Photocatalytic Degradation of Methylene Blue (MB) over α-Fe2O3 Nanospindles Prepared by a Hydrothermal Route

被引:34
作者
Xuan Hoa Vu [1 ]
Luong Huu Phuoc [2 ]
Nguyen Dac Dien [3 ]
Thi Thu Ha Pham [4 ]
Luong Duy Thanh [5 ]
机构
[1] Thai Nguyen Univ Sci, Fac Phys & Technol, Tan Thinh Ward, Thai Nguyen City, Vietnam
[2] Hanoi Univ Sci & Technol, Sch Engn Phys, 1 Dai Co Viet Rd, Hanoi, Vietnam
[3] Vietnam Trade Union Univ, Fac Labour Protect, 169 Tay Son St, Hanoi, Vietnam
[4] Thai Nguyen Univ Sci, Fac Chem, Tan Thinh Ward, Thai Nguyen City, Vietnam
[5] Thuyloi Univ, 175 Tay Son, Hanoi, Vietnam
关键词
alpha-Fe2O3; nanospindles; photocatalytic degradation; methylene blue; hydrothermal treatment; LITHIUM ION BATTERY; GROWTH-MECHANISM; SELECTIVE SYNTHESIS; HOLLOW SPINDLES; HEMATITE; NANOPARTICLES; MICROSPHERES; FABRICATION; NANORODS;
D O I
10.1007/s11664-019-07056-2
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Well-crystalline iron oxide (alpha-Fe2O3) nanospindles have been prepared using a simple hydrothermal process at temperature of 240 degrees C for different durations (24h, 36h, 48h, and 60h). The products were characterized by x-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, energy-dispersive x-ray spectroscopy, and visible absorption measurements. Detailed characterization of their structure and composition confirmed formation of pure alpha-Fe2O3 with rhombohedral crystal structure. The photocatalytic activity of the obtained alpha-Fe2O3 for demineralization of methylene blue (MB) in aqueous solution under ultraviolet (UV) light irradiation was evaluated. Ultraviolet-visible (UV-Vis) spectroscopy indicated a decrease in the absorbance intensity and concentration of the dye. Mechanistic investigation revealed that center dot OH and center dot O radicals played a crucial role in the degradation process of methylene blue. The alpha-Fe2O3 nanospindles presented high photocatalytic activity towards MB with degradation efficiency of 78% within 6h of irradiation. These results demonstrate that alpha-Fe2O3 nanospindles are suitable for treatment of wastewater.
引用
收藏
页码:2978 / 2985
页数:8
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