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环境化学  2015 

水中多壁碳纳米管的凝聚动力学

Keywords: 多壁碳纳米管(MWNTs),凝聚动力学,电解质,腐殖酸

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Abstract:

利用动态光散射技术研究了环境因素对水中多壁碳纳米管(Multi-walledcarbonnanotubes,MWNTs)颗粒凝聚过程的影响.结果表明,投加一价、二价电解质均可使水中MWNTs颗粒Zeta电位减小、水合动力学半径增大,促进颗粒间凝聚的发生;水中MWNTs颗粒的凝聚过程可分为反应控制和扩散控制两个不同阶段,符合经典的胶体稳定性(DLVO)理论.经计算,Na+、K+、Ca2+和Mg2+的临界凝聚浓度分别为221、251、8.0、8.4mmol·L-1.腐殖酸存在可通过空间位阻效应显著增强水中MWNTs的分散性,表明MWNTs可稳定存在于典型的水环境中.

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