Adsorptive properties of mesoporous silica modified with Lewis base molecule and its application in the preconcentration of Cu(II), Co(II), and Cd(II) from aqueous media

Autor(es)

Ivassechen, Janaine do Rocio ^{[1, 2]} ; Jorgetto, Alexandre de Oliveira ^{[1, 2]} ; Pereira Wondracek, Marcos Henrique ^{[1, 3]} ; Peres da Silva, Adrielli Cristina ^[2] ; Zara, Luiz Fabricio ^[4] ; Pedrosa, Valber de Albuquerque ^[2] ; Rocha, Bruno Prior ^[1] ; Saeki, Margarida Juri ^[2] ; Castro, Gustavo Rocha ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, UNESP, Inst Chem, Araraquara, SP - Brazil

^[2] Sao Paulo State Univ, UNESP, Inst Biosci Botucatu, Dept Chem & Biochem, Botucatu, SP - Brazil

^[3] Fed Univ Grande Dourados UFGD, Fac Exact Sci & Technol, Dourados, MS - Brazil

^[4] Univ Brasilia, Fac Planaltina, Planaltina, Go - Brazil

• Tipo de documento: Artigo Científico
• Fonte: TURKISH JOURNAL OF CHEMISTRY; v. 42, n. 2, p. 547-561, 2018.
• Citações Web of Science: 2

Resumo

Cocondensation and postfunctionalization methods were employed to synthesize a mesoporous silica with large surface area (795.1 +/- 1.1 m(2) g(-1)) modified with 4-amino-5-hydrazino-1,2,4-triazole-3-thiol, which was successfully applied to adsorb and preconcentrate Cu(II), Co(II), and Cd(II) from aqueous media. Infrared spectroscopy of the adsorbent material demonstrated N-H stretching bonds related to primary amines existing in the ligand molecule, elemental analysis revealed the presence of 0.132 mmol g(-1) of nitrogen, scanning electron microscopy indicated globularly shaped particles with average size of 10 mu m, and the point of zero charge was found to be 7.2. Kinetic data were applied to the pseudo-second-order model, indicating that a chemisorption mechanism is probably involved in the uptake of metal ions from aqueous solutions. According to the Langmuir model, the adsorption capacities for the different ions obey the following order: Cu(II) > Co(II) > Cd(II). Through a preconcentration system, a preconcentration factor of 18-, 15-, and 20-fold was attained for Cu(II), Cd(II), and Co(II), respectively. The proposed method was applied in the determination of trace metals in natural river water (Tiete River) and the results were validated through standard reference material analysis. The results also indicated that the packed column proved to be stable over 24 adsorption/desorption cycles, demonstrating that the developed material is potentially suitable for the determination of trace-level metal ions in aqueous samples. (AU)

• Processo FAPESP: 12/21795-9 - Incorporação da molécula 4-amino-3-hidrazino-5-mercapto-1,2,4-triazole na superfície de sílica mesoporosa para aplicação na determinação de traços de Cu(II), Cd(II), Ni(II), Pb(II) e CO(II) em amostras de água do Rio Tietê
• Beneficiário: Gustavo Rocha de Castro
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/04791-8 - Síntese e aplicação de cloreto de polivinila (PVC) modificado em procedimento de extração em fase sólida de íons Cu(II), Ni(II), Cd(II) e Pb(II), de amostras aquosas
• Beneficiário: Gustavo Rocha de Castro
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/22955-2 - Síntese de híbridos de sílica-titânia e de sílica-titânia-magnetita e sua organofuncionalização e sensitização com íons Fe3+ para fotocatálise degradativa de 4-Clorofenol sob UV e luz visível
• Beneficiário: Alexandre de Oliveira Jorgetto
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 15/05224-0 - Síntese de híbridos de sílica-titânia e de sílica-titânia-magnetita e sua organofuncionalização e sensitização com íons Fe3+ para fotocatálise degradativa de 4-Clorofenol sob UV e luz visível
• Beneficiário: Alexandre de Oliveira Jorgetto
• Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado