摘要
在花生壳用量为1.0 g、pH值为2.0、温度为30℃、振荡速率为140 r.min-1的条件下,研究了不同初始浓度Cr(Ⅵ)溶液中Cr(Ⅵ)的吸附率随时间的变化情况。经颗粒内扩散方程验证,可以认为吸附过程在180 min前受颗粒外扩散控制、180 min后受颗粒内扩散控制,但颗粒内扩散并不是唯一的反应速率控制步骤,反应中同时发生的其它步骤都有可能控制反应速率。
The adsorption rate of Cr（Ⅵ） with different initial concentrations was studied under the conditions as follows： the dosage of peanut shell 1.0 g,the pH value was 2.0,the temperature was 30℃,the vibration speed was 140 r·min-1.It was verified by particle′s internal diffusion equation that the adsorption process before 180 min could be considered as external diffusion control,and that after 180 min could be considered as internal diffusion control,but internal diffusion was not the unique controlling step for reaction rate,maybe there were other steps that could control the reaction rate.
出处
《化学与生物工程》
CAS
2011年第2期83-85,共3页
Chemistry & Bioengineering
关键词
花生壳
吸附Cr(Ⅵ)
扩散方程
peanut shell
adsorption of Cr（Ⅵ）
diffusion equation
