| Abstrakt: |
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 °C and 90 °C, meantime the aggregation kinetics of both single and mixed nanoparticle of fullerene-C60 were studied using Zeta potential (ζ) analysis techniques. Consequently, the experiment 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 decreased 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 the kfast of MgAl-LDH was <3 in the single system, while the kfast of 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. [ABSTRACT FROM AUTHOR] |
