光催化水解─聚乳酸化学升级循环的可持续选择

IF 6.7 Q1 ENGINEERING, ENVIRONMENTAL ACS Environmental Au Pub Date : 2023-10-02 DOI:10.1021/acsenvironau.3c00040
Antonia Garratt, Klaudia Nguyen, Alexander Brooke, Martin J. Taylor and Maria Grazia Francesconi*, 
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引用次数: 0

摘要

塑料垃圾是一个重要的全球性问题,目前避免塑料垃圾填埋的策略包括焚烧、气化或热解等高碳排放和高能耗的方法。然而,如果高价值产品,如精细化学品和液体燃料分子,可以从受控的分解中解放出来,塑料废物可以成为一种资源,而不是一个问题。这封信提出了一种低成本,低能量的方法来控制塑料的分解,光催化水解的概念证明。这种方法结合了光解和水解,两者都是缓慢的自然分解过程,光催化过程。光催化剂α-Fe2O3嵌入聚乳酸(PLA)塑料基体中。然后将光催化剂/塑料复合材料浸入水中,并在低能量(25 W)紫外光下照射90小时。作为主要产品的单体丙交酯被生产出来。α-Fe2O3 (6.9 wt %)加速了PLA的降解途径,达到32%的固相转化为液相产物,而在相同条件下,PLA本身不分解。这凸显了塑料废物升级和增值的低能耗途径,比热解的碳密度更低,比自然降解更快。通过直接比较25瓦(0.025千瓦时)的紫外线灯泡和13千瓦时的电炉,光催化反应直接消耗的能量比传统的热化学途径少520倍。此外,该技术还可推广应用于其他塑料,并可使用其他光催化剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Photocatalytic Hydrolysis─A Sustainable Option for the Chemical Upcycling of Polylactic Acid

Plastic waste is a critical global issue, yet current strategies to avoid committing plastic waste to landfills include incineration, gasification, or pyrolysis high carbon emitting and energy consuming approaches. However, plastic waste can become a resource instead of a problem if high value products, such as fine chemicals and liquid fuel molecules, can be liberated from controlled its decomposition. This letter presents proof of concept on a low-cost, low energy approach to controlled decomposition of plastic, photocatalytic hydrolysis. This approach integrates photolysis and hydrolysis, both slow natural decomposition processes, with a photocatalytic process. The photocatalyst, α-Fe2O3, is embedded into a polylactic acid (PLA) plastic matrix. The photocatalyst/plastic composite is then immersed in water and subjected to low-energy (25 W) UV light for 90 h. The monomer lactide is produced as the major product. α-Fe2O3 (6.9 wt %) was found to accelerate the PLA degradation pathway, achieving 32% solid transformation into liquid phase products, in comparison to PLA on its own, which was found to not decompose, using the same conditions. This highlights a low energy route toward plastic waste upgrade and valorization that is less carbon intensive than pyrolysis and faster than natural degradation. By directly comparing a 25 W (0.025 kWh) UV bulb with a 13 kWh furnace, the photocatalytic reaction would directly consume 520× less energy than a conventional thermochemical pathway. Furthermore, this technology can be extended and applied to other plastics, and other photocatalysts can be used.

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ACS Environmental Au
ACS Environmental Au 环境科学-
CiteScore
7.10
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0.00%
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0
期刊介绍: ACS Environmental Au is an open access journal which publishes experimental research and theoretical results in all aspects of environmental science and technology both pure and applied. Short letters comprehensive articles reviews and perspectives are welcome in the following areas:Alternative EnergyAnthropogenic Impacts on Atmosphere Soil or WaterBiogeochemical CyclingBiomass or Wastes as ResourcesContaminants in Aquatic and Terrestrial EnvironmentsEnvironmental Data ScienceEcotoxicology and Public HealthEnergy and ClimateEnvironmental Modeling Processes and Measurement Methods and TechnologiesEnvironmental Nanotechnology and BiotechnologyGreen ChemistryGreen Manufacturing and EngineeringRisk assessment Regulatory Frameworks and Life-Cycle AssessmentsTreatment and Resource Recovery and Waste Management
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