海藻酸钠/羟丙基甲基纤维素/氧化石墨烯复合气凝胶的制备及性能评价
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摘要
以海藻酸钠和羟丙基甲基纤维素等天然高分子化合物为原材料,通过引入氧化石墨烯,采用原位凝胶化方法制备了海藻酸钠/羟丙基甲基纤维素/氧化石墨烯新型气凝胶材料。研究结果表明,制备的气凝胶具有均匀多孔的空间结构,而且继承了氧化石墨烯材料典型的分层结构; XRD分析表明氧化石墨烯以氢键连接的方式均匀地分散在海藻酸钠体系中;以重金属Cu2+的吸附量为指标,气凝胶对铜离子的吸附量先急剧增加后趋于平衡;通过对经验方程的拟合分析,气凝胶对Cu2+吸附更遵循Freundlich吸附过程和准二级动力学模型,属于化学吸附。
Sodium alginate and hydroxypropyl methyl cellulose were used for the preparation of aerogels by introducing graphene oxide.The composite aerogel materials of sodium alginate/hydroxypropyl methylcellulose/graphene oxide were prepared by in-situ gelation method. The results showed that the aerogels possessed the uniform porous structure and also inherited the hierarchical structure of graphene molecule. It was noted that there was no characteristic diffraction peaks of graphene found in XRD spectra of composite materials,which proved that graphene were uniformly dispersed in the alginate system by hydrogen bonds. The adsorption capacity of heavy metal Cu2 +was taken as index. The copper ion adsorption quantity increased sharply first and then reached equilibrium. By fitting the empirical equation,the adsorption behavior of Cu2 +was more belonged to the chemical adsorption of Freundlich adsorption process and pseudo-second-order kinetic model.
Sodium alginate and hydroxypropyl methyl cellulose were used for the preparation of aerogels by introducing graphene oxide.The composite aerogel materials of sodium alginate/hydroxypropyl methylcellulose/graphene oxide were prepared by in-situ gelation method. The results showed that the aerogels possessed the uniform porous structure and also inherited the hierarchical structure of graphene molecule. It was noted that there was no characteristic diffraction peaks of graphene found in XRD spectra of composite materials,which proved that graphene were uniformly dispersed in the alginate system by hydrogen bonds. The adsorption capacity of heavy metal Cu2 +was taken as index. The copper ion adsorption quantity increased sharply first and then reached equilibrium. By fitting the empirical equation,the adsorption behavior of Cu2 +was more belonged to the chemical adsorption of Freundlich adsorption process and pseudo-second-order kinetic model.
引文
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[2] ROSALIA R E,MIKE R,FRANCESCO D R,et al. Alginate aerogels as adsorbents of polar molecules from liquid hydrocarbons:Hexanol as probe molecule[J]. Carbohydrate Polymers,2009,75(1):52-57.
[3] SHANG K,LIAO W,WANG J,et al. Nonflammable alginate nanocomposite aerogels prepared by a simple freeze-drying and post-cross-linking method[J]. ACS Applied Materials&Interfaces,2016,8(1):643-650.
[4] JIAO C L,XIONG J Q,TAO J,et al. Sodium alginate/graphene oxide aerogel with enhanced strength-toughness and its heavy metal adsorption study[J]. International Journal of Biological Macromolecules,2016,83:133-141.
[5] YUAN X,WEI Y,CHEN S,et al. Bio-based graphene/sodium alginate aerogels for strain sensors[J]. RSC Advance,2016,6(68):64056-64064.
[6] PAREDES J I,VILLAR-RODIL S,MARTíNEZ-ALONSO A,et al.Graphene oxide dispersions in organic solvents[J]. Langmuir,2008,24(19):10560-10564.
[7] LAWRIE G,KEEN I,DREW B,et al. Interactions between alginate and chitosan biopolymers characterized using FTIR and XPS[J]. Biomacromolecules,2007,8(8):2533-2541.
[8] ALGOTHMI W M,BANDARU N M,YU Y,et al. Alginategraphene oxide hybrid gel beads:An efficient copper adsorbent material[J]. Journal of colloid and interface science,2013,397:32-38.
[9] SUN L,FUGETSU B. Graphene oxide captured for green use:Influence on the structures of calcium alginate and macroporous alginic beads and their application to aqueous removal of acridine orange[J]. Chemical Engineering Journal,2014,240:565-573.
[10] ZHANG L,WANG Z,XU C,et al. High strength graphene oxide/polyvinyl alcohol composite hydrogels[J]. Journal of Materials Chemistry,2011,21(28):10399-10406.
[11] LANGMUIR I. The adsorption of gases on plane surfaces of glass,mica and platinum[J]. Journal of the American Chemical Society,1918,40(9):1361-1403.
[12] FREUNDLICH H M. Over the adsorption in solution[J]. Journal of Physical Chemistry,1906,57:385-470.
[13] FAN L,LUO C,SUN M,et al. Preparation of novel magnetic chitosan/graphene oxide composite as effective adsorbents toward methylene blue[J]. Bioresource Technology,2012,114:703-706.
[14] HAMEED B,EL-KHAIARY M. Malachite green adsorption by rattan sawdust:Isotherm,kinetic and mechanism modeling[J].Journal of Hazardous Materials,2008,159(2-3):574-579.
[15] ZHENG H,LIU D,ZHENG Y,et al. Sorption isotherm and kinetic modeling of aniline on Cr-bentonite[J]. Journal of Hazardous Materials,2009,167(1-3):141-147.
[16] HO Y S,MCKAY G. Pseudo-second-order model for sorption processes[J]. Process Biochem,1999,34(5):451-465.
[17] WU F C,TSENG R. L,JUANG R. S. Kinetic modeling of liquidphase adsorption of reactive dyes and metal ions on chitosan[J].Water Research,2001,35(3):613-618.