论文部分内容阅读
利用反相乳液法制备了壳聚糖微球,并经硫脲改性得到硫脲改性壳聚糖微球(TCS),将其用于吸附Pt4+和Pd2+,考察了TCS对Pt4+和Pd2+的吸附特性;利用扫描电子显微镜、傅里叶变换红外光谱和N2吸附-脱附等方法对TCS进行了表征。表征结果显示,TCS的粒径为10～30μm、比表面积为95.6m2/g、平均孔径为12.6nm、孔体积为0.298cm3/g。实验结果表明,在pH=2时,TCS对Pt4+和Pd2+的吸附性能最佳;吸附动力学可用拟二级模型拟合,表明TCS对Pt4+和Pd2+的吸附以化学吸附反应为主;吸附等温线可用Langmuir模型拟合,Pt4+和Pd2+的饱和吸附容量分别为129.87,112.36mg/g。双组分吸附实验结果表明,TCS对Pt4+和Pd2+有良好的吸附选择性,可实现Pt4+(或Pd2+)与Cu2+,Pb2+,Cd2+,Zn2+,Ca2+的选择性分离。
Chitosan microspheres were prepared by inverse emulsion method and thiourea modified chitosan microspheres (TCS) were obtained by thiourea modification, which were used to adsorb Pt4 + and Pd2 +. The effects of TCS on Pt4 + and Pd2 + The adsorption properties were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and N2 adsorption-desorption. Characterization results show that the particle size of TCS is 10 ~ 30μm, the specific surface area is 95.6m2 / g, the average pore diameter is 12.6nm and the pore volume is 0.298cm3 / g. The experimental results show that TCS has the best adsorption performance for Pt4 + and Pd2 + at pH = 2. The adsorption kinetics can be fitted by quasi-second-order model, indicating that TCS adsorbs Pt4 + and Pd2 + mainly by chemisorption reaction. The adsorption isotherms Available Langmuir model fitting, Pt4 + and Pd2 + saturated adsorption capacity was 129.87,112.36mg / g. The results of two-component adsorption experiments show that TCS has good adsorption selectivity to Pt4 + and Pd2 +, and can selectively separate Pt4 + (or Pd2 +) from Cu2 +, Pb2 +, Cd2 +, Zn2 + and Ca2 +.