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利用反相乳液分散-化学交联法制备磁性壳聚糖微球(TMCS),并经硫脲改性,用于吸附水溶液中Au3+和Ag+。用光学显微图、红外图谱(FTIR)、X射线衍射(XRD)等对吸附剂进行了表征。考察了TMCS对Au3+和Ag+的吸附特性。结果表明,等温吸附线可用Langmuir模型拟合,饱和吸附容量分别为:Au3+3.53mmol/g;Ag+1.98mmol/g。二者的吸附容量均随pH升高而增加。吸附动力学可用拟二级模型拟合。双组分吸附实验表明,TMCS对Au3+和Ag+有良好的吸附选择性。
Magnetic chitosan microspheres (TMCS) were prepared by reversed-phase emulsion dispersion-chemical cross-linking method and modified with thiourea to adsorb Au3 + and Ag + in aqueous solution. The adsorbents were characterized by means of optical micrographs, infrared spectra (FTIR) and X-ray diffraction (XRD). The adsorption characteristics of TMCS to Au3 + and Ag + were investigated. The results showed that the adsorption isotherms were fitted by Langmuir model. The adsorption capacities were Au3 + 3.53 mmol / g and Ag + 1.98 mmol / g, respectively. Both adsorption capacity increased with increasing pH. Adsorption kinetics can be used to pseudo-second-level model fitting. Two-component adsorption experiments showed that TMCS had good adsorption selectivity to Au3 + and Ag +.