由茶梗改性制备磁性纤维素材料及其对废水中Cu(Ⅱ)的吸附性能
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摘要
以茶梗为原料制备纤维素微粒,通过交联、接枝共聚等手段进行改性,包埋磁性Fe_3O_4纳米粒子,成功制得一种磁性纤维素微粒(tea-magnetic cellulose microspheres,简称T-MCMs)。利用红外光谱(IR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)及X-射线衍射(XRD)等手段对其进行结构表征,通过振动样品磁强计分析复合材料的磁性强度。同时以含Cu(Ⅱ)溶液为模拟废水,考察Cu(Ⅱ)初始浓度、吸附时间、溶液初始p H值及常见共存离子等因素对吸附性能的影响,并分别用三种动力学模型对数据进行拟合。结果表明,室温下溶液初始p H为5.0、Cu(Ⅱ)起始浓度为80 mg/L、震荡接触4 h时已完成饱和吸附的90%以上,常见离子不会对吸附效果产生影响,吸附完成后可以通过外磁场简单分离。动力学分析结果显示准二级动力学模型更符合该吸附行为。
Magnetic cellulose microspheres, containing Fe_3O_4 nanoparticles were prepared with tea(T-MCMs), which was modified by cross-linking and graft copolymerization. The resulting composite was characterized by IR(infrared spectroscopy), SEM(scanning electron microscopy), XRD(X-ray powder diffraction) and VSM(vibrating sample magnetometer). The adsorption performance of Cu(Ⅱ) on T-MCMs was further studied. The initial Cu(Ⅱ) concentration, different p H and contact time was investigated. In addition, the kinetic data were examined in terms of the pseudo-first-order and pseudo-second-order kinetic models and intra-particle diffusion model. The results showed that over 90% of saturated adsorption capacity was achieved at p H5, with an initial Cu(Ⅱ) concentration of 80 mg/L and a 4 h contact time. And the common coexisting ions had no negative effect on the Cu(Ⅱ) adsorption. The adsorbent could be separated using a single magnet after adsorption. Finally, the adsorption data fit best with the pseudo-second-order kinetic model.
Magnetic cellulose microspheres, containing Fe_3O_4 nanoparticles were prepared with tea(T-MCMs), which was modified by cross-linking and graft copolymerization. The resulting composite was characterized by IR(infrared spectroscopy), SEM(scanning electron microscopy), XRD(X-ray powder diffraction) and VSM(vibrating sample magnetometer). The adsorption performance of Cu(Ⅱ) on T-MCMs was further studied. The initial Cu(Ⅱ) concentration, different p H and contact time was investigated. In addition, the kinetic data were examined in terms of the pseudo-first-order and pseudo-second-order kinetic models and intra-particle diffusion model. The results showed that over 90% of saturated adsorption capacity was achieved at p H5, with an initial Cu(Ⅱ) concentration of 80 mg/L and a 4 h contact time. And the common coexisting ions had no negative effect on the Cu(Ⅱ) adsorption. The adsorbent could be separated using a single magnet after adsorption. Finally, the adsorption data fit best with the pseudo-second-order kinetic model.
引文
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[3]Gong J M,Liu T,Wang X Q,et al.Efficient removal of heavy metal ions from aqueous systems with the assembly of anisotropic layered double hydroxide nanocrystals carbon nanosphere[J].Evironmental Science&Technology,2011,45(14):6181-6187.
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[5]胡晖,高红,贾绍义.高梯度磁过滤技术及展望[J].过滤与分离,2000,10(2):26-28.
[6]Krishnani K K,Zhang Yu,Xiong L,et al.Bactericidal and ammonia removal activity of silver ion-exchanged zeolite[J].Bioresource Technology,2012,117:86-91.
[7]Shuai Peng,Hecheng Meng,Yong Ouyang,et al.Nanoporous magnetic cellulose-chitosan composite microspheres:Preparation,characterization,and application for Cu(Ⅱ)adsorption[J].Industrial&Engineering Chemistry Research,2014,53(6):2106-2113.
[8]Weber V,Linsberger L,Ettenauer M,et al.Development of specific adsorbents for human tumor necrosis factor-a:Influence of antibody immobilization on performance and biocompatibility[J].Biomacromolecules,2005,6(4):1864-1870.
[9]Boudrahem F,Aissani-Benissad F,Soualah A.Sorption of lead(Ⅱ)from aqueous solution by using leaves of date trees as an adsorbent[J].Journal of Chemical Engineering Data,2011,56(5):1804-1812.
[10]Altun T,Pehlivan E.Removal of Cr(Ⅵ)from aqueous solutions by modified walnut shells[J].Food Chemistry,2012,132(2):693-700.
[11]Jeon C.Removal of copper ion using rice hulls[J].Journal of Industrial and Engineering Chemistry,2011,17(3):517-520.
[12]Sciban M,Klasnja M,Skrbic B.Adsorption of copper ions from water by modified agricultural by-products[J].Desalination,2008,229(3):170-180.
[13]Yu H,Fu G,He B.Preparation and adsorption properties of PAA-grafted cellulose adsorbent for low-density lipoprotein from human plasma[J].Cellulose,2007,14(2):99-107.
[14]Littunen K,Hippi U,Johansson L-S,et al.Free radical graft copolymerization of nanofibrillated cellulose with acrylic monomers[J].Carbohydrate Polymers,2011,84(3):1039-1047.
[15]余宗宝,吴雪莲,任丽宏.油酸包覆Fe3O4纳米粒子的红外光谱研究[J].兵器材料科学与工程,2008,5(31):69-71.
[16]Crini G,Badot P M.Application of chitosan,a natural aminopolysaccharide,for dye removal from aqueous solutions by adsorption processes using batch studies:A review of recent literature[J].Progress in Polymer Science,2008,33(4):399-447.