磺化煤吸附铬(Ⅵ)的热力学研究  

Adsorption of Chromium (Ⅵ) from Industrial Wastewater with Solphonated Lignite

作　　者：马淞江[1] 李方文[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《湖南科技大学学报（自然科学版）》2007年第3期121-124,共4页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：湖南省自然科学基金资助项目(06JJ4005)

摘　　要：在静态条件下,研究了水溶液中磺化煤吸附铬(Ⅵ)的热力学特性,研究了含铬废水的pH、浓度和接触时间等因素对磺化煤吸附、还原Cr(Ⅵ)的影响,测定了不同温度下的吸附等温线.结果表明:在稀溶液中吸附铬(Ⅵ)基本符合Langmuir模型;由于磺化褐煤的微孔结构和表面存在含氧官能团的吸附中心,磺化煤吸附铬(Ⅵ)主要以HCrO4-形式被吸附,导致了水分子的脱附及H+离子的产生,从而使热力学函数ΔS0增加.The thermodynamics characteristics of Cr （ Ⅵ ） adsorption from aqueous solution with solphonated lignite under static conditions was studied, the effects of pH and concentration and contact time were also reported, the adsorption isotherm line at different temperature was determined. The results show that the Cr （Ⅵ） adsorption in dilute solution can coincide with the Langmuir model; Cr （ Ⅵ ） ion is adsorbed by solphonated lignite in the form of HCrO4^- ion,owing to porous structure of solphonated lignite and the adsorption activation center of oxygen-containing function group existed in solphonated lignite surface, the desorbing of water molecules and H^＋ ion formation make the thermodynamics function ΔS^0 increasing. The feasibility of solphonated lignite adsorbing Cr（ Ⅵ ） for reuse was also discussed in the present study. 4figs., 3tabs., 11 refs.

关 键 词：磺化煤 铬(Ⅵ) 吸附热力学 机理 

分 类 号：TQ013.1[化学工程]