Hafez ME, Mai Thi T-T, Mai V-T, Do T-T, Dang Thi T-H, Pham P-U, Vu Thi H-Y, Le Q-M, Nguyen T-D. Stepwise grafting polyethyleneimine onto silica surface for Cu(II) removal. HPU2. Nat. Sci. Tech [Internet]. 2024 Dec. 30 [cited 2025 Jan. 7];3(3):20-6. Available from: http://sj.hpu2.edu.vn/index.php/journal/article/view/259