东南大学学报（自然科学版）2016，Vol.46Issue(z1)：230-234,5.DOI:10.3969/j.issn.1001-0505.2016.S1.040
盐溶液对膨润土微观结构的影响
Effects on bentonite microstructure by salt solution
摘要
Abstract
Nitrogen adsorption was conducted at 77 K to obtain the adsorption isotherm on the ben-tonite specimens inundated with distilled water and sodium chloride with different concentrations. Then,according to the adsorption data, the specific surface area, the pore volume, and the surface fractal dimension of bentonite specimens were calculated by BET,BJH and the Neimark thermody-namics methods,respectively. The test results show that with the increase of inundating solution con-centration,the pore volume of bentonite decreases,and the specific surface and surface fractal dimen-sion firstly decreases after an increased. It is found that this is due to the amount of Na+ coating the bentonite surface is different in different NaCl solutions. When the concentration of NaCl solution is higher,the Na+ adsorbed on bentonite surface is higher,and the Na+ will block the pore,leading to a smaller pore volume. Compared with the highly concentrated NaCl solution,a little of Na+ coating on the surface is more likely to cause a higher surface roughness,thus resulting in a high specific surface area and surface fractal dimension in NaCl solution with low concentration.关键词
膨润土/微观结构/N2 吸附/盐溶液Key words
bentonite/microstructure/N2 adsorption/salt solution分类
建筑与水利引用本文复制引用
项国圣,徐永福,谢胜华..盐溶液对膨润土微观结构的影响[J].东南大学学报（自然科学版）,2016,46(z1):230-234,5.基金项目
国家自然科学基金资助项目(41272318) （41272318）
