Tao Hu-Chun, Gu Yi-Han, Liu Wei, Huang Shuai-Bin, Cheng Ling, Zhang Li-Juan, Zhu Li-Li, Wang Yong
Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, 518055, China.
Guangdong Provincial Key Laboratory of Nano-Micro Material Research, School of Chemical Biology & Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, China.
Nanoscale Res Lett. 2017 Nov 6;12(1):583. doi: 10.1186/s11671-017-2349-5.
Three kinds of functional monomers, 4-vinylpridine(4-VP), 2-(allylthio)nicotinic acid(ANA), and 2-Acetamidoacrylic acid(AAA), were used to synthetize palladium(II) ion-imprinted polymeric nanospheres (Pd(II) IIPs) via precipitation-polymerization method in order to study the effects of different functional monomers on the adsorption properties of ion-imprinted materials. The results of UV spectra in order to study the interaction between template ion PdCl and functional monomers showed that there were great differences in structure after the template reacted with three functional monomers, 4-VP and ANA caused a large structural change, while AAA basically did not change. Further results on the adsorption performance of Pd(II) IIPs on Pd(II) confirmed 4-VP was the most promising candidate for the synthesis of Pd(II) IIPs with an adsorption capacity of 5.042 mg/g as compared with ANA and AAA. The influence of operating parameters on Pd(II) IIP's performance on Pd(II) adsorption was investigated. There was an increase in the adsorption capacity of Pd(II) IIPs at higher pH, temperature, and initial concentration of Pd(II). The results of multi-metal competitive adsorption experiments showed that Pd(II) IIPs had selectivity for Pd(II). An adsorption equilibrium could be reached at 180 min. Kinetic analysis showed that the adsorption test data fitted best to the pseudo-second order kinetic model, and the theoretical equilibrium adsorption capacity was about 5.085 mg/g. The adsorption isotherms of Pd(II) by Pd(II) IIPs agreed well with the Freundlich equation, suggesting a favorable adsorption reaction under optimal conditions. These results showed that Pd(II) IIPs have potential application in the removal of Pd(II) from aqueous solutions and may provide some information for the selection of functional monomers in the preparation of Pd(II) IIPs.
为了研究不同功能单体对离子印迹材料吸附性能的影响，采用沉淀聚合法，使用三种功能单体4-乙烯基吡啶（4-VP）、2-（烯丙硫基）烟酸（ANA）和2-乙酰氨基丙烯酸（AAA）合成了钯（II）离子印迹聚合物纳米球（Pd（II）IIPs）。为研究模板离子PdCl与功能单体之间的相互作用而进行的紫外光谱结果表明，模板与三种功能单体反应后结构存在很大差异，4-VP和ANA引起了较大的结构变化，而AAA基本没有变化。关于Pd（II）IIPs对Pd（II）吸附性能的进一步结果证实，与ANA和AAA相比，4-VP是合成Pd（II）IIPs最有前景的候选单体，其吸附容量为5.042 mg/g。研究了操作参数对Pd（II）IIPs吸附Pd（II）性能的影响。在较高的pH值、温度和Pd（II）初始浓度下，Pd（II）IIPs的吸附容量有所增加。多金属竞争吸附实验结果表明，Pd（II）IIPs对Pd（II）具有选择性。180分钟时可达到吸附平衡。动力学分析表明，吸附试验数据最符合准二级动力学模型，理论平衡吸附容量约为5.085 mg/g。Pd（II）IIPs对Pd（II）的吸附等温线与Freundlich方程吻合良好，表明在最佳条件下吸附反应良好。这些结果表明，Pd（II）IIPs在从水溶液中去除Pd（II）方面具有潜在应用价值，并可能为制备Pd（II）IIPs时功能单体的选择提供一些信息。
