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摘要
CO2可逆溶剂是最新开发的纤维素溶解体系,不仅能实现纤维素的高效衍生化溶解,还可实现其改性及加工应用,为高效利用纤维素提供了新的平台。利用该体系溶解纤维素并制成水凝胶后,进行吡咯的原位聚合并实现其与纤维素的复合,通过冷冻干燥制备获得聚吡咯复合纤维素气凝胶材料。通过傅里叶变换红外光谱、扫描电镜、X射线衍射、水接触角和光热转换及水蒸发性能测试,对所得光热气凝胶的化学结构、亲水性和光热转换性能进行了表征。结果表明:通过将纤维素水凝胶先后浸泡吡咯与三氯化铁溶液,可实现吡咯的原位聚合并与纤维素均匀复合。所得光热气凝胶具有亲水多孔结构,有利于水分的吸收与输运。在一个太阳光强度照射下,光热气凝胶可在6min内从约30℃升高到约60℃,平均升温速率达5℃/min。置于水中,可在1h内将水温升高超过10℃,并实现每小时1.71kg/m2的水蒸发速率,有望应用于太阳能海水淡化。
Abstract
As a novel cellulose dissolution system,CO2 reversible solvent can not only realize the efficient derivatization dissolution of cellulose,but also realize its modification and processing application,providing a new platform for cellulose utilization.In this study,this solvent was used to dissolve cellulose and prepare hydrogels.Subsequently,polypyrrole was in-situ polymerized and compounded with cellulose,after which polypyrrole composite cellulose aerogel was prepared by freeze-drying.The chemical structure,hydrophilicity and photothermal conversion properties of the prepared aerogel were characterized by Fourier transform infrared,scanning electron microscopy,X-ray diffraction,water contact angle,photothermal conversion and water evaporation test.The results showed that the in-situ polymerization of pyrrole and its homogeneous compounding with cellulose could be achieved by consecutively immersing the cellulose hydrogel in the solution of pyrrole and ferric chloride.The prepared photothermal aerogel had a hydrophilic porous structure,which was conducive to the absorption and transport of water.Under the irradiation of one sunlight intensity,the temperature of photothermal aerogel could rise from about 30℃ to about 60℃ within 6 min,and the average temperature rise rate could reach 5℃/min.Moreover,when placed in water,within 1h,the temperature of the water could be raised for over 10℃ and result in a water evaporation rate of 1.71kg/m2,under the irradiation of one sunlight intensity.This photothermal aerogel was therefore expected to be applied in solar desalination.
关键词
纤维素
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二氧化碳
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聚吡咯
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气凝胶
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光热转换
Key words
cellulose
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carbon dioxide
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polypyrrole
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aerogel
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photothermal conversion
CO2可逆溶剂中原位复合聚吡咯制备纤维素基光热转换气凝胶材料研究[J].
化工新型材料, 2023, 51(11): 151-156 DOI:10.19817/j.cnki.issn1006-3536.2023.11.030
[1] Klemm D,Heublein B,Fink H P,et al.Cellulose:fascinating biopolymer and sustainable raw material[J].Angewandte Chemie International Edition,2005,44(22):3358-3393.
[2] 周金平,甘蔚萍,张俐娜.均相体系中纤维素化学改性研究概述[J].中国科学-化学,2012,42(5):591-605.
[3] Zhang J,Wu J,Yu J,et al.Application of ionic liquids for dissolving cellulose and fabricating cellulose-based materials:state of the art and future trends[J].Materials Chemistry Frontiers,2017,1(7):1273-1290.
[4] Wang S,Lu A,Zhang L.Recent advances in regenerated cellulose materials[J].Progress in Polymer Science,2016,53:169-206.
[5] Rosenau T,Potthast A,Sixta H,et al.The chemistry of side reactions and byproduct formation in the system NMMO/cellulose (Lyocell process)[J].Progress in Polymer Science,2001,26(9):1763-1837.
[6] Jessop P G,Heldebrant D J,Li X,et al.Reversible nonpolar to polar solvent[J].Nature,2005,436:1102.
[7] Zhang Q,Oztekin N S,Barrault J,et al.Activation of microcrystalline cellulose in a CO2-based switchable system[J].ChemSusChem,2013,6(4):593-596.
[8] Xie H,Yu X,Yang Y,et al.Capturing CO2 for cellulose dissolution[J].Green Chemistry,2014,16(5):2422-2427.
[9] Lu S,Li J,Liu F,et al.Impact of DBU on the synthesis of cellulose-graft-poly(L-lactide) copolymer in CO2 switchable solvent with different grafting strategies[J].Polymer (Guildf),2021,229:124020.
[10] Wolfs J,Meier M A R.A more sustainable synthesis approach for cellulose acetate using the DBU/CO2 switchable solvent system[J].Green Chemistry,2021,23(12):4410-4420.
[11] Cao Q,Dai J,Bao X,et al.Preparation of cellulose-based fluorescent materials as coating pigment by use of DMSO/DBU/CO2 system[J].Cellulose,2021,28(16):10373-10384.
[12] Bao X,Wang C,Zhang Z,et al.Wet spinning to prepare filaments from three cellulose carbonated derivatives:synthesis,characterization and filament properties[J].Carbohydrate Polymer Technologies and Applications,2021,2:100099.
[13] Li J,Lu S,Liu F,et al.Structure and properties of regenerated cellulose fibers based on dissolution of cellulose in a CO2 switchable solvent[J].ACS Sustainable Chemistry & Engineering,2021,9(13):4744-4754.
[14] Kirchberg A,Meier M A R.Regeneration of cellulose from a switchable ionic liquid:toward more sustainable cellulose fibers[J].Macromolecular Chemistry and Physics,2021,222(6):2000433.
[15] Pan B,Huang J,Chen L A I,et al.Preparation of corn cellulose films with controllable mechanical property by using switchable CO2/DBU/DMSO system[J].Journal of Polymer Materials,2020,37(1):17-27.
[16] Onwukamike K N,Lapuyade L,Maillé L,et al.Sustainable approach for cellulose aerogel preparation from the DBU-CO2 switchable solvent[J].ACS Sustainable Chemistry & Engineering,2019,7(3):3329-3338.
[17] Lu J,Lu S,Cao Q,et al.Dual modification of cellulose with esterification and carbonation in DMSO/DBU/CO2 system as fluorescent additive for pH detection[J].Carbohydrate Research,2022,520:108630.
基金资助
宁波市自然科学基金重点项目(2021J196);宁波市2025科技创新重大专项(2022Z160);国家重点研发计划项目(2021YFB3700300)
