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Evaluating the Sorption Affinity of Low Specific Activity 99Mo on Different Metal Oxide Nanoparticles. INORGANICS 2022. [DOI: 10.3390/inorganics10100154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
99Mo/99mTc generators are mainly produced from 99Mo of high specific activity generated from the fission of 235U. Such a method raises proliferation concerns. Alternative methods suggested the use of low specific activity (LSA) 99Mo to produce 99mTc generators. However, its applicability is limited due to the low adsorptive capacity of conventional adsorbent materials. This study attempts to investigate the effectiveness of some commercial metal oxides nanoparticles as adsorbents for LSA 99Mo. In a batch equilibration system, we studied the influence of solution pH (from 1–8), contact time, initial Mo concentration (from 50–500 mg∙L−1), and temperature (from 298–333 K). Moreover, equilibrium isotherms and thermodynamic parameters (changes in free energy ΔG0, enthalpy change ΔH0, and entropy ΔS0) were evaluated. The results showed that the optimum pH of adsorption ranges between 2 and 4, and that the equilibrium was attained within the first two minutes. In addition, the adsorption data fit well with the Freundlich isotherm model. The thermodynamic parameters prove that the adsorption of molybdate ions is spontaneous. Furthermore, some investigated adsorbents showed maximum adsorption capacity ranging from 40 ± 2 to 73 ± 1 mg Mo∙g−1. Therefore, this work demonstrates that the materials used exhibit rapid adsorption reactions with LSA 99Mo and higher capacity than conventional alumina (2–20 mg Mo∙g−1).
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Dzieniszewska A, Nowicki J, Rzepa G, Kyziol-Komosinska J, Semeniuk I, Kiełkiewicz D, Czupioł J. Adsorptive removal of fluoride using ionic liquid-functionalized chitosan - Equilibrium and mechanism studies. Int J Biol Macromol 2022; 210:483-493. [PMID: 35500782 DOI: 10.1016/j.ijbiomac.2022.04.179] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 04/04/2022] [Accepted: 04/24/2022] [Indexed: 01/04/2023]
Abstract
In this study, novel biosorbents, based on chitosan and imidazolium ionic liquid, were prepared for the removal of fluoride from aqueous solutions. The adsorbents were characterized by FTIR, SEM-EDS and low-temperature nitrogen adsorption-desorption. To investigate the adsorption mechanism and behavior of chitosan adsorbents, batch experiments were conducted under different adsorbent dosages (2, 4, 10 g/L), pH (4, 7, 9) and initial concentration (0.5-25.0 mg/L). The influence of the method of synthesis of ionic liquid on the adsorption performance were also studied. Experimental data were evaluated by Freundlich, Langmuir and Sips models. The introduction of ionic liquid significantly improved the uptake of fluoride compared to pure chitosan. The adsorption was influenced by the experimental conditions, as well as the method of ionic liquid synthesis. The highest fluoride removal was observed at pH 4 and found to decrease with increasing pH. The removal efficiency and adsorption capacity values indicated that the dose of 4 g/L was the optimum adsorbent dosage. The equilibrium data fitted best with the Sips isotherm and the maximum adsorption capacity reached 8.068 mg/g for modified chitosan beads. The mechanism of fluoride adsorption onto ionic liquid-modified chitosan involves electrostatic attraction, ion exchange and ion pair interaction.
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Affiliation(s)
- A Dzieniszewska
- Institute of Environmental Engineering PAS, 34 M. Skłodowskiej-Curie St., 41-819 Zabrze, Poland.
| | - J Nowicki
- Łukasiewicz Research Network Institute of Heavy Organic Synthesis "Blachownia", 9 Energetykow Str., 47-225 Kedzierzyn-Kozle, Poland.
| | - G Rzepa
- AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection al. Mickiewicza 30, 30-059 Krakow, Poland.
| | - J Kyziol-Komosinska
- Institute of Environmental Engineering PAS, 34 M. Skłodowskiej-Curie St., 41-819 Zabrze, Poland.
| | - I Semeniuk
- Łukasiewicz Research Network Institute of Heavy Organic Synthesis "Blachownia", 9 Energetykow Str., 47-225 Kedzierzyn-Kozle, Poland.
| | - D Kiełkiewicz
- Łukasiewicz Research Network Institute of Heavy Organic Synthesis "Blachownia", 9 Energetykow Str., 47-225 Kedzierzyn-Kozle, Poland.
| | - J Czupioł
- Institute of Environmental Engineering PAS, 34 M. Skłodowskiej-Curie St., 41-819 Zabrze, Poland.
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Firmansyah ML, Ilmi T, Mukti RR, Patmawati, Goto M. Facile fabrication of a phosphonium-based ionic liquid impregnated chitosan adsorbent for the recovery of hexavalent chromium. RSC Adv 2022; 12:11207-11215. [PMID: 35425075 PMCID: PMC8996754 DOI: 10.1039/d2ra00064d] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 04/04/2022] [Indexed: 11/22/2022] Open
Abstract
Chitosan adsorbents impregnated with a phosphonium-based ionic liquid (Chi_IL), trioctyldodecyl phosphonium chloride, were prepared for the adsorption of hexavalent chromium and compared to the performance of native chitosan. The physical and chemical properties of the adsorbents were characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Effects of various parameters, such as pH, adsorbent dosage, contact time, temperature, and multi-component systems, were systematically examined. Chi_IL showed a high adsorption capacity (282.6 mg g−1) compared to native chitosan (238.1 mg g−1). The adsorption kinetics of the metals followed a pseudo-second-order kinetic model, and the experimental data were a good fit for the Freundlich isotherm model. Following the isotherm and activation energy parameter, adsorption of Cr(vi) onto Chi_IL follows a chemisorption process, possibly through an anionic exchange with the anion of the IL. The thermodynamic parameters suggested that the adsorption of Cr(vi) is a spontaneous and exothermic reaction. In the column adsorption, Chi_IL exhibited a longer column exhaustion time than that of native chitosan owing to the enhanced adsorption capacity caused by the introduction of IL. Moreover, the column with the parameters of 6 cm bed depth, 5 mL min−1 flow rate, and 50 mg L−1 was able to achieve the best performance in Cr(vi) adsorption. Trioctyldodecyl phosphonium chloride was impregnated onto chitosan and able to efficiently remove Cr(vi) in batch and continuous adsorption. The Cr(vi) was chemically adsorbed onto the adsorbent through anionic exchange with the ionic liquid moieties.![]()
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Affiliation(s)
- Mochamad Lutfi Firmansyah
- Nanotechnology Engineering, Faculty of Advanced Technology and Multidiscipline, Airlangga University, Jl. Dr Ir. H. Soekarno, Surabaya 60115, Indonesia
| | - Thalabul Ilmi
- Division of Inorganic and Physical Chemistry, Faculty of Mathematics and Natural Science, Institut Teknologi Bandung, Jl Ganesha 10, Bandung 40132, Indonesia
| | - Rino Rakhmata Mukti
- Division of Inorganic and Physical Chemistry, Faculty of Mathematics and Natural Science, Institut Teknologi Bandung, Jl Ganesha 10, Bandung 40132, Indonesia
- Research Center for Nanoscience and Nanotechnology, Institut Teknologi Bandung, Jl Ganesha 10, Bandung 40132, Indonesia
- Research and Innovation Center for Advanced Materials, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Lampung 35365, Indonesia
| | - Patmawati
- Department of Marine, Faculty of Fisheries and Marine, Universitas Airlangga, Jalan Mulyorejo Kampus C, Surabaya 60115, Indonesia
| | - Masahiro Goto
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Shahr El-Din AM, Sayed MA, Monir TM, Sami NM, Aly AMI. Sponge-like Ca-alginate/Lix-84 beads for selective separation of Mo(VI) from some rare earth elements. Int J Biol Macromol 2021; 184:689-700. [PMID: 34174304 DOI: 10.1016/j.ijbiomac.2021.06.138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 06/14/2021] [Accepted: 06/20/2021] [Indexed: 11/30/2022]
Abstract
In this investigation, a novel alginate complex was developed for the selective separation of molybdenum (Mo(VI)) ions from some rare earth elements (REEs). In this regard, alginate as a natural polysaccharide was impregnated and modified with 2-hydroxy-5-nonylacetophenone oxime (Lix-84) and characterized using FT-IR, TGA/DTA and SEM-EDX. The relation between medium acidity, adsorption kinetics, sorbent dose, isotherm models, temperature and Mo(VI) recovery was investigated. It was concluded that the impregnation stage promoted the Mo(VI) separation. The kinetics and isotherm data were well-fitted and matched with the pseudo-first-order model and Langmuir isotherm model; respectively. The Langmuir maximum adsorption capacity of Mo(VI) reached 72.2 mg/g. The developed material showed excellent separation performance towards Mo ions over the investigated REEs. The desorption and recovery of the loaded Mo(VI) ions were achieved using 1.0 M HCl. Reutilization of Alg/Lix-84 was confirmed up to three adsorption-desorption cycles with no damage of the beads as proved with SEM analysis. The adsorption mechanism of molybdenum onto Alg/Lix-84 was elucidated through FTIR and XPS measurements and was found to be governed by both electrostatic interaction and ion exchange. Therefore, the developed material has a promising potential for the selective separation of molybdenum from REEs-containing solution.
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Affiliation(s)
| | - Moubarak A Sayed
- Hot Lab. Center, Egyptian Atomic Energy Authority, 13759 Cairo, Egypt; Central Lab. for Elemental and Isotopic Analysis, Nuclear Research Center, Egyptian Atomic Energy Authority, Inshas, Cairo, Egypt
| | - Tarek M Monir
- Hot Lab. Center, Egyptian Atomic Energy Authority, 13759 Cairo, Egypt
| | - Nesreen M Sami
- Hot Lab. Center, Egyptian Atomic Energy Authority, 13759 Cairo, Egypt
| | - Amal M I Aly
- Hot Lab. Center, Egyptian Atomic Energy Authority, 13759 Cairo, Egypt
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Masry BA, Shahr El-Din AM, Al-Aidy HA. Ceric-ions redox initiating technique for Zirconium and Niobium separation through graft copolymerization of natural polysaccharides. SEP SCI TECHNOL 2021. [DOI: 10.1080/01496395.2021.1919708] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Botros A. Masry
- Hot Laboratories and Waste Management Centre, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Ahmed M. Shahr El-Din
- Hot Laboratories and Waste Management Centre, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Hend A. Al-Aidy
- Petrochemicals Department, Polymers Lab, Egyptian Petroleum Research Institute, Nasr City, Egypt
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