Room-Temperature Preparation of Platinized Nonstoichiometric Tungsten Oxide via Platinum Photodeposition Followed by Chemical Reduction: Kinetic Enhancement of Photocatalytic Oxidation and Disinfection under Low-Intensity Visible-Light Irradiation

被引：3

作者：

Kim, Jaesung ^{[1
]}

Lee, Hongshin ^{[1
]}

Kim, Minjeong ^{[1
]}

Ahn, Yong-Yoon ^{[2
]}

Ko, Young-Jin ^{[3
]}

Oh, Hyung-Suk ^{[3
]}

Kang, Minseok ^{[4
]}

Chung, Myoung Won ^{[5
,6
]}

Weon, Seunghyun ^{[5
,6
]}

Cho, Min ^{[4
]}

Lee, Hangil ^{[7
]}

Lee, Jaesang ^{[1
]}

机构：

[1] Korea Univ, Sch Civil Environm & Architectural Engn, Seoul 02841, South Korea

[2] Korea Polar Res Inst KOPRI, Incheon 21990, South Korea

[3] Korea Inst Sci & Technol, Clean Energy Res Ctr, Seoul 02792, South Korea

[4] Chonbuk Natl Univ, Adv Inst Environm & Biosci, Div Biotechnol, Iksan 570752, South Korea

[5] Korea Univ, Sch Hlth & Environm Sci, Seoul 02841, South Korea

[6] Korea Univ, Dept Hlth & Safety Convergence Sci, Seoul 02841, South Korea

[7] Sookmyung Womens Univ, Dept Chem, Seoul 04310, South Korea

来源：

ACS ES&T ENGINEERING | 2023年 / 3卷 / 11期

基金：

新加坡国家研究基金会;

关键词：

photocatalysis; visible-light responsivity; platinized tungsten suboxides; oxygen vacancy; catalytic hydrogenation; OXYGEN VACANCY; HYDROXYL RADICALS; THIN-FILMS; WO3; TIO2; NANOSTRUCTURES; MECHANISMS; IMPROVE; ZNO;

D O I：

10.1021/acsestengg.3c00217

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Oxygen vacancy (OV) as the key site in promoting charge separation and visible-light harvesting in WO3 has often been created through thermal annealing. However, this study proposes the sequential combination of Pt photodeposition followed by chemical reduction using NaBH4 as a room-temperature approach to fabricate platinized oxygen vacant tungsten oxide (Pt/WO3-x). OVs (or low-valence tungsten), detected using multispectroscopic techniques, occurred by catalytic hydrogenation featuring atomic hydrogen generated via H-2 (evolved from NaBH4 hydrolysis) dissociation on surface-loaded Pt nanoparticles. The Pt phase necessity for H-2 splitting was supported based on the enhanced photocatalytic performance achieved when Pd photodeposition and hydrogen annealing were alternatively adopted as pre- and post-treatment steps, respectively. The superiority of Pt/WO3-x over stoichiometric counterparts in terms of photocatalytic activity for aqueous-phase organic oxidation was demonstrated by a comparative assessment with varied Pt contents, light intensities, and target substrates. This aligned with the improved efficiency of Pt/WO3-x for the photocatalytic decomposition of gaseous toluene and the inactivation of pathogenic microorganisms. Together with negligible performance loss and minor variation in tungsten/oxygen valences during repeated use, marked enhancement in the visible-light activity of Pt/WO3-x via OV implantation at room temperature implied the potential of the proposed two-step method to produce oxygen-defective metal oxides.

引用

页码：1770 / 1786

页数：17