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 

作者机构：Nuclear Materials AuthorityEl MaddiP.O.Box 530CairoEgypt Department of ChemistryQuaid-i-Azam UniversityIslamabad 45320Pakistan 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2019年第30卷第11期

页      面：41-51页

核心收录：

学科分类：08[工学] 082702[工学-核燃料循环与材料] 0805[工学-材料科学与工程（可授工学、理学学位）] 0827[工学-核科学与技术] 

主　　题：Uranium Adsorption Phosphoric acid Hydrazine Carbon 

摘      要：The current study describes the application of a new extraction method for efficient uranium adsorption via cost-effective hydrazine-impregnated activated *** 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.