期刊
POLYMERS
卷 13, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/polym13070999
关键词
microplastics; HDPE; microbeads; photocatalysis; scavengers; C; N-TiO2; remediation; nanotechnology; plastic pollution; visible light photodegradation
资金
- Mexican Council for Science and Technology (CONACYT) [PN-2017/5167]
- Program for Teacher Professional Development for the Superior Type of Mexican Secretary of Public Education [511-6/18-892]
- UANL's PAICYT [IT1277-20]
- Universidad Autonoma de Nuevo Leon
The research demonstrates that hydroxyl, holes, superoxide ion, and electrons can act as key radicals in the degradation of high-density polyethylene microplastics using a photocatalytic process, with free hydroxyl generated through electrons playing an important role in the degradation process.
Microplastics (MPs) are distributed in a wide range of aquatic and terrestrial ecosystems throughout the planet. They are known to adsorb hazardous substances and can transfer them across the trophic web. To eliminate MPs pollution in an environmentally friendly process, we propose using a photocatalytic process that can easily be implemented in wastewater treatment plants (WWTPs). As photocatalysis involves the formation of reactive species such as holes (h(+)), electrons (e(-)), hydroxyl (OH?), and superoxide ion (O-2(?-)) radicals, it is imperative to determine the role of those species in the degradation process to design an effective photocatalytic system. However, for MPs, this information is limited in the literature. Therefore, we present such reactive species' role in the degradation of high-density polyethylene (HDPE) MPs using C,N-TiO2. Tert-butanol, isopropyl alcohol (IPA), Tiron, and Cu(NO3)(2) were confirmed as adequate OH?, h(+), O-2(?-) and e(-) scavengers. These results revealed for the first time that the formation of free OH? through the pathways involving the photogenerated e(-) plays an essential role in the MPs' degradation. Furthermore, the degradation behaviors observed when h(+) and O-2(?-) were removed from the reaction system suggest that these species can also perform the initiating step of degradation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据