Use of a Polymer Inclusion Membrane and a Chelating Resin for the Flow-Based Sequential Determination of Copper(II) and Zinc(II) in Natural Waters and Soil Leachates

Ribas, Tânia C. F.; Croft, Charles F.; Almeida, M. Inês G.S.; Mesquita, Raquel B. R.; Kolev, Spas D.; Rangel, António O.S.S.

doi:10.3390/molecules25215062

Cited by 4 publications

(4 citation statements)

References 22 publications

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“…The analysis of the processes in which the minerals or waste containing thorium are processed shows that the classic technologies have material losses in the environment, which could be reduced with or through membrane techniques [ 232 , 233 , 234 , 235 , 236 , 237 , 238 , 239 , 240 , 241 , 242 , 243 , 244 , 245 , 246 , 247 , 248 , 249 , 250 , 251 , 252 , 253 , 254 , 255 ]. Thus, in the classical thorium recovery technologies, some disadvantages [ 1 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65…”

Section: Problems In Application and Achievement As Well As Developme...mentioning

confidence: 99%

“…The problem of thorium separation, concentration and recycling can be approached by analyzing some of the contributions that offer both priority research directions and viable technical solutions ( Table 6 ) [ 232 , 233 , 234 , 235 , 236 , 237 , 238 , 239 , 240 , 241 , 242 , 243 , 244 , 245 , 246 , 247 , 248 , 249 , 250 , 251 , 252 , 253 , 254 , 255 ].…”

Section: Problems In Application and Achievement As Well As Developme...mentioning

confidence: 99%

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Thorium Removal, Recovery and Recycling: A Membrane Challenge for Urban Mining

Man,

Albu,

Nechifor

et al. 2023

Membranes

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Although only a slightly radioactive element, thorium is considered extremely toxic because its various species, which reach the environment, can constitute an important problem for the health of the population. The present paper aims to expand the possibilities of using membrane processes in the removal, recovery and recycling of thorium from industrial residues reaching municipal waste-processing platforms. The paper includes a short introduction on the interest shown in this element, a weak radioactive metal, followed by highlighting some common (domestic) uses. In a distinct but concise section, the bio-medical impact of thorium is presented. The classic technologies for obtaining thorium are concentrated in a single schema, and the speciation of thorium is presented with an emphasis on the formation of hydroxo-complexes and complexes with common organic reagents. The determination of thorium is highlighted on the basis of its radioactivity, but especially through methods that call for extraction followed by an established electrochemical, spectral or chromatographic method. Membrane processes are presented based on the electrochemical potential difference, including barro-membrane processes, electrodialysis, liquid membranes and hybrid processes. A separate sub-chapter is devoted to proposals and recommendations for the use of membranes in order to achieve some progress in urban mining for the valorization of thorium.

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Section: Problems In Application and Achievement As Well As Developme...mentioning

confidence: 99%

Section: Problems In Application and Achievement As Well As Developme...mentioning

confidence: 99%

Thorium Removal, Recovery and Recycling: A Membrane Challenge for Urban Mining

Man,

Albu,

Nechifor

et al. 2023

Membranes

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“…PIMs have been applied in separation processes, e.g., precious metals [14,15], lanthanides [16], alkali metals [17][18][19] and heavy metals [18,[20][21][22][23][24]. PIMs can also be used for the separation of copper(II) and zinc(II) from water and soil solutions [25,26].…”

Section: Introductionmentioning

confidence: 99%

The Use of Polymer Membranes for the Recovery of Copper, Zinc and Nickel from Model Solutions and Jewellery Waste

2023

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A polymeric inclusion membrane (PIM) consisting of matrix CTA (cellulose triacetate), ONPPE (o-nitrophenyl pentyl ether) and phosphonium salts (Cyphos 101, Cyphos 104) was used for separation of Cu(II), Zn(II) and Ni(II) ions. Optimum conditions for metal separation were determined, i.e., the optimal concentration of phosphonium salts in the membrane, as well as the optimal concentration of chloride ions in the feeding phase. On the basis of analytical determinations, the values of parameters characterizing transport were calculated. The tested membranes most effectively transported Cu(II) and Zn(II) ions. The highest recovery coefficients (RF) were found for PIMs with Cyphos IL 101. For Cu(II) and Zn(II), they are 92% and 51%, respectively. Ni(II) ions practically remain in the feed phase because they do not form anionic complexes with chloride ions. The obtained results suggest that there is a possibility of using these membranes for separation of Cu(II) over Zn(II) and Ni(II) from acidic chloride solutions. The PIM with Cyphos IL 101 can be used to recover copper and zinc from jewellery waste. The PIMs were characterized by AFM and SEM microscopy. The calculated values of the diffusion coefficient indicate that the boundary stage of the process is the diffusion of the complex salt of the metal ion with the carrier through the membrane.

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“…PIMs are difficult to incorporate into separation columns unless they are cast onto the surface of the column packing (e.g., glass beads) and/or onto the internal walls of the column . Alternative approaches have been based on packing a separation column with polymer inclusion wool fabricated by electrospinning or PIM strips …”

Section: Introductionmentioning

confidence: 99%

Microfluidic Fabrication of Micropolymer Inclusion Beads for the Recovery of Gold from Electronic Scrap

Zhang

Croft

Cattrall

et al. 2021

ACS Appl. Mater. Interfaces

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A composite material, referred to as micropolymer inclusion beads (μPIBs), was fabricated for the first time using a microfluidic technique and applied successfully for the recovery of Au(III) from simulated digests of electronic scrap. Best results for the extraction of Au(III) were achieved with μPIBs consisting of 55% (m/m) poly(vinyl chloride) as the base polymer, 35% (m/m) Aliquat 336 as the extractant, and 10% (m/m) 1-tetradecanol as a modifier. The size and surface morphology of the μPIBs were examined using optical microscopy and scanning electron microscopy, respectively. A batch of 200 mg μPIBs allowed the complete and selective extraction of Au(III) (2.85 mg) from 50 mL of a simulated digest of electronic scrap containing other metal ions, including 1365 mg Cu(II). The extracted Au(III) was quantitatively stripped from the μPIBs into 50 mL of 0.1 mol L −1 solution of thiourea. No Cu(II) and only sub-microgram levels of Cd(II) and Zn(II) were detected in this solution, thus confirming the suitability of the μPIBs for the efficient recovery of Au(III) from digests of electronic scrap. The microfluidic method used in this study is expected to be applicable for the fabrication of μPIBs for the selective separation of other chemical species by varying the composition of the beads.

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Use of a Polymer Inclusion Membrane and a Chelating Resin for the Flow-Based Sequential Determination of Copper(II) and Zinc(II) in Natural Waters and Soil Leachates

Cited by 4 publications

References 22 publications

Thorium Removal, Recovery and Recycling: A Membrane Challenge for Urban Mining

Thorium Removal, Recovery and Recycling: A Membrane Challenge for Urban Mining

The Use of Polymer Membranes for the Recovery of Copper, Zinc and Nickel from Model Solutions and Jewellery Waste

Microfluidic Fabrication of Micropolymer Inclusion Beads for the Recovery of Gold from Electronic Scrap

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