磁性氧化石墨烯的制备及对刚果红吸附性研究
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摘要
首先使用2-氨基乙硫醇与丙烯酸分别对氧化石墨烯(GO)与3-氨丙基三乙氧基硅烷(APTES)包覆改性的四氧化三铁(Fe_3O_4)进行修饰,接着利用巯基-烯点击化学法制备得到磁性氧化石墨烯(MGO)复合材料。通过FT-IR,XRD,SEM,TEM,VSM等表征手段对目标产物进行表征。利用所得产物做为吸附剂去除水中刚果红(CR)染料。研究了该复合材料的吸附动力学、吸附等温线及初始pH值对吸附的影响,考察了MGO对水中CR的去除效果。结果表明:pH在4.0时复合材料的吸附效果最好,吸附时间在30 min左右时达到吸附平衡,最大吸附量为321.7 mg·g~(-1)。其吸附动力学符合二级动力学模型,吸附模型符合Langmuir模型,吸附-解吸附性能较弱。
The graphene oxide(GO) and the 3-aminopropyltriethoxysilane(APTES) coated ferroferric oxide(Fe3 O4) were modified by 2-aminoethanethiol and acrylic acid, respectively, to prepare the magnetic graphene oxide(MGO) composite material by the thiol-ene click chemistry. The as-prepared MGO was characterized by FT-IR, XRD, SEM, TEM, and VSM, and then used as adsorbent for removing anionic dye Congo red(CR) from an aqueous solution. Both the effect of MGO on the removal of CR in water and the adsorption kinetics, the adsorption isotherm, as well as the influence of initial pH on the adsorption properties of MGO were investigated. The experimental results showed that the adsorption was optimized when pH was 4.0, the maximum adsorption capacity(321.7 mg·g~(-1)) was obtained when the adsorption equilibrium reached at about 30 min, the adsorption kinetics accorded with the second-order kinetic model, the adsorption model accorded with the Langmuir model, and the adsorption-desorption performance of MGO was poor.
The graphene oxide(GO) and the 3-aminopropyltriethoxysilane(APTES) coated ferroferric oxide(Fe3 O4) were modified by 2-aminoethanethiol and acrylic acid, respectively, to prepare the magnetic graphene oxide(MGO) composite material by the thiol-ene click chemistry. The as-prepared MGO was characterized by FT-IR, XRD, SEM, TEM, and VSM, and then used as adsorbent for removing anionic dye Congo red(CR) from an aqueous solution. Both the effect of MGO on the removal of CR in water and the adsorption kinetics, the adsorption isotherm, as well as the influence of initial pH on the adsorption properties of MGO were investigated. The experimental results showed that the adsorption was optimized when pH was 4.0, the maximum adsorption capacity(321.7 mg·g~(-1)) was obtained when the adsorption equilibrium reached at about 30 min, the adsorption kinetics accorded with the second-order kinetic model, the adsorption model accorded with the Langmuir model, and the adsorption-desorption performance of MGO was poor.
引文
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[7]Kolb H C,Finn M G,Sharpless K B. Cheminform abstract:click chemistry:diverse chemical function from a few good reactions[J]. Angewandte Chemie International Edition,2010,32(35):2004–2021.
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[10]Shen J,Shi M,Ma H,et al. Synthesis of hydrophilic and organophilic chemically modified graphene oxide sheets[J].Journal of Colloid&Interface Science,2010,352(2):366–370.
[11]张秀蓉,龚继来,曾光明,等.磁性氧化石墨烯制备及去除水中刚果红的研究[J].中国环境科学,2013,33(8):1379–1385.
[12]王雪.磁性石墨烯复合材料的制备及在持久性污染物处理中的应用[D].武汉:湖北大学,2013.
[13]Yao Y,Miao S,Liu S,et al. Synthesis,characterization,and adsorption properties of magnetic Fe_3O_4@graphene nanocomposite[J].Chemical Engineering Journal,2012,184:326–332.