Bentonite functionalized with amine groups by the sol-gel route as efficient adsorbent of rhodamine-B and nickel (II)

Author(s)

Pinos, Jessica Yasmin de Morais ; de Melo, Leticia Barbosa ; de Souza, Suelen Delfino ; Marcal, Liziane ; de Faria, Emerson Henrique

• Document type: Journal article
• Source: APPLIED CLAY SCIENCE; v. 223, p. 12-pg., 2022-06-15.

Abstract

Environmental issues caused by population growth and increased industrial activity have become the object of criticism and discussion. This study evaluates how efficiently surfactant-modified bentonite bearing amine groups removes the metal nickel(II) and the dye rhodamine-B (RB) from wastewaters. First, hybrid inorganic organic materials were obtained by intercalation of a bentonite (Bent) with the surfactant cetyltrimethylammonium bromide (CTA), followed by functionalization with [N-3 (trimethoxysilyl)propyl] ethylenediamine (DAPTMS) by the sol-gel process. Then, the resulting materials were characterized by X-ray diffraction, infrared absorption spectroscopy, thermal analysis, specific surface area analysis, Small-Angle X-ray Scattering, and pHPZC and tested as adsorbents of Ni(II) or RB by the batch method. X-ray diffraction confirmed that the Bent interlayer space expanded after intercalation with CTA -the basal space varied from 1.3 nm in Bent to 1.8 nm in Bent-CTA and to 1.6 nm in Bent-CTA-DAPTMS. Infrared absorption spectroscopy attested that Bent-CTA-DAPTMS contained organosilane and surfactant: the spectra displayed bands at 2925, 2853, 1470 cm(-1), assigned to the CH2, CH3, and NH2 groups, respectively. The batch adsorption equilibrium experiments revealed that Bent and Bent-CTA-DAPTMS had higher adsorptive capacity for Ni(II) (q(t) = 65.77 mg g(-1)) and RB (qt = 0.98 mg g(-1)), respectively. The use of nonlinear equation models revealed that Ni(II) or RB adsorption onto the investigated materials followed pseudo-second-order kinetics, thereby confirming the high affinity between adsorbent and contaminants. (AU)

• FAPESP's process: 17/15482-1 - Novel strategies synthesis to reuse Tanner industry by-products to obtain high-value functional porous materials
• Grantee: Emerson Henrique de Faria
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/11673-3 - Thin films obtained by spin and dip-coating using sol-gel methodology
• Grantee: Eduardo José Nassar
• Support Opportunities: Regular Research Grants
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• Grantee: Katia Jorge Ciuffi Pires
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/03335-8 - Ironporphyrins as catalysts in oxidation reaction of cyclohexane and Baeyer-Villeger: heterogeneous systems
• Grantee: Katia Jorge Ciuffi Pires
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/19523-3 - Functional Biohybrid materials based on layered and/or fibrous natural clays with multifaceted applications
• Grantee: Emerson Henrique de Faria
• Support Opportunities: Regular Research Grants
• FAPESP's process: 05/00720-7 - Synthesis, characterization and catalytic activity of biomimetic and non-biomimetic systems, in hydrocarbon oxidation, using hydrogen peroxide as oxidant
• Grantee: Katia Jorge Ciuffi Pires
• Support Opportunities: Regular Research Grants