Novel glass-based membranes for Cu adsorption: From alkali activation to sintering
A porous membrane was developed through alkali activation of pharmaceutical boro-alumino-silicate glass powders suspended in diluted NaOH and KOH aqueous solutions (2.5 M). A consolidated porous structure was obtained by the binding of unreacted particles mediated by a surface gel, developed upon dr...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-08-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844023054294 |
| _version_ | 1797733087541460992 |
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| author | Diana Lago Jozef Kraxner Dušan Galusek Enrico Bernardo |
| author_facet | Diana Lago Jozef Kraxner Dušan Galusek Enrico Bernardo |
| author_sort | Diana Lago |
| collection | DOAJ |
| description | A porous membrane was developed through alkali activation of pharmaceutical boro-alumino-silicate glass powders suspended in diluted NaOH and KOH aqueous solutions (2.5 M). A consolidated porous structure was obtained by the binding of unreacted particles mediated by a surface gel, developed upon drying of the suspensions and their curing at 40 °C for 14 days. The binding phase was sufficiently stable to resist immersion in boiling water and in acidic solutions. Copper adsorption tests were carried out under acidic pH, immersing the membranes in a Cu(NO3)2 solution for different periods of time. To determine the effect of surface washing on capture of copper ions, adsorption experiments with washed and unwashed membranes were also carried out, at varying pH. It was determined that the adsorption kinetics follow the pseudo-second-order kinetic model. The main adsorption mechanism observed is the electrostatic interaction between the negative surface charge of the washed membrane and the Cu2+ ions present in solution. An adsorption higher than 60% was observed at pH = 5, while at pH = 2 the efficiency decreased due to the presence of H3O+ ions. To ensure immobilization of copper, the membranes were densified by viscous flow sintering at a moderate temperature (700 °C). Leaching tests on membranes demonstrated the efficiency of the process in terms of copper ions immobilization. |
| first_indexed | 2024-03-12T12:22:58Z |
| format | Article |
| id | doaj.art-baf28a413d9841b1a7a7ccc951701409 |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-03-12T12:22:58Z |
| publishDate | 2023-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-baf28a413d9841b1a7a7ccc9517014092023-08-30T05:50:58ZengElsevierHeliyon2405-84402023-08-0198e18221Novel glass-based membranes for Cu adsorption: From alkali activation to sinteringDiana Lago0Jozef Kraxner1Dušan Galusek2Enrico Bernardo3FunGlass – Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, Študentská 2, 911 50, Trenčín, Slovakia; Corresponding author.FunGlass – Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, Študentská 2, 911 50, Trenčín, SlovakiaFunGlass – Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, Študentská 2, 911 50, Trenčín, Slovakia; Joint Glass Centre of the IIC SAS, TnUAD and FChFT STU, 911 50, Trenčín, SlovakiaDepartment of Industrial Engineering, University of Padova, Via Marzolo 9, Padova, 35131, ItalyA porous membrane was developed through alkali activation of pharmaceutical boro-alumino-silicate glass powders suspended in diluted NaOH and KOH aqueous solutions (2.5 M). A consolidated porous structure was obtained by the binding of unreacted particles mediated by a surface gel, developed upon drying of the suspensions and their curing at 40 °C for 14 days. The binding phase was sufficiently stable to resist immersion in boiling water and in acidic solutions. Copper adsorption tests were carried out under acidic pH, immersing the membranes in a Cu(NO3)2 solution for different periods of time. To determine the effect of surface washing on capture of copper ions, adsorption experiments with washed and unwashed membranes were also carried out, at varying pH. It was determined that the adsorption kinetics follow the pseudo-second-order kinetic model. The main adsorption mechanism observed is the electrostatic interaction between the negative surface charge of the washed membrane and the Cu2+ ions present in solution. An adsorption higher than 60% was observed at pH = 5, while at pH = 2 the efficiency decreased due to the presence of H3O+ ions. To ensure immobilization of copper, the membranes were densified by viscous flow sintering at a moderate temperature (700 °C). Leaching tests on membranes demonstrated the efficiency of the process in terms of copper ions immobilization.http://www.sciencedirect.com/science/article/pii/S2405844023054294Porous membranesAlkali activationCooper adsorptionSintering |
| spellingShingle | Diana Lago Jozef Kraxner Dušan Galusek Enrico Bernardo Novel glass-based membranes for Cu adsorption: From alkali activation to sintering Heliyon Porous membranes Alkali activation Cooper adsorption Sintering |
| title | Novel glass-based membranes for Cu adsorption: From alkali activation to sintering |
| title_full | Novel glass-based membranes for Cu adsorption: From alkali activation to sintering |
| title_fullStr | Novel glass-based membranes for Cu adsorption: From alkali activation to sintering |
| title_full_unstemmed | Novel glass-based membranes for Cu adsorption: From alkali activation to sintering |
| title_short | Novel glass-based membranes for Cu adsorption: From alkali activation to sintering |
| title_sort | novel glass based membranes for cu adsorption from alkali activation to sintering |
| topic | Porous membranes Alkali activation Cooper adsorption Sintering |
| url | http://www.sciencedirect.com/science/article/pii/S2405844023054294 |
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