Synthesis of Silver Nanoparticles Using Marigold (Tagetes erecta) Flower Extract for Photodegradation of Methylene Blue Dye

Abstract

The utilization of methylene blue dye in the textile industry can have a significant environmental impact due to its high toxicity. To address this issue, a study was conducted on the photodegradation of methylene blue dye using silver nanoparticles (AgNP) synthesized with marigold (Tagetes erecta) flower extract as a bioreducer. This article reports on the synthesis of AgNP and its application in the photodegradation of methylene blue dye. The synthesis of AgNP involved the reduction of AgNO₃ with marigold flower extract. Different ratios of marigold flower extract to AgNO₃ solution (0.01 M) were used: 1:9, 2:8, 3:7, 4:6, and 5:5. The formation of AgNP was monitored at various time intervals using UV-Vis spectroscopy. The best AgNP sample was measured using a Particle Size Analyzer (PSA). The research results indicated that the optimal conditions were achieved at a marigold extract to AgNO₃ ratio of 2:8, with the UV-Vis spectrum showing a peak at a wavelength of 411 nm. The optimum conditions for photodegradation were as follows: AgNP volume of 15 mL, irradiation for 30 minutes, and pH 4. Under these conditions, photodegradation of methylene blue dye achieved a reduction of up to 72.46% from the initial concentration of 100 ppm.