Elvington Mark C, Taylor-Pashow Kathryn M L, Tosten Michael H, Hobbs David T
Savannah River Consulting, L.L.C.
Savannah River National Laboratory;
J Vis Exp. 2016 Feb 23(108):53248. doi: 10.3791/53248.
This paper describes the synthesis and peroxide-modification of nanosize monosodium titanate (nMST), along with an ion-exchange reaction to load the material with Au(III) ions. The synthesis method was derived from a sol-gel process used to produce micron-sized monosodium titanate (MST), with several key modifications, including altering reagent concentrations, omitting a particle seed step, and introducing a non-ionic surfactant to facilitate control of particle formation and growth. The resultant nMST material exhibits spherical-shaped particle morphology with a monodisperse distribution of particle diameters in the range from 100 to 150 nm. The nMST material was found to have a Brunauer-Emmett-Teller (BET) surface area of 285 m(2)g(-1), which is more than an order of magnitude higher than the micron-sized MST. The isoelectric point of the nMST measured 3.34 pH units, which is a pH unit lower than that measured for the micron-size MST. The nMST material was found to serve as an effective ion exchanger under weakly acidic conditions for the preparation of an Au(III)-exchange nanotitanate. In addition, the formation of the corresponding peroxotitanate was demonstrated by reaction of the nMST with hydrogen peroxide.
本文描述了纳米钛酸钠（nMST）的合成及过氧化物改性，以及用金（III）离子负载该材料的离子交换反应。合成方法源自用于制备微米级钛酸钠（MST）的溶胶 - 凝胶法，并做了几个关键修改，包括改变试剂浓度、省略颗粒晶种步骤以及引入非离子表面活性剂以利于控制颗粒形成和生长。所得的nMST材料呈现球形颗粒形态，粒径单分散分布在100至150纳米范围内。发现nMST材料的比表面积为285 m²g⁻¹，比微米级MST高一个数量级以上。nMST的等电点测得为3.34个pH单位，比微米级MST测得的pH单位低一个pH单位。发现nMST材料在弱酸性条件下可作为制备金（III）交换纳米钛酸盐的有效离子交换剂。此外，通过nMST与过氧化氢反应证明了相应过氧钛酸盐的形成。
