Adsorption properties of Cu2+, Cd2+ and Ni2+ by modified magnetic chitosan microspheres

作者：Zhou Li Min^*; Wang Yi Ping; Huang Qun Wu; Liu Zhi Rong

来源：Acta Physico - Chimica Sinica, 2007, 23(12): 1979-1984.

• chitosan
• ethylenediamine
• metal ions
• adsorption
• kinetic

Fe3O4/chitosan magnetic microspheres of 50 to 80 mu m were prepared using the inverse phase emulsion dispersion and chemical crosslinking technology, and then modified with ethylenediamine for use in the adsorption of heavy metal ions. The adsorption properties of the modified Fe3O4/chitosan toward Cu2+, Cd2+ and Ni2+ were investigated. It was found that the adsorption capacities of Cu2+ and Ni2+ increased with pH, and a maximum adsorption for Cd2+ occurred at pH=3. The saturated adsorption capacities calculated by Langmuir isotherms were 54.3 mg . g-(1) for Cu2+, 20.4 mg . g(-1) for Cd2+, and 12.4 mg . g(-1) for Ni2+, respectively. The adsorption kinetics were well described by pseudo-second-order equation models. The experimental results showed that the Fe3O4/chitosan modified with ethylenediamine presented higher adsorption selectivity for Cu2+ than for Cd2+ and Ni2+ in all studied pH ranges.

• 出版日期2007-12
• 单位天津大学; 东华理工大学