Abstract
In this study, results are presented concerning the development of alternative materials based on titanium dioxide (TiO2) and agro-industrial waste for use in the treatment of effluent contaminated with dyes. The photocatalytic activity of a composite formed by the association of activated carbon, obtained from pit residue of mango, with modified titanium dioxide was evaluated by the degradation of crystal violet dye. From the analysis of X-rays diffratograms, it was observed that the modification introduced in the TiO2, as well as the formation of the composite with activated carbon, lead to wider peaks with lesser intensity, suggesting the formation of small particles. The composite presented the best photocatalytic performance, attributed to the significantly large specific area of this material when compared to pure TiO2, reaching 99% degradation of the organic matter after 60 minutes of reaction time. This is, therefore, a promising material for environmental photocatalysis.
Highlights
Pollution of water resources is a socio-environmental problem of global importance in modern society
All samples present wide bands between 3000 and 3500 cm-1 related to stretching frequencies of OH groups at the surface of these materials [11]
When analyzing the spectra of the samples of the thermally treated biomass and the active carbon (CB and activated carbon (AC)), the disappearance of some bands is observed, such as for example those observed at 2922 cm-1, 2845 cm-1, 1720 cm-1, and 1119 cm-1 in the biomass spectra
Summary
Pollution of water resources is a socio-environmental problem of global importance in modern society. Dyes have a high potential for contamination. It is a cationic dye that has harmful effects on life, causing irritation to the eyes and digestive tract and, in extreme cases, leading to respiratory and renal failure and carcinogenic potential. This dye can cause long-term effects in aquatic environments [1]. The contamination of residual water by dyes, many of them recalcitrant to classic treatments, results in numerous environmental problems, compromising ecosystems [2]. The presence of colored species in water bodies, even in small concentrations, may present harmful
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