Phytogenic Cadmium Nanoparticles with Tunable Optical Behavior for Environmental Applications

Ramalakshmi et al.,

nanoparticles | Eosin

Vol: 11; Iss. 5; May. 25 | ISSN: 2454-5422

This study explores the synthesis of cadmium nanoparticles using Emblica officinalis extract and evaluates their optical properties through UV–Visible spectroscopy. A prominent absorption peak observed at 352.88 nm, attributed to surface plasmon resonance (SPR), confirms the successful formation of cadmium nanoparticles within the nanoscale range. An additional shoulder at 431.21 nm likely arises from phytochemical interactions and surface defects. The optical data suggest the particles fall within the 10–50 nm size range, aligning with predictions from Mie theory. The plant extract functions effectively as both a reducing and stabilizing agent, facilitating the green synthesis of nanoparticles with strong optical activity suitable for environmental and catalytic applications. Furthermore, the absorption characteristics of Eosin dye were examined to assess its degradation under visible light in the presence of a photocatalyst. Initially, the dye exhibited a strong absorption band between 400–600 nm, peaking around 515–520 nm due to π→π* transitions. Over time, a consistent decline in absorbance was observed, indicating the progressive degradation of the dye’s chromophoric system. By 48 hours, the visible absorption had nearly vanished, suggesting substantial dye breakdown without the formation of detectable intermediates. These findings demonstrate the potential of the synthesized nanoparticles in photocatalytic dye degradation, supporting their use in sustainable wastewater treatment technologies.

C.Ramalakshmi, Department of Food and Nutrition, St.Eugene University, Zambia