水中富勒烯(C_(60))纳米颗粒凝聚动力学研究  

Aggregation Kinetics of Fullerene (C_(60)) Nanoparticles in Aquatic System

作　　者：方华[1] 沈冰冰[1] 孙宇心[1] 王媛[2] 陆继来[2] 

机构地区：[1]南京信息工程大学环境科学与工程学院,江苏南京210044 [2]江苏省环境科学研究院,江苏南京210036

出　　处：《环境科学与技术》2014年第4期11-14,117,共5页Environmental Science & Technology

基　　金：国家水体污染控制与治理科技重大专项课题(2008ZX07101-02-03);江苏省自然科学基金项目资助(BK20100592)

摘　　要：采用动态光散射技术研究了电解质和天然有机物对水中C60纳米颗粒凝聚动力学的影响。结果表明,电解质存在可使水中C60纳米颗粒的|ζ|减小、粒径增大,促进凝聚的发生。C60纳米颗粒凝聚过程分为反应控制和扩散控制2个阶段,符合经典的胶体稳定性(DLVO)理论。Na+、K+、Ca2+和Mg2+的临界凝聚浓度分别为321、295、9.6和6.7 mmol/L,远高于其在水环境中的浓度水平;腐殖酸存在可通过空间位阻效应显著增强水中C60纳米颗粒的分散性;表明C60纳米颗粒可稳定存在于典型的水环境中。Aggregation kinetics of C60 nanoparticles were examined through time-resolved dynamic light scattering. Results showed that the presence of electrolyte made a dramatic decrease in the surface zeta potential and increase in the particle size. The aggregation process of C60 nanoparticles was divided into two parts including reaction limited aggregation and diffusion limited aggregation, which was found to be consistent with classic Derjaguin-Landau-Verwey-Overbeek （DLVO） theory of colloidal stability. Critical coagulation concentration （CCC） of C60 nanoparticles was equal to 321 mmol Na2＋,295 mmol Ka＋, 9.6 mmol Ca2＋ and 6.7 mmol Mg2＋, which was far higher than the electrolyte concentration in natural water. The presence of humic acid enhanced the stability of C60 nanoparticles, which was attributable to steric repulsion. C60 nanoparticles can be relatively stable in typical aquatic environments.

关 键 词：富勒烯(C60) 纳米颗粒 凝聚动力学 电解质 

分 类 号：X131.2[环境科学与工程—环境科学]