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Ai S, Huang Z, Yu W, Huang C. Efficient dissolution of cellulose in slow-cooling alkaline systems and interacting modes between alkali and urea at the molecular level. Carbohydr Res 2024; 536:109054. [PMID: 38350405 DOI: 10.1016/j.carres.2024.109054] [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: 01/02/2024] [Revised: 02/02/2024] [Accepted: 02/08/2024] [Indexed: 02/15/2024]
Abstract
The dissolution of microcrystalline cellulose (MCC) in a urea-NaOH system is beneficial for its mechanical processing. The apparent MCC solubility was greatly improved to 14 wt% under a slow-cooling condition with a cooling rate of -0.3 °C/min. The cooling curve or thermal history played a crucial role in the dissolution process. An exotherm (-54.7 ± 3 J/g MCC) was detected by DSC only under the slow-cooling condition, and the cryogenic dissolution of MCC was attributed to the exothermic interaction between MCC and solvent. More importantly, the low cooling rate promoted the dissolution of MCC by providing enough time for the diffusion of OH- and urea into MCC granules at higher temperatures. The Raman spectral data showed that the intramolecularly and intermolecularly hydrogen bonds in cellulose were cleaved by NaOH and urea, respectively. XPS and solid-state 13C NMR results showed that hydrogen bonds were generated after dissolution, and a dual-hydrogen-bond binding mode between urea and cellulose was confirmed by DFT calculations. Both the decrease of enthalpy and increase of entropy dominated the spontaneity of MCC dissolution, and that is the reason for the indispensability of cryogenic environment. The high apparent solubility of MCC in the slow-cooling process and the dissolution mechanism are beneficial for the studies on cellulose modification and mechanical processing.
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Affiliation(s)
- Shuo Ai
- College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China.
| | - Zhenhua Huang
- College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Wanguo Yu
- College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China.
| | - Chengdu Huang
- College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
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Tang X, Yu C, Lei Y, Wang Z, Wang C, Wang J. A novel chitosan-urea encapsulated material for persulfate slow-release to degrade organic pollutants. JOURNAL OF HAZARDOUS MATERIALS 2022; 426:128083. [PMID: 34923382 DOI: 10.1016/j.jhazmat.2021.128083] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/26/2021] [Accepted: 12/11/2021] [Indexed: 06/14/2023]
Abstract
A novel eco-friendly material (CS-U@PS) for persulfate slow-release to effectively degrade organic pollutants (methyl orange and pyrene) was synthesized using chitosan and urea as the encapsulated framework materials via an emulsion cross-linking method for the first time. The obtained CS-U@PS exhibits spherical shapes with a uniform size of approximately 2-3 µm according to the particle-size distribution and SEM image results. The slow-release mechanism was proposed through a kinetics model study and the Ritger-Peppas model fit well (r2 = 0.9699) to indicate that the slow-release process is non-Fickian diffusion. The influences of urea and PS dosages and oxidative conditions on methyl orange degradation were studied, and all the results suggested that urea played an important role in PS slow-release and can also catalyze the activation of PS by iron to further produce radicals and improve the removal efficiency of pollutants. A pyrene removal rate of 90.53% was achieved in aqueous solutions and an above 80% removal rate was obtained in weakly acidic or neutral soil environments by CS-U@PS activated by Fe2+ with citric acid as the chelating agent. Therefore, the fabricated slow-release oxidation materials exhibit application potential for the remediation of organic polluted groundwater and soil.
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Affiliation(s)
- Xuejiao Tang
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Urban Environmental Pollution Diagnosis and Remediation Technology Engineering Center, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, PR China.
| | - Congya Yu
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Urban Environmental Pollution Diagnosis and Remediation Technology Engineering Center, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, PR China
| | - Yuanyuan Lei
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Urban Environmental Pollution Diagnosis and Remediation Technology Engineering Center, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, PR China
| | - Zhen Wang
- School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, PR China
| | - Cuiping Wang
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Urban Environmental Pollution Diagnosis and Remediation Technology Engineering Center, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, PR China
| | - Jingang Wang
- School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, PR China.
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Zhang H, Kong M, Jiang Q, Hu K, Ouyang M, Zhong F, Qin M, Zhuang L, Wang G. Chitosan membranes from acetic acid and imidazolium ionic liquids: Effect of imidazolium structure on membrane properties. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117209] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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4
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Hu K, Kong M, Qin M, Zeng J, Ai B, Zhang J, Zhang H, Zhong F, Wang G, Zhuang L. Experimental and theoretical studies of chitosan dissolution in ionic liquids: Contribution ratio effect of cations and anions. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115762] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Wu J, Wu X, Wu R, Wang Z, Tan N. Research for improvement on the extract efficiency of lignans in traditional Chinese medicines by hybrid ionic liquids: As a case of Suhuang antitussive capsule. ULTRASONICS SONOCHEMISTRY 2021; 73:105539. [PMID: 33813347 PMCID: PMC8053792 DOI: 10.1016/j.ultsonch.2021.105539] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 03/15/2021] [Accepted: 03/20/2021] [Indexed: 05/10/2023]
Abstract
Recently, efficient extraction of natural products from traditional Chinese medicines (TCMs) by green solvents is deemed an essential area of green technology and attracts extensive attentions. In this work, a green protocol for simultaneous ultrasonic-extraction of the native compounds with different polarities of TCMs by using a hybrid ionic liquids (HILs)-water system was reported for the first time. As a case study, three superior ILs (1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]), 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]), and 1-allyl-3-methylimidazolium chloride ([AMIM]Cl)) were chosen as the compositions of the HILs system, and the TCMs Suhuang antitussive capsule (SH) containing different-polarity lignans was selected. Primarily, an ultra-performance liquid chromatography coupled to triple quadrupole tandem mass spectrometry (UPLC-QqQ-MS/MS) method in the multiple reaction monitoring (MRM) mode was established for qualitative and quantitative analysis of 18 lignans. After majorization by uniform design experiment, the HILs prepared with [AMIM]Cl, [EMIM][BF4], and [EMIM][OAc] at a volume ratio of 1:5:5 could simultaneously extract multi-polarity lignans compared to single IL. Subsequently, the conditions of ultrasonic extraction employing with HILs and traditional organic solvent were optimized by the response surface methodology, respectively. The results indicated that the extract efficiency of the HILs system for target compounds was significantly improved compared with the traditional organic solvent-extraction, i.e. the content of total lignans in ethanol system was up to 47 mg/g, while that in the HILs system was up to 69 mg/g, with an increasing of 47%. Additionally, 1H-NMR and 13C-NMR spectra were used to characterize the hydrogen-bond interactions in the HILs-lignan mixtures. Extraction with the HILs in TCMs is a new application schema of ILs, which not only avoids the use of volatile toxic organic solvents, but also shows the potential to be comprehensively applied for the extraction of bioactive compounds from TCMs.
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Affiliation(s)
- Jiajia Wu
- State Key Laboratory of Natural Medicines, Department of TCMs Pharmaceuticals, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, PR China
| | - Xingdong Wu
- State Key Laboratory of Natural Medicines, Department of TCMs Pharmaceuticals, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, PR China
| | - Rongrong Wu
- State Key Laboratory of Natural Medicines, Department of TCMs Pharmaceuticals, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, PR China
| | - Zhen Wang
- State Key Laboratory of Natural Medicines, Department of TCMs Pharmaceuticals, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, PR China.
| | - Ninghua Tan
- State Key Laboratory of Natural Medicines, Department of TCMs Pharmaceuticals, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, PR China.
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Tan X, Wang G, Zhong L, Xie F, Lan P, Chi B. Regeneration behavior of chitosan from ionic liquid using water and alcohols as anti-solvents. Int J Biol Macromol 2020; 166:940-947. [PMID: 33152361 DOI: 10.1016/j.ijbiomac.2020.10.251] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 10/19/2020] [Accepted: 10/30/2020] [Indexed: 10/23/2022]
Abstract
While ionic liquids (ILs) have been considered as effective and "green" solvents for biopolymer processing, regeneration of IL-dissolved biopolymers could largely impact biopolymer structure and properties. This study indicates that the reconstitution of chitosan structure during regeneration from 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]) depends on anti-solvent (water, methanol or ethanol) largely. Irrespective of anti-solvent, the chitosan chemical structure was not varied by dissolution or regeneration. With water, the regenerated chitosan had the highest crystallinity index of 54.18%, followed by those with methanol (35.07%) and ethanol (25.65%). Water as an anti-solvent could promote chitosan chain rearrangement, leading to the formation of an ordered aggregated structure and crystallites. Density functional theory (DFT) simulation indicates that the number of hydrogen bonds formed between anti-solvents and [Emim][OAc] was in the order of water > methanol > ethanol. With water used for regeneration, the aggregation and rearrangement of chitosan chains occurred more easily.
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Affiliation(s)
- Xiaoyan Tan
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing, Jiangsu 211816, China
| | - Guowei Wang
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing, Jiangsu 211816, China
| | - Lei Zhong
- Guangxi Key Laboratory for Polysaccharide Materials and Modification, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530008, China
| | - Fengwei Xie
- International Institute for Nanocomposites Manufacturing (IINM), WMG, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Ping Lan
- Guangxi Key Laboratory for Polysaccharide Materials and Modification, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530008, China
| | - Bo Chi
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing, Jiangsu 211816, China.
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7
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Theoretical and experimental studies of ionic liquid-urea mixtures on chitosan dissolution: Effect of cationic structure. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113918] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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8
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Sun Y, Qing M, Chen L, Liu J, Zhong F, Jiang P, Wang G, Zhuang L. Chitosan dissolution with sulfopropyl imidazolium Brönsted acidic ionic liquids. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111533] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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9
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Li L, Yu H, Xu J, Zhao S, Liu Z, Li Y. Rare earth element, Sm, modified graphite phase carbon nitride heterostructure for photocatalytic hydrogen production. NEW J CHEM 2019. [DOI: 10.1039/c8nj05619f] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new type of Sm2O3@Ni7S6/g-C3N4 composite has high photocatalytic activity and stability.
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Affiliation(s)
- Lingjiao Li
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
| | - Hai Yu
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
| | - Jing Xu
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
- Key Laboratory of Chemical Engineering & Technology
| | - Sheng Zhao
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
| | - Zeying Liu
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
| | - Yanru Li
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
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