(1. 东华理工大学 核资源与环境国家重点实验室，南昌 330013；
2. 西安蓝晓科技新材料股份有限公司，西安 710000)
摘 要: 用二乙烯三胺对丙烯酸聚合物进行改性，再用氯甲烷甲基化制备一种新型的离子交换树脂SLX-D11，系统研究树脂对废水中U(Ⅵ)的吸附行为，重点考察了pH、U(Ⅵ)初始质量浓度、吸附时间和温度等因素对其吸附的影响。采用BET、SEM-EDS、FTIR对吸附前后的树脂进行表征，并对吸附机理进行探讨。结果表明：在室温下树脂投加量为0.02 g、pH为5.0、U(Ⅵ)质量浓度为250 mg/L的条件下反应15 h，其饱和吸附量达175.21 mg/g。该吸附过程符合准二级动力学模型和Langmuir模型，且吸附是自发吸热过程，升温有利于树脂对U(Ⅵ)的吸附。在U(Ⅵ)质量浓度为250 mg/L、流速为0.3 mL/min条件下，当流经液为215个床体积时树脂吸附达到饱和；选用0.5 mol/L NaCl和0.5 mol/L H2SO4混合溶液作解吸液进行解吸，相同流速下28个床体积的解吸液能将柱床上的U(Ⅵ)完全解吸。因此，SLX-D11离子交换树脂作为分离回收废水中U(Ⅵ)的吸附材料，具有吸附量大、富集倍数高、选择性高等特点，比较适用于环境废水中U(Ⅵ)的回收，具有一定的应用前景。
关键字: 氨基；丙烯酸树脂；U(Ⅵ)；吸附
（1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;
2. Sunresin New Materials Co., Ltd., Xi’an 710000, China）
Abstract:A new type of ion exchange resins SLX-D11 was prepared by modification of acrylic polymer with diethylenetriamine and methylation of chloromethane. The effects of pH, initial mass concentration of U(Ⅵ), adsorption time, temperature and other factors on its adsorption efficiency were investigated by static batch experiments.BET, SEM-EDS and FTIR were used to characterize the resins before and after adsorption. The results show that the saturated adsorption capacity reaches 175.21 mg/g when resins dosage is 0.02 g, pH is 5.0, mass concentration of U(Ⅵ) is 250 mg/L and adsorption time is 15 h. The adsorption behavior can be precisely described by the pseudo-second-orderkinetic model and Langmuir isothermal model. In addition, the adsorption is a spontaneous endothermic process, and temperature rise is beneficial to adsorption of U(Ⅵ) by SLX-D11resins. Under the condition that the mass concentration of U(Ⅵ) is 250 mg/L and the flow rate is 0.3 mL/min, the adsorption reaches saturation when the flow volume reaches 215 bed volumes. The mixed solution of 0.5 mol/L NaCl and 0.5 mol/L H2SO4 is selected as desorption solution. At the same flow rate, the desorption solution of 28 bed volumes can completely desorbed U(Ⅵ) on the column bed. So, as a adsorption material for separating and recovering U(Ⅵ) from the wastewater, SLX-D11 ion exchange resins has the characteristics of large adsorption capacity, high enrichment ratio and high selectivity. It is applicable to the recovery of U(Ⅵ) from environmental wastewater and has certain application prospects.
Key words: amino; acrylic resins; U(Ⅵ); adsorption
