摘要
为了解Cr(Ⅵ)在土壤中的迁移转化规律,探明Cr(Ⅵ)在土壤中的吸附行为,采用室内振荡平衡法,以褐土、潮土以及黄绵土为研究对象,研究振荡时间、温度对土壤吸附Cr(Ⅵ)的影响。结果表明:(1)不同类型、不同层次土壤对Cr(Ⅵ)的吸附平衡时间和吸附量不同。3种供试土壤的振荡平衡时间顺序依次为黄绵土>潮土>褐土;在吸附平衡24 h时,3种供试土壤的吸附量顺序依次为潮土>褐土>黄绵土;(2)随着温度的升高,吸附量逐渐下降,不同类型的土壤下降速度不一样。3种供试土壤对Cr(VI)的吸附量下降速度的顺序为潮土>黄绵土>褐土;(3)3种供试土壤吸附Cr(Ⅵ)的等温线均符合Freundlich方程和Langmuir方程,但Freundlich方程的拟合效果更好;(4)3种供试土壤的吸附都是非自发的(ΔG>0),且放热(ΔH<0)的化学吸附过程。
To understand the regulation of migration and conversion of Cr(Ⅵ) in soil, and investigate the adsorption of Cr(Ⅵ) in soil, the oscillation balance method was used to study the effect of oscillation time and temperature on Cr(Ⅵ) adsorption of cinnamon soil, fluvo-aquic soil and loess soil. The results showed that(1) the adsorption equilibrium time and adsorption capacity of Cr(Ⅵ) in different soil types and depths were different, the order of oscillation equilibrium time of the tested soil was loess soil > fluvo-aquic soil >cinnamon soil; for 24 h adsorption equilibrium, the adsorption of the tested soil was fluvo-aquic soil >cinnamon soil > loess soil;(2) as temperature increased, the amount of adsorption gradually decreased, and the rate of decline was different; the decreasing order of the adsorption rate of Cr(Ⅵ) was fluvo-aquic soil > loess soil > cinnamon soil;(3) the isotherms of Cr(Ⅵ) adsorbed by the three soil types were consistent with the Freundlich equation and the Langmuir equation, and the Freundlih equation was better;(4) the adsorption of the tested soil was non-spontaneous(ΔG>0) and exothermic(ΔH<0) chemisorption process.
引文
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