Incorporation of TiO2 and TiO2-Ag Nanoparticles in Recycled High-Density Polyethylene: Effect of the Type of Photocatalyst and Incorporation Method on Photocatalytic Activity for the Decomposition of NO

IF 4.7 3区 工程技术 Q2 ENGINEERING, ENVIRONMENTAL Journal of Polymers and the Environment Pub Date : 2024-07-30 DOI:10.1007/s10924-024-03363-w
Dayana Gavilanes, Francisco A. Cataño, Luis Quiles-Carrillo, Rafael Balart, Marcela Saavedra, Alexandre Carbonnel, Herman A. Murillo, Carlos Loyo, Paula A. Zapata
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Abstract

This work reported two types of photocatalysts in polymeric sheets derived from recycled high-density polyethylene (HDPEr): anatase TiO2 and Ag-decorated anatase TiO2 (TiO2-Ag). The Ag nanoparticles were deposited on the TiO2 nanoparticles via chemical reduction using formaldehyde as the reducing agent, although XPS analysis indicated that anatase was also reduced during Ag deposition. The sheets were prepared using two methods: extrusion and a plasma immersion process. In the first one, nanoparticles were introduced during extrusion, resulting in photocatalyst/HDPEr composites. On the other hand, the plasma method involved depositing photocatalyst nanoparticles into the polymer sheet surface through a two-step process of air plasma treatment followed by immersion in an aqueous photocatalyst suspension. The composites obtained through extrusion exhibited a higher Young’s modulus compared to neat HDPEr, attributed to the reinforcing effect of the nanoparticles, which was more significant with the incorporation of TiO2 nanoparticles. Photocatalytic activity assessment revealed that sheets obtained by extrusion showed poor performance, whereas photocatalyst deposition on sheets significantly enhanced NOx photodegradation. Notably, TiO2-Ag nanoparticles exhibited superior photocatalytic activity, with the polymeric sheet containing TiO2-Ag nanoparticles on the surface achieving the highest activity (~ 23.67% NOx photodegradation). The detailed methodology and robust experimental data provided offer valuable insights into optimizing nanoparticle incorporation techniques to enhance the functional properties of recycled polymeric materials for environmental applications. Overall, although the plasma treatment did not affect the mechanical properties of the sheets significantly, it allows an outstanding advance in NOX abatement. Especially for the TiO2-Ag-modified sheets. Based on this background, this research addresses a double environmental approach by developing self-cleaning building panels from HDPEr.

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在回收高密度聚乙烯中掺入 TiO2 和 TiO2-Ag 纳米粒子:光催化剂类型和掺入方法对分解 NO 的光催化活性的影响
这项研究报告了回收高密度聚乙烯(HDPEr)聚合物薄片中的两种光催化剂:锐钛型二氧化钛(TiO2)和银饰锐钛型二氧化钛(TiO2-Ag)。虽然 XPS 分析表明锐钛矿在银沉积过程中也被还原,但银纳米粒子是通过以甲醛为还原剂的化学还原法沉积在二氧化钛纳米粒子上的。片材的制备有两种方法:挤压法和等离子浸泡法。第一种方法是在挤压过程中引入纳米颗粒,从而得到光催化剂/高密度聚乙烯复合材料。另一方面,等离子体法是通过空气等离子体处理和浸入光催化剂水悬浮液两个步骤,将光催化剂纳米粒子沉积到聚合物片材表面。与纯高密度聚乙烯相比,通过挤压获得的复合材料显示出更高的杨氏模量,这归因于纳米粒子的增强效应,而掺入 TiO2 纳米粒子后,增强效应更为显著。光催化活性评估显示,通过挤压获得的片材性能较差,而在片材上沉积光催化剂可显著提高氮氧化物的光降解性能。值得注意的是,TiO2-Ag 纳米颗粒表现出更高的光催化活性,其中表面含有 TiO2-Ag 纳米颗粒的聚合物薄片的光催化活性最高(约 23.67% 的氮氧化物光降解率)。详细的研究方法和可靠的实验数据为优化纳米粒子掺入技术,提高再生聚合物材料在环境应用中的功能特性提供了宝贵的见解。总之,虽然等离子处理对板材的机械性能没有显著影响,但它在减少氮氧化物方面取得了突出进展。尤其是对二氧化钛-银改性板材而言。在此背景下,本研究通过开发高密度聚乙烯自清洁建筑板材来解决双重环保问题。
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来源期刊
Journal of Polymers and the Environment
Journal of Polymers and the Environment 工程技术-高分子科学
CiteScore
9.50
自引率
7.50%
发文量
297
审稿时长
9 months
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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