Defective domain control of TiO2 support in Pt/TiO2 for room temperature formaldehyde (HCHO) remediation

被引：47

作者：

Ahmad, Waleed ^{[1
,2
]}

Park, Eunseuk ^{[3
]}

Lee, Heehyeon ^{[1
,4
]}

Kim, Jin Young ^{[1
,2
]}

Kim, Byoung Chan ^{[1
,2
]}

Jurng, Jongsoo ^{[1
,2
,5
]}

Oh, Youngtak ^{[1
]}

机构：

[1] Korea Inst Sci & Technol KIST, Ctr Environm Hlth & Welf Res, 5 Hwarang Ro 14 Gil, Seoul 02792, South Korea

[2] Korea Univ Sci & Technol UST, KIST Sch, Div Energy & Environm Technol, 217 Gajeong Ro, Daejeon 34113, South Korea

[3] LuftKARE, Namyangju Si, Gyeonggi Do, South Korea

[4] Korea Univ, Dept Mat Sci & Engn, Seoul, South Korea

[5] Korea Univ, Green Sch, Seoul, South Korea

来源：

APPLIED SURFACE SCIENCE | 2021年 / 538卷

关键词：

Defective TiO2; Oxygen vacancy; F centers; Room temperature; ANATASE TITANIA NANOPARTICLES; PT-BASED CATALYSTS; BLACK TIO2; OXYGEN VACANCIES; CALCINATION TEMPERATURE; COMPLETE OXIDATION; METAL-CATALYSTS; VALENCE STATE; REDUCED TIO2; BAND-GAP;

D O I：

10.1016/j.apsusc.2020.147504

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：

Sustainable and effective formaldehyde (HCHO) remediation at room temperature has significant potential in next-generation indoor environment purification technology. Herein, defective anatase TiO2 was synthesized using chemical vapor condensation (CVC) and was subsequently impregnated with 0.08 wt% Pt. The resulting Pt/CVC-TiO2 catalyst was used for the room-temperature conversion of HCHO and exhibited a HCHO removal efficiency of 80% under continuous flow conditions (GHSV 100,000 cm(3) h(-1) g(cat)(-1)) with an initial concentration of 10 ppm with good stability over 600 min. The characterization results confirmed the metallic oxidation state (Pt-0), oxygen vacancies (mainly F centers), disordered domains, and strong interaction between Pt and defective TiO2 were essential for high activity. Moreover, electron paramagnetic resonance (EPR) analysis showed the consistent stability of the defective domains of CVC-TiO2, imparting catalytic stability over multiple cycles. This study highlights the synergistic relationship between oxygen vacancies in the TiO2 support and the resulting HCHO oxidation functionality.

引用

页数：9

共 80 条

[21] Preparation of a New Type of Black TiO2 under a Vacuum Atmosphere for Sunlight Photocatalysis [J].