Haoze Li, Shan Jiang, Shan He, Yingbing Zhang, Ye Chen, Li Wang, Jianping Yang
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引用次数: 0
摘要
用传统的化学方法降解聚烯烃(PE)塑料需要高压和高温,但会产生复杂的产物。本文合理制备了富含硫空位的 ZnIn2S4 和富含羟基的 ZnIn2S4,在温和条件下实现了水溶液中 PE 的光催化降解。系统实验证实,羟基和 S 空位的协同作用有助于提高塑料废弃物的光催化降解性能。深入研究表明,活性自由基攻击(h+ 和 -OH)聚乙烯链的薄弱点(C-H 键和 C-C 键),形成 CO2,并进一步选择性地光降解为 CO。多模块协同串联催化技术可进一步提高塑料废弃物的利用价值;例如,塑料降解过程中生成的 CO2/CO 可通过与电催化技术相结合,就地转化为 HCOOH。
Accelerated Solar-Driven Polyolefin Degradation via Self-Activated Hydroxy-Rich ZnIn2S4.
Degradation of polyolefin (PE) plastic by a traditional chemical method requires a high pressure and a high temperature but generates complex products. Here, sulfur vacancy-rich ZnIn2S4 and hydroxy-rich ZnIn2S4 were rationally fabricated to realize photocatalytic degradation of PE in an aqueous solution under mild conditions. The results reveal that the optimized photocatalyst could degrade PE into CO2 and CO, and PE had a weight loss of 84.5% after reaction for 60 h. Systematic experiments confirm that the synergetic effect of hydroxyl groups and S vacancies contributes to improve the photocatalytic degradation properties of plastic wastes. In-depth investigation illustrates that the active radicals attack (h+ and •OH) weak spots (C-H and C-C bonds) of the PE chain to form CO2, which is further selectively photoreduced to CO. Multimodule synergistic tandem catalysis can further improve the utilization value of plastic wastes; for example, product CO2/CO in the plastic degradation process can be converted in situ into HCOOH by coupling with electrocatalytic technology.
期刊介绍:
Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including:
- Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale
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- Modeling and simulation of synthetic, assembly, and interaction processes
- Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance
- Applications of nanoscale materials in living and environmental systems
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