纳米Fe2O3粉末的表面吸附性能  

Water adsorptive property of nano-sized hematite

作　　者：孙菲[1] 肖庆[1] 刘旭隆[1] 李秋菊[1] 洪新[1] 

机构地区：[1]上海大学材料科学与工程学院,上海市现代冶金与材料制备重点实验室,上海200072

出　　处：《粉末冶金材料科学与工程》2014年第1期24-30,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(50474081)

摘　　要：采用TG-DTA结合XRD等实验方法,研究纳米级Fe2O3粉末的表面吸附性能;分析Fe2O3粉末表面吸附水量及脱附热与纳米颗粒尺寸的依赖关系;利用数学模型结合热力学理论定量描述纳米Fe2O3颗粒的比表面能和表面过剩吉布斯函数,及其随颗粒尺寸的变化关系。结果表明:随纳米Fe2O3颗粒尺寸减小,脱附水的温度区间逐渐增宽,脱水量和脱附热增大;且比表面积的显著增大导致比表面能、表面过剩吉布斯自由能明显升高,纳米颗粒吸附性能增强。The water adsorptive property of nano-hematite was studied using TG-DTA comprehensive analyzer and X-ray diffraction analysis. The size-dependents of surface adsorption capacity and adsorption heat were also analyzed. The specific surface energy was estimated by a mathematical model. The experiment combined with the thermodynamics theory was used to calculate the adsorptive enthalpy and the excess Gibbs free energy. The results show that the water adsorptive quantum and enthalpy increase with decreasing particle size. In addition, the temperature range of desorption is gradually widened with decreasing particle size. The study also shows that the smaller particle size is, the higher the specific surface energy and the surface excess Gibbs free energy are.

关 键 词：纳米Fe2O3 吸附性能 比表面能 表面过剩吉布斯函数 

分 类 号：TQ13[化学工程—无机化工]