Harnessing of Newly Tailored Poly (Acrylonitrile)-Starch Nanoparticle Graft Copolymer for Copper Ion Removal via Oximation Reaction (original) (raw)
Related papers
Journal of Applied Polymer Science, 2007
Graft copolymerization of acrylic acid (AA) onto starch was carried out with ceric ammonium nitrate as initiator under nitrogen atmosphere. The grafting percentages (GP%) of starch-graft-acrylic acid (St-g-AA) copolymers were determined. The effect of GP% of St-g-AA copolymers on the competitive removal of Co 2þ , Ni 2þ , Zn 2þ ions from aqueous solution was investigated at different pH (2, 4, 6). The concentrations of each ion in aqueous solution 5 mmol/ L. Effects of various parameters such as treatment time, initial pH of the solution and grafting percentage of starch graft copolymers were investigated. Metal ion removal capacities of St-g-AA copolymers increased with GP% of the copolymers and pH. The results show that the removal of metal ions followed as given in the order Co 2þ > Ni 2þ > Zn 2þ. In this study, metal ion removal capacities were determined by atomic absorption spectrophotometer (AAS).
2015
The untreated heavy metal ions that were discharged as effluent waste had caused serious impact on the environment and human health. The adsorption process is an alternative way to remove heavy metal ions. The polymer-based adsorbent was chosen as material to remove heavy metal ions due to its economic cost, can be prepared with convenient method and excellent capability to make high adsorption towards metal ions. In this study, the synthesis and modification of amidoxime (AO) modified poly(acrylonitrile-co-acrylic acid) (poly(ANco- AA)) was carried out. Next, the effect of adsorption parameters, equilibrium and kinetic studies of cadmium ion (Cd2+) and lead ion (Pb2+) were investigated. The optimisation of adsorption parameter was analysed using Response surface methodology (RSM). The poly(AN-co-AA) was synthesised via redox polymerisation and was further chemically modified with hydroxylamine hydrochloride to produce AO modified poly(AN-co-AA) as adsorbent. Then, single batch syst...
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).
2012
Maleic anhydride-allylpropionate-styrene terpolymer has been modified with triethanolamine and contains carboxylic acid, carbonyl, hydroxyl, ester groups and tret.nitrogen atom, all of which are capable of interacting with metal ions. Modified terpolymer has been used as an adsorbent to remove copper ions from aqueous solution. Effects of contact time, sorbent weight and initial copper (II) concentration on removal efficiency were tested and optimum conditions were evaluated. Langmuir and Freundlich isotherm models were employed to analyse the isotherm behaviours. It was found the equilibrium data were fitted well with Freundlich isotherm model, indicating a chemisorptions process. Langmuir monolayer adsorption capacity of sorbent was examined as 4.09 mmol g-1. Pseudo-first-order and pseudo-second-order models were employed to investigate kinetic behaviours. The kinetic data are best described by pseudo-second-order model. The obtained negative values of ΔG° and ΔH° are indicative o...
Transactions of Nonferrous Metals Society of China, 2015
Poly(p-phenylenediamine)/chitosan (PPPDA/Chi) composite was prepared by in situ chemical oxidative polymerization of p-phenylenediamine (PPPDA) into chitosan (Chi) using ammonium persulphate (APS) as an oxidant. PPPDA and PPPDA/Chi composite were characterized by FT-IR spectra and SEM before and after copper loading. In batch adsorption method, the maximum removal of copper was experienced when 1 g/L of PPPDA and PPPDA/Chi composite dosages were used at pH 5.0 for PPPDA and 6.0 for PPPDA/Chi composite for 360 min for both sorbents. PPPDA showed adsorption capacity q e max of 650 mg/g whereas its composite achieved q e max of 573 mg/g. The experimental data correlate well with the Freundlich isotherm equation and the pseudo-second order kinetic model. The Cu(II), loaded PPPDA and its composite can be efficiently reused for as many as four cycles. The Cu(II)-loaded sorbents showed high antibacterial efficiency against Gram-positive and Gram-negative bacteria than their unloaded forms.
TURKISH JOURNAL OF CHEMISTRY, 2017
Adsorption of Cu(II) ions and alizarin red S (ARS) has been studied using beads of chitosan (CS) and a chitosan/ZnO nanorod composite (CS-ZnO) in single and binary systems. The beads were synthesized and characterized using Fourier transform infrared spectroscopy, X-ray diffraction, high-resolution transmission electron microscopy, scanning electron microscopy, and energy dispersive X-ray analysis. Factors affecting adsorption of Cu(II) ions and ARS such as pH and initial concentrations as well as adsorption kinetics, isotherms, thermodynamics, reusability, and competitive adsorption in binary systems were studied. The results showed that the adsorption kinetics and isotherm data for both adsorbates followed a pseudo-second-order model and the Freundlich model, respectively. Studies of intraparticle diffusion and Dumwald-Wagner models indicated that the adsorption occurred in a complex mechanism where the intraparticle diffusion stage was not the only rate-determining step for both adsorbates. Thermodynamic studies showed that the adsorption process was favorable, endothermic, and physisorptive in nature. In both single and binary systems, CS-ZnO beads showed better adsorption efficiency than CS beads. For the binary system, Cu(II) ions did not affect the adsorption of ARS; however, ARS reduced the Cu(II) adsorption.
DESALINATION AND WATER TREATMENT, 2020
Amidoximated polyacrylonitrile fibers (AO-PANF) were prepared from the pristine PANF by using hydroxylamine as chelating agent. Thereafter, the AO-PANF was used as adsorbent for removing toxic metals such as copper and nickel from aqueous solutions. Further, the effects of various adsorption parameters, affecting the metal removal from water, such as the aqueous phase pH, the contact time adsorbate–adsorbent, the adsorbent dose, and the temperature, were assessed. The overall data indicate that metal removal from water increases with increasing the magnitude of these adsorption parameters. Furthermore, to evaluate the theoretical trends of the metal adsorption from water onto the AO-PANF adsorbent, the experimental adsorption data were compared to the kinetic and equilibrium theoretical models. Thus, at the equilibrium, a good agreement was found between the data and the Langmuir model, whereas the kinetics results were found to follow the pseudo-second-order. The results have also ...
Indian Journal of Advances in Chemical Science, 2018
The present work reports the development of new chitosan-based membrane by grafting with poly(acrylic acid) and polyaniline by free radical polymerization using ammonium persulfate. Grafting reaction of chitosan-g-poly(acrylic acid)-co-polyaniline (CPANI) was confirmed by Fourier-transform infrared spectroscopy, surface morphology of membranes was characterized by scanning electron microscopy. The influence of various experimental conditions such as pH, time, and initial feed concentrations on the uptake of Cu2+ and Ni2+ by CPANI membrane was tested. The optimum pH was found to be 5.0. It was seen that the adsorption equilibrium data could be fitted to the Langmuir isotherm. Desorption studies were performed in acid media and ethylenediaminetetraacetic acid, to examine whether the CPANI membrane can be recycled for the metal ion removal. The results showed that with CPANI membrane, the maximum metal ion uptake achieved is 1.01 mM g−1 for Cu2+ and 2.41 mM g−1 for Ni2+,respectively. Metal ion sorption studies showed that the membrane can be used for the removal of hazardous metal ions from aqueous solutions. The copper and nickel uptake achieved suggests the potential use of the membrane to extract divalent toxic metals from industrial aqueous streams.
Heavy metal ion removal from aqueous solutions by functionalized polyacrylonitrile
Desalination, 2011
We have investigated adsorption of Hg(II), Fe(III), Pb(II), Ag(I) and Zn(II) from aqueous solutions utilizing functionalized polyacrylonitrile sorbents. By a rapid, simple, and economically feasible route, aminecontaining resins based on polyacrylonitrile (PAN) were prepared through the reaction of polyacrylonitrile with numerous content of diethylenetriamine (DTA), (PAN-DTA50, and PA-DTA 150). The resins and its metal complexes were studied by FTIR (Fourier Transform Infrared) spectroscopy and thermal gravimetric analysis (TGA) and scanning electronic microscopy (SEM) was utilized in order to study the surface morphologies. Consequences of analysis verified the presence of metal in the metal-resin complexes. The sorption behavior of the resins for these ions proved that high sorption can be obtained at higher pH values. The highest sorptions for PAN-DTA150 were found to be 1.38 and 1.42 mmol/g for Zn(II) and Fe(III), respectively. The dependency of amine capacity of the resins on the content of DTA consumption has been confirmed and the maximum capacity of amine was approximately found to be 5 mmol/g for the PAN-DTA50.
Environmental Science and Pollution Research, 2013
Nanocomposite hydrogels based on poly (methacrylamide-co-acrylic acid) and nano-sized montmorillonite were prepared by aqueous dispersion and in situ radical polymerization. Optimum sorption conditions were determined as a function of montmorillonite content, contact time, pH, and temperature. The equilibrium data of Cu 2+ and Ni 2+ conformed to the Freundlich and Langmuir isotherms in terms of relatively high regression values. The maximum monolayer adsorption capacity of the nanocomposite hydrogel (with 3 wt% montmorillonite content), as obtained from the Langmuir adsorption isotherm, was found to be 49.26 and 46.94 mg g −1 for Cu 2+ and Ni 2+ , respectively, at contact time= 60 min, pH=6.8, adsorbent dose=100 mg/ml, and tempera-ture=318 K. Kinetic studies of single system indicated that the pseudo-second order is the best fit with a high correlation coefficient (R 2 =0.97-0.99). The result of five times sequential adsorption-desorption cycle shows a good degree of desorption and a high adsorption efficiency.