorption kinetics followed a first order rate while the adsorption isotherms best fitted into the Freundlich model. The nanofibers could be regenerated and reused up to five times without a significant deterioration in adsorption and desorption efficiencies. The functionalized electrospun nanofibers present an excellent platform for trace enrichment of metal ions from aqueous solutions at pH values close to that at which the pollutants occur in the environment.