Release behavior and mechanism of candle-shaped persulfate sustained-release material
ZHU Xue-qiang1,2, HUA Gang2, ZHOU Lai1,2, LI Dan-qiong2
1. Engineering Research Center of Mine Ecological Restoration, Ministry of Education, Xuzhou 221116, China; 2. School of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Abstract：Paraffin wax (PW) was selected as the matrix material, and various "candle" shaped persulfate(PS) sustained-release materials (PS@PW) were prepared by melt injection molding condensation method. The release performance of PS was evaluated by static release batch experiment. The results showed that the mass ratio of PS to PW greatly influenced the release performance of PS. After 20days of reaction, the PS release rate was lower than 30% when PS: PW≤1:1, while the PS release rate was higher than 80% when PS:PS>1:1. Under the same ratio of PS to PW, the larger the diameter of PS@PW, the longer the PS release time, but the maximum PS release rate decreased. When PS: PW= 2:1, h=70mm, D=22mm, the longest release time of PS@PW was 36d, and the PS release rate was 92%. The Bhasker and Rigter-Peppas models were used to fit the PS release from PS@PW. Combined with SEM characterization, it was determined that the release mechanism of PS from PS@PW was divided into two stages: surface PS dissolution and internal PS diffusion. It provides a theoretical basis for the application of in-situ oxidation in organically polluted sites.
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