Facet-Controlling Agents Free Synthesis of Hematite Crystals with High-Index Planes: Excellent Photodegradation Performance and Mechanism Insight

被引：43

作者：

Ding, Dahu ^{[1
,2
,5
]}

Huang, Yang ^{[2
]}

Zhou, Cuifeng ^{[3
]}

Liu, Zongwen ^{[3
]}

Ren, Jichang ^{[2
]}

Zhang, Ruiqin ^{[2
]}

Wang, Jianhai ^{[4
]}

Zhang, Yuanjian ^{[4
]}

Lei, Zhongfang ^{[5
]}

Zhang, Zhenya ^{[5
]}

Zhi, Chunyi ^{[2
]}

机构：

[1] Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China

[2] City Univ Hong Kong, Dept Phys & Mat Sci, Tat Chee Ave, Kowloon, Hong Kong, Peoples R China

[3] Univ Sydney, Sch Chem & Biomol Engn, Sydney, NSW 2006, Australia

[4] Southeast Univ, Sch Chem & Chem Engn, Nanjing 211189, Jiangsu, Peoples R China

[5] Univ Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, Japan

来源：

ACS APPLIED MATERIALS & INTERFACES | 2016年 / 8卷 / 01期

基金：

中国国家自然科学基金;

关键词：

hematite; facile synthesis method; high-index facets; photocatalysts; structure analysis; METHYLENE-BLUE; PHOTOCATALYTIC ACTIVITY; MESOPOROUS HEMATITE; ORGANIC-DYE; SHAPE; WATER; NANOCRYSTALS; NANOSTRUCTURES; NANOPARTICLES; SEMICONDUCTOR;

D O I：

10.1021/acsami.5b07843

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Hematite (alpha-Fe2O3) crystals with uniform size and structure are synthesized through very facile one-pot hydrothermal methods without any additive. The as-synthesized sub-micrometer-sized alpha-Fe2O3 crystals with small surface areas perform superb visible light photodegradation activities, even much better than most other alpha-Fe2O3 nanostructures with large surface areas. Profound mechanism analyses reveal that the microwave-assisted hydrothermal (Mic-H) synthesized alpha-Fe2O3 is enclosed by 12 high-index {2-15} facets. The structure and the low unoccupied molecular orbital (LUMO) of the high-index planes result in the excellent photocatalytic activity. This is the first report on the formation of {2-15} plane group of hematite, and the synthesis of the hematite particles with the {2-15} planes is very simple and no any facet-controlling agent is used. This study may pave the way to further performance enhancement and practical applications of the cheap hematite materials.

引用

页码：142 / 151

页数：10

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