Aggregation Kinetics of Fullerene-C60 and Layered Double Hydroxides
To investigate the aggregation state changes that occur when nanoparticles enter the environment and interact with inorganic minerals,a laboratory experiment was conducted with two types of layered double hydroxides,namely MgAl-LDH20 and MgAl-LDH90,were prepared at respectively 20 ℃ and 90 ℃,meantime the aggregation kinetics of both single and mixed nanoparticle of fullerene-C60 were studied using Zeta potential(ζ)analysis techniques.Consequently,the experi-ment showed that the critical aggregation concentration(CCC)values of MgAl-LDH20 and MgAl-LDH90 were 209.12 mmol/L and 166.27 mmol/L,respectively;the Zeta potential(ζ)of MgAl-LDHs suspension was significantly de-creased after being mixed with C60 suspension at different ratios(120∶1,60∶1,30∶1),and the decline degree of ζ increased with the raising of C60 concentration;and thekfastof MgAl-LDH was＜3 in the single system,while thekfastof the mixed system was＞3 after being added with C60,which suggested that the aggregation of the particles was accelerated due to the electrostatic interactions between MgAl-LDHs and C60,and the presence of MgAl-LDHs could slow down the mobility of C60 in the aqueous environment.Moreover,the stability of the mixed suspension system was determined by MgAl-LDHs when only a few amounts of C60 entered the LDHs suspension system.
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