SUCIYATI, S.W., JUNAIDI, J., SITUMEANG, R. and MANURUNG, P. 2024. Nano-ZnO prepared by using chaya and mango leaves extract for photocatalyst of methylene blue. Journal of Metals, Materials and Minerals. 34, 1 (Mar. 2024), 1848. DOI:https://doi.org/10.55713/jmmm.v34i1.1848.