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Perera IN, Dobhal GS, Pringle JM, O'Dell LA, Tawfik SA, Walsh TR, Pozo-Gonzalo C. A case study using spectroscopy and computational modelling for Co speciation in a deep eutectic solvent. Phys Chem Chem Phys 2024; 26:21087-21098. [PMID: 39058209 DOI: 10.1039/d4cp01471e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2024]
Abstract
Cobalt has a vital role in the manufacturing of reliable and sustainable clean energy technologies. However, the forecasted supply deficit for cobalt is likely to reach values of 150 kT by 2030. Therefore, it is paramount to consider end-of-life devices as secondary resources for cobalt. Electrorecovery of cobalt from leached solutions has attracted attention due to the sustainability of the recovery process over solvent extraction followed by chemical precipitation. Recently, we reported Co electrorecovery from two different cobalt sources (CoCl2·6H2O and CoSO4·7H2O) using ethylene glycol : choline chloride (EG : ChCl) in a 4.5 : 1 molar ratio, leading to higher purity and easier electrodeposition when sulfate was present as an additive. Here, Co2+ speciation is reported for the two EG : ChCl systems depending on the cobalt source using several spectroscopic techniques (e.g. NMR, EPR, FTIR) in combination with molecular dynamics simulations. Monodentate coordination of SO42- to Co2+, forming the tetrahedral [CoCl3(SO4)]3- was observed as the dominant structure in the system containing CoSO4·7H2O, whereas the system comprising CoCl2·6H2O shows a homoleptic tetrahedral [CoCl4]2- as the dominant structure. This resulted in knowledge being gained regarding Co2+ speciation and the correlation with electrochemistry will contribute to the science required for designing safe electrolytes for efficient electrorecovery.
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Affiliation(s)
- Isuri N Perera
- Institute for Frontier Materials, Deakin University, Melbourne, Victoria 3125, Australia.
| | - Garima S Dobhal
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
| | - Jennifer M Pringle
- Institute for Frontier Materials, Deakin University, Melbourne, Victoria 3125, Australia.
| | - Luke A O'Dell
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
| | | | - Tiffany R Walsh
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
| | - Cristina Pozo-Gonzalo
- Institute for Frontier Materials, Deakin University, Melbourne, Victoria 3125, Australia.
- Aragonese Foundation for Research and Development (ARAID), Av. de Ranillas 1-D, 50018 Zaragoza, Spain
- Instituto de Carboquímica (ICB-CSIC), C/Miguel Luesma Castán, 4, 50018, Zaragoza, Spain
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Gómez E, Fons A, Cestaro R, Serrà A. Enhanced Activation of Peroxymonosulfate for Tetracycline Degradation Using CoNi-Based Electrodeposited Films. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:790. [PMID: 36903668 PMCID: PMC10005342 DOI: 10.3390/nano13050790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 02/17/2023] [Accepted: 02/20/2023] [Indexed: 06/18/2023]
Abstract
Synthesizing efficient heterogeneous catalysts with multiple active sites able to activate peroxymonosulfate (PMS) for the degradation of persistent organic pollutants continues to be a challenge for societies worldwide. In response, cost-effective, eco-friendly oxidized Ni-rich and Co-rich CoNi micro-nanostructured films were fabricated following a two-step process based on simple electrodeposition using green deep eutectic solvent as an electrochemical media and thermal annealing. The CoNi-based catalysts demonstrated exceptional efficiency in the heterogeneous catalyzed activation of PMS for tetracycline degradation and mineralization. The effects of the catalysts' chemical nature and morphology, the pH, the concentration of PMS, irradiation with visible light, and the duration of contact with the catalysts on the degradation and mineralization of tetracycline were also studied. In dark conditions, oxidized Co-rich CoNi degraded more than 99% of tetracyclines in only 30 min and mineralized more than 99% of them in only 60 min. Moreover, the degradation kinetics doubled from 0.173 min-1 in dark conditions to 0.388 min-1 under visible light irradiation. In addition, the material demonstrated excellent reusability and can be easily recovered with simple heat treatment. Given those findings, our work provides new strategies for constructing high-efficiency and cost-effective PMS catalysts and elucidating the effects of operational parameters and primary reactive species formed by the catalyst-PMS system on water treatment technologies.
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Affiliation(s)
- Elvira Gómez
- Grup d’Electrodeposició de Capes Primes i Nanoestructures (GE-CPN), Departament de Ciència de Materials i Química Física, Universitat de Barcelona, Martí i Franquès, 1, 08028 Barcelona, Catalonia, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, 08028 Barcelona, Catalonia, Spain
| | - Arnau Fons
- Grup d’Electrodeposició de Capes Primes i Nanoestructures (GE-CPN), Departament de Ciència de Materials i Química Física, Universitat de Barcelona, Martí i Franquès, 1, 08028 Barcelona, Catalonia, Spain
| | - Roberto Cestaro
- Empa Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Joining Technologies and Corrosion, CH-8600 Dübendorf, Switzerland
| | - Albert Serrà
- Grup d’Electrodeposició de Capes Primes i Nanoestructures (GE-CPN), Departament de Ciència de Materials i Química Física, Universitat de Barcelona, Martí i Franquès, 1, 08028 Barcelona, Catalonia, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, 08028 Barcelona, Catalonia, Spain
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Gómez E, Fons A, Cestaro R, Serrà A. Electrodeposition of CoNi alloys in a biocompatible DES and its suitability for activating the formation of sulfate radicals. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Electrodeposition of Cobalt from Ethylene Carbonate-AlCl3-CoCl2 Electrolyte System. Electrocatalysis (N Y) 2022. [DOI: 10.1007/s12678-022-00748-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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