1. Studies on Adsorption Kinetic of Cd 2+ by δ-MnO2
- Author
-
Fan Xue, Li Xuan Wang, Yan Kun Cheng, Peng Huo, and He Xiao Yun
- Subjects
Reaction rate ,Adsorption ,Adsorption kinetics ,Chemistry ,Desorption ,Inorganic chemistry ,Diffusion factor ,General Engineering - Abstract
The adsorption capability of Cd2+with δ-MnO2was studied in water. The results indicated: the adsorption strongly relied on pH values. At 303K, the pH values were above 6.05, adsorption percentages of Cd2+were nearly 100%. When pH values were below 2.3, adsorption rates of Cd2+was below 20%. The adsorption processes was completely controlled by reaction rate and diffusion factor. The reaction rate of adsorption increased with pH values and temperatures. The adsorption activated energy of Cd2+was 54.66 KJ•mol-1at pH value 3.28, and it was 31.98 KJ•mol-1at pH value 6.05. δ-MnO2may be effectively desorpted after adsorption Cd2+at the pH values below 2.05. The desorption rates were about 75%.
- Published
- 2014