大气颗粒物的表面电特性和界面酸-碱反应特征平衡常数

大气颗粒物的表面电特性和界面酸-碱反应特征平衡常数

田艳丽¹,侯万国¹^,^2*,周维芝¹,王文兴¹

1 山东大学环境研究院，山东济南 250100；2 山东大学胶体与界面化学教育部重点实验室，山东济南 250100

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-10-24 发布日期:2006-10-24
通讯作者: 田艳丽

Interface electrochemical property and intrinsic surface reaction equilibrium constants of atmospheric particulate matter

TIAN Yan-li¹,HOU Wan-guo¹^,^2*,ZHOU Wei-zhi¹, WANG Wen-xing¹

1. Environment Research Institute, Shandong University, Jinan 250100， Shandong;2. Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Shandong University, Jinan 250100

Received:1900-01-01 Revised:1900-01-01 Online:2006-10-24 Published:2006-10-24
Contact: TIAN Yan-li

摘要/Abstract

摘要： 采用质量滴定法测定了大气颗粒物的零净电荷点(pH(PZNC))，甲醛缩合法测定了结构电荷密度(σst)，进而得到界面酸-碱反应特征平衡常数(1-pK模型中的K，2-pK模型中的Kinta1和Kinta2)。结果表明，所研究的大气颗粒物样品荷结构负电荷，σst=-0.18mmol/g；存在与电解质浓度无关的零净电荷点，pH(PZNC)=8.00；界面酸-碱反应特征平衡常数分别为pK=8.00，pKinta1=2.07和pKinta2=13.93。

关键词: 大气颗粒物, 界面电性质, 界面电离/络合模型 , 酸-碱反应

Abstract: The point of zero net charge (PZNC) and structural charge density (σst) of atmospheric particulate matter were respectively measured by the mass titration and formaldehyde condensation method. The results show that the studied atmospheric particulate matter sample possesses structural negative charges (σst=-0.18mmol/g), and there is a PZNC independent of the electrolyte concentration (pH(PZNC)=8.00). According to pH(PZNC) values, the total density of surface proton-active sites (Ns) and σst, the intrinsic surface reaction equilibrium constants, pK of 1-pK model, pKinta1　and pKinta2 of 2-pK model, were directly calculated respectively to be 8.00, 2.07 and 13.93 for the studied atmospheric particulate matter sample.

Key words: interface ionization/complexation model , acid-basic reaction, interface electrochemical property, atmospheric particulate matter

中图分类号:

X522

田艳丽,侯万国,*,周维芝,王文兴 . 大气颗粒物的表面电特性和界面酸-碱反应特征平衡常数[J]. J4, 2007, 42(11): 15-18 .

TIAN Yan-li,HOU Wan-guo,*,ZHOU Wei-zhi,WANG Wen-xing . Interface electrochemical property and intrinsic surface reaction equilibrium constants of atmospheric particulate matter[J]. J4, 2007, 42(11): 15-18 .

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