CAJ | 학술논문

以微波辅助 KMnO4改性玉米芯为吸附剂来吸附溶液中的 U(Ⅵ),探讨改性玉米芯吸附溶液中 U(Ⅵ)的热力学特征.结果表明:随着温度的升高,改性玉米芯对 U(Ⅵ)的吸附量增大.Langmuir 模型能更好地反映吸附过程特征,说明吸附主要发生在改性玉米芯表面的活性区域,属于单分子层吸附.吸附热力学参数ΔG、ΔH 和ΔS的计算结果表明,所有温度下ΔG 在 U(Ⅵ)初始浓度≤80 mg/L 时均为负值,且温度越高ΔG 值越负,表明改性玉米芯对 U(Ⅵ)的吸附过程是一个自发的过程,且温度越高,自发程度越大.焓变ΔH 和熵变ΔS 都为正值,说明吸附过程吸热,温度越高,越有利于吸附的进行.
이미파보조 KMnO4개성옥미심위흡부제래흡부용액중적 U(Ⅵ),탐토개성옥미심흡부용액중 U(Ⅵ)적열역학특정.결과표명:수착온도적승고,개성옥미심대 U(Ⅵ)적흡부량증대.Langmuir 모형능경호지반영흡부과정특정,설명흡부주요발생재개성옥미심표면적활성구역,속우단분자층흡부.흡부열역학삼수ΔG、ΔH 화ΔS적계산결과표명,소유온도하ΔG 재 U(Ⅵ)초시농도≤80 mg/L 시균위부치,차온도월고ΔG 치월부,표명개성옥미심대 U(Ⅵ)적흡부과정시일개자발적과정,차온도월고,자발정도월대.함변ΔH 화적변ΔS 도위정치,설명흡부과정흡열,온도월고,월유리우흡부적진행.
@@@@The corncob modified by KMnO4 in microwave was used for the adsorption of U(Ⅵ) ions from aqueous solution, and the thermodynamic characteristics on the adsorption were discussed. The results show that the adsorption capacity of the modified corncob increases with increasing temperature. Langmuir and Freundlich isotherms were used to fit the adsorption equilibrium data, and it is found that the adsorption process follows preferably the Langmuir isotherm adsorption model, which indicates that the adsorption mainly occurs in active region on the surface of modified corncob and belongs to the monolayer adsorption. The thermodynamic parameters, such as Gibbs free energy ΔG, enthalpy ΔH and entropy ΔS changes for the adsorption of U(Ⅵ) were calculated and discussed. When the concentration of U(Ⅵ) is below 80 mg/L, the Gibbs free energies of adsorption at all temperatures are negative and decrease with increasing temperature, which indicates that the adsorption process is spontaneous and the higher the temperature is, the greater the degree of spontaneous is. The entropy change ΔS and enthalpy change ΔH are positive, so the adsorption process is a heat absorption, the higher the temperature is, the more beneficial to adsorption is.