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Selmani A, Siboulet B, Špadina M, Foucaud Y, Dražić G, Radatović B, Korade K, Nemet I, Kovačević D, Dufrêche JF, Bohinc K. Cation Adsorption in TiO 2 Nanotubes: Implication for Water Decontamination. ACS APPLIED NANO MATERIALS 2023; 6:12711-12725. [PMID: 37533543 PMCID: PMC10391741 DOI: 10.1021/acsanm.3c00916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 06/13/2023] [Indexed: 08/04/2023]
Abstract
TiO2 nanotubes constitute very promising nanomaterials for water decontamination by the removal of cations. We combined a range of experimental techniques from structural analyses to measurements of the properties of aqueous suspensions of nanotubes, with (i) continuous solvent modeling and (ii) quantum DFT-based simulations to assess the adsorption of Cs+ on TiO2 nanotubes and to predict the separation of metal ions. The methodology is set to be operable under realistic conditions, which, in this case, include the presence of CO2 that needs to be treated as a substantial contaminant, both in experiments and in models. The mesoscopic model, based on the Poisson-Boltzmann equation and surface adsorption equilibrium, predicts that H+ ions are the charge-determining species, while Cs+ ions are in the diffuse layer of the outer surface with a significant contribution only at high concentrations and high pH. The effect of the size of nanotubes in terms of the polydispersity and the distribution of the inner and outer radii is shown to be a third-order effect that is very small when the nanotube layer is not very thick (ranging from 1 to 2 nm). Besides, DFT-based molecular dynamics simulations demonstrate that, for protonation, the one-site and successive association assumption is correct, while, for Cs+ adsorption, the size of the cation is important and the adsorption sites should be carefully defined.
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Affiliation(s)
- Atiđa Selmani
- Division
of Physical Chemistry, Ruđer Bošković
Institute, Bijenička
Cesta 54, 10000 Zagreb, Croatia
- Pharmaceutical
Technology & Biopharmacy, Institute
of Pharmaceutical Sciences, University of Graz, A-8010, Graz, Austria
| | - Bertrand Siboulet
- ICSM,
Université Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Ceze, France
| | - Mario Špadina
- Division
of Physical Chemistry, Ruđer Bošković
Institute, Bijenička
Cesta 54, 10000 Zagreb, Croatia
- Faculty
of Health Sciences, University of Ljubljana, Zdravstvena 5, SI-1000 Ljubljana, Slovenia
| | - Yann Foucaud
- ICSM,
Université Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Ceze, France
| | - Goran Dražić
- Laboratory
for Materials Chemistry, National Institute
of Chemistry, Hajdrihova ulica 19, SI-1000 Ljubljana, Slovenia
| | | | - Karla Korade
- Faculty of
Science, University of Zagreb, Horvatovac 102A, 10 000 Zagreb, Croatia
| | - Ivan Nemet
- Faculty of
Science, University of Zagreb, Horvatovac 102A, 10 000 Zagreb, Croatia
| | - Davor Kovačević
- Faculty of
Science, University of Zagreb, Horvatovac 102A, 10 000 Zagreb, Croatia
| | | | - Klemen Bohinc
- Faculty
of Health Sciences, University of Ljubljana, Zdravstvena 5, SI-1000 Ljubljana, Slovenia
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Keesari T, Sabarathinam C, Sinha UK, R T, Kamaraj P. Fate and transport of strontium in groundwater from a layered sedimentary aquifer system. CHEMOSPHERE 2022; 307:136015. [PMID: 35973489 DOI: 10.1016/j.chemosphere.2022.136015] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 07/05/2022] [Accepted: 08/07/2022] [Indexed: 06/15/2023]
Abstract
In this article, strontium distribution in sedimentary coastal aquifers of Eastern India was studied and its association with groundwater particles has been ascertained using hydrochemical and morphological tools. Groundwater contains Sr2+ in the range of 0.08-4.0 mg/L with higher concentrations in Cretaceous formation. The particle number in groundwater varies from 4.5 × 105 to 3.3 × 106 per liter and follows the power law distribution with respect to the particle diameter. The calculated β values (2.54 and 4.03) signify the abundance of smaller particles over larger ones. The particle concentration of size range 0.45-8 μm is found to be 0.64-2.6 mg/L. Elemental data of groundwater particles clearly suggest their origin from the host rock minerals. Zeta potential data indicates diverse nature of colloids suggesting prevalence of both positive and negative charged species in the groundwater. The hydrochemical interpretation along with speciation studies infers that high Sr2+ in groundwater is a result of incongruent dissolution of carbonate minerals and the dissolved Sr2+ partitions into both dissociated and un-dissociated forms. Based on the Sr2+/Ca2+ ratio and mineral saturation indices, it can be inferred that the Sr2+ is preferentially associated with colloids over large particles and the migration takes place through sorption of Sr2+ onto clay-bound (extrinsic) colloids in groundwater. This study describes the mechanism of strontium release into groundwater and provides insights into the role of groundwater particles in controlling the strontium migration to deep aquifers.
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Affiliation(s)
- Tirumalesh Keesari
- Isotope Hydrology Section, Isotope and Radiation Application Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India; Homi Bhabha National Institute, Mumbai, 400 094, India.
| | - Chidambaram Sabarathinam
- Department of Earth Sciences, Annamalai University, Annamalai Nagar, India; Water Research Center, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat, 13109, Kuwait
| | - Uday Kumar Sinha
- Isotope Hydrology Section, Isotope and Radiation Application Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
| | - Thilagavathi R
- Department of Earth Sciences, Annamalai University, Annamalai Nagar, India
| | - Pradeep Kamaraj
- School of Applied Natural Sciences (SoANS), Adama Science & Technology University, Adama, Ethiopia
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Liu J, Dotsuta Y, Sumita T, Kitagaki T, Ohnuki T, Kozai N. Potential bacterial alteration of nuclear fuel debris: a preliminary study using simulants in powder and pellet forms. J Radioanal Nucl Chem 2022. [DOI: 10.1007/s10967-022-08324-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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ALSamman MT, Sánchez J. Chitosan- and Alginate-Based Hydrogels for the Adsorption of Anionic and Cationic Dyes from Water. Polymers (Basel) 2022; 14:polym14081498. [PMID: 35458248 PMCID: PMC9025658 DOI: 10.3390/polym14081498] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 03/28/2022] [Accepted: 03/30/2022] [Indexed: 02/04/2023] Open
Abstract
Novel hydrogel systems based on polyacrylamide/chitosan (PAAM/chitosan) or polyacrylic acid/alginate (PAA/alginate) were prepared, characterized, and applied to reduce the concentrations of dyes in water. These hydrogels were synthetized via a semi-interpenetrating polymer network (semi-IPN) and then characterized by Fourier transformed infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA), and their swelling capacities in water were measured. In the adsorption experiments, methylene blue (MB) was used as a cationic dye, and methyl orange (MO) was used as an anionic dye. The study was carried out using a successive batch method for the dye absorption process and an equilibrium system to investigate the adsorption of MO on PAAM/chitosan hydrogels and MB on PAA/alginate in separate experiments. The results showed that the target hydrogels were synthetized with high yield (more than 90%). The chemical structure of the hydrogels was corroborated by FTIR, and their high thermal stability was verified by TGA. The absorption of the MO dye was higher at pH 3.0 using PAAM/chitosan, and it had the ability to remove 43% of MO within 10 min using 0.05 g of hydrogel. The presence of interfering salts resulted in a 20–60% decrease in the absorption of MO. On the other hand, the absorption of the MB dye was higher at pH 8.5 using PAA/alginate, and it had the ability to remove 96% of MB within 10 min using 0.05 g of hydrogel, and its removal capacity was stable for interfering salts.
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