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以硝酸锰和硝酸钴为印迹分子,采用反相悬浮和溶胶凝胶法结合制备了双印迹交联壳聚糖微球(Co/MnCCTS),并与谷氨酸的氨基接枝合成钴/锰双印迹谷氨酸-壳聚糖吸附剂(Glu-Co/Mn-CCTS)。采用傅里叶变换红外光谱、扫描电镜对其结构进行了表征,并进行了低质量浓度Co2+和Mn2+的静态吸附实验。结果表明,溶液的p H、温度和初始质量浓度、吸附时间、干扰离子对Glu-Co/Mn-CCTS的吸附性能均有较大影响,Glu-Co/Mn-CCTS对Co2+、Mn2+的吸附过程符合Lagergren准二级动力学以及Freundlich和Langmuir等温吸附模型;303 K下,当p H=4~7时,对Co2+和Mn2+的去除率均在98%以上;303 K下,当p H约为5.5时,对Co2+和Mn2+的去除率在吸附4 h后均在96%以上;干扰离子存在下,吸附剂对Co2+的选择吸附性能和抗干扰能力优于Mn2+。
The double-labeled cross-linked chitosan microspheres (Co / MnCCTS) were prepared by reverse phase suspension and sol-gel method using manganese nitrate and cobalt nitrate as the imprinted molecules. The cobalt / manganese Double blot glutamate-chitosan adsorbent (Glu-Co / Mn-CCTS). The structure was characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The static adsorption experiments of low concentration of Co2 + and Mn2 + were carried out. The results showed that p H, temperature and initial mass concentration, adsorption time and interfering ions had a significant effect on the adsorption of Glu-Co / Mn-CCTS. The adsorption of Co2 + and Mn2 + by Glu- It is in accordance with Lagergren pseudo-second order kinetics and Freundlich and Langmuir isothermal adsorption model. At 303 K, the removal rates of Co2 + and Mn2 + are all over 98% when p H = 4 ~ 7; when p H is about 5.5, the removal rates of Co2 + and Mn2 + were more than 96% after adsorption for 4 h. The adsorption and anti-interference ability of Co2 + was better than that of Mn2 + in the presence of interfering ions.