(1. 東華理工大學(xué) 核資源與環(huán)境國家重點(diǎn)實(shí)驗(yàn)室，南昌 330013；
2. 西安藍(lán)曉科技新材料股份有限公司，西安 710000)
摘 要: 用二乙烯三胺對丙烯酸聚合物進(jìn)行改性，再用氯甲烷甲基化制備一種新型的離子交換樹脂SLX-D11，系統(tǒng)研究樹脂對廢水中U(Ⅵ)的吸附行為，重點(diǎn)考察了pH、U(Ⅵ)初始質(zhì)量濃度、吸附時間和溫度等因素對其吸附的影響。采用BET、SEM-EDS、FTIR對吸附前后的樹脂進(jìn)行表征，并對吸附機(jī)理進(jìn)行探討。結(jié)果表明：在室溫下樹脂投加量為0.02 g、pH為5.0、U(Ⅵ)質(zhì)量濃度為250 mg/L的條件下反應(yīng)15 h，其飽和吸附量達(dá)175.21 mg/g。該吸附過程符合準(zhǔn)二級動力學(xué)模型和Langmuir模型，且吸附是自發(fā)吸熱過程，升溫有利于樹脂對U(Ⅵ)的吸附。在U(Ⅵ)質(zhì)量濃度為250 mg/L、流速為0.3 mL/min條件下，當(dāng)流經(jīng)液為215個床體積時樹脂吸附達(dá)到飽和；選用0.5 mol/L NaCl和0.5 mol/L H2SO4混合溶液作解吸液進(jìn)行解吸，相同流速下28個床體積的解吸液能將柱床上的U(Ⅵ)完全解吸。因此，SLX-D11離子交換樹脂作為分離回收廢水中U(Ⅵ)的吸附材料，具有吸附量大、富集倍數(shù)高、選擇性高等特點(diǎn)，比較適用于環(huán)境廢水中U(Ⅵ)的回收，具有一定的應(yīng)用前景。
關(guān)鍵字: 氨基；丙烯酸樹脂；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
