摘要
采用机械搅拌与超声波的技术提纯凹凸土,提高凹凸土的纯度以改善其分散性。并用透射电子显微镜(TEM)、扫描电子显微镜(SEM)观察了凹凸土的显微结构,用Image Pro Plus软件对TEM图片进行凹凸土粒径和长度分布分析,用德国生产NETZSCHTG209对凹凸土进行了热失重分析。实验结果表明,与商品凹凸土相比较,提纯凹凸土中的杂质明显减少,凹凸棒更细更短,分散更均匀;商品凹凸棒土的长度在400～1000nm,平均在700nm左右,宽度在10～35nm,平均在20nm左右;提纯凹凸棒土的长度也在400～1000nm,平均在700nm左右,宽度在5～30nm,平均在15nm左右,提纯凹凸土的长度、粒径比商品凹凸棒土的长度、粒径分布更集中;提纯凹凸土和商品凹凸土的热失重性质相差不大,凹凸土热失重曲线有4个突变,温度达到780℃时,失重达17%左右。
Attapulgite was purified by mechanical stir and ultrasonic wave in order to improve its purity and enhance its dispersibility. The microscopic structures of attapulgite were studied by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM); TEM photos of attapulgite were treated with Image-Pro-Plus software in order to get distributions of its width and length; the thermal gravimetric analysis(TGA) of attapulgite was done by NETZSCH TG209 made in Germany. The experimental results showed that the purified attapulgite has less impurity, more thin and more short than the commercial attapulgite, its dispersion is more even. The length distribution of crude attapulgite is mostly 400～1000nm, the average is about 700nm, the width distribution is 10～35nm, the average is about 20nm,the length distribution of purified attapulgite is also 400～1000nm, the average is about 700nm, the width distribution is 5～30nm, the average is about 15nm, thus, distributions of length and width of the purified attapulgite are more narrow than that of the commercial attapulgite. It isn't different between thermal loss mass of purified attapulgite and that of commercial attapulgite, thermal loss mass curve has four obvious changes. when temperature reaches 780℃, its loss mass is about 17%.
出处
《化工科技》
CAS
2003年第5期11-14,共4页
Science & Technology in Chemical Industry
基金
上海纳米专项基金资助项目(0152nm030)。
关键词
凹凸土
纯化技术
分散性
粒径分布
纳米材料
硅酸盐
Attapulgite
Purifying technique
Dispersity
Distribution of particles width
Nano-material
