Interaction Influence of Cd(II) and Nano-TiO2 on Aggregation and Adsorption Kinetics toward Marine Algae

ABSTRACT In this study, the interaction influence of Cd(II) and nano-TiO2 on marine algae was studied by observing its aggregation and adsorption kinetics, accumulation of Cd(II) in algae in the presence of TiO2, and as a promoter on Cd(II) toxicity. The results showed that diffusion limited aggregation of TiO2 nanoparticles takes place within 10 min in the absence of Cd(II). In the presence of Cd(II), the rate of aggregate growth is significantly higher than the rate for diffusion-limited aggregation around algae within 5 min, the TiO2 nanoparticles are more stable than in the presence of Cd(II). That is, in the presence of Cd(II), enhanced aggregation occurs of TiO2 nanoparticles. Cd(II) was adsorbed onto algae quickly in the presence TiO2 nanoparticles and equilibrium was reached within 30 min and relatively slow in the absence of Cd(II). The equilibrium concentration of the adsorption of Cd(II) is longer than that of the Cd(II), and TiO2 nanoparticles exist synchronously for the algae, The bioaccumula...