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Article

Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride

CINTECX, Universidade de Vigo, Chemical Engineering Department Campus As Lagoas-Marcosende, University of Vigo, 36310 Vigo, Spain
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Author to whom correspondence should be addressed.
Catalysts 2020, 10(9), 950; https://doi.org/10.3390/catal10090950
Received: 1 July 2020 / Revised: 4 August 2020 / Accepted: 17 August 2020 / Published: 20 August 2020
(This article belongs to the Special Issue Regeneration of Adsorbent by Catalytic Process)
This research proposes the application of iron-loaded sepiolite (S-Fe) as a catalytic adsorbent for the unreported 1-butylpyridinium chloride ([bpy] Cl) treatment in an aqueous medium. Initially, sepiolite was selected as an inexpensive and efficacious adsorbent for [bpy] Cl elimination. After that, sepiolite was loaded with iron for the subsequent electro-Fenton (EF) regeneration treatment. Once kinetic and isotherm studies were performed, providing respectively almost instantaneous adsorption (20 min) and an uptake of 22.85 mg/g, [bpy] Cl adsorption onto S-Fe was studied in continuous mode. The obtained breakthrough curve was analyzed using three standard breakthrough models, being Yoon–Nelson and Thomas the most suitable adjustments. Afterwards, S-Fe regeneration by the EF process was conducted using this iron-loaded silicate material as a heterogeneous catalyst. Under optimized operational conditions (current intensity 300 mA and Na2SO4 0.3 M), complete adsorbent regeneration was achieved in 10 h. The total mineralization of [bpy] Cl was reached within 24 h and among seven carboxylic acids detected, oxalic and acetic acids seem to be the primary carboxylic acids produced by [bpy] Cl degradation. Finally, S-Fe was efficiently used in four consecutive adsorption–regeneration cycles without a noticeable reduction in its adsorption capacity, opening a path for future uses. View Full-Text
Keywords: adsorption; electro-Fenton; ionic liquid; regeneration; fixed-bed column adsorption; electro-Fenton; ionic liquid; regeneration; fixed-bed column
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MDPI and ACS Style

Ouiriemmi, I.; Díez, A.M.; Pazos, M.; Sanromán, M.Á. Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride. Catalysts 2020, 10, 950. https://doi.org/10.3390/catal10090950

AMA Style

Ouiriemmi I, Díez AM, Pazos M, Sanromán MÁ. Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride. Catalysts. 2020; 10(9):950. https://doi.org/10.3390/catal10090950

Chicago/Turabian Style

Ouiriemmi, Imen, Aida M. Díez, Marta Pazos, and María Ángeles Sanromán. 2020. "Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride" Catalysts 10, no. 9: 950. https://doi.org/10.3390/catal10090950

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