Study on the Photocatalytic Activity of ZnO and Ag/ZnO Nanoparticles Synthesized via Green Chemistry using Psidium guajava L. Leaf Extract
Keywords:
Psidium guajava L. leaf extract, Ag/ZnO nanoparticles, Photocatalytic activityAbstract
This study aimed to investigate the photocatalytic activity of ZnO and Ag/ZnO nanoparticles synthesized via green chemistry using guava (Psidium guajava Linn.) leaf extract. The composition of the guava leaf extract was analyzed using Fourier Transform Infrared (FTIR) Spectroscopy, revealing the presence of hydroxyl (-OH) and carbonyl (-C=O) functional groups, indicative of phenolic compounds acting as reducing agents in the synthesis of ZnO nanoparticles. The photocatalytic activity of the synthesized ZnO and Ag/ZnO nanoparticles was evaluated through the degradation of Rhodamine B dye under UV light irradiation for 150 minutes, with absorbance measured at the dye's maximum wavelength of 554 nm. Results indicated that ZnO calcined at 400°C exhibited the lowest dye degradation efficiency at 24.36%, while increasing the calcination temperature to 900°C can be enhanced the degradation efficiency to 49.45%. This improvement correlates with FTIR spectra showing intensified Zn-O vibration bands, suggesting increased crystallinity of ZnO at higher calcination temperatures. Furthermore, Ag doping on the ZnO surface via photoreduction significantly enhanced photocatalytic performance; Ag/ZnO calcined at 400°C achieved 87.99% dye degradation, and at 900°C, the degradation efficiency reached 97.90%. These findings demonstrate the combined influence of calcination temperature and Ag doping on the surface of ZnO, leading to superior photocatalytic efficiency.
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