富里酸在聚苯乙烯微塑料上的吸附行为

主要探究富里酸(FA)在聚苯乙烯(PS)和HBCD-PS复合物(HBCD-PS)微塑料上的吸附特性与作用机制.结果表明,PS对FA几乎没有吸附效果,然而HBCD的存在显著地促进了FA在HBCD-PS上的吸附行为.W-M颗粒内扩散和Boyd扩散模型证实了HBCD-PS对FA的吸附过程主要受颗粒内扩散控制.HBCD-PS对...

Adsorption behaviors of fulvic acid onto polystyrene microplastics

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.