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Mo-LDH-GO Hybrid Catalysts for Indigo Carmine Advanced Oxidation
Octavian Dumitru Pavel1,2, Alexandra-Elisabeta Stamate1,2, Rodica Zăvoianu1,2
1Department of Inorganic Chemistry, Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Bd., 030018 Bucharest, Romania.
Hybrid catalysts combining layered double hydroxides with molybdate (Mo-LDH) and graphene oxide (GO) effectively remove indigo carmine dye using hydrogen peroxide. The optimal catalyst, HTMo-20GO, achieved 96.6% dye removal.
Area of Science:
- Materials Science
- Environmental Chemistry
- Catalysis
Background:
- Wastewater treatment remains a significant environmental challenge.
- Indigo carmine dye (IC) is a common pollutant in textile effluents.
- Advanced oxidation processes (AOPs) offer promising solutions for dye removal.
Purpose of the Study:
- To synthesize and characterize novel hybrid catalysts for indigo carmine dye removal.
- To investigate the efficiency of Mo-LDH-GO composites in advanced oxidation processes.
- To explore the relationship between catalyst properties and catalytic activity.
Main Methods:
- Synthesis of Mo-LDH-GO composites via coprecipitation.
- Characterization using XRD, SEM, Raman, ATR-FTIR, and BET analysis.
- Evaluation of catalytic performance in H2O2-based AOP for IC dye removal.
Main Results:
- Layered structure and GO incorporation confirmed in HTMo-xGO composites.
- The HTMo-20GO catalyst exhibited the highest efficiency, removing 96.6% of IC dye.
- Catalytic activity strongly correlated with textural properties and catalyst basicity.
Conclusions:
- Mo-LDH-GO hybrid catalysts are effective for indigo carmine dye removal.
- Optimized catalyst composition (20 wt% GO) enhances degradation efficiency.
- Catalyst's surface properties, particularly basicity, are crucial for AOP performance.
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