Mesoporous Nb2O5/SiO2 material obtained by sol-gel method and applied as adsorbent of crystal violet dye

Cibele S. Umpierres, Lizie D.T. Prola, Matthew A. Adebayo, Eder C. Lima*, Glaydson S. dos Reis, Diego D.F. Kunzler, G. L. Dotto, Leliz T. Arenas, Edilson V. Benvenutti

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

55 Citations (Scopus)

Abstract

In this work, SiO2/Nb2O5(SiNb) material was prepared using sol–gel method and employed as adsorbent for removal of crystal violet dye (CV). The material was characterized using nitrogen adsorption–desorption isotherms, FTIR spectroscopy, pHpzc, and SEM-EDS. The analysis of N2isotherms revealed the presence of micro- and mesopores in the SiNb sample with specific surface area as high as 747 m2g−1. For the CV adsorption process, variations of several parameters such as of pH, temperature, contact time, and concentration of dye of the process were evaluated. The optimum initial pH of the CV dye solution was 7.0. The adsorption kinetic and equilibrium data for CV adsorption were suitably represented by the general-order and Liu models, respectively. The maximum adsorption capacity of the CV dye by SiNb was achieved at 303 K, which attained 116 mg g−1at this temperaure. Dye effluents were simulated and used to check the applicability of the SiNb material for treatment of effluents–the material showed very good efficiency for decolorization of dye effluents.

Original languageEnglish
Pages (from-to)566-578
Number of pages13
JournalEnvironmental Technology
Volume38
Issue number5
DOIs
Publication statusPublished - 4 Mar 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • adsorption process
  • crystal violet dye
  • Mesoporous SiO/NbO
  • simulated effluents
  • sol–gel method

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