Hafez, Mahmoud Elsayed, Thanh-Thuy Mai Thi, Van-Tuan Mai, Thuy-Tien Do, Thu-Huyen Dang Thi, Phuong-Uyen Pham, Hai-Yen Vu Thi, Quynh-Mai Le, and The-Duyen Nguyen. 2024. “Stepwise Grafting Polyethyleneimine onto Silica Surface for Cu(II) Removal”. HPU2 Journal of Science: Natural Sciences and Technology 3 (3):20-26. https://doi.org/10.56764/hpu2.jos.2024.3.3.20-26.