POTENSI DAUN KETAPANG (TERMINALIA CATAPPA) SEBAGAI BIOREDUKTOR UNTUK SINTESIS NANOPARTIKEL PERAK DALAM PENYERAPAN METILEN BIRU

Silver nanoparticles are produced by chemical method, but this method can have a negative impact on the environment due to the use of toxic substances. So, green synthesis is more desirable for producing silver nanoparticles that has the minimum envioronmental hazard. Biosynthesis of silver nanoparticles was mixed using ketapang leaf extract (Terminalia Catappa) as a bioreductor to potential of methylene blue absorption. Silver nanoparticles is a good semiconduktor materials used as photocatalists to absorbing of methylene blue. The synthesis process was carried out at a temperature of 80 °C for 10 minutes. The analysis of UV-Vis spectra found that the silver nanoparticles were synthetized using comparison of exrtact and AgNO 3 solution 1:7 with maximum wavelength absorbtion which is characteristic of the formation of silver nanoparticles at a wavelength 424 nm. SEM characterization indicates that the silver nanoparticles had a morphology of nanofibers. In this study showed that higher contact time of degradation will increase the percentage of methylene blue degradation. The degradation activity of methylene blue at a concentration of 25 mg/L in an optimal time of 6 hours resulted in degradation values of 86.13%.