微塑料
聚烯烃
材料科学
多孔性
光热治疗
光催化
矿化(土壤科学)
聚乙烯
化学工程
润湿
光降解
图层(电子)
纳米技术
复合材料
化学
环境化学
有机化学
催化作用
工程类
氮气
作者
Jiaqi Zhao,Peng Miao,Xuerui Zhang,Pu Wang,Zhenhua Li,Li‐Zhu Wu,Run Shi,Tierui Zhang
标识
DOI:10.1002/adma.202400681
摘要
Abstract Photo‐mineralization of microplastics under mild conditions has emerged as a promising solution to plastic waste disposal. However, the inadequate contact between oxygen, water‐insoluble polyolefin microplastics, and photocatalysts remains a critical issue. In this study, a TiO 2 hierarchical porous layer (TiO 2 ‐HPL) photocatalyst is presented to establish air‐plastic‐solid triphase interfaces for the photothermal mineralization of polyolefins. The wettability of the TiO 2 ‐HPL‐based triphase interface is finely controlled from plastophobic to plastophilic. High‐resolution imaging and finite element simulation demonstrate the significance of a semiwetting state in achieving multidirectional oxygen diffusion through the hierarchical pore structure while maintaining sufficient contact between the plastic phase and photocatalysts. For low‐density polyethylene, the TiO 2 ‐HPL achieves a photothermal mineralization rate of 5.63 mmol g −1 h −1 and a conversion of 26.3% after 20 h of continuous irradiation. Additionally, the triphase photocatalytic system with semiwetting gas‐plastic‐solid interfaces shows good universality for various polyolefin reagents and products, illustrating its potential in achieving efficient photothermal mineralization of non‐degradable microplastics.
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