Biosynthesised ZnO nano-photo-catalyst for degradation of Congo Red dye for water remediation and study of their antibacterial and antifungal activities.

Author(s)	Dr. Mrinalini Parmar, Mr. Brij bhushan Santosh Pandey, Dr. Mallika Sanyal
Country	India
Abstract	ZnO Nanoparticles synthesised using Ricinus cummunis leaves as reducing and capping agent serves as a good photocatalyst that is utilised to degrade Congo Red Dye which is a common anionic azo dye. The ZnO NPs were confirmed using UV-Vis, IR, XRD and EDX spectroscopy. The size of the nanosized ZnO particles is around 20nm as calculated from images of FE -SEM and HR- TEM. The degradation of Congo Red dye as a function of change in catalyst load and change in dye concentration was studied. The ZnO NPs catalysed degradation was maximum (88%) for 40mg catalyst in 20ppm dye concentration. These particles also exhibit good antibacterial and anti-fungal activities. Antibacterial activities against E.coli and S.aurious were excellent whereas antifungal activities against Candida albicans was better than Aspergillus fumigatus. The IC 50 value for Candida albicans was 132.
Keywords	Photocatalyst, Congo Red Dye Degradation, Antifungal, Antibacterial
Field	Chemistry
Published In	Volume 8, Issue 2, March-April 2026
Published On	2026-03-23
DOI	https://doi.org/10.36948/ijfmr.2026.v08i02.69803

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