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Han X, Liu W, Zu L, Wu W, Xie J, You D, Du M, Guo T. In situ surface turbidity sensor based on localized light scattering from tilted fiber Bragg gratings. OPTICS LETTERS 2024; 49:650-653. [PMID: 38300081 DOI: 10.1364/ol.512335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 12/21/2023] [Indexed: 02/02/2024]
Abstract
We propose a compact fiber-optic sensor for in situ and continuous turbidity monitoring, based on surface optical scattering of polarized evanescent waves from targeted particles. The sensor is composed of a tilted fiber Bragg grating (TFBG) packaged inside a microfluidic capillary. The transmission spectrum of the TFBG provides a fine comb of narrow cladding resonances that are highly sensitive to the turbidity due to the localized light scattering of polarized evanescent waves from the microparticles near the fiber surface (as opposed to traditional bulk/volumetric turbidity measurement). We also propose a transmission spectral area interrogation method and quantify the repeatable correlation between the surface turbidity and the optical spectral area response. We show that the maximum sensitive turbidity response is achieved when the wavelength of the sensing cladding resonance matches the size of surrounding solid particles.
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Wang W, Zhang C, He J, Peng W, Cao Y, Liu J, Huang Y, Fan G. Chitosan-induced self-assembly of montmorillonite nanosheets along the end-face for methylene blue removal from water. Int J Biol Macromol 2023; 227:952-961. [PMID: 36565829 DOI: 10.1016/j.ijbiomac.2022.12.206] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Revised: 12/16/2022] [Accepted: 12/17/2022] [Indexed: 12/24/2022]
Abstract
In this study, chitosan-induced self-assembly of montmorillonite nanosheets (MMTNS) along the end-face to form the layered and porous structured composite with high adsorption capacity towards MB dye wastewater was investigated. The self-assembly process was driven by the hydrogen-bond interaction among -OH groups distributed along the end-face of MMTNS and -NH2 groups on chitosan (CS) chain, which finally formed the infinite two-dimensional lamellae. This technology remained the exposed adsorption sites on MMTNS surface, and solved the separation issue of spent MMTNS from water, making MMTNS/CS an excellent adsorption material for macromolecular MB dye. The maximum adsorption capacity of MMTNS/CS towards MB reached 243 mg/g, which was achieved via the Na+- exchange, hydrogen-bond and n-π stacking interactions with MB molecules. This work aimed at breaking through the bottleneck of small adsorption capacity of traditional MMT adsorbents, solving the problem of solid-liquid separation of nanosheets, and effectively reducing the adsorption cost, which might guide an important direction for adsorption material design and development in the future.
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Affiliation(s)
- Wei Wang
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, Henan 450001, PR China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, PR China; Longmen laboratory, Luoyang, Henan 471000, PR China
| | - Chongyu Zhang
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, Henan 450001, PR China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Jianyong He
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Weijun Peng
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, Henan 450001, PR China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, PR China.
| | - Yijun Cao
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, Henan 450001, PR China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, PR China.
| | - Jiang Liu
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Yukun Huang
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Guixia Fan
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, Henan 450001, PR China
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Gao R, Zhao Y, Chen L, Zhang T, Miao Y, Zhou Y, Song S. Effect of exfoliation degree on the performance of montmorillonite nanosheets. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Tavakoli A, Rahimi K, Saghandali F, Scott J, Lovell E. Nanofluid preparation, stability and performance for CO 2 absorption and desorption enhancement: A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 313:114955. [PMID: 35405543 DOI: 10.1016/j.jenvman.2022.114955] [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: 08/23/2021] [Revised: 02/03/2022] [Accepted: 03/20/2022] [Indexed: 06/14/2023]
Abstract
In recent years, the importance of capturing CO2 has increased due to the necessity of minimizing climate change and the detrimental effects of CO2 emissions from industrial processes. CO2 absorption, as one of the most mature carbon capture technologies, has been improved by introducing nanosized particles into liquid absorbents. Nanofluids have been the subject of interest in many studies recently due to their tremendous impact on absorption. This review comprehensively examines the CO2 absorption behavior for nanofluids through the investigation of different absorption systems. Potential mechanisms for improving the absorption/regeneration performance of nanoabsorbents as well as the synergistic effects of physicochemical properties of nanofluids, such as viscosity and density on CO2 capture behavior, are reviewed. Nanofluid enhancement factors in terms of absorption rate and capacity towards CO2 are also compiled. Mathematical models, which have been proposed for calculating mass transfer coefficient and mass diffusivity, are comprehensively outlined. The paper discusses conventional methods for nanofluid preparation affecting the physicochemical properties of nanofluids. Strategies for enhancing nanofluid stability, as well as approaches to examine their stability are discussed. Finally, nanoparticle concentration, types and size of them, and selection of the base liquid absorbent as the key factors influencing the CO2 removal process by nanofluids, are considered in this paper, as well.
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Affiliation(s)
- Atefeh Tavakoli
- School of Chemical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran
| | - Keivan Rahimi
- School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia
| | - Farzin Saghandali
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
| | - Jason Scott
- School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia.
| | - Emma Lovell
- School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia
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Chen XX, Liu JH, Kurniawan A, Li KJ, Zhou CH. Inclusion of organic species in exfoliated montmorillonite nanolayers towards hierarchical functional inorganic-organic nanostructures. SOFT MATTER 2021; 17:9819-9841. [PMID: 34698330 DOI: 10.1039/d1sm00975c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Montmorillonite (Mt) can readily undergo spontaneous delamination or exfoliation into nanolayers by various physical and chemical processes, which allow various strategies to engineer hierarchical functional inorganic-organic nanostructures. This review aims to discuss the recent progress in the liquid-phase exfoliation of Mt into individual nanolayers and the inclusion chemistry of functional organic species, ions, or molecules into the exfoliated Mt nanolayers to produce hierarchical functional inorganic-organic nanostructures. The exfoliation methods include mechanical force, ultrasonication, and intercalation-assisted exfoliation. Techniques for quickly assessing the quality of the exfoliated Mt nanolayers are still needed. Layer-by-layer (LbL) deposition, template, and evaporation-induced inclusions are examined to fabricate hierarchical Mt-organic species nanocomposites with unique functionalities and properties. The nanocomposites can be produced as multilayered porous films, brick-and-mortar coatings, hydrogels with a house-of-cards structure, core-shell materials, and hollow and mesoporous spherical nanocomposites, which exhibit significant potential for adsorption, catalysis, targeted delivery and controlled drug release, highly sensitive sensors, flame retardant coatings, and thermal energy storage and release (i.e. phase change materials). Finally, the challenges and prospects for the future development of hierarchical nanocomposites of exfoliated Mt nanolayers and organic species, particularly in hierarchical supramolecular nanostructured composites, are highlighted.
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Affiliation(s)
- Xi Xi Chen
- Research Group for Advanced Materials & Sustainable Catalysis (AMSC), State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China.
- Qing Yang Institute for Industrial Minerals, You Hua, Qing Yang, Chi Zhou 242804, China
| | - Jia Hui Liu
- Research Group for Advanced Materials & Sustainable Catalysis (AMSC), State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China.
- Qing Yang Institute for Industrial Minerals, You Hua, Qing Yang, Chi Zhou 242804, China
| | - Alfin Kurniawan
- Research Group for Advanced Materials & Sustainable Catalysis (AMSC), State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China.
| | - Ke Jin Li
- Research Group for Advanced Materials & Sustainable Catalysis (AMSC), State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China.
| | - Chun Hui Zhou
- Research Group for Advanced Materials & Sustainable Catalysis (AMSC), State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China.
- Qing Yang Institute for Industrial Minerals, You Hua, Qing Yang, Chi Zhou 242804, China
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Exfoliation of montmorillonite using a simple and low-cost heating/gasifying method. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-01772-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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