Highly selective adsorption of Pt2+ and Pd2+ using thiol-functionalized mesoporous silica
Highly selective adsorption of Pt2+ and Pd2+ using thiol-functionalized mesoporous silica
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DOI：
10.1021/ie030590k
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发表时间：
2004-03-17
影响因子：
4.2
通讯作者：
Yi, J
中科院分区：
文献类型：
--
作者：
Kang, T;Park, Y;Yi, J
通过在有序介孔氧化硅SBA-15表面接枝巯基官能团（3-巯丙基）三甲氧基硅烷（MPTMS），制备了具有均匀介孔孔道的贵金属离子（Pt 2+和Pd 2+）吸附剂。结果表明，改性后的SBA-15保持了有序的介孔结构，巯基主要固定在介孔通道内，Brunauer-Emmett-Teller比表面积、小角X射线散射、傅里叶变换红外光谱和元素分析结果证明了这一点。硫醇化介孔二氧化硅对贵金属离子如Pd 2+和Pt 2+表现出高度选择性的吸附能力，而对其他金属离子（Ni 2+、Cu 2+和Cd 2+）的结合能力在等摩尔和10倍过量条件下都大大降低。通过热力学计算解释了硫醇化介孔吸附剂对贵金属离子（Pt 2+和Pd 2+）的选择性吸附，认为选择性吸附是通过在受限孔道表面的化学吸附进行的。此外，硫醇化介孔材料的吸附特性进行了检查。
A noble metal ion (Pt2+ and Pd2+) adsorbent with uniform mesopore channels was prepared by grafting a thiol functional group, (3-mercaptopropyl)trimethoxysilane (MPTMS), onto ordered mesoporous silica, SBA-15. Results show that the ordered mesostructure of SBA-15 was retained after modification and the thiol functional group was immobilized mainly inside the mesopore channel, as evidenced by Brunauer-Emmett-Teller surface area, small-angle X-ray scattering, Fourier transform infrared, and elemental analyses. The thiolated mesoporous silica exhibited a highly selectively adsorptive capability for noble metal ions such as Pd2+ and Pt2+, while the binding capability for other metal ions (Ni2+, Cu2+, and Cd2+) both in the presence of equimolarity and at 10 times excess conditions was greatly decreased. These selective adsorptions of thiolated mesoporous adsorbent for noble metal ions (Pt2+ and Pd2+) were explained by thermodynamic calculation assuming that the selective adsorption occurred by a chemical adsorption on the surface of a confined pore channel. In addition, the adsorption characteristics of the thiolated mesoporous material were examined.