Bo Feng,Yaxuan Jing,Xiaohui Liu,Yong Guo,Yanqin Wang
The upcycling of waste polyvinyl chloride (PVC) is a grand challenge because of the unmanageable Cl species. Here, we develop a Cl-transfer strategy to upcycle waste PVC into value-added organic chlorides and PE-like polymer with various Cl acceptors (tetrahydrofuran, dibutyl ether and butanol) over Ru/Al 2 O 3 catalyst. The high utilization efficiency of Cl (> 80 %) can be obtained over Ru/Al 2 O 3 at 180 °C, 2Mpa H 2 with tetrahydrofuran as an acceptor within tens of hours. The excellent performance is attributed to key features including Al 2 O 3 for the C-O bond activation and metal Ru for C-Cl bond activation and H 2 dissociation. The remaining PE-like polymer after removing Cl could be regarded as PE-like feedstock and further converted into methane through the same Ru/Al 2 O 3 catalyst. The Cl-transfer system also enables the upcycling of several common PVC-contained wastes and works well in the scale-up test. This work offers a catalytic path to integrate waste PVC plastic into the supply chain of organic chlorides under the context of circular economy.
In situ reactivation of hydrogels remains a long-standing key challenge in chemistry and materials science. Herein, we first report an ultraconvenient in situ renewable antibacterial hydrogel prepared via a facile physical contact-triggered strategy based on an ultrafast chlorine transfer pathway. We discover that the as-proposed hydrogel with a programmable 3D network cross-linked by noncovalent bonds and physical interactions can serve as a smart platform for selective active chlorine transfer at the hydrogel/hydrogel interface. Systematic experiments and density functional theory prove that the N-halamine glycopolymers integrated into the hydrogel system work as a specific renewable biocide, permitting the final hydrogel to be recharged in situ within 1 min under ambient conditions. Due to its strength and durability, pathogen specificity, and biocompatibility, coupled with its rapid in situ reactivation, this antibacterial hydrogel holds great potential for in vivo biomedical use and circulating water disinfection. We envision this proposed strategy will pave a new avenue for the development of in situ renewable smart hydrogels for real-world applications.
危险品化学品经营许可证（带存储）