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采用一次平衡法研究Cr(Ⅵ)在供试土壤中的吸附行为,应用Langmuir方程和Freundlich方程对等温吸附反应进行拟合,计算出供试土壤对Cr(Ⅵ)的最大吸附量,比较2种土壤对Cr(Ⅵ)的吸附能力;分别去除土壤有机质和游离氧化铁,对比去除前后土壤对Cr(Ⅵ)的吸附能力的变化。结果表明,潮棕壤对Cr(Ⅵ)的吸附能力高于棕壤;2种方程可以很好地拟合Cr(Ⅵ)在供试土壤中的吸附反应,Cr(Ⅵ)在棕壤和潮棕壤中的最大吸附量分别为204.08 mg/kg和232.5 mg/kg;土壤中的有机质降低棕壤对Cr(Ⅵ)的吸附能力;土壤中游离氧化铁对棕壤吸附Cr(Ⅵ)起重要作用。
The adsorption equilibrium of Cr (Ⅵ) in soils was studied by a single equilibrium method. The isothermal adsorption reaction was fitted by Langmuir equation and Freundlich equation, and the maximum adsorption capacity of Cr (Ⅵ) Soil adsorption capacity of Cr (Ⅵ) was studied. Soil organic matter and free iron oxide were removed respectively, and the adsorption capacity of soil Cr (Ⅵ) before and after removal was compared. The results showed that the adsorption capacity of Cr (Ⅵ) in tidal brown soil was higher than that of brown soil. The two equations could well fit the adsorption reaction of Cr (Ⅵ) in the soils tested. Cr (Ⅵ) The maximum adsorption capacity of brown soil was 204.08 mg / kg and 232.5 mg / kg, respectively. The organic matter in soil reduced the adsorption capacity of brown soil to Cr (Ⅵ), and the free iron oxide in soil played an important role in the adsorption of Cr (Ⅵ) on brown soil effect.