Sensitization of TiO2 nanoparticles with natural dyes extracts for photocatalytic activity under visible light

被引：50

作者：

Goulart S. ^{[1
]}

Jaramillo Nieves L.J. ^{[1
]}

Dal Bó A.G. ^{[1
]}

Bernardin A.M. ^{[1
]}

机构：

[1] Graduation Program on Materials Science and Engineering, Universidade Do Extremo Sul Catarinense, Criciúma, 88806000, Santa Catarina

来源：

Dyes and Pigments | 2020年 / 182卷

关键词：

Natural dyes; Sensitization; TiO[!sub]2[!/sub] nanoparticles; Visible light photocatalysis;

D O I：

10.1016/j.dyepig.2020.108654

中图分类号：

学科分类号：

摘要：

Titanium dioxide (TiO2) is the most used semiconductor for heterogeneous photocatalysis. However, TiO2 is activated only by ultraviolet radiation (wavelength less than 390 nm) and only 5% of the sunlight spectrum corresponds to the UV radiation, therefore restricting the efficiency of titania catalysts. Aiming to obtain more efficient photocatalytic TiO2 nanoparticles under visible light, the goal of this study is the sensitization of this semiconductor with natural dye extracts, consequently enabling the absorption of energy in the visible light spectrum. Four natural dyes were used, blackberry and hibiscus (anthocyanins group) and urucum and curcuma (carotenoids group), which were extracted by the solid-liquid extraction method. The Evonik P25 titanium dioxide was used and the sensitization of the nanoparticles was by the liquid route. Samples were characterized by UV–visible spectrophotometry, differential thermal analysis and thermal gravimetric analysis (DTA/TGA), Fourier-transform infrared spectroscopy (FTIR) and pH control. A solution of curcuma was used to determine the photocatalytic activity of the sensitized TiO2 NPs under visible light. As a result, TiO2 without sensitization degraded only 11% of the dye solution, whereas the sensitized catalysts degraded on a range of 51–73%, showing that sensitized TiO2 nanoparticles have a significant increase in the degradability of organic compounds under visible light. The sensitization of TiO2 nanoparticles with natural dye extract has a great potential to increase the photocatalytic efficiency in the visible spectrum, especially in environments without ultraviolet radiation. © 2020 Elsevier Ltd

引用

共 20 条

[1]

Dewil R., Mantzavinos D., Poulios I., Rodrigo M.A., New perspectives for advanced oxidation processes, J Environ Manag, 195, pp. 93-99, (2017)

[2]

Kumar A., Pandey G., A review on the factors affecting the photocatalytic degradation of hazardous materials, Material Sci & Eng Int J, 1, 3, pp. 106-114, (2017)

[3]

Byrne C., Subramanian G., Pillai S.C., Recent advances in photocatalysis for environmental applications, J Environ Chem Eng, 6, 3, pp. 3531-3555, (2018)

[4]

Nakata K., Fujishima A., TiO2 photocatalysis: design and applications, J Photoch Photobio C, 13, 3, pp. 169-189, (2012)

[5]

Fujishima A., Rao T.N., Tryk D.A., Titanium dioxide photocatalysis, J Photoch Photobio C, 1, 1, pp. 1-21, (2000)

[6]

Etacheri V., Di Valentin C., Schneider J., Bahnemann D., Pillai S.C., Visible-light activation of TiO2 photocatalysts: advances in theory and experiments, J Photoch Photobio C, 25, pp. 1-29, (2015)

[7]

Han F., Kambala V.S.R., Srinivasan M., Rajarathnam D., Naidu R., Tailored titanium dioxide photocatalysts for the degradation of organic dyes in wastewater treatment: a review, Appl Catal Gen, 359, 1-2, pp. 25-40, (2009)

[8]

Buddee S., Wongnawa S., Sriprang P., Sriwong C., Curcumin-sensitized TiO2 for enhanced photodegradation of dyes under visible light, J Nanoparticle Res, 16, 4, (2014)

[9]

Lim J., Bokare A.D., Choi W., Visible light sensitization of TiO2 nanoparticles by a dietary pigment, curcumin, for environmental photochemical transformations, RSC Adv, 7, 52, pp. 32488-32495, (2017)

[10]

Pelaez M., Nolan N.T., Pillai S.C., Seery M.K., Falaras P., Kontos A.G., Dunlop P.S.M., Hamilton J.W.J., Byrne J.A., O'shea K., Entezari M.E., Dionysiou D.D., A review on the visible light active titanium dioxide photocatalysts for environmental applications, Appl Catal B Environ, 125, pp. 331-349, (2012)

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