(1. 南華大學 資源環(huán)境與安全工程學院，衡陽 421001；
2. 南華大學 化學化工學院，衡陽 421001；
3. 南華大學 湖南省鈾尾礦庫退役治理工程技術研究中心，衡陽 421001)
摘 要: 采用溶劑熱法以二苯基次膦酰氯作為取代基合成了一種新型功能金屬有機骨架材料MIL-125-NH-PO，并通過掃描電鏡(SEM)、傅里葉變換紅外光譜(FT-IR)、X射線衍射(XRD)、熱重分析(TGA)和X射線能譜分析(EDS)對材料進行表征，探究不同的初始條件下MIL-125-NH-PO對鈾酰離子吸附性能的影響。結果表明，在pH=5、t=300 min、T=298 K、ce=40 mg/L的條件下吸附量最高可達到415.05 mg/g，吸附過程自發(fā)放熱熵減，符合Langmuir等溫吸附模型和準二級動力學模型，吸附性能較好。且在有多種共存離子的情況下，MIL-125-NH-PO對鈾酰離子依舊有良好的選擇吸附性，表明MIL-125-NH-PO是一種潛在的鈾吸附劑。
關鍵字: MOFs；鈾酰離子；功能化；吸附
（1. School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China;
2. School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001,China;
3. Engineering Technology Research Center for Decommissioning Treatment of Uranium Tailings Pond in Hunan Province, University of South China, Hengyang 421001, China）
Abstract:A novel functional metal organic framework material MIL-125-NH-PO was synthesized by solvothermal method with diphenylphosphinyl chloride as substituent. The material was characterized by SEM, FT-IR, XRD, EDS and TGA. Investigate the impact on the adsorption capability of MIL-125-NH-PO with uranyl ions under different initial conditions. The results show that under the conditions of pH=5, t=300 min, T=298 K, ce=40 mg/L, the maximum adsorption capacity can reach 556.62 mg/g. The entropy decreases with spontaneous heating in the adsorption process, which conforms to Langmuir isothermal adsorption model and quasi second-order kinetic model, and the adsorption performance is good. Moreover, in the case of multiple coexisting ions, MIL-125-NH-PO still has good selective adsorption for uranyl ions, indicating that MIL-125-NH-PO is a potential uranium adsorbent.
Key words: MOFs; uranyl ion; functionalization; adsorbent
