TiO2 supported on Salvinia molesta biochar for heterogeneous photocatalytic degradation of Acid Orange 7 dye

被引:85
作者
Silvestri, Siara [1 ]
Goncalves, Mayara Gabriela [2 ]
da Silva Veiga, Paulo Apolinario [2 ]
da Silva Matos, Tassya Thaiza [2 ]
Peralta-Zamora, Patricio [2 ]
Mangrich, Antonio Salvio [2 ]
机构
[1] Univ Fed Santa Maria, BR-97105900 Santa Maria, RS, Brazil
[2] Univ Fed Parana, Dept Chem, BR-81531980 Curitiba, PR, Brazil
来源
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2019年 / 7卷 / 01期
关键词
Salvinia molesta; Acid Orange 7; Biochar; Photocatalysis; Degradation; WASTE-WATER; ACTIVATED CARBON; FREE-RADICALS; AZO-DYE; PYROLYSIS; REMOVAL; ADSORPTION; SOLAR; PHOTOCHEMISTRY; DECOLORIZATION;
D O I
10.1016/j.jece.2019.102879
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Composites were prepared using Salvinia molesta biochar as a carbonaceous anchor for TiO2, employing two synthesis routes: sol-gel and mechanical mixing. TTiP and TiOSO4 were tested as TiO2 precursors. The composites were characterized using IR spectra, X-ray diffractograms, band gap energies, g Factor of EPR, surface areas, pore sizes and volumes, and scanning electron micrographs of the surfaces. For both synthesis routes, the composites prepared from TTiP showed higher crystallinity, lower band gap, and larger pore size. Due to these characteristics, the samples produced using this precursor presented the best performance in terms of both adsorption (46.5% at 60 min) and photocatalytic efficiency (57.6% at 180 min) under UV irradiation (F15 bulb, GE, 15 W, wavelength range (similar to)380 - 480 nm). The results showed that the impregnation method had a smaller influence on the photocatalytic efficiency of the composites, compared to the effect of the type of TiO2 precursor. However, impregnation by mechanical mixing produced composites that presented higher performance, compared to use of the sol-gel method. This sample presented similar ability to degrade the AO7 in up to six recycles. The (OH)-O-center dot and O-2(center dot-) radicals generated by composite were the main responsible for photodegradation of AO7 and quinone-like structures present in salvinia's biochar, being the major electron acceptors responsible for decreasing the electron/hole recombination.
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页数:8
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