Abstract：Adsorption properties and interaction mechanisms of fulvic acid (FA) onto polystyrene (PS) and HBCD-PS composites (HBCD-PS) microplastics were investigated. Results show that the adsorption amounts of FA onto PS microplastics were negligible, while the presence of HBCD significantly enhanced the adsorption of FA onto HBCD-PS microplastics which, as confirmed by W-M intra particles and Boyd diffusion models, was mainly dominated by intra-particle diffusion. The FA adsorption onto HBCD-PS closely conformed to the pseudo-second-order and the Freundlich models. The solution pH and NaCl contents significantly affected the adsorption amounts of FA onto HBCD-PS. Overall, HBCD-PS mainly combined with FA through hydrophobic and electrostatic interactions. Besides, the presence of heavy metal ions (Cu(Ⅱ), Pb(Ⅱ), Zn(Ⅱ) and Cd(Ⅱ)) enhanced the adsorption capacities of FA onto HBCD-PS, which was positively correlated with their complexation ability.
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