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以氯化钙为交联剂,采用包埋法制备了一种果胶磁性微球吸附剂,通过红外光谱、扫描电镜、XRD、磁性分析和TGA对样品进行了表征,并考察了吸附时间、Mn2+(Cr6+)的浓度、吸附剂用量和吸附溶液的pH对果胶磁性微球吸附性能的影响。分析了果胶磁性微球分别吸附Mn(Ⅱ)和Cr(Ⅵ)的吸附动力学、吸附等温线。结果表明:果胶磁性微球对Mn(Ⅱ)和Cr(Ⅵ)的吸附达平衡分别需要4h和1.5h,饱合吸附量分别为54.35mg/g和9.62mg/g,吸附等温线较好地满足Freundlich模型和Langmuir模型,最大吸附量分别为102.04mg/g和25.45mg/g。吸附动力学符合准二级动力学模型,主要由化学吸附控制其吸附速率。
A calcium pectinate magnetic microsphere adsorbent was prepared by embedding calcium chloride as crosslinking agent. The samples were characterized by IR, SEM, XRD, TGA and TGA. The adsorption time, Mn2 + (Cr6 +) concentration, the amount of adsorbent and the pH of the adsorption solution on the adsorption properties of pectin magnetic microspheres. The adsorption kinetics and adsorption isotherms of Mn (Ⅱ) and Cr (Ⅵ) adsorbed on pectin magnetic microspheres were analyzed respectively. The results showed that the adsorption of Mn (Ⅱ) and Cr (Ⅵ) by pectin magnetic microspheres equilibrated 4h and 1.5h, respectively, and the saturated adsorption capacities were 54.35mg / g and 9.62mg / g, respectively. The adsorption isotherms were better The Freundlich model and the Langmuir model were satisfied. The maximum adsorption capacities were 102.04 mg / g and 25.45 mg / g, respectively. Adsorption kinetics fit quasi-second-order kinetic model, mainly controlled by chemisorption of its adsorption rate.