1
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Wang C, Guo Y, Türel T, Tomović Ž. Fabrication of High-Performance Polyisocyanurate Aerogels through Cocyclotrimerization of 4,4'-Methylene Diphenyl Diisocyanate and Its Mono-Urethane Derivatives. ACS APPLIED MATERIALS & INTERFACES 2024; 16:35604-35612. [PMID: 38920358 PMCID: PMC11247422 DOI: 10.1021/acsami.4c07480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Revised: 06/17/2024] [Accepted: 06/18/2024] [Indexed: 06/27/2024]
Abstract
Aromatic polyisocyanurate (PIR) aerogels are recognized as advanced porous materials and extensively studied due to their lightweight nature, high porosity, and specific surface area, which attribute to their outstanding thermal insulation properties. The inherent thermal stability of the PIR moieties, combined with great insulating performance, renders PIR aerogels highly suitable for building insulation applications. Nevertheless, materials containing isocyanurate obtained through direct trimerization of aromatic isocyanates exhibit brittleness, resulting in inferior mechanical performance. In order to enhance the processability of the PIR aerogels, we propose a cocyclotrimerization approach involving mixtures of mono- and difunctional aromatic isocyanates. This approach is designed to develop a PIR network with decreased cross-linking density and brittleness. Herein, we developed an array of PIR aerogels from different alkyl chain-modified isocyanate mixtures. The resulting PIR aerogels exhibited high porosity (>89%), a large surface area (∼300 m2/g), superinsulating performance with ultralow thermal conductivity (∼16.8 mW m-1 K-1), notable thermal stability (Td5% ∼ 250 °C), improved mechanical performance, and intrinsic hydrophobicity without the need for postmodification. These high-performance organic aerogels hold significant promise for applications requiring superinsulating materials.
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Affiliation(s)
- Changlin Wang
- Polymer Performance Materials
Group, Department of Chemical Engineering and Chemistry, Eindhoven University
of Technology, 5600 MB Eindhoven, The Netherlands
| | - Yunfei Guo
- Polymer Performance Materials
Group, Department of Chemical Engineering and Chemistry, Eindhoven University
of Technology, 5600 MB Eindhoven, The Netherlands
| | - Tankut Türel
- Polymer Performance Materials
Group, Department of Chemical Engineering and Chemistry, Eindhoven University
of Technology, 5600 MB Eindhoven, The Netherlands
| | - Željko Tomović
- Polymer Performance Materials
Group, Department of Chemical Engineering and Chemistry, Eindhoven University
of Technology, 5600 MB Eindhoven, The Netherlands
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2
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Sha R, Dai J, Wang B, Sha J. Improving Pore Characteristics, Mechanical Properties and Thermal Performances of Near-Net Shape Manufacturing Phenolic Resin Aerogels. Polymers (Basel) 2024; 16:1593. [PMID: 38891539 PMCID: PMC11174628 DOI: 10.3390/polym16111593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Revised: 05/31/2024] [Accepted: 06/02/2024] [Indexed: 06/21/2024] Open
Abstract
Thermally stable high-performance phenolic resin aerogels (PRAs) are of great interest for thermal insulation because of their light weight, fire retardancy and low thermal conductivity. However, the drawbacks of PRA synthesis, such as long processing time, inherent brittleness and significant shrinkage during drying, greatly restrict their wide applications. In this work, PRAs were synthesized at ambient pressure through a near-net shape manufacturing technique, where boron-containing thermosetting phenolic resin (BPR) was introduced into the conventional linear phenolic resin (LPR) to improve the pore characteristics, mechanical properties and thermal performances. Compared with the traditional LPR-synthesized aerogel, the processing time and the linear shrinkage rate during the drying of the PRAs could be significantly reduced, which was attributed to the enhanced rigidity and the unique bimodal pore size distribution. Furthermore, no catastrophic failure and almost no mechanical degradation were observed on the PRAs, even with a compressive strain of up to 60% at temperatures ranging from 25 to 200 °C, indicating low brittleness and excellent thermo-mechanical stability. The PRAs also showed outstanding fire retardancy. On the other hand, the PRAs with a density of 0.194 g/cm3 possessed a high Young's modulus of 12.85 MPa and a low thermal conductivity of 0.038 W/(m·K).
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Affiliation(s)
- Ruyi Sha
- Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province, Dalian University of Technology, Dalian 116024, China; (R.S.)
| | - Jixiang Dai
- Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province, Dalian University of Technology, Dalian 116024, China; (R.S.)
| | - Bingzhu Wang
- Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province, Dalian University of Technology, Dalian 116024, China; (R.S.)
| | - Jianjun Sha
- Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province, Dalian University of Technology, Dalian 116024, China; (R.S.)
- State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
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3
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Ali A, Ganie SA, Mir TA, Mazumdar N. Synthesis and characterization of amino-functionalized guar gum based polyurea: Preparation of iodine complexes, structural investigation and release studies. Int J Biol Macromol 2024; 271:132711. [PMID: 38815942 DOI: 10.1016/j.ijbiomac.2024.132711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 04/27/2024] [Accepted: 05/27/2024] [Indexed: 06/01/2024]
Abstract
Biobased materials are expanding dramatically in various industrial applications due to their unique intrinsic properties. In this study, various chemical functionalization procedures were used to synthesize guar gum, a naturally occurring polysaccharide-based polyurea, and its iodine complexes. Firstly, guar gum was subjected to tosylation reaction using p-toluene sulphonyl chloride to introduce tosyl moieties in the polymer chain with the degree of substitution (DS) ranging between 0.16 and 1.54. Sample having the highest degree of tosyl moiety was further reacted with tris(2-aminoethyl) amine to produce 6-deoxy-6-tris(2-aminoethyl) amine derivative via nucleophilic substitution reaction to impart amino functional groups. The degree of substitution in 6-deoxy-6-tris(2-aminoethyl) amine derivative was found to be 0.59. 6-deoxy-6-tris(2-aminoethyl) amine derivative was reacted with different diisocyanates (Toluene-2,4-diisocyanate (TDI), 1,6-diisocyanatohexane (HMDI)) to produce guar gum based polyurea. Iodine complexes of the resulting polyurea were prepared by reacting with different iodinating agents. Different chemical reactions, formation of polyurea and its iodine complexes were thoroughly analyzed by different analytical techniques such as FT-IR, NMR, elemental analysis, XRD, UV-Vis spectroscopy, and a reaction scheme has been proposed. Morphological and rheological characteristics were analyzed by SEM and viscosity measurement. Thermal analysis was carried out by TGA and DSC studies. Finally, by examining the complex's UV-Vis spectra, the iodine release characteristics from polyurea‑iodine complexes were investigated.
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Affiliation(s)
- Akbar Ali
- Materials (Polymer) Research Laboratory, Department of Chemistry, Jamia Millia Islamia, Central University, New Delhi 110025, India; Department of Chemistry, Kargil Campus, University of Ladakh, Kargil 194103, India.
| | - Showkat Ali Ganie
- Materials (Polymer) Research Laboratory, Department of Chemistry, Jamia Millia Islamia, Central University, New Delhi 110025, India
| | - Tariq Ahmed Mir
- Materials (Polymer) Research Laboratory, Department of Chemistry, Jamia Millia Islamia, Central University, New Delhi 110025, India
| | - Nasreen Mazumdar
- Materials (Polymer) Research Laboratory, Department of Chemistry, Jamia Millia Islamia, Central University, New Delhi 110025, India.
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Waqar A, Shafiq N, Bheel N, Benjeddou O, Hamah Sor N, Hu JW, Najm HM, Almujibah HR. Modeling of success factors of using PU coats in concrete construction projects. Heliyon 2024; 10:e28908. [PMID: 38601646 PMCID: PMC11004573 DOI: 10.1016/j.heliyon.2024.e28908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 03/02/2024] [Accepted: 03/26/2024] [Indexed: 04/12/2024] Open
Abstract
Polyurea coatings are well recognized for their remarkable protective properties, making them highly appropriate for practical use in the field of concrete building. The use of polyurea coatings in the concrete building business is currently constrained, despite its prevalent application in industrialized nations. The limited use may be ascribed to ambiguities about the determinants of effective implementation in this particular setting, as well as the dearth of extensive study in the realm of new building materials. The primary objective of this research is to assess and conceptualize the key determinants linked to the use of polyurea coatings in concrete building endeavors. Utilizing a quantitative research approach, a comprehensive literature analysis was conducted to identify a total of 21 probable success variables. The reliability of the questionnaire was established by the administration of a pilot survey, and afterwards, an exploratory factor analysis (EFA) was performed to enhance the clarity and precision of the underlying components. The researchers used structural modeling (SEM) approaches to develop a robust model using the primary data obtained from the questionnaire survey. The EFA revealed the presence of five unique constructs that have an impact on the effectiveness of polyurea coatings in concrete building projects. These constructions comprise several characteristics, including environmental considerations, functional requirements, protective properties, execution processes, and creative elements. The significance and relevance of this research are shown by the validation of the study's results using SEM. The study makes a valuable contribution towards the progression of polyurea coating use within the concrete building sector.
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Affiliation(s)
- Ahsan Waqar
- Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh, Perak, 32610, Malaysia
| | - Nasir Shafiq
- Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh, Perak, 32610, Malaysia
| | - Naraindas Bheel
- Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh, Perak, 32610, Malaysia
| | - Omrane Benjeddou
- Department of Civil Engineering, College of Engineering, Prince Sattam Bin Abdulaziz University, Alkharj, 16273, Saudi Arabia
| | - Nadhim Hamah Sor
- Civil Engineering Department, University of Garmian, Kalar 46021, Kurdistan Region, Iraq
- Department of Civil Engineering, Harran University, Sanlıurfa 63510, Turkey
| | - Jong Wan Hu
- Department of Civil and Environmental Engineering, Incheon National University, Incheon 22012, South Korea
- Incheon Disaster Prevention Research Center, Incheon National University, Incheon 22012, South Korea
| | - Hadee Mohammed Najm
- New Era and Development in Civil Engineering Research Group, Scientific Research Center, Al-Ayen University, Thi-Qar, Nasiriyah, 64001, Iraq
| | - Hamad R. Almujibah
- Department of Civil Engineering, College of Engineering, Taif University, P.O. Box 11099, Taif City 21974, Saudi Arabia
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Zhang C, Song S, Cao Q, Li J, Liu Q, Zhang S, Jian X, Weng Z. Improving the comprehensive properties of chitosan-based thermal insulation aerogels by introducing a biobased epoxy thermoset to form an anisotropic honeycomb-layered structure. Int J Biol Macromol 2023; 246:125616. [PMID: 37391003 DOI: 10.1016/j.ijbiomac.2023.125616] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 06/14/2023] [Accepted: 06/27/2023] [Indexed: 07/02/2023]
Abstract
Naturally-derived aerogels have attracted considerable attention owing to their good biocompatibility, biodegradability and sustainability, but their weak mechanical properties largely limit their applications in various fields. Herein, we proposed the use of a directional freeze-drying method to prepare an anisotropic honeycomb three-dimensional porous aerogel with water-soluble chitosan (CS) as a rigid skeleton and water-soluble biobased epoxy resin as cross-linked hard segments, which had low volume shrinkage and density of 13.9 % and 34.3 mg/cm3, respectively. The resultant aerogel had anisotropic mechanical properties, such as rigidity in the axial direction with a maximum axial modulus of 6.71 MPa, which was 51.6 times larger than that of the pure chitosan aerogel, demonstrating a good compressive elasticity in the radial direction. It also had anisotropic thermal management properties, with a lower thermal conductivity in the radial direction than in the axial direction, down to 0.029 W/mK. The introduction of biobased epoxy resin improved the overall thermal stability, flame retardancy, and increased the biomass content in the aerogel, reducing the carbon footprint of the material. This study paves the way for the construction of a special graded porous, structurally and functionally integrated thermal insulation aerogel, which is of great significance for the development of new thermal insulation materials.
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Affiliation(s)
- Cijian Zhang
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Liaoning Technology Innovation Center of High Performance Resin Materials, Department of Polymer Science & Engineering, Dalian University of Technology, Dalian 116024, PR China
| | - Shicong Song
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Liaoning Technology Innovation Center of High Performance Resin Materials, Department of Polymer Science & Engineering, Dalian University of Technology, Dalian 116024, PR China; Shanghai Space Propulsion Technology Research Institute, Huzhou 313000, PR China
| | - Qi Cao
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Liaoning Technology Innovation Center of High Performance Resin Materials, Department of Polymer Science & Engineering, Dalian University of Technology, Dalian 116024, PR China
| | - Jiahui Li
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Liaoning Technology Innovation Center of High Performance Resin Materials, Department of Polymer Science & Engineering, Dalian University of Technology, Dalian 116024, PR China
| | - Qian Liu
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Liaoning Technology Innovation Center of High Performance Resin Materials, Department of Polymer Science & Engineering, Dalian University of Technology, Dalian 116024, PR China
| | - Shouhai Zhang
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Liaoning Technology Innovation Center of High Performance Resin Materials, Department of Polymer Science & Engineering, Dalian University of Technology, Dalian 116024, PR China
| | - Xigao Jian
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Liaoning Technology Innovation Center of High Performance Resin Materials, Department of Polymer Science & Engineering, Dalian University of Technology, Dalian 116024, PR China
| | - Zhihuan Weng
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Liaoning Technology Innovation Center of High Performance Resin Materials, Department of Polymer Science & Engineering, Dalian University of Technology, Dalian 116024, PR China.
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Zhou Y, Li L, Yang C, Li Z, Chen Z, Wang H, Tuo X, Wu H. Highly Efficient Thermo-acoustic Insulating Aerogels Enabled by Resonant Cavity Engineering. ACS NANO 2023. [PMID: 37487002 DOI: 10.1021/acsnano.3c03347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
Lightweight, flexible, and noncombustible thermo-acoustic insulating (TAI) materials have great potential in vehicles, cold-chain transportation, and aerospace engineering, where weight and space savings are critical. However, the TAI capabilities of many commodities are hindered by the lack of diverse and reasonable resonant cavities with broadband and highly efficient acoustic responsiveness. This study demonstrates a layer-by-layer freeze-casting method for superelastic cellular aerogel construction from varied nanofibers and ice particulates with widely distributed resonant cavities from 0.5 to 300 μm. The method enabled the cumulative freezing of the nanofiber solution from one side to the other side, resulting in vertical pore channels with random holes across the entire freezing distance. The formed cellular networks of stable hinged ternary nanofiber membranes, functionalized as ultrathin nanofiber drums, exhibit strong resonances and efficiently dissipate sound waves in a broad frequency range. A high noise reduction coefficient of 0.65 at a frequency range of 63-6300 Hz and a low thermal conductivity of 0.026 W m-1 K-1 at room temperature was obtained. This work presents the bottom-up fabrication of high-performance TAI aerogels that are beneficial for practical energy-saving devices and buildings and broadband acoustic absorption applications.
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Affiliation(s)
- Yiqian Zhou
- National Engineering Research Center of Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Lei Li
- National Engineering Research Center of Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China
| | - Chong Yang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Ziwei Li
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Zekun Chen
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Haiyang Wang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Xinlin Tuo
- Key Laboratory of Advanced Materials (MOE), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Hui Wu
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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7
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A New Year's Message 2023. Polymers (Basel) 2023; 15:polym15030759. [PMID: 36772059 PMCID: PMC9919046 DOI: 10.3390/polym15030759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 02/01/2023] [Indexed: 02/05/2023] Open
Abstract
We wish you all happiness, health and progress in the new year [...].
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Wang C, Eisenreich F, Tomović Ž. Closed-Loop Recyclable High-Performance Polyimine Aerogels Derived from Bio-Based Resources. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2209003. [PMID: 36495005 DOI: 10.1002/adma.202209003] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 12/05/2022] [Indexed: 06/17/2023]
Abstract
Organic aerogels are an intriguing class of highly porous and ultralight materials which have found widespread applications in thermal insulation, energy storage, and chemical absorption. These fully cross-linked polymeric networks, however, pose environmental concerns as they are typically made from fossil-based feedstock and the recycling back to their original monomers is virtually impossible. In addition, organic aerogels suffer from low thermal stability and potential fire hazard. To overcome these obstacles and create next-generation organic aerogels, a set of polyimine aerogels containing reversible chemical bonds which can selectively be cleaved on demand is prepared. As precursors, different primary amines and cyclophosphazene derivatives made from bio-based reagents (vanillin and 4-hydroxybenzaldehyde) to elevate the thermal stability and reduce the environmental impact are used. The resulting polyimine aerogels exhibit low shrinkage, high porosity, large surface area, as well as pronounced thermal stability and flame resistance. More importantly, the aerogels show excellent recyclability under acidic conditions with high monomer recovery yields and purities. This approach allows for preparation of fresh aerogels from the retrieved building blocks, thus demonstrating efficient closed-loop recycling. These high-performance, recyclable, and bio-based polyimine aerogels pave the way for advanced and sustainable superinsulating materials.
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Affiliation(s)
- Changlin Wang
- Polymer Performance Materials Group, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, MB, 5600, The Netherlands
| | - Fabian Eisenreich
- Polymer Performance Materials Group, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, MB, 5600, The Netherlands
| | - Željko Tomović
- Polymer Performance Materials Group, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, MB, 5600, The Netherlands
- Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, MB, 5600, The Netherlands
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9
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Luo Y, Zhou Y, Bai X, Cai X, Luo X, Deng X, Wu D. Preparation and characterization of toughened polyurea aerogels incorporating linear long‐chain in the structure. POLYM ENG SCI 2023. [DOI: 10.1002/pen.26260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Yumei Luo
- School of New Energy and Materials Southwest Petroleum University Chengdu People's Republic of China
| | - Yi Zhou
- School of New Energy and Materials Southwest Petroleum University Chengdu People's Republic of China
| | - Xiaodong Bai
- School of New Energy and Materials Southwest Petroleum University Chengdu People's Republic of China
| | - Xuetong Cai
- School of New Energy and Materials Southwest Petroleum University Chengdu People's Republic of China
| | - Xiuling Luo
- School of New Energy and Materials Southwest Petroleum University Chengdu People's Republic of China
| | - Xifeng Deng
- School of New Energy and Materials Southwest Petroleum University Chengdu People's Republic of China
| | - Di Wu
- School of New Energy and Materials Southwest Petroleum University Chengdu People's Republic of China
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Georgiou E, Raptopoulos G, Anastopoulos I, Giannakoudakis DA, Arkas M, Paraskevopoulou P, Pashalidis I. Uranium Removal from Aqueous Solutions by Aerogel-Based Adsorbents-A Critical Review. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13020363. [PMID: 36678117 PMCID: PMC9866664 DOI: 10.3390/nano13020363] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 01/03/2023] [Accepted: 01/09/2023] [Indexed: 06/12/2023]
Abstract
Aerogels are a class of lightweight, nanoporous, and nanostructured materials with diverse chemical compositions and a huge potential for applications in a broad spectrum of fields. This has led the IUPAC to include them in the top ten emerging technologies in chemistry for 2022. This review provides an overview of aerogel-based adsorbents that have been used for the removal and recovery of uranium from aqueous environments, as well as an insight into the physicochemical parameters affecting the adsorption efficiency and mechanism. Uranium removal is of particular interest regarding uranium analysis and recovery, to cover the present and future uranium needs for nuclear power energy production. Among the methods used, such as ion exchange, precipitation, and solvent extraction, adsorption-based technologies are very attractive due to their easy and low-cost implementation, as well as the wide spectrum of adsorbents available. Aerogel-based adsorbents present an extraordinary sorption capacity for hexavalent uranium that can be as high as 8.8 mol kg−1 (2088 g kg−1). The adsorption data generally follow the Langmuir isotherm model, and the kinetic data are in most cases better described by the pseudo-second-order kinetic model. An evaluation of the thermodynamic data reveals that the adsorption is generally an endothermic, entropy-driven process (ΔH0, ΔS0 > 0). Spectroscopic studies (e.g., FTIR and XPS) indicate that the adsorption is based on the formation of inner-sphere complexes between surface active moieties and the uranyl cation. Regeneration and uranium recovery by acidification and complexation using carbonate or chelating ligands (e.g., EDTA) have been found to be successful. The application of aerogel-based adsorbents to uranium removal from industrial processes and uranium-contaminated waste waters was also successful, assuming that these materials could be very attractive as adsorbents in water treatment and uranium recovery technologies. However, the selectivity of the studied materials towards hexavalent uranium is limited, suggesting further developments of aerogel materials that could be modified by surface derivatization with chelating agents (e.g., salophen and iminodiacetate) presenting high selectivity for uranyl moieties.
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Affiliation(s)
- Efthalia Georgiou
- Radioanalytical and Environmental Chemistry Group, Department of Chemistry, University of Cyprus, P.O. Box 20537, Nicosia CY-1678, Cyprus
| | - Grigorios Raptopoulos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece
| | - Ioannis Anastopoulos
- Department of Agriculture, University of Ioannina, UoI Kostakii Campus, 47100 Arta, Greece
| | | | - Michael Arkas
- Demokritos National Centre for Scientific Research, Institute of Nanoscience and Nanotechnology, 15771 Athens, Greece
| | - Patrina Paraskevopoulou
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece
| | - Ioannis Pashalidis
- Radioanalytical and Environmental Chemistry Group, Department of Chemistry, University of Cyprus, P.O. Box 20537, Nicosia CY-1678, Cyprus
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11
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Tang J, Ren J, Zhao Z, Kong Y, Shen X. Partially reduced TiO 2 aerogel as a catalyst of oxygen reduction reaction in alkaline. CHEM LETT 2022. [DOI: 10.1246/cl.220210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jinqiong Tang
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China
- Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, PR China
| | - Jian Ren
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China
- Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, PR China
| | - Zhiyang Zhao
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China
- Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, PR China
| | - Yong Kong
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China
- Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, PR China
| | - Xiaodong Shen
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China
- Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, PR China
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