(1. 南華大學(xué) 化學(xué)化工學(xué)院，衡陽 421001；
2. 南華大學(xué) 湖南省鈾尾礦庫退役治理工程技術(shù)研究中心，衡陽 421001；
3. 南華大學(xué) 蛋白質(zhì)結(jié)構(gòu)與功能重點實驗室，衡陽 421001；
4. 南華大學(xué) 鈾礦冶生物技術(shù)國防重點學(xué)科實驗室，衡陽 421001)
摘 要: 以1,3-二溴丙烷對對叔丁基杯[4]芳烴的下沿進行修飾，再利用 Na2S·9H2O 合成制備一種新型的吸附材料杯[4]芳烴對稱硫醚衍生物，并研究其吸附鈾的主要影響因素，即U(Ⅵ)溶液pH值、吸附劑投入量、鈾初始濃度及反應(yīng)時間，分析其吸附過程的反應(yīng)動力學(xué)和等溫吸附規(guī)律。結(jié)果表明：當溫度為25 ℃時，杯[4]芳烴對稱硫醚衍生物吸附鈾的最佳條件是pH值為4.0，鈾初始濃度為20 mg/ L，杯[4]芳烴對稱硫醚衍生物加入量為20 mg以及吸附平衡時間為6 h。杯[4]芳烴對稱硫醚衍生物對鈾的吸附動力學(xué)符合準二級動力學(xué)模型，吸附過程為化學(xué)吸附，相關(guān)系數(shù)為0.9998；Langmuir、D-R和 Freundlich 等溫線均可較好地擬合吸附過程，說明該吸附體系是一個單層覆蓋與多層吸附相結(jié)合的模式。紅外譜圖表明，杯[4]芳烴對稱硫醚衍生物吸附一定質(zhì)量的鈾后，在817.82 cm-1和810.10 cm-1處出現(xiàn)了鈾酰離子的伸縮振動峰，且未發(fā)生主要的結(jié)構(gòu)形態(tài)變化。
關(guān)鍵字: 對叔丁基杯[4]芳烴；功能化修飾；吸附行為；鈾
（1. School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China;
2. Laboratory of Protein Structure and Function, University of South China, Hengyang 421001, China;
3. Hunan Province Engineering Technology Research Center of Uranium Tailings Treatment, University of South China, Hengyang 421001, China;
4. Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China）
Abstract:By modifying the lower edge of tert butyl calix [4] arene with 1,3-dibromopropane, and then utilizing Na2S·9H2O to prepare a new type of absorption material, that is calix [4] arene symmetric sulfide derivatives. The main influence factors of the uranium adsorption, such as pH value of U(Ⅵ) solution, input of adsorbent, initial concentration of uranium and reaction time, were explored, finally the reaction kinetics and adsorption isothermal law of adsorption process were analyzed. The results show that, the best condition of uranium adsorption are as follows: pH value of 4.0, initial concentration of uranium of 20 mg/L, addition adsorbent of 20 mg, adsorption equilibration time of 6 h at 25 ℃. The adsorption kinetics of calix [4] arene symmetric sulfide derivatives to uranium is accorded with pseudo-second order model. The adsorption process which is better fitted by Langmuir, D-R and Freundlich sorption isotherm is chemisorption and its correlation is 0.9998. The adsorption system is a single layer covering combined with multilayer adsorption model. And the infrared spectrum shows that, after adsorbing, a certain quality of uranium by calix [4] arene symmetric sulfide derivatives. In 817.82 cm-1 and 810.10 cm-1, the stretching vibrations of uranyl ion peak appears and the main structure morphology does not change.
Key words: tert butyl calix [4] arene; functional modifying; adsorption behavior; uranium
