article · Applied Surface Science Advances
Spinel oxide photocatalysts composed of cobalt, zinc, and aluminium were synthesised from layered double hydroxide precursors through calcination at temperatures ranging between 300 and 1000 degrees Celsius. The resulting materials underwent structural, chemical, and thermal characterisation before evaluation for water remediation. Their photocatalytic performance was tested by breaking down methyl orange, an azo dye serving as a model textile pollutant, under ultraviolet illumination. Operational factors including irradiation duration, starting pH, catalyst dosage, dye concentration, and reusability were systematically assessed. The calcination temperature significantly influenced performance, revealing a synergistic effect between dye adsorption and photocatalytic breakdown. The material calcined at 400 degrees Celsius exhibited the highest efficiency, degrading 98.2 percent of the dye within 50 minutes of exposure. Furthermore, the catalyst maintained high stability across five consecutive regeneration cycles.
Textile manufacturing frequently releases persistent azo dyes into wastewater, threatening ecosystems and water supplies. Finding reusable, robust catalysts that rapidly break down these pollutants under light provides an avenue for cleaner industrial effluent treatment. Demonstrating that a material retains its activity over five cycles indicates potential for reducing operating costs and material waste in environmental remediation processes.
The research could support industrial effluent treatment systems, especially for operations discharging textile dyes. The prospective users would be wastewater management operators and environmental engineering firms. Because the findings are based entirely on laboratory-scale testing of a single model dye under controlled ultraviolet light, the technology remains at an early research stage, requiring scaled testing in real multi-pollutant effluents before practical deployment.
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In this research, Co0.5Zn0.5Al2O4 spinel oxides photocatalysts were elaborated from layered double hydroxides Co-Zn-Al/CO3 precursor by calcination at 300, 400, 500, 600, 800, and 1000 °C. XRD, FTIR, TGA/DTA, and SEM/EDX analysis were used for characterized of prepared photocatalysts. The photocatalytic efficiency of the prepared materials was tested by photodegradation of methyl orange (MO) azo dye as a model of textile contaminants under UV illumination. The effect of various operational factors such as irradiation time, initial pH, catalyst dose, methyl orange concentration and reuse were investigated. The enhancement of the photodegradation was strongly dependent on the calcination temperature. A synergic effect between the adsorption and photodegradation was observed. After 50 min of irradiation, the catalyst calcined at 400 °C showed the highest efficiency (98.2%). After regeneration (up to five cycles), the photocatalyst showed high stability.
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DOI: 10.1016/j.apsadv.2023.100381
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