Isothermal, kinetic, and thermodynamic studies for solid-phase extraction of uranium(VI) via hydrazine-impregnated carbonbased material as efficient adsorbent  

作　　者：A.Morsy M.H.Taha Muhammad Saeed Amir Waseem Muhammad Asad Riaz M.M.Elmaadawy 

机构地区：[1]Nuclear Materials Authority,El Maddi,P.O.Box 530,Cairo,Egypt [2]Department of Chemistry,Quaid-i-Azam University,Islamabad 45320,Pakistan

出　　处：《Nuclear Science and Techniques》2019年第11期41-51,共11页核技术（英文）

摘　　要：The current study describes the application of a new extraction method for efficient uranium adsorption via cost-effective hydrazine-impregnated activated carbon.Various experimental parameters such as time, adsorbent weight, temperature(°C), and uranium concentration were thoroughly investigated. The synthesized adsorbent was characterized via X-ray diffraction, Fourier transformation infrared spectroscopy(FT-IR), scanning electron microscopy, and thermogravimetric analysis. The results showed86% uranium extraction under optimized conditions(20% P2O5 at 25 °C, 120 min). The obtained findings fit well with thermodynamic and isothermal(Langmuir and Freundlich isotherms) models and pseudo second-order kinetics. In thermodynamic studies, the negative sign of(DG°) specified the spontaneity of process, the negative sign of(DH°) revealed endothermicity, and the positive sign of(DS°) showed high randomness after adsorption.The current study describes the application of a new extraction method for efficient uranium adsorption via cost-effective hydrazine-impregnated activated carbon.Various experimental parameters such as time, adsorbent weight, temperature（°C）, and uranium concentration were thoroughly investigated. The synthesized adsorbent was characterized via X-ray diffraction, Fourier transformation infrared spectroscopy（FT-IR）, scanning electron microscopy, and thermogravimetric analysis. The results showed86% uranium extraction under optimized conditions（20% P2O5 at 25 °C, 120 min）. The obtained findings fit well with thermodynamic and isothermal（Langmuir and Freundlich isotherms） models and pseudo second-order kinetics. In thermodynamic studies, the negative sign of（DG°） specified the spontaneity of process, the negative sign of（DH°） revealed endothermicity, and the positive sign of（DS°） showed high randomness after adsorption.

关 键 词：URANIUM Adsorption Phosphoric acid HYDRAZINE Carbon 

分 类 号：TL2[核科学技术—核燃料循环与材料]