Assessing the Stability and Photocatalytic Efficiency of a Biodegradable PLA-TiO2 Membrane for Air Purification

IF 6.5 3区材料科学 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY

Advanced Sustainable Systems Pub Date : 2024-09-18 DOI:10.1002/adsu.202400594

Hadis Mortazavi Milani, Brent Van Neste, Ewoud Cosaert, Dirk Poelman

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Abstract

The potential of a biodegradable polylactic acid (PLA)-TiO₂ membrane for air purification is investigated, utilizing the environmentally friendly solvent Cyrene. Through the integration of TiO₂ nanoparticles within a PLA matrix, the membrane is used to degrade ethanol as a model volatile organic compound (VOC) under UV light. Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDX), and UV–vis spectrophotometry confirm the porous structure of the membrane, the even distribution of TiO_2, and its effective band gap of 3.06 eV, respectively. Ethanol adsorption is best described by the Langmuir isotherm model, suggesting monolayer coverage on a homogeneous surface. Photocatalytic tests demonstrate that the membrane decomposes ethanol (6800 ppm) within 14 min under UV light, generating acetaldehyde, acetic acid, formaldehyde, and formic acid as intermediates, and ultimately producing CO₂ and water. Reusability tests indicate a decrease in decomposition time over successive cycles due to increased TiO₂ exposure from the gradual degradation of PLA. However, this degradation poses challenges for continuous use, compromising the membrane's long-term durability.

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评估用于空气净化的可生物降解聚乳酸-二氧化钛膜的稳定性和光催化效率

本研究利用环保型溶剂烯丙基（Cyrene）研究了可生物降解的聚乳酸（PLA）-二氧化钛膜在空气净化方面的潜力。通过在聚乳酸基质中整合 TiO2 纳米颗粒，该膜可在紫外光下降解乙醇这种典型的挥发性有机化合物（VOC）。扫描电子显微镜（SEM）、能量色散 X 射线分析（EDX）和紫外-可见分光光度法分别证实了膜的多孔结构、TiO2 的均匀分布及其 3.06 eV 的有效带隙。乙醇吸附用 Langmuir 等温线模型进行了最好的描述，表明在均匀的表面上存在单层覆盖。光催化测试表明，在紫外线照射下，该膜可在 14 分钟内分解乙醇（6800 ppm），生成乙醛、乙酸、甲醛和甲酸等中间产物，并最终生成二氧化碳和水。可重复使用性测试表明，由于聚乳酸的逐渐降解增加了二氧化钛的暴露量，在连续循环中分解时间缩短。然而，这种降解对连续使用提出了挑战，影响了膜的长期耐久性。

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来源期刊

Advanced Sustainable Systems Environmental Science-General Environmental Science

CiteScore

10.80

自引率

4.20%

发文量

186

期刊介绍： Advanced Sustainable Systems, a part of the esteemed Advanced portfolio, serves as an interdisciplinary sustainability science journal. It focuses on impactful research in the advancement of sustainable, efficient, and less wasteful systems and technologies. Aligned with the UN's Sustainable Development Goals, the journal bridges knowledge gaps between fundamental research, implementation, and policy-making. Covering diverse topics such as climate change, food sustainability, environmental science, renewable energy, water, urban development, and socio-economic challenges, it contributes to the understanding and promotion of sustainable systems.