Trap-n-zap: Electrocatalytic degradation of perfluorooctanoic acid (PFOA) with UiO-66 modified boron nitride electrodes at environmentally relevant concentrations

被引：2

作者：

Yin, Sheng ^{[1
,4
]}

Lopez, Juan Francisco ^{[1
,4
]}

Sandoval-Pauker, Christian ^{[1
,4
]}

Solis, Jonathan J. Calvillo ^{[1
,4
]}

Glass, Sarah ^{[2
,4
]}

Habib, Ahsan ^{[1
]}

Lee, Wen-Yee ^{[1
]}

Wong, Michael S. ^{[2
,3
,4
]}

Alvarez, Pedro J. J. ^{[2
,3
,4
]}

Villagran, Dino ^{[1
,4
]}

机构：

[1] Univ Texas El Paso, Dept Chem & Biochem, El Paso, TX 79968 USA

[2] Rice Univ, Dept Civil & Environm Engn, Houston, TX 77005 USA

[3] Rice Univ, Dept Chem & Biomol Engn, Houston, TX 77005 USA

[4] Nanosyst Engn Res Ctr Nanotechnol Enabled Water T, Houston, TX USA

来源：

APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2024年 / 355卷

基金：

美国国家卫生研究院;

关键词：

PFOA oxidation; PFAS; Electrocatalysis; Composite catalyst; WASTE-WATER; ELECTROCHEMICAL OXIDATION; MOLECULAR-SURFACES; PERFLUOROALKYL SUBSTANCES; PERFLUORINATED COMPOUNDS; SULFONATE PFOS; EFFICIENT; REMOVAL; GEPOL; MINERALIZATION;

D O I：

10.1016/j.apcatb.2024.124136

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Poly- and per-fluoroalkyl substances (PFAS) are synthetic chemicals of increasing global concern due to their toxicity and environmental persistence. Hexagonal boron nitride (h-BN) is an electrochemically active semiconductor that generates a hydrophobic electron-hole with a high affinity for the fluorinated tail of perfluorooctanoic acid (PFOA), which enhances surface interactions in aqueous solutions. We demonstrate that h-BN electrocatalytically oxidizes PFOA to shorter chains. The degradation is enhanced by modifying the h-BN surface with an adsorbent, UiO-66 (UiO-66@BN), that facilitates proximal adsorption to catalytic sites (trap-and-zap). At the environmentally relevant concentration of 100 mu g/L, electrochemical trap-and-zap removes 99.5% of PFOA with 70% defluorination in 3 h at a pH 4.5. Computational results show that PFOA requires an overpotential of 1.87 V vs. SCE, which is close to the experimental overpotential. The electrical energy per order (EE/O) of UiO-66@BN is 6.1 kWh/m(3), indicating that it is a competitive material for PFOA electrochemical remediation.

引用

页数：10