Abstract

Chitosan-graft-polyacrylic acid/graphite oxide (CTS-g-PAA/GO) superabsorbent composite was prepared by solution intercalation graft copolymerization of chitosan (CTS), acrylic acid and graphite oxide (GO). The composite was characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy, transmission electron microscope, thermogravimetric analysis and differential scanning calorimetry. Adsorption properties of cationic dyes such as rhodamine 6G (R6G) and methyl violet (MV) onto the composite were studied in detail. It was found that small amount of GO (0.02 g) can improve the adsorption capacities of dyes significantly. The interactions between GO and dye molecules are discussed. For R6G,there are both hydrogen bonds and the electrostatic interactions between CTS-g-PAA/GO composite and dye molecules, while for MV, there are only electrostatic interactions. The adsorption isotherms and kinetics were also studied. It was shown that adsorption of R6G was in accordance with the Langmuir isotherm equation, while that of MV met both the Langmuir and Freundlich equations. The adsorption kinetic of R6G and MV both were in accordance with the pseudo-second-order kinetic model.

中文翻译：

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壳聚糖接枝聚丙烯酸/氧化石墨复合材料的制备及其对阳离子染料的吸附性能研究

摘要

壳聚糖接枝聚丙烯酸/氧化石墨（CTS- g通过壳聚糖（CTS），丙烯酸和氧化石墨（GO）的溶液插层接枝共聚反应制备-PAA / GO）超吸收性复合材料。通过傅立叶变换红外光谱，粉末X射线衍射，扫描电子显微镜，透射电子显微镜，热重分析和差示扫描量热法对复合材料进行表征。详细研究了若丹明6G（R6G）和甲基紫（MV）等阳离子染料在复合材料上的吸附性能。发现少量的GO（0.02 g）可以显着提高染料的吸附能力。讨论了GO和染料分子之间的相互作用。对于R6G，CTS- g之间既存在氢键又存在静电相互作用-PAA / GO复合和染料分子，而对于MV，只有静电相互作用。还研究了吸附等温线和动力学。结果表明，R6G的吸附符合Langmuir等温方程，而MV的吸附符合Langmuir和Freundlich方程。R6G和MV的吸附动力学均符合拟二级动力学模型。