Hou Hongbin, Yu Demei, Hu Guohe
Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, Ministry of Education, School of Science, and ‡State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University , Xi'an, Shaanxi 710049, People's Republic of China.
Langmuir. 2015 Feb 3;31(4):1376-84. doi: 10.1021/la5032784. Epub 2015 Jan 23.
Four kinds of silver ion-imprinted particles (Ag-IIPs) with different morphologies were prepared by the surface ion-imprinting technology (SIIT) and were used for the selective removal and concentration of silver ions from wastewater. The favorable adsorptivity and selectivity of Ag-IIPs for Ag(+) were confirmed by a series of adsorption experiments at a suitable pH value. The adsorption mechanism was elucidated by analyzing the adsorption isotherms, adsorption thermodynamics, and adsorption kinetics systematically. The Ag(+) adsorption onto the Ag-IIPs was well-described by the Langmuir isotherm model, and it was likely to be a monolayer chemical adsorption. This conclusion was also confirmed by the thermodynamic parameters. Moreover, the adsorption kinetics indicated that the adsorption rate would be controlled jointly by the intraparticle diffusion and the inner surface adsorption process, and the latter process was generally associated with the formation and breaking of chemical bonds. Finally, the effects of different morphologies of the Ag-IIPs for Ag(+) adsorption were also investigated. In aqueous solution, the adsorptivity of the Ag(+) ion-imprinting single-hole hollow particles (Ag-IISHPs) for Ag(+) was highest (80.5 mg g(-1)) because of a specific morphology that features a single hole in the shell. In an oil-water mixture, Ag(+) in the water phase could be adsorbed efficiently by the Ag(+) ion-imprinting Janus hollow particles (Ag-IIJHPs), with emulsifiability originating from the Janus structure.
通过表面离子印迹技术（SIIT）制备了四种不同形态的银离子印迹颗粒（Ag-IIPs），并将其用于从废水中选择性去除和富集银离子。通过在合适pH值下进行的一系列吸附实验，证实了Ag-IIPs对Ag(+)具有良好的吸附性和选择性。通过系统分析吸附等温线、吸附热力学和吸附动力学，阐明了吸附机理。Ag(+)在Ag-IIPs上的吸附符合Langmuir等温线模型，可能是单层化学吸附。热力学参数也证实了这一结论。此外，吸附动力学表明，吸附速率将由颗粒内扩散和内表面吸附过程共同控制，而后一过程通常与化学键的形成和断裂有关。最后，还研究了不同形态的Ag-IIPs对Ag(+)吸附的影响。在水溶液中，由于壳层具有单孔的特殊形态，Ag(+)离子印迹单孔空心颗粒（Ag-IISHPs）对Ag(+)的吸附性最高（80.5 mg g(-1)）。在油水混合物中，水相中的Ag(+)可被具有Janus结构且具有乳化性的Ag(+)离子印迹Janus空心颗粒（Ag-IIJHPs）有效吸附。
