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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.
Under static conditions, the thermodynamic characteristics of adsorption of chromium (Ⅵ) by sulfonated coal in aqueous solution were studied. The effects of factors such as pH, concentration and contact time of chromium-containing wastewater on adsorption and reduction of Cr (Ⅵ) by sulfonated coal were studied. The results showed that the adsorption of chromium (Ⅵ) in dilute solution was basically consistent with the Langmuir model. Due to the micropore structure of sulfonated lignite and the adsorption center containing oxygen functional groups on the surface, the adsorption of chromium Ⅵ) is mainly adsorbed in the form of HCrO4-, resulting in the desorption of water molecules and the generation of H + ions, thus increasing the thermodynamic function ΔS0.