摘要
采用溶胶-凝胶法,在甲基化改性的SiO2溶胶中掺杂硝酸银,制备Ag/M-SiO2杂化膜。通过XRD、XPS、紫外-可见吸收谱、N2吸附-脱附以及气体渗透性能测试等方法,考察了银掺杂对杂化膜结构和性能的影响。结果表明,Ag/M-SiO2膜中的银元素完全为纳米金属银,具有面心立方结构。金属银的掺杂对Ag/M-SiO2膜的化学结构基本没有影响,但使其孔径和总孔体积略微增大。与未载银的SiO2膜相比,Ag/M-SiO2膜具有更大的H2渗透速率和更好的H2/CO2选择性。金属银的引入增强了H2的表面扩散作用,促进了H2在膜中的传递,提高了SiO2膜的水汽稳定性。
The silver-doped methyl-modified hybrid silica （Ag/M-SiO2） membranes were prepared using the sol-gel method by adding AgNO3 solution to a methyl-modified silica sol. The influence of Ag-doping on the structure and properties of hybrid silica membranes was investigated by using XRD, XPS, UV-visible absorption spectra, N2 adsorption-desorption measurements and gas permeance experiments. The results show that the silver element in the Ag/M-SiO2 membranes exists in the metallic silver with a face centered cubic lattice. The doping of silver nanoparti cles nearly has no influence on the chemical structure of the methyl modified silica membranes, but can make the mean pore size and total pore volume slightly increase. Compared with the methyl-modified silica membranes without silver doping, the H2 permeance and H2/COe permselectivities of Ag/M-SiO2 membranes are greater. The introduction of metallic silver facilitates the transport of He in silica membranes and improves the steam stability of silica membranes.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2011年第24期80-83,106,共5页
Materials Reports
基金
国家自然科学基金(201103132)
陕西省自然科学基础研究基金(2011JQ2016)
西安工程大学博士科研启动基金(BS1006)
