Preparation of a Macroporous Silica-Based Pyridine Impregnated Material and Its Adsorption for Palladium
Preparation of a Macroporous Silica-Based Pyridine Impregnated Material and Its Adsorption for Palladium
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DOI：
10.1021/ie1021893
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发表时间：
2011-05
影响因子：
4.2
通讯作者：
A. Zhang;Yaping Zhu;Yunhai Liu;Z. Chai
中科院分区：
文献类型：
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作者：
A. Zhang;Yaping Zhu;Yunhai Liu;Z. Chai
制备了大孔硅基2，6-二（5，6-二（异己基）-1，2，4-三嗪-3-基）吡啶（BDIHTP）多氮分子识别材料BDIHTP/SiO2-P。通过将BDIHTP浸渍并固定到平均直径为50 μm的大孔SiO2-P颗粒载体的孔中来进行。研究了298 K下高活性废液（HLW）中典型的碱金属和碱土金属Cs（I）、Na（I）、K（I）、Rb（I）、Sr（II）、Ba（II）以及贵金属Pd（II）在BDIHTP/SiO2-P材料上的吸附。通过检查接触时间和HNO 3浓度在0.3-5.0 M范围内的影响来进行。BDIHTP/SiO2-P对Pd（II）表现出优异的吸附能力和高的选择性。这是由于Pd（II）作为一种软刘易斯酸和一种电子对受体，与BDIHTP内部的氮、一种软刘易斯碱和一种电子对受体形成了强的化学络合作用。
A macroporous silica-based 2,6-bis(5,6-di(iso-hexyl)-1,2,4-triazine-3-yl)pyridine (BDIHTP) multinitrogen molecular recognition material, BDIHTP/SiO2-P, was prepared. It was performed through impregnation and immobilization of BDIHTP into the pores of the macroporous SiO2-P particle support with a mean diameter of 50 μm. The adsorption of some typical alkali metal and alkaline earths Cs(I), Na(I), K(I), Rb(I), Sr(II), and Ba(II), as well as Pd(II), a representative of precious metals, contained in highly active liquid waste (HLW), onto the BDIHTP/SiO2-P material was investigated at 298 K. It was carried out by examining the effects of contact time and the HNO3 concentration in the range 0.3–5.0 M. BDIHTP/SiO2-P showed excellent adsorption ability and high selectivity for Pd(II) over all the tested metals, which had weak or almost no adsorption. It was attributed to the strong chemical complexation of Pd(II), a soft Lewis acid and an electron-pair acceptor, with nitrogen inside BDIHTP, a soft Lewis base and...