摘要
分析与探讨了粉石英的表面位及其质子化反应 ,对粉石英的表面电化学性质作了进一步研究。以NaNO3为支持电解质 ,测得粉石英的表面位密度约为 4 3个 /nm2 ,表面零质子电荷原点pHPPZC为 2 8;表面质子化本征常数lgKint1约为 -1 5和lgKint2 约为 7 0 ;Cl-和NO- 3对石英的竞争吸附能力大小为Cl- >NO- 3。粉石英表面显弱酸性。
The surface sites of tripoli (α-quartz) and its protonation are first analyzed and discussed, and then the surface electrochemical properties of tripoli are further investigated. The surface site density and the pH PPZC(pristine of zero charge) of tripoli (α-quartz) were determined in supporting electrolyte solution of NaNO 3 to 43 sites/nm2,28,respectively.The lgK int 1 and lgK int 2, two surface protonation intrinsic constants of tripoli,are about -15, 70, respectively. The competing adsorption ability of Cl- and NO- 3 ions on quartz surface in sequence was Cl->NO- 3.The results show that the surface of tripoli is characteristic of weak acidity.
出处
《桂林工学院学报》
CAS
2001年第2期157-161,共5页
Journal of Guilin University of Technology
基金
广东省博士后科学基金项目
华南理工大学自然科学基金项目!(E5- 30 2 - 0 80 )
