吸附
离子强度
化学
壳聚糖
零电荷点
吸附
弗伦德利希方程
水溶液
傅里叶变换红外光谱
X射线光电子能谱
表面电荷
离子键合
核化学
无机化学
化学工程
有机化学
物理化学
离子
工程类
作者
Shuguang Wang,Xiaohua Sun,Xianwei Liu,Wen-Xin Gong,Baoyu Gao,Nan Bao
标识
DOI:10.1016/j.cej.2007.11.025
摘要
Chitosan hydrogel beads were studied for the adsorption of fulvic acid (FA) from aqueous solutions to examine the adsorption behaviors and mechanisms. Kinetic and isotherm studies were carried out by considering the effects of various parameters, such as initial concentration (5–50 mg/L), temperature (15, 30, 45 °C), pH (4–12) and ionic strength (0–0.5 M NaCl). The results indicate that the adsorption of FA is strongly dependent on pH and ionic strength under our experimental conditions. The adsorption kinetics and isotherms showed that the sorption processes were fitted better by intra-particle model and the Freundlich equation, respectively. Point of zero charge (pHPZC) study indicated that the surface of chitosan hydrogel beads was positively charged at pH <9.9 and negatively charged at pH >9.9. Fourier transform infrared spectroscopy suggested that FA adsorption was mainly through interactions with the N atoms in chitosan hydrogel beads and further X-ray photoelectron spectroscopy (XPS) revealed the formation of organic complex between the protonated amino groups and FA after adsorption.
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