Dielectric barrier discharge plasma aging of microplastics and its effect on Zn(II) adsorption
LU Wei1, SANG Wen-jiao1, LI Min2, ZHANG Wen-bin1, JIA Dan-ni1, ZHAN Cheng1, HE Yong-jian1, CHEN Cui-zhen2, XIANG Xue-lian3
1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China; 2. Wuhan Water Science Research Institute, Wuhan 430014, China; 3. Yichang Institute of Urban Planning & Design Co., Ltd, Yichang 443001, China
Abstract：In order to shorten the aging time of microplastics and mimic the natural aging conditions in the experiment, dielectric barrier discharge (DBD) plasma was used in the aging experiments of polyethylene microplastics (PE-MP) and polypropylene microplastics (PP-MP). And the adsorption process and mechanism of Zn(II) on PE-MP and PP-MP before and after aging was investigated. With the extension of discharge time and the elevation of input voltage, tiny cracks or holes appeared on the surface of microplastics and oxygen-containing functional groups were formed. The Zn(II) adsorption capacity of aged PE-MP and PP-MP was increased by 22.7% and 14.8%, respectively. The adsorption of Zn(II) on microplastics before and after aging conformed to the pseudo-second-order kinetic model. The intra-particle diffusion model showed that the adsorption process of Zn(II) on microplastics could be involved three processes:rapid adsorption, slow adsorption and adsorption equilibrium. In addition, the adsorption of Zn(II) on microplastics before and after aging conformed by Langmuir model. The thermodynamic results indicated that the adsorption of Zn(II) on microplastics was a spontaneous endothermic process. Ca2+, humic acid and low pH were not conducive to the adsorption of Zn(II) by microplastics.
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