文章基本信息

标题：Efeito da modificao de um xerogel de sílica por dodecilsulfato de sódio para a adsoro do corante violeta cristal em meio aquoso
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作者：Gabriel Vinicius Buzato ; Pedro Henrique de Paulo Olívio ; Adriano Lopes de Souza 等
期刊名称：Research, Society and Development
电子版ISSN：2525-3409
出版年度：2021
卷号：10
期号：17
页码：1-17
DOI：10.33448/rsd-v10i17.24470
语种：English
出版社：Grupo de Pesquisa Metodologias em Ensino e Aprendizagem em Ciências
摘要：The incorrect discharge of dyes has been one of the main causes of water pollution. Actions to reduce these impacts have been performed, and an alternative is through the adsorption of dyes on silica-based materials such as xerogels. Very few experiments, however, show the modification of silica-based xerogels using surfactants for dye adsorption applications. In this paper, we report the preparation of silica-based xerogels (SiO2) to explore the influence of the surface modification with sodium dodecyl sulfate (SDS) in the adsorption behavior of an organic dye, crystal violet (CV), from water using Ultra-Violet visible spectroscopy. The textural properties of the xerogels, SiO2 unmodified (SiO2-UN) and SiO2-SDS modified (SiO2-SDS) showed that the samples are mesoporous. The surface charges for SiO2-UN and SiO2-SDS were negative at experimental conditions as shown by pH point of zero charge (PZC) data. The adsorption capacity of SiO2-SDS for VC was superior to that of SiO2-UN and, in addition, SiO2-SDS had a higher rate constant. This behavior is probably ascribed to the presence of SDS micelles formed into the pores of wet silica xerogels, suggesting electrostatic interaction between anionic head groups from the micelles and cationic VC. The adsorption kinetics were best fitted by the pseudo-second order model. The equilibrium data were best described to the Langmuir isotherm model. The qm values of CV on SiO2-SDS reached 25,8 mg g1 and 1,59 mg g1 on SiO2-UN. These findings are important to help in the treatment of industrial wastewater.
关键词：Crystal violet;Dye;Adsorption;Silica xerogels.