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Citation: LIU Zhi-Rong, WEI Peng, ZHOU Li-Min, ZENG Kai. Adsorption Kinetics of Nickel in Peat-aqueous Systems[J]. Chinese Journal of Applied Chemistry, ;2007, 24(4): 420-424. shu

Adsorption Kinetics of Nickel in Peat-aqueous Systems

1.
Department of Applied Chemistry, East China Institute of Technology, Fuzhou 344000

Corresponding author: LIU Zhi-Rong,
Received Date: 19 May 2006
Available Online: 20 December 2006
Fund Project: 国家留学基金管理委员会资助项目(22307S05) (22307S05)东华理工学院博士基金资助项目(DHB0504) (DHB0504)东华理工学院核资源与环境工程技术中心开放测试基金资助项目(051104) (051104)

We show that peat can enrich nickel under static conditions by means of Liquid Scintillation Coun-ting.It was found that the adsorption of ⁶³Ni on peat reached 69% in 5 min,and equilibrium.It was deduced from ionisation equilibrium of peat,ion exchange equilibrium between hydrogen ion and nickel ion,and mass balance among peat-water system that the adsorption amount of ⁶³Ni depended on concentration of hydrogen ion and nickel ion in equilibrium state.The pH value showed great influence on the adsorption of nickel onto peat.Along with the increase of aqueous pH value,the transfer rate constant from water compartment to peat compartment increases gradually while the transfer rate constant from peat compartment to water compartment decreases progressively.The ratio between two of rate constants increases with pH.At pH=4.624 6,the two reversible transfer rate constants both equal 2.51.The ability of peat to bind Ni increases with the increase in pH.The adsorption kinetics of nickel on peat can be described by a closed two-compartment model.Theoretical data were in good agreement with experimental data after fitting.
- nickel-63,
- peat,
- adsorption,
- isotopic tracer technique,
- closed two-compartment model
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