石英相二氧化硅纳米管的制备及其对Pb^2＋的吸附行为研究  

Fabrication of Quartz Phase Silica Nanotubes by Sepiolite and Its Adsorption Property for Pb^(2+)

作　　者：涂全 王芙香 李成阳 陈子玉 任国建 陈祎平 潘勤鹤 张才灵 

机构地区：[1]海南大学材料与化工学院,热带岛屿资源先进材料教育部重点实验室,海口570228

出　　处：《人工晶体学报》2018年第1期57-63,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(21761010),海南自然科学基金(20162018)

摘　　要：本文采用纯化的海泡石作为硅源,在不需要模板和煅烧工艺的条件下,制备出了石英相的硅纳米管(SNTs),并对获得样品进行了XRD、FTIR和SEM等表征。制得的SNTs具有40~50 nm外径,管腔直径为10~15 nm,长度为20~100μm。此外,研究了SNTs对于Pb^(2+)的吸附行为。结果表明,Pb^(2+)吸附量随初始Pb^(2+)浓度,吸附时间,温度和溶液p H值(<5)增加而增加。在溶液p H为5时,SNTs对于Pb^(2+)的吸附平衡的吸附焓(ΔH)和熵变(ΔS)分别为6.28 k J/mol和69.8 J/mol·K。The use of sepiolite as silicon source to fabricate silicon nanotubes （SNTs） without template and calcination was reported here. The obtained SNTs were characterized by XRD, FTIR and SEM. Finally, homogeneous tubular structure of silicon nanotubes has formed with 40-50 nm of outside diameter. The lumen diameter varied from 10 to 15 nm and length changed from 20 to 100 μm. Moreover, silicon nanotubes were used as adsorbents for the removal of Pb^2＋ from aqueous solutions. The results show that the amount of adsorption of Pb^2＋ increased with initial Pb^2＋ concentration, contact time, temperature and solution pH. The values of the enthalpy （AH） and entropy of activation （AS） were 6. 28 kJ/mol and 69.8 J/mol · K, respectively, at pH 5.0.

关 键 词：石英相 二氧化硅纳米管 海泡石 吸附性能 

分 类 号：O613.72[理学—无机化学]