香蕉纤维-壳聚糖水凝胶的制备及其吸附重金属离子性能研究
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摘要
以香蕉纤维、壳聚糖为原料,离子液体1-烯丙基-3-甲基咪唑氯盐[Amim]Cl为溶解系统,在香蕉纤维网状结构中引入壳聚糖亲水性大分子基团,构建香蕉纤维-壳聚糖复合水凝胶,分析其重金属吸附能力。结果表明:在香蕉纤维大分子骨架上引入-NH2亲水性基团,成功构筑香蕉纤维-壳聚糖复合水凝胶,且表面分布不规则空隙结构;香蕉纤维壳聚糖复合水凝胶在660 min时失水率达到94.36%;当水凝胶的用量为5 g/L时,对Cu~(2+)、Cd~(2+)、Pb~(2+)的去除率分别为98.35%、79.22%和77.3%,40 min时可达吸附平衡;吸附过程用准二级动力学模型来描述更为适当,其对重金属离子的吸附作用以化学吸附为主;香蕉纤维-壳聚糖水凝胶具有良好的重金属吸附性能,对Cu~(2+)的吸附作用更为显著。
Banana fiber and chitosan were dissolved in lonic liquid [Amim]Cl for a clear and transparent solution. In the solution chitosan macromolecular group and banana fiber molecular chain unit were connected through each other to construct the complex hydrogel. The hydrogel structure were characterized and the heavy metal ion adsorption properties were analyzed in this paper. And the results were shown that: the composite hydrogel with banana fiber and chitosan was successfully prepared; The hydrophilic functional groups(-NH2) from chitosan was leaded in the network structure of banana fiber; Irregular voids were distributed at the surface of the hydrogel. Driage of the composite hydrogel was 94.36%at 660 min. When the dosage of the hydrogel was 5 g/L,the removal rate of Cu~(2+),Cd~(2+)and Pb~(2+)were98.35%,79.22% and 77.3% respectively,and attained adsorption equilibrium in 40 min. The adsorption mechanism is chemical adsorption based by level 2 adsorption kinetics model. The banana fiber and chitosan composite hydrogel has good adsorption properties for heavy metals ions and especially for Cu~(2+).
Banana fiber and chitosan were dissolved in lonic liquid [Amim]Cl for a clear and transparent solution. In the solution chitosan macromolecular group and banana fiber molecular chain unit were connected through each other to construct the complex hydrogel. The hydrogel structure were characterized and the heavy metal ion adsorption properties were analyzed in this paper. And the results were shown that: the composite hydrogel with banana fiber and chitosan was successfully prepared; The hydrophilic functional groups(-NH2) from chitosan was leaded in the network structure of banana fiber; Irregular voids were distributed at the surface of the hydrogel. Driage of the composite hydrogel was 94.36%at 660 min. When the dosage of the hydrogel was 5 g/L,the removal rate of Cu~(2+),Cd~(2+)and Pb~(2+)were98.35%,79.22% and 77.3% respectively,and attained adsorption equilibrium in 40 min. The adsorption mechanism is chemical adsorption based by level 2 adsorption kinetics model. The banana fiber and chitosan composite hydrogel has good adsorption properties for heavy metals ions and especially for Cu~(2+).
引文
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[2]Alarcón,Lilian C,Marzocchi V A. Evaluation for Paper Ability to Pseudo Stem of Banana Tree[J]. Procedia Materials Science,2015,8:814-823.
[3]Sheng Z,Gao J,Jin Z,et al. Effect of steam explosion on degumming efficiency and physicochemical characteristics of banana fiber[J].Journal of Applied Polymer Science,2014,131(16):590-600.
[4]盛占武,郑丽丽,高锦合,等.香蕉纤维酶解脱胶工艺及脱胶纤维性能[J].农业工程学报,2014,30(10):277-284.
[5]Shang W,Sheng Z,Shen Y,et al. Study on oil absorbency of succinic anhydride modified banana cellulose in ionic liquid[J].Carbohydrate Polymers,2016,141:135-142.
[6]Sheng Z,Shen Y,Dai H,et al.Physicochemical characterization of raw and modified banana pseudostem fibers and their adsorption capacities for heavy metal Pb2+and Cd2+in water[J]. Polymer Composites,2016,38:7.
[7]常春雨.新型纤维素、甲壳素水凝胶的构建、结构和性能[D].武汉:武汉大学,2011.
[8]吴宁梅.新型水凝胶的制备及其对重金属[D].南京:南京大学,2013.
[9]苏园.秸秆基水凝胶的研制及吸附性能研究[D].济南:山东大学,2016.
[10]Mohd Cairul Iqbal Mohd Amin N A,Nadia Halib,et al. Synthesis and characterization of thermo-and p H-responsive bacterial cellulose/acrylic acid hydrogels for drug delivery[J]. Carbohydrate Polymers,2012,88(2):465-473.
[11]He M,Han B,Jiang Z,et al. Synthesis of a chitosan-based photo-sensitive hydrogel and its biocompatibility[J]. Carbohydrate Polymers,2017,166(15):228-235.
[12]胡剑灿,肖敏,李改利.纤维素/壳聚糖复合吸附剂的制备及其对重金属离子吸附的研究[J].山东化工,2016(14):150-154.
[13]Fan L,Yang H,Yang J,et al.Preparation and characterization of chitosan/gelatin/PVA hydrogel forwound dressings[J]. Carbohydrate Polymers,2016,146:427-434.
[14]Elbarbary A M,Ghobashy M M. Phosphorylation of chitosan/HEMA interpenetrating polymer network prepared byγ-radiation for metal ions removal from aqueous solutions[J]. Carbohydrate Polymers,2017,162:16-27.
[15]杨金艳.壳聚糖水凝胶的制备及其对重金属的吸附研究[D].成都:成都理工大学,2016.
[16]鲍文毅,徐晨,宋飞,等.纤维素/壳聚糖共混透明膜的制备及阻隔抗菌性能研究[J].高分子学报,2015,1(1):49-55.
[17]胡秀沂.改性菠萝皮渣金属吸附剂及水凝胶的制备与表征[D].广州:华南理工大学,2010.
[18]蔡立芳,杨光,何领好,等.壳聚糖/纤维素水凝胶对铬(VI)离子吸附性能的研究[J].塑料工业,2016(9):83-86.
[19]张碟,蔡杰,徐威,等.纤维素纳米纤维水凝胶的构筑与吸附性能研究[J].林业工程学报,2019,4(2):92-98.
[20]Zhao Y,Kang J,Tan T. Salt-,p H and temperature-responsive semi-interpenetrating polymer network hydrogel based on poly(aspartic acid)and poly(acrylic acid)[J]. Polymer,2006,47(22):7702-7710.
[21]Liu Y,Wang W,Wang A. Adsorption of lead ions from aqueous solution by using carboxymethyl cellulose-g-poly(acrylic acid)/attapulgite hydrogel composites[J]. Desalination,2010,259(1-3):258-264.
[22]程婷,张晓,陈晨.重金属Cd2+在天然矿物上的吸附性能研究[J].粉煤灰综合利用,2018,6:9-12
[23]邹凡,何春霞,张杨燕,等.五种作物秸秆生物炭对重金属Pb2+的吸附性的比较[J].材料科学与工程学报,2018,36(6):993-1009.
[24]Al-Garni S. M. Biosorption of lead by Gram-ve capsulated and non-capsulated bacteria[J]. Water Sa,2007,31(3):345-350.