Mo-LDH-GO Hybrid Catalysts for Indigo Carmine Advanced Oxidation

Autor: Octavian Dumitru Pavel, Alexandra-Elisabeta Stamate, Rodica Zăvoianu, Anca Cruceanu, Alina Tirsoaga, Ruxandra Bîrjega, Ioana Andreea Brezeștean, Alexandra Ciorîță, Daniela Cristina Culiță, Ana Paula Soares Dias
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Materials, Vol 16, Iss 8, p 3025 (2023)
Druh dokumentu: article
ISSN: 1996-1944
DOI: 10.3390/ma16083025
Popis: This paper is focused on the utilization of hybrid catalysts obtained from layered double hydroxides containing molybdate as the compensation anion (Mo-LDH) and graphene oxide (GO) in advanced oxidation using environmentally friendly H2O2 as the oxidation agent for the removal of indigo carmine dye (IC) from wastewaters at 25 °C using 1 wt.% catalyst in the reaction mixture. Five samples of Mo-LDH-GO composites containing 5, 10, 15, 20, and 25 wt% GO labeled as HTMo-xGO (where HT is the abbreviation used for Mg/Al in the brucite type layer of the LDH and x stands for the concentration of GO) have been synthesized by coprecipitation at pH 10 and characterized by XRD, SEM, Raman, and ATR-FTIR spectroscopy, determination of the acid and base sites, and textural analysis by nitrogen adsorption/desorption. The XRD analysis confirmed the layered structure of the HTMo-xGO composites and GO incorporation in all samples has been proved by Raman spectroscopy. The most efficient catalyst was found to be the catalyst that contained 20%wt. GO, which allowed the removal of IC to reach 96.6%. The results of the catalytic tests indicated a strong correlation between catalytic activity and textural properties as well as the basicity of the catalysts.
Databáze: Directory of Open Access Journals
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