In-situ synthesis of Z-Scheme MIL-100(Fe)/α-Fe2O3 heterojunction for enhanced adsorption and Visible-light photocatalytic oxidation of O-xylene

被引：61

作者：

Chen, Lu ^{[1
,2
]}

Wang, Xiao ^{[1
]}

Rao, Zepeng ^{[1
]}

Tang, Zixia ^{[1
]}

Wang, Yan ^{[1
]}

Shi, Gansheng ^{[1
]}

Lu, Guanhong ^{[1
]}

Xie, Xiaofeng ^{[1
]}

Chen, Deliang ^{[2
,3
]}

Sun, Jing ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, 585 Heshuo Rd, Shanghai 201899, Peoples R China

[2] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China

[3] Dongguan Univ Technol, Sch Mat Sci & Engn, Dongguan 523808, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2021年 / 416卷

基金：

中国国家自然科学基金;

关键词：

In-situ synthesis; Z-Scheme; MIL-100(Fe); -Fe < sub > 2 <; sub > O < sub > 3 <; sub >; Photocatalytic oxidation; VOCs; METAL-ORGANIC FRAMEWORK; GASEOUS ACETALDEHYDE; CATALYTIC-OXIDATION; MIL-100(FE); TIO2; PHOTODEGRADATION; DEGRADATION; WATER; GAS; PERFORMANCES;

D O I：

10.1016/j.cej.2021.129112

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Though exhibiting excellent performance in the adsorption of organic gas pollutants, the application of MOFs is still limited in the photocatalytic oxidation (PCO) of volatile organic compounds (VOCs) due to the short lifetime of photogenerated electron-hole pairs. MIL-100(Fe)/?-Fe2O3 photocatalysts were fabricated through a facile onestep hydrothermal method by adjusting the coordination of Fe(III) ions for the PCO of typical VOCs. The large specific surface area (763 m2 g-1), uniformly distributed active sites and suitable pore structure of the composites enable the effective adsorption of target o-xylene molecules. The MIL-100(Fe)/?-Fe2O3 hybrid presented a high o-xylene removal efficiency of 100% under 250 W xenon (Xe) lamp irradiation and 90% under visible light (? ? 420 nm), which is far beyond the performance of commercial TiO2 photocatalyst under the same conditions (23% under 250 W Xe lamp irradiation and 0% under visible light). The ESR results confirmed the formation of Z-scheme structure and revealed that the reversible conversion of Fe(III) and Fe(II) under light irradiation plays a key role in the oxidation of o-xylene and the effective generation of reactive radicals. The PCO mechanism of oxylene was analyzed through in-situ DRIFTS. This work not only provides a means for the synthesis and optimization of high performance photocatalysts based on MOFs for air purification, but also shed light on the PCO mechanism of o-xylene by MOFs photocatalysts.

引用

页数：12

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