Hafez, M. E., Mai Thi, T.-T., Mai, V.-T., Do, T.-T., Dang Thi, T.-H., Pham, P.-U., Vu Thi, H.-Y., Le, Q.-M. and Nguyen, T.-D. (2024) “Stepwise grafting polyethyleneimine onto silica surface for Cu(II) removal”, HPU2 Journal of Science: Natural Sciences and Technology, 3(3), pp. 20–26. doi: 10.56764/hpu2.jos.2024.3.3.20-26.