Studies on Adsorption Kinetic of Cd 2+ by δ-MnO2

Peng Huo; Fan Xue; Li Xuan Wang; Yan Kun Cheng; He Xiao Yun

doi:10.4028/www.scientific.net/AMR.977.274

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 977Studies on Adsorption Kinetic of Cd 2+ by δ-MnO2

Studies on Adsorption Kinetic of Cd ²⁺ by δ-MnO₂

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 ^-1 at pH value 3.28, and it was 31.98 KJ•mol ^-1 at 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%.

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Periodical:

Advanced Materials Research (Volume 977)

Pages:

274-278

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.977.274

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Online since:

June 2014

Authors:

Peng Huo*, Fan Xue, Li Xuan Wang, Yan Kun Cheng, He Xiao Yun

Keywords:

Activated Energy, Diffusion Factor, Reaction Rate, δ-MnO₂

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