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以钠基膨润土为原料、壳聚糖为插层材料,制备了壳聚糖插层膨润土(CS-Bent),用于去除废水中的U(VI)。考察了p H、吸附剂投加量、U(VI)初始含量和吸附时间对CS-Bent吸附U(VI)的影响。结果表明,当温度为25℃,p H为6,CS-Bent投加量为1.6 g/L时,吸附平衡时间为60 min,对U(VI)的最大吸附量可达59.52 mg/g。Langmuir等温吸附模型和准2级动力学模型均可较好地拟合其吸附过程。X-射线衍射分析表明壳聚糖已经成功插入膨润土层间,傅里叶变换红外光谱、扫描电镜分析表明CS-Bent成功吸附U(VI)。以0.1 mol/L的HCl溶液作为解吸液,经过5次解吸后去除率仍有90%以上,表明CS-Bent可再生,具有较好的重复利用性。
Using sodium bentonite as raw material and chitosan as intercalation material, chitosan intercalated bentonite (CS-Bent) was prepared to remove U (VI) in wastewater. The effects of p H, sorbent dosage, initial U (VI) content and sorption time on the adsorption of CS-Bent on U (VI) were investigated. The results showed that when the temperature was 25 ℃, p H was 6 and CS-Bent dosage was 1.6 g / L, the adsorption equilibrium time was 60 min and the maximum adsorption capacity of U (VI) was 59.52 mg / g. Langmuir isothermal adsorption model and quasi-second-order kinetic model can fit the adsorption process well. X-ray diffraction analysis showed that chitosan has been successfully inserted into the bentonite layer. Fourier transform infrared spectroscopy and scanning electron microscopy analysis showed that CS-Bent successfully adsorbed U (VI). With 0.1 mol / L HCl solution as desorption solution, the removal rate after over 5 times desorption still exceeded 90%, indicating that CS-Bent can be regenerated and has good reusability.