赤铁矿对Cr(Ⅲ)的吸附动力学研究
Research of Adsorption Dynamics of Cr(Ⅲ) Ion on Hematite Surface
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摘要: 采用吸附动力学方法,探讨了赤铁矿(a-Fe_2O_3)对重金属Cr(Ⅲ)的吸附动力学特征.研究结果表明,赤铁矿对Cr(Ⅲ)的吸附动力学特征可以采用松弛动力学方程很好地加以描述,吸附反应表现为初始快反应和随后的慢反应两个阶段,控速步骤是Cr(Ⅲ)在赤铁矿表面水膜和毛细孔的扩散作用.
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关键词:
- 赤铁矿,Cr(Ⅲ),吸附动力学
Abstract: Characteristics of the adsorption dynamics of Cr(Ⅲ) ion on hematite (a-Fe_2O_3) surface were stud-ied by the adsorption dynamics method.The results showed that the adsorption dynamics of Cr(Ⅲ) adsorp-tion on the hematite surface could well be described by a relaxation dynamic equation.The adsorption reac-tion could be divided into two processes, a fast reaction stage and a slow reaction stage, and the process of Cr(Ⅲ) diffusion on hematite surface water velum and capillary was shown to be the control step. -
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