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利用黄原胶-丙烯酰胺接枝共聚物(XG-g-AM)吸附溶液中的Cu(Ⅱ),通过静态吸附实验研究了吸附过程中的热力学和动力学性质,使用红外光谱仪和X射线衍射仪对XG-g-AM吸附Cu(Ⅱ)前后的分子结构进行了表征。研究结果表明:在298~318K温度范围内,吸附行为可同时用Freundlich等温式和Langmuir等温式进行描述,吸附为自发的、吸热的熵增加过程,温度升高有利于吸附。吸附过程符合伪二级动力学模型。XG-g-AM通过物理和配位吸附方式吸附Cu(Ⅱ),吸附Cu(Ⅱ)后,XG-g-AM的结晶结构被破坏,结晶度下降。Cu(Ⅱ)以非结晶态形式在XG-g-AM上聚集存在。
The adsorption kinetics of Cu (Ⅱ) in xanthan gum-acrylamide graft copolymer (XG-g-AM) was investigated by means of static adsorption experiments. The thermodynamic and kinetic properties of the adsorption process were investigated by using infrared spectroscopy and X-ray diffraction The molecular structure of Cu (Ⅱ) adsorbed by XG-g-AM was characterized. The results show that the adsorption behavior can be described by both Freundlich isotherm and Langmuir isotherm at 298 ~ 318K. The adsorption is spontaneous and the endothermic entropy increases. The increase of temperature is favorable for the adsorption. Adsorption process conforms to the pseudo-second-order kinetic model. XG-g-AM adsorbed Cu (Ⅱ) through physical and coordinate adsorption, and the crystal structure of XG-g-AM was destroyed after Cu (Ⅱ) was adsorbed. Cu (Ⅱ) exists in amorphous form on XG-g-AM.