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Allyl propionate-maleic anhydride-styren terpolymer has been modified with glycerin in order to prepare a new cross-linked functional polymer sorbent. The synthesized cross-linked polymer sorbent has a network structure and contains carboxylic acid, carbonyl, hydroxy, and ester groups, all of which are capable of interacting with metal ions. The so...
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Context 1
... synthesized TPL was characterized by FT-IR (Figure 1) and 1 H-NMR (Figure 2) spectroscopy. The IR spectrum of the TPL shows 2 bands at 1779 cm −1 and 1855 cm −1 , which are assigned to C=O stretching vibrations, and the absorption band at 1222 cm corresponds to the C-O-C stretching vibration in the cyclic anhydride structure. ...
Context 2
... ring-opening reaction of MA units by TEA resulted in the formation of crosslinked polymer with carboxylic groups and ester bonds. The FT-IR spectra of the crosslinked sorbent (SB1) are given in Figure 1. As expected, in the conversion of the anhydride cycle to carboxylic and ester groups after the reaction of TPL with TEA the anhydride absorption intensity peaks at 1855 and 1779 cm −1 were decreased, and instead new carboxyl and ester groups peaks appeared in the range 1700-1727 cm −1 . ...
Context 3
... peak at 3420 cm −1 is relevant to stretching vibration of the hydroxyl group of -COOH and CH 2 CH(OH)CH 2 groups. The FT-IR spectrum of the sorbent after adsorption process (SB2) is given in Figure 1. The intensity of the C=O bands associated with the -COOH group at 1700 cm −1 disappeared while the asymmetric bands of the COO − (carboxylate) structure in the 1540-1560 cm −1 region were formed. ...
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M aleic anhydride-heptene-1-styrene terpolymer has been synthesized and modified with allyl alcohol and methylmethacrylate in order to prepare a new cross-linked functional polymer sorbent. The synthesized terpolymer, mono-allyl ester of terpolymer and synthesized cross-linked sorbent were characterized by Fourier transform infrared and 1 H NMR spe...
Citations
... The most studied and applied method was the adsorption process. A number of researchers have used a variety of adsorbents to remove heavy metal ions from aqueous solutions such as activated carbon, bentonites, zeolites, iron oxides, clays etc. (Akperov & Maharramov 2010, Alic & Manea 2013, Bratkova & Angelov 2013, Erust & Sahin 2014, Mas Haris & Abdul Wahab 2011, Oprčkal & Mladenovič 2017, Hu & Wang 2011. Research on the radioactive pollutants removal from the wastewater by adsorption processes using nano-iron or nano-iron impregnated solid support, gain a more general interest. ...
... In the literature, a number of studies on the uptake of uranium by application of polymeric sorbents are reported (e.g. James et al., 2009;Akperov et al., 2010;Singh and Mishra, 2009). An earlier attempt was also made by our research group to extract uranium from wastewaters by application of IIP (Pakade et al., 2012). ...
... A minimum of 75 mg of IIP material was required for the quantitative removal of uranium from 25 mℓ of aqueous phase. Akperov et al. (2010) observed that by increasing the sorbent weight the sorption degree of the uranyl ions also increased and reached 83.1%-85.0% at the weight of sorbent 0.125-0.15 ...
A selective and reliable method for the extraction of trace quantities of U(VI) by the use of a magnetic U(VI) ion-imprinted polymer (IIP) was developed. In this study, oleic acid (OA) coated magnetite nano-particles were incorporated into the cross-linked polymeric matrix of the selective sorbent, in order to gain the physical advantages of separating the polymers. Many physico-chemical factors influence the adsorption process; uranyl ion uptake ability based on these parameters
was investigated. The optimum parameters obtained were sample pH 4, 50 mg of the magnetic polymer, a contact time of
45 min and an initial U(VI) concentration of 2 mg·ℓ-1. The adsorption capacities for the magnetic NIP and IIP were found to be 0.95 mg·g1 and 1.21 mg·g-1, respectively. The adsorption behaviour of U(VI) in the presence of other competing metal ions onto the cross-linked magnetic polymers was also examined in binary mixtures and the order of selectivity was found to be U(VI) > Pb(VI) > Ni(II). The resulting magnetic nano-composite polymers were found to be stable up to the sixth cycle of use and reuse. The Freundlich adsorption model was used for the mathematical description of the adsorption equilibrium and the adsorption kinetic data fitted the pseudo-first-order model with R2 > 0.92.
... In continuation of the work on studying sorption mechanism of uranyl ions by polymer-sorbents reported already [12,13], in the present article the sorption of uranyl ions is investigated on a synthetic sorbent based on modified maleic anhydrideheptene-1-styrene terpolymer. The analytical characteristics of the sorbent, such as, the solution pH, sorption degree and sorption capacity, have been established and the optimum sorption conditions have been determined. ...
M aleic anhydride-heptene-1-styrene terpolymer has been synthesized and modified with allyl alcohol and methylmethacrylate in order to prepare a new cross-linked functional polymer sorbent. The synthesized terpolymer, mono-allyl ester of terpolymer and synthesized cross-linked sorbent were characterized by Fourier transform infrared and 1 H NMR spectroscopies. The synthesized cross-linked polymer sorbent has a network structure and contains carboxylic acid, carbonyl and ester groups, all of which are capable of interacting with metal ions. The sorption performance of uranyl ions under optimum sorption conditions was evaluated. The analytical characteristics of the sorbent, such as, the solution pH, sorption degree and sorption capacity, have been established and the optimum sorption conditions have been determined. The sorption degree reaches a maximum at pH 6 (73.5%) and the maximum experimental sorption capacity of the sorbent for uranyl ions has been estimated as 1.8 mmol.g -1 (486 mg.g -1). Sorption isotherms of uranyl ions onto prepared polymer sorbent have been measured and the equilibrium data have fitted well to the Langmuir and Freundlich isotherm models. Langmuir and Freundlich isotherm constants and correlation coefficients for the present system are calculated and compared. The obtained values of the Langmuir and Freundlich equations parameters (q max = 2.03 mmol.g -1 , K L = 2.56, K F = 1.33, n = 2.35) specify a sufficient-ly high sorption activity of the synthesized sorbent towards uranyl ions. Uranyl ions are desorbed from the sorbent by treatment with 20-25% hydrochloric and nitric acids.
The capability of the ammonium salt of the cross–linked maleic acid–allylpropionate–styrene terpolymer for the adsorption of Cu²⁺ from aqueous solutions was examined. Effect of the various experimental parameters on removal degree of the copper ions was investigated. Equilibrium data were fitted to the Langmuir, Freundlich, Dubinin-Radushkevich and Temkin isotherm models. Kinetics studies suggested that the adsorption allowed pseudo-second order reaction. The negative values of the ΔG⁰ and the positive value of the ΔH° indicate that the sorption process is spontaneous and endothermic in nature. The positive value of ΔS° shows the increasing randomness during adsorption process. Considering the FT–IR and UV–vis spectra of the sorbent after sorption, it is concluded that Cu²⁺ enters a complex with carboxylate and ester groups of the sorbent.
Micrometer-size poly(vinyl phosphonic acid) (p(VPA)) hydrogel was synthesized by employing UV irradiation of an emulsion containing vinyl phosphonic acid (VPA) and crosslinker, prepared using lecithin as surfactant and gasoline as solvent. The p(VPA) microgels were employed in absorption of UO22+ ions from aqueous environments and have very high and fast absorption capacity. In about 20 min, 670 mg UO22+ ions were absorbed per gram of p(VPA) microgel from the prepared UO22+ ion solution, and the absorption capacity increased up to 900 mg at pH 6. Various parameters affecting UO22+ absorption characteristics of p(VPA) were investigated. It was found that the Langmuir isotherm fitted the absorption characteristics of p(VPA) better than the Freundlich isotherm. Moreover, magnetic ferrite can be prepared within p(VPA) and used as a magnetically responsive p(VPA) microgel composite for externally controlled absorption of UO22+ ions with little decrease in the absorption capacity of the p(VPA) microgel.
Poly(styrene-maleic anhydride) or SMA are versatile copolymers available in different grades of molecular weight (Mw = 5500–170,000 g/mol) and molar percentage of maleic anhydride (22–50 mol-%). As specific grades can be used for the synthesis of nanoscale structures in paper industry, a better understanding of the molecular structure was needed. Therefore, a broad range of SMA grades was analyzed by means of size exclusion chromatography, infrared spectroscopy, Raman spectroscopy and nuclear magnetic resonance spectroscopy. While the nominal composition could be determined by 1H NMR and Raman spectroscopy, the combination with 13C NMR and FTIR allowed a more detailed characterization of the molecular structure. The high-molecular weight SMA grades show a heterogeneous molecular structure with segments including high styrene and maleic anhydride moieties, respectively. The formation of film patterns was evaluated by deposition from an acetone solution, resulting in homogeneous films, fibrous structures, or spherical shapes with decreasing diameter as a function of maleic anhydride content including primary particle sizes of 100 nm. This study illustrates intrinsic molecular features of SMA grades that are capable for self-assembly, and can provide a selection tool for future nanoparticle formulation.
