光催化
煅烧
材料科学
异质结
降级(电信)
氮化硼
钛
化学工程
紫外线
氧化钛
光电流
氧化物
氧化硼
全氟辛酸
化学
无机化学
环境化学
冶金
纳米技术
催化作用
光电子学
有机化学
工程类
电信
计算机科学
作者
Lijie Duan,Bo Wang,Kimberly N. Heck,Chelsea A. Clark,Jinshan Wei,Minghao Wang,Jordin Metz,Gang Wu,Ah‐Lim Tsai,Sujin Guo,Jacob Arredondo,Aditya Mohite,Thomas P. Senftle,Paul Westerhoff,Pedro J. J. Alvarez,Xianghua Wen,Yonghui Song,Michael S. Wong
标识
DOI:10.1016/j.cej.2022.137735
摘要
Boron nitride (BN) has the newly-found property of degrading recalcitrant polyfluoroalkyl substances (PFAS) under ultraviolet C (UV-C, 254 nm) irradiation. It is ineffective at longer wavelengths, though. In this study, we report the simple calcination of BN and UV-A active titanium oxide (TiO2) creates a BN/TiO2 composite that is more photocatalytically active than BN or TiO2 under UV-A for perfluorooctanoic acid (PFOA). Under UV-A, BN/TiO2 degraded PFOA ∼ 15 × faster than TiO2, while BN was inactive. Band diagram analysis and photocurrent response measurements indicated that BN/TiO2 is a type-II heterojunction semiconductor, facilitating charge carrier separation. Additional experiments confirmed the importance of photogenerated holes for degrading PFOA. Outdoor experimentation under natural sunlight found BN/TiO2 to degrade PFOA in deionized water and salt-containing water with a half-life of 1.7 h and 4.5 h, respectively. These identified photocatalytic properties of BN/TiO2 highlight the potential for the light-driven destruction of other PFAS.
科研通智能强力驱动
Strongly Powered by AbleSci AI