Br?nsted-acid sites induced photocatalytic cracking of low-polarity polyethylene plastics

扫码查看

原文链接

NETL
NSTL
万方数据

外文摘要：Polyolefins such as polyethylene(PE)are one of the largest-scale synthetic plastics and play a key role in modern society.However,polyethylene is extremely inert to chemical recycling owing to its lack of chemical functionality and low polarity,making it one of the most challenging environmental hazards globally.Herein,we developed a phosphorylated CeO2 catalyst by an organophosphate precursor and fea-tured efficient photocatalysis of low-density polyethylene(LDPE)without the acid or alkaline pre-treatment.Compared to pristine CeO2,the surface phosphorylation allows to introduce Brønsted acid sites,which facilitate to form carbonium ions on LDPE via protonation.In addition,the suitable band structure of the phosphorylated CeO2 catalyst enables efficient photoabsorption and generates reactive oxygen species,leading to the C-C bond cleavage of LDPE.As a result,the phosphorylated CeO2 catalyst exhibited an outstanding carbon conversion rate of＞94％after 48 h of photocatalysis under 50 mW/cm2 of simulated sunlight,with a high CO2 product selectivity of＞99％.Furthermore,the PE microparticles with sizes larger than 10 μm released from LDPE plastic wrap were directly and completely degraded by photocatalysis within 12 h,suggesting an attractive and environmentally benign strategy of utilizing solar energy-based photocatalysis for reducing potential hazards of LDPE plastic trashes.

外文关键词：

Photocatalytic crackingPolyethyleneSurface phosphorylationBrønsted-acid siteCarbon conversion

作者：

Qianyou Wen、Quan Zhang、Zhengzheng Liu、Huining Wang、Shuya Hao、Fan Zhang、Lijuan Zhang、Qing Han、Gengfeng Zheng

展开 >

作者单位：

Laboratory of Advanced Materials,Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials,Fudan University,Shanghai 200438,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of ShanghaiScience and Technology Commission of Shanghai Municipality

项目编号：

22025502U23A2055222379026222229012217502223ZR140700021DZ1206800

出版年：

2024

DOI：

10.1016/j.jechem.2024.05.003

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.96(9)