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个人信息Personal Information
教授
博士生导师
硕士生导师
性别:女
毕业院校:中科院大连化学物理研究所
学位:博士
所在单位:环境学院
学科:环境科学与工程. 环境工程. 环境科学
办公地点:环境楼B511
电子邮箱:quzhenping@dlut.edu.cn
The Formation Mechanism of Ag/SBA-15 Nanocomposites Prepared via In-Situ pH-Adjusting Method
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论文类型:期刊论文
发表时间:2013-07-01
发表刊物:JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
收录刊物:SCIE、EI、PubMed、Scopus
卷号:13
期号:7
页面范围:4573-4580
ISSN号:1533-4880
关键字:Ag/SBA-15; In-Situ Synthesis; pH-Adjusting; Mesoporous Materials; The Formation Mechanism
摘要:In this paper, the mesostructures and formation mechanism of Ag/SBA-15 nanocomposites by in-situ "pH-adjusting" method were studied. Characterization results, such as X-ray powder diffraction, N-2 adsorption-desorption isotherms and Transmission electron microscope, showed that the resultant materials exhibited highly ordered hexagonal mesoporous structures, which were strongly correlated to the pH values in the synthesis solution. The pH value also strongly affected the incorporation of silver nanoparticles into the channels. When the pH value of the solution was <= 7.5, the highly ordered Ag/SBA-15 nanocomposites were synthesized successfully; moreover, more and more Ag(NH3)(+) reacts with Si-OH groups in the channels, which resulted in the increase of silver nanoparticles in the channels with the increase of the pH value. Further increasing the pH value, overmuch OH- reacts with Ag+, leading to the decrease of the coated Ag species and the structural order of Ag/SBA-15 nanocomposites. It was found that silver ions could be automatically reduced to silver atoms during the crystallization procedure.