硅胶负载交联壳聚糖树脂的制备及吸附性能

以壳聚糖、硅胶为主要原料制备了一种硅胶负载交联壳聚糖树脂,采用红外光谱(IR)、X-衍射(XRD)和扫描电镜(SEM)对其进行结构性能表征,并研究了树脂对金、银离子的吸附行为。重点考察了交联剂用量、介质pH值和初始离子浓度等因素对树脂材料吸附率的影响,试验结果表明,该树脂对金银离子的吸附率均大于90%。对于金离子的吸附而言,控制pH值在4,吸附时间90 min时吸附率最高;对于银离子的吸附而言,控制pH值在4~6,吸附时间100 min时吸附率最高。离子初始质量浓度对树脂材料的吸附率影响不大。

Synthesis and Adsorption Properties of the Crosslinked Chitosan Resins Supported by SiO2

A series of crosslinked chitosan resins supported by SiO2 were synthesized with chitosan and SiO2. The structures of the crosslinked chitosan resins were analyzed with infrared （IR） spectroscopy, X- ay diffraction （XRD） and scanning electron microscopy （SEM）. The adsorption capacities of the above resins for Au（ Ⅲ ） and Ag（ Ⅰ ） were also studied. The effects of factors such as amounts of crosslinked agents, media pH value and original ion concentration on the adsorption rate of the above resins were in- vestigated emphatically. The results indicate that the resin has good adsorption effect on Au（ Ⅲ ） and Ag （ Ⅰ ）. For Au（ Ⅲ ）, the maximum adsorption rate can be obtained when pH = 4, adsorption time is 90 min. For Ag（ Ⅰ ） , the maximum adsorption rate can be obtained when pH = 4--6, adsorption time is 100 min. The original ion concentration has less impact on adsorption rate.