ENHANCED PHOTOCATALYTIC PERFORMANCE OF CaAl LDH BY MODIFYING MUNTINGIA CALABURA EXTRACT FOR OXYTETRACYCLINE DEGRADATION
DOI:
https://doi.org/10.55766/sujst10128Keywords:
Photodegradation, Oxytetracycline, Muntingia calabura, Layered Double Hydroxide, BandgapAbstract
The persistent presence of oxytetracycline (OTC) in aquatic environments poses a serious ecological threat owing to its resistance to degradation and potential toxicity. To address these issues, this study explores an effective photocatalytic strategy utilizing CaAl layered double hydroxide (LDH) synthesized via a coprecipitation method. To enhance its photocatalytic performance, CaAl LDH was modified with bioactive compounds derived from a Muntingia calabura fruit extract, resulting in a CaAl LDH–MC material with improved structural stability and light absorption capability. X-ray diffraction, fourier transform infrared spectroscopy, ultraviolet diffuse reflectance spectroscopy, and scanning electron microscopy data confirmed that the incorporation of the Muntingia calabura extract significantly reduced the bandgap energy from 3.35 to 1.82 eV and yielded a more uniform particle morphology. Photodegradation performance was evaluated using OTC as a target pollutant with the highest degradation efficiency (66%) achieved under the optimal conditions: pH = 5, a catalyst mass of 30 mg, a temperature of 50°C, and an irradiation time of 120 min. The enhanced catalytic activity of CaAl LDH–MC was attributed to the improved charge separation and visible light absorption via extract modification. Compared with unmodified CaAl LDH, CaAl LDH–MC demonstrated superior photocatalytic efficiency and structural integrity, indicating its high application potential as a green and effective solution for environmental remediation.
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