Morphology-Controlled Synthesis of α-Fe2O3 Nanocrystals Impregnated on g-C3N4-SO3H with Ultrafast Charge Separation for Photoreduction of Cr (VI) Under Visible Light

被引：41
作者：
Balu, Sridharan [1 ]
Chen, Yi-Lun [1 ]
Juang, R-C [3 ]
Yang, Thomas C-K [1 ,2 ]
Juan, Joon Ching [4 ]
机构：
[1] Natl Taipei Univ Technol, Dept Chem Engn & Biotechnol, Taipei 106, Taiwan
[2] Natl Taipei Univ Technol, Precis Anal & Mat Res Ctr, Taipei 106, Taiwan
[3] Ind Technol Res Inst, Green Energy & Environm Labs, Hsinchu 300, Taiwan
[4] Univ Malaya, Nanotechnol & Catalysis Res Ctr NANOCAT, Kuala Lumpur 50603, Malaysia
来源：
ENVIRONMENTAL POLLUTION | 2020年 / 267卷
关键词：
alpha-Fe2O3; NCs; g-C3N4-SO3H; Z-Scheme; Cr (VI) photoreduction; Visible-light;
D O I：
10.1016/j.envpol.2020.115491
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Surface functionalization and shape modifications are the key strategies being utilized to overcome the limitations of semiconductors in advanced oxidation processes (AOP). Herein, the uniform alpha-Fe2O3 nanocrystals (alpha-Fe2O3-NCs) were effectively synthesized via a simple solvothermal route. Meanwhile, the sulfonic acid functionalization (SAF) and the impregnation of alpha-Fe2O3-NCs on g-C3N4 (alpha-Fe2O3 eNCs@CN-SAF) were achieved through complete solvent evaporation technique. The surface functionalization of the sulfonic acid group on g-C3N4 accelerates the faster migration of electrons to the surface owing to robust electronegativity. The incorporation of alpha-Fe2O3-NCs with CN-SAF significantly enhances the optoelectronic properties, ultrafast spatial charge separation, and rapid charge transportation. The alpha-Fe2O3-HPs@CN-SAF and alpha-Fe2O3-NPs@CN-SAF nanocomposites attained 97.41% and 93.64% of Cr (VI) photoreduction in 10 min, respectively. The photocatalytic efficiency of alpha-Fe2O3-NCs@CN-SAF nanocomposite is 2.4 and 2.1 times higher than that of pure g-C3N4 and alpha-Fe2O3, respectively. Besides, the XPS, PEC and recycling experiments confirm the excellent photo-induced charge separation via Z-scheme heterostructure and cyclic stability of alpha-Fe2O3-NCs@CN-SAF nanocomposites. (c) 2020 Elsevier Ltd. All rights reserved.
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页数：15
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