J. Quezada-Urbina, A. Torres-Islas, E. Vázquez-Vélez
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引用次数: 0
摘要
对清洁水日益增长的需求推动了废水中染料去除可持续技术的发展。本研究研究了再生聚乳酸（PLA）薄膜和PLA- ceo 2纳米复合材料作为等离子体辅助降解亚甲基蓝（MB）的催化介质。在降解实验之前，使用常压电晕放电对薄膜进行表面活化。在循环经济框架内，使用回收PLA有助于废物增值。利用拉曼光谱、x射线衍射（XRD）和原子力显微镜（AFM）对聚乳酸薄膜进行表面分析，结果表明等离子体活化诱导了聚乳酸薄膜的链断裂，提高了薄膜的结晶度，提高了薄膜的表面粗糙度。在PLA-CeO 2纳米复合材料中，等离子体处理增加了纳米颗粒的可及性，同时保持了聚合物的结构完整性。采用常压空气电晕放电在连续流等离子体-液体系统中降解亚甲基蓝。在这些条件下，等离子体处理的PLA薄膜作为催化剂，在70分钟内实现了MB的完全降解（~ 100%）。等离子体处理的PLA-CeO 2膜表现出快速的初始降解，在20分钟后达到约90%的去除率，随后在60分钟后达到约96%的较慢阶段。等离子体活化PLA的高催化活性归因于等离子体诱导的水解和有利于非均相氧化过程的活性表面位点的产生。值得注意的是，等离子体处理的PLA薄膜的降解效率与含有CeO 2的复合材料相当。据我们所知，这是第一份证明等离子体活化聚合物底物在染料降解中的直接催化作用的报告，将回收PLA定位为等离子体辅助废水处理的可持续、低成本平台。此图像的替代文本可能是使用AI生成的。
Surface Activation of PLA and PLA-CeO₂ Films by Atmospheric Pressure Air Plasma for Catalytic Water Treatment
The growing demand for clean water is driving the development of sustainable technologies for dye removal from wastewater. In this study, recycled polylactic acid (PLA) films and PLA-CeO₂ nanocomposites were investigated as catalytic media for plasma-assisted degradation of methylene blue (MB). Before degradation experiments, the films were surface-activated using an atmospheric-pressure corona discharge. The use of recycled PLA contributes to waste valorization within a circular economy framework. Surface analyses by Raman spectroscopy, X-ray diffraction (XRD), and atomic force microscopy (AFM) showed that plasma activation induces chain scission, increases crystallinity, and enhances surface roughness in PLA films. In PLA-CeO₂ nanocomposites, plasma treatment increases nanoparticle accessibility while preserving polymer structural integrity. Methylene blue degradation was carried out in a continuous flow plasma-liquid system using an atmospheric-pressure air corona discharge. Under these conditions, plasma-treated PLA films served as catalysts, achieving complete MB degradation (~100 %) within 70 minutes. Plasma-treated PLA-CeO₂ films showed a rapid initial degradation, achieving approximately 90% removal after 20 minutes, followed by a slower phase reaching approximately 96% after 60 minutes. The high catalytic activity of plasma-activated PLA is attributed to plasma-induced hydrolysis and the generation of reactive surface sites that favor heterogeneous oxidation processes. Notably, plasma-treated PLA films exhibited degradation efficiencies comparable to those of CeO₂ containing composites. To the best of our knowledge, this is the first report to demonstrate the direct catalytic role of a plasma-activated polymeric substrate in dye degradation, positioning recycled PLA as a sustainable, low-cost platform for plasma-assisted wastewater treatment.
Graphical Abstract
The alternative text for this image may have been generated using AI.
期刊介绍：
The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.
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