| Particle concentration effect in adsorption/desorption of Zn(Ⅱ) on anatase type nano TiO_2 |
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| 作者姓名： | YANG Yu-huan CHEN Hao~* PAN Gang State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing China. |
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| 作者单位： | YANG Yu-huan CHEN Hao~* PAN Gang State Key Laboratory of Environmental Aquatic Chemistry，Research Center for Eco-Environmental Sciences，Chinese Academy of Sciences，Beijing 100085，China. |
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| 基金项目： | Project supported by the National Natural Science Foundation of China(No.20537020)，the “Hundred Talent Scientist Program” of the Chinese Academy of Sciences. |
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| 摘 要： | Adsorption/desorption in a new Zn(Ⅱ)-TiO_2 adsorption system was investigated at different particle concentrations(C_p).TEM,SEM and XRD analyses revealed that the TiO_2 particles were an aggregation of nano-sized(approximately 10 nm)pure anatase-type TiO_2. Adsorption experiments were carried out with particle concentrations of 100,400 and 1000 mg/L,and their adsorption isotherms were found to decline successively,showing an obvious C_p effect.Desorption experiments indicated that adsorption in this system was irreversible,and the irreversibility increased with increasing C_p.These phenomena could be explained by the MEA(metastable equilibrium adsorption)theory and the C_p effect could be modeled well with an MEA-Freundlich-type C_p effect isotherm equation. This study may help understand environmental behavior of contaminants on ultrafine natural particles.
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| 关 键 词： | Zn(Ⅱ) anatase-type TiO_2 particle concentrations effect adsorption desorption |
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