S-scheme construction boosts highly active self-supporting CeO2/Cu2O photocatalyst for efficient degradation of indoor VOCs

被引：45

作者：

Ying, Tiantian ^{[1
]}

Liu, Wei ^{[1
]}

Yang, Lixia ^{[1
]}

Zhang, Shuqu ^{[1
]}

Wu, Ziyi ^{[1
]}

Li, Jinyang ^{[1
]}

Song, Renjie ^{[1
]}

Dai, Weili ^{[1
]}

Zou, Jianping ^{[1
]}

Luo, Shenglian ^{[1
]}

机构：

[1] Nanchang Hangkong Univ, Key Lab Jiangxi Prov Persistent Pollutants Control, Nanchang 330063, Jiangxi, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2024年 / 330卷

基金：

中国国家自然科学基金;

关键词：

S-scheme; CeO2/Cu2O/Cu; Photocatalytic degradation; Indoor VOCs; Self-supporting heterojunctions; NANOCOMPOSITES; HETEROJUNCTION; QUALITY; CEO2;

D O I：

10.1016/j.seppur.2023.125272

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Photocatalyst-governing degradation of VOCs emitted from household products is promising due to its high performance and long-term durability. In this study, unique hierarchical CeO2/Cu2O nanowire arrays with Sscheme construction grow on a Cu mesh through a simple wet chemical method. Abundant oxygen vacancies on CeO2 work as adsorption sites, and the effective separation of photogenerated carriers driven by built-in electric field in the S-scheme CeO2/Cu2O heterojunction generates mobile reactive oxygen radicals for oxidizing target VOCs. Spectra of Kelvin probe force microscopy (KPFM) reveal that the potential difference at the CeO2/Cu2O interface grows from 9 mV in dark to 29 mV under irradiation, demonstrating a powerful force for driving the migration of photoelectrons. Therefore, under simulated sunlight exposure, 50 ppm of toluene, xylene and formaldehyde can be completely degraded in 70, 50 and 6 min by 15 cm2 CeO2/Cu2O mesh, respectively. The elimination of actual indoor VOCs confirms the practicability of the self-supporting CeO2/Cu2O catalyst, which figures out new ideas for designing efficient photocatalysts for the removal of VOCs pollutants.

引用

页数：12

共 34 条

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