Tran Nguyen Phuong Lan*, Ly Kim Phung, Luong Huynh Vu Thanh, Nguyen Hong Nam, Tran Thi Bich Quyen and Le Phan Hung 2022. Removal of methylene blue using zeolite NaX with silica derived from rice husk ash. Version B of Vietnam Journal of Science and Technology. 64, 6 (Jun. 2022). DOI:https://doi.org/10.31276/VJST.64(6).14-18.