Enhanced in-situ oxygen evolution and hydrogen peroxide production by a floatable ZnO-incorporated polyurethane photocatalyst for sulfamethoxazole degradation

被引：12

作者：

Jang, Seok Byum ^{[1
,2
]}

Yoon, So Yeon ^{[1
,2
]}

Wong, Kien Tiek ^{[1
,2
]}

Choong, Choe Earn ^{[1
,2
]}

Yoon, Yeomin ^{[3
,4
]}

Ha Choi, Eun ^{[2
]}

Jang, Min ^{[1
,2
]}

机构：

[1] Kwangwoon Univ, Dept Environm Engn, 20 Kwangwoon Ro, Seoul 01897, South Korea

[2] Kwangwoon Univ, Plasma Biosci Res Ctr, Dept Elect & Biol Phys, Seoul 01897, South Korea

[3] Univ South Carolina, Dept Civil & Environm Engn, 300 Main St, Columbia, SC 29208 USA

[4] Ewha Womans Univ, Dept Environm Sci & Engn, 52 Ewhayeodae gil, Seoul 03760, South Korea

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 467卷

基金：

新加坡国家研究基金会;

关键词：

Zinc oxide; Floatable photocatalyst; Polyurethane; Photo-corrosion; Photoexcited hole; FOAM; NANOSTRUCTURES; FILMS; ADSORPTION; STABILITY; REMOVAL; BLUE;

D O I：

10.1016/j.cej.2023.143470

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A highly efficient rigid floatable photocatalyst was prepared by seeding ZnO in polyurethane (PU) and subse-quent hydrothermal ZnO coating (P-ZsZc). Compared to pristine ZnO, granular P-ZsZc had an uplifted valence band (VB) and generated new covalent Zn-O-C bond between PU and ZnO, resulting in a significantly enhanced photocorrosion resistance by boosting the mobility of photoexcited holes. In addition, the VB of P-ZsZc was favorable for the in-situ oxygen evolution reaction (OER) and H2O2 production. As a result, the P-ZsZc achieved -98% removal of sulfamethoxazole (SMX) within 2 h for 5 consecutive cycles. Moreover, the SMX removal rate and Zn(II) leaching remained at -0.036 min-1 and 0.17 mg L-1, respectively, even during the fifth cycle for 10 h. Furthermore, scavenger experiments and electron spin resonance (ESR) spin trap analysis revealed that the main photogenerated reactive oxygen species (ROS) was H2O2. Floatable P-ZsZc showed constant SMX removal of -90% in continuous flow experiments (CFEs) for up to 10 h of operation. This study offers a new approach to prepare floatable rigid photocatalysts capable of in-situ oxygen and H2O2 production to degrade organic pollutants.

引用

页数：13

共 55 条

[1] Synergistic effect of pH solution and photocorrosion of ZnO particles on the photocatalytic degradation of Rhodamine B [J].