Nguyen, Khoa, Quynh Nguyen Vo My, Anh Phan Thi Kim, Phat Tan Tran, Duyen Huynh, and Oanh Le. “Coal Fly Ash-Slag and Slag-Based Geopolymer As an Absorbent for the Removal of Methylene Blue in Wastewater”. Science and Technology Development Journal 25, no. 1 (March 31, 2022): 2215-2223. Accessed March 28, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3421.