LIX®-loaded polymer inclusion membrane for copper(II) transport (original) (raw)
Related papers
Journal of Membrane …, 2006
The effects of different components on the performance of a selected polymer inclusion membrane (PIM) system developed for copper transport were assessed by means of different analytical techniques. Copper(II) transport data, thermal analysis, transmission infrared mapping microspectroscopy (TIMM) and AFM were used to characterize chemical and physical behavior of PIMs with different compositions. The prepared membranes, made using cellulose triacetate (CTA) as support, tris(2-n-butoxyethyl) phosphate (TBEP) as plasticizer, together with an additive (ethanol), and LIX ® 84-I, LIX ® 984 or LIX ® 54-100 as carrier, showed increasing copper(II) permeabilities in the order LIX ® 54-100 < LIX ® 984 < LIX ® 84-I. Membrane permeabilities increased up to 2.6-fold in the strip solution side for LIX ® 84-I PIMs cast with ethanol, and Cu(II) accumulation within the membrane was observed to vary with the amount of additive. The modifications of the transport properties of the PIMs were satisfactorily correlated with the distribution profiles of the membrane components (obtained by TIMM), glass transition temperatures, casting method and topographic structure of the films with the aid of a Teas graph implemented for PIM applications. From this graph it was possible to interpret the interactions between the different membrane components in a phenomenological way, thus contributing to improve the understanding of the role played by each one in the development of a more efficient PIM system for copper transport when using LIX ® reagents as carriers.
Membranes, 2020
This study investigates copper(II) ion transport through a polymer inclusion membrane (PIM) containing 1-alkyl-1,2,4-triazole (n = 8, 9, 10, 11, 12, 14), o-nitrophenyl octyl ether as the plasticizer and cellulose triacetate as the polymer matrix. The feeding phase was a solution of 0.1 mol/dm3CuCl2 and an equimolar (0.1 mol/dm3) mixture of copper, nickel, and cobalt chlorides with varying concentrations of chloride anions (from 0.5 to 5.0 mol/dm3) established with NaCl. The receiving phase was demineralized water. The flow rate of the source and receiving phases through the membrane module was within the range from 0.5 cm3/min to 4.5 cm3/min. The tests were carried out at temperatures of 20, 30, 40 and 50 °C. Transport of NaCl through the membrane was excluded for the duration of the test. It was noted that the flow rate through the membrane changes depending on the length of the carbon chain in the alkyl substituent from 16.1 μmol/(m2s) to 1.59 μmol/(m2s) in the following order: C8...
Jurnal Kimia Valensi
Polymer Inclusion Membranes (PIMs) have been fabricated for diffusive passive sample layers. A study of various concentrations of plasticizers and characterization of PIM performance on phosphate transport has been carried out. The composition of PIM consisted of cellulose triacetate (CTA) as the base polymer, Aliquot 336-Cl as a carrier, and 2-Nitro phenyl octyl ether (2-NPOE) as a plasticizer. The plasticizer concentration varied between 0 and 10% (w/w). The performance of PIM on phosphate transport was studied with a passive sampler filled with 15 mL 0.1 M NaCl as the internal phase. The passive samplers were deployed into the bulk phase of a phosphate solution of 0.6 mg/L for 0-48 hours. The phosphate concentration in the passive sampler was determined using the visible spectrophotometry method at 691 nm (in the bulk phase) and 710 nm (in the internal phase). PIMs were characterized for stress-strain, contact angle, surface morphology, and cross-section. The sampling rate of pho...
Separation and Purification Technology, 2007
The separation of copper(II), cobalt(II) and nickel(II) from aqueous chloride solutions by polymer inclusion membranes is presented. The tertiary amines, i.e. tri-n-octylamine (TOA) and triisooctylamine (TIOA) have been applied as the ion carriers in membrane. The source phase was an aqueous HCl solution containing Cu(II), Co(II) and Ni(II). The selective transport of Cu(II), Co(II) and Ni(II) from aqueous chloride source phase through PIM containing cellulose triacatate (CTA) as the support, o-nitrophenyl pentyl ether (ONPPE) as the plasticizer and amines (TOA and TIOA) has been studied. Cu(II) and Co(II) ions were effectively removed from the source phase by transport through PIMs with TOA and TIOA as the ionic carriers into 0.1 M NaOH as the receiving phase. The initial fluxes of Cu(II) and Co(II) were higher with TIOA than with TOA. Ni(II) was not detected in the receiving phase. The effect of chloride ions concentration on the transport of Cu(II), Co(II) and Ni(II) has been investigated. Transport of Cu(II) and Co(II) increases with increasing of chloride ions concentration in the source phase. The metal ions fluxes decrease in the order Cu(II) > Co(II) > Ni(II).
Selective transport of Ag+ and Cu2+ across plasticized membranes with calix[4]pyrrole[2]thiophene
Desalination, 2012
Transport experiments across polymer inclusion membranes (PIMs) are presented. The physical immobilization of calix[4]pyrrole[2]thiophene (CPY) as the ion carrier and o-nitrophenyl octyl ether (ONPOE) in cellulose triacetate (CTA) as the support was used to prepare polymer inclusion membranes. The competitive transport of Ag + and Cu 2+ ions from nitrate aqueous solutions through a PIM with CPY was investigated. The selectivity of competitive transport from the source phase decreases as follows: Ag + > Cu 2+. The flux values for Ag + and Cu 2+ obtained after 24 h processes were found to be 0.30 ± 0.05 μmol/m 2 s and 0.03 ± 0.05 μmol/m 2 s, respectively. Separation of Ag + over Cu 2+ at low concentrations of the carrier in the membrane is better than at high concentration. The efficiency of Ag + and Cu 2+ was higher for Na 2 S 2 O 3 than EDTA solution as receiving aqueous phases.
Journal of Hazardous Materials, 2010
In this work, a development of polymeric inclusion membranes for the cations separation is reported. The membrane was made up of cellulose triacetate (CTA) with a tributyl phosphate (TBP) incorporated into the polymer as metal ions carrier. The transport of lead (II) and cadmium (II) ions in two membrane systems polymer inclusion membrane (PIM), PIM coupled with photo-chemical electrode using TBP as carrier and 2-nitro phenyl octyl ether (NPOE) or tris ethylhexyl phosphate (TEHP) as plasticizer have been investigated. The membranes: polymer + plasticizer + carrier were synthesized and characterized by FTIR, X-ray diffraction and scanning electron microscopy (SEM). Transports of lead and cadmium have been studied using these systems and the results were compared to commercial cation exchange membrane (CRA). The obtained results showed that for Pb 2+ ion, the concentrations of the strip phase increases using synthesized membranes. The conduction band of the delafossite CuFeO 2 (−1.25 V SCE) yields a thermodynamically M 2+ (=Pb 2+ , Cd 2+) photo electrodeposition and speeds up the diffusion process. In all the cases, the potential of the electrode M/M 2+ in the feed compartment increases until a maximum value, reached at ∼100 min above which it undergoes a diminution.
Characterization of polymer inclusion membrane containing Aliquat 336 as a carrier
Membrane Water Treatment, 2015
The present research reports on the investigation of separation of Co (II) from mixtures of cobalt and nickel solutions using CTA based PIMs which incorporated the commercial extractant Aliquat 336. Tributylphosphate (TBP) was used a modifier. 2-Nitro phenyl pentyl ether (NPPE) was applied as plasticizer for the preparation of the membranes. Chemical and physical characteristics of the synthesized membranes were investigated. Several important transport parameters such as thickness of membrane and the effect of the different sides of the membrane were discussed. Membrane extraction experiment showed that the glass-facing surface has higher extraction efficiency than the air-facing surface. The membrane was characterized by means of AFM, FT-IR and SEM.
Separation and Purification Technology, 2011
CTA polymer inclusion membranes (PIMs) containing an acidic carrier (D2EHPA) were prepared and characterized by Fourier transform infrared resonance (FT-IR) spectroscopy and thermogravimetric analyses (TGA). The surface and cross-section morphology of the membrane was inspected by scanning electron microscopy (SEM). The gas transport properties of the membranes were obtained by using pure gases. The permeability and permselectivity coefficients of He, H 2 , N 2 , O 2 , CH 4 and CO 2 in PIMs were determined at two temperature values (25 and 50°C), feeding single gases (purity level 99.998%) at atmospheric pressure and keeping the permeate side under vacuum (10 À2 mbar). The gas permeability of the pure CTA polymer membrane increases with the temperature for all species considered and the permeation rate order is the following: He > H 2 > CO 2 > O 2 > CH 4 > N 2. The same trend with the temperature was also observed for the samples where the plasticizer (2-NPOE) and D2EHPA were added and a significant increase of the permeation rate of all gases was recorded. In most cases, the ideal permselectivity values, measured through these membranes, result lower than those calculated in neat polymer. However, CO 2 / H 2 permselectivity increases during the addition of the plasticizer and extractant.
Cellulose Chemistry and Technology
Polymeric membranes used for selective transport and separation of metallic ions have emerged in recent times. Their expansion depends on the method of preparation and their suitable structure and physico-chemical characteristics. In this paper, a novel category of membranes for ions separation is reported. The membranes were synthesized by the solvent evaporation method, using a mixture of polysulfone (PSL) and cellulose triacetate (CTA) or poly(methyl methacrylate) (PMMA). The synthesized membrane exhibited hydrophobicity and thermal stability at more than 120 °C, as well as a more or less porous structure. The competitive transport of Ni(II), Zn(II) and Pb(II) from aqueous solutions through the polymeric membranes was studied. Competitive transport experiments through the synthesized membranes showed that Ni(II) was selectively and efficiently transported by the three types of membranes, a transport efficiency exceeding well over 45% being achieved by using the PSL based membrane...
The Permeability of Polyester Film (PEN) to Copper Ions
International Journal of Polymer Analysis and Characterization, 2013
Ion exchange membranes (IEM) are often applied in the processes of separation and purification solutions, primarily in the chemical, food, and pharmaceutical industries. Most are currently made from organic polymers, such as polyamide and polyimide. In this work, a study of the permeability of polyethylene naphthalate film (PEN) to copper Cu(II) (heavy metal), using the Donnan dialysis technique, has allowed us, first, to highlight a new anion exchange membrane (AEM), and second, to improve its capabilities for the elimination of copper ions after heat treatment.