Surface modified mesoporous nanocast carbon as a catalyst for aqueous sulfide oxidation and adsorption of the produced polysulfides
| Autor: | Manuel Karim Sapag, Fernanda Gomes de Mendonça, Deicy Amparo Barrera Diaz, João Paulo de Mesquita, Arthur Henrique de Castro, Rochel Montero Lago |
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| Rok vydání: | 2018 |
| Předmět: |
Sulfide
chemistry.chemical_element INGENIERÍAS Y TECNOLOGÍAS 02 engineering and technology 010402 general chemistry 01 natural sciences Catalysis SULFIDE OXIDATION AND ADSORPTION purl.org/becyt/ford/1 [https] Adsorption purl.org/becyt/ford/2.10 [https] purl.org/becyt/ford/1.4 [https] Materials Chemistry MODIFIED MESOPOROUS NANOCAST Nanotecnología chemistry.chemical_classification Aqueous solution Chemistry Otras Ciencias Químicas Surface modified Ciencias Químicas General Chemistry Nano-materiales 021001 nanoscience & nanotechnology 0104 chemical sciences purl.org/becyt/ford/2 [https] CHARACTERIZATION 0210 nano-technology Mesoporous material Carbon CIENCIAS NATURALES Y EXACTAS Nuclear chemistry |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| ISSN: | 1369-9261 1144-0546 |
| Popis: | In this work, a mesoporous nanocast carbon prepared using SBA-15 as a template was modified by surface oxidation to produce unique catalysts for sulfide oxidation/elimination from an aqueous medium. Different characterization techniques (BET, SEM, Raman, FTIR, potentiometric titration, elemental analyses, cyclic voltammetry) showed that treatment with concentrated HNO3 at 80 °C for 5, 15 and 30 min attacks the carbon structure creating different oxygen surface functionalities in concentrations varying from 0.4-1.1 mmol g-1 with a small effect on the surface area (1080-1148 m2 g-1) and pore volumes (micropore 0.17-0.20 cm3 g-1 and mesopores 0.36-0.50 cm3 g-1). These materials showed high activities for the oxidation of sulfide in an aqueous medium forming polysulfides, e.g., S2 2-, S3 2- and S4 2-, which are rapidly eliminated from the aqueous medium. These results are discussed regarding efficient sulfide oxidation at redox surface oxygen sites leading to the formation of higher polysulfides followed by adsorption of these relatively large and more hydrophobic molecules into the mesopores. Fil: Barrera Diaz, Deicy Amparo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Física Aplicada "Dr. Jorge Andrés Zgrablich". Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Instituto de Física Aplicada "Dr. Jorge Andrés Zgrablich"; Argentina Fil: Mendonça, Fernanda Gomes de. Universidade Federal de Minas Gerais; Brasil Fil: de Castro, Arthur Henrique. Universidade Federal dos Vales do Jequitinhonha e Mucuri; Brasil Fil: de Mesquita, João Paulo. Universidade Federal dos Vales do Jequitinhonha e Mucuri; Brasil Fil: Lago, Rochel Montero. Universidade Federal de Minas Gerais; Brasil Fil: Sapag, Manuel Karim. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Física Aplicada "Dr. Jorge Andrés Zgrablich". Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Instituto de Física Aplicada "Dr. Jorge Andrés Zgrablich"; Argentina |
| Databáze: | OpenAIRE |
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