四川盆地大气层中矿物颗粒-甲苯-Cr^(3+)耦合规律模拟研究  

Simulation study on the interactions of mineral particles-toluene-Cr for Sichuan Basin atmosphere

作　　者：叶海燕 董发勤[2] 边亮 何辉超[1,2] YE Hai-yan;DONG Fa-qin;BIAN Liang;HE Hui-chao(School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China;Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳621010

出　　处：《岩石矿物学杂志》2021年第5期1001-1009,共9页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金重点项目(41831285);西南科技大学研究生创新基金(20ycx0017)。

摘　　要：四川盆地大气层具有湿度高和流通性弱的特征,冬春低温季节易形成雾霾。本文着重构建了低温高湿条件下的石英、方解石纳米颗粒与甲苯、Cr^(3+)共存体系,系统测试了石英、方解石颗粒与甲苯、Cr^(3+)耦合前后Zeta电位值、胶体粒径及团聚形态、亲疏水性的变化趋势,以模拟研究四川盆地低温高湿静稳大气环境中矿物颗粒、有机物、重金属离子之间的耦合作用规律。研究发现:甲苯、Cr^(3+)与石英、方解石之间存在显著的成键耦合作用,甲苯、Cr^(3+)存在时会大幅度降低高湿度环境中石英、方解石颗粒的Zeta电位值,增大两种矿物颗粒在低温条件下的活跃度;Cr^(3+)可通过静电作用力,促使石英、方解石颗粒在高湿度环境中形成粒径更大的团聚状胶体;甲苯吸附在石英和方解石颗粒表面会增强其疏水性,减弱高湿度水分对矿物胶体稳定性的侵扰。上述有关石英/方解石颗粒、甲苯、Cr^(3+)在低温高湿条件下的界面成键耦合作用规律发现,对理解四川盆地雾霾形成机制有积极的启发意义。The typical characteristics of Sichuan Basin atmosphere are high humidity and weak mobility,where haze is easily formed during the winter and spring seasons. Here,the interactions system of quartz and calcite nanoparticles with toluene and Cr^(3+) in low temperature and high humidity conditions were systematically investigated.Based on the changes in the Zeta potential,colloid size and aggregated morphology,hydrophilic and hydrophobic properties after the quartz and calcite particles coupling with toluene and Cr^(3+) ,we modeled that:(1) Since a significant inter-coupling effect between the toluene and Cr^(3+) with quartz and calcite,the presence of toluene and Cr^(3+) can greatly reduce the Zeta potential of quartz and calcite particles in high humidity environment,and results in the instability of quartz and calcite particles at low temperature;(2) By its electrostatic force,Cr^(3+) can promote quartz and calcite particles to form agglomerated colloids with larger particle size in high humidity environment;(3) Toluene adsorbed on quartz and calcite particles can enhance their hydrophobicity,and thus weaken the disturbance of water on the stability of quartz or calcite particles-based colloids. The aforementioned findings could provide positive enlightening significance for understanding the mechanism of haze formation in Sichuan Basin from the angle of the inter-coupling of quartz and calcite particles with toluene and Cr^(3+) .

关 键 词：雾霾 石英 方解石 甲苯 CR3+ 耦合作用 四川盆地 

分 类 号：P579[天文地球—矿物学]