Bui, Van Thang, and Thi Thuy Trang Nguyen. “An Investigation of Cu2+ Adsorption by Bentonite and Acid-Activated Bentonite: Effects of Clay Amount, Initial Concentration and Adsorption Isotherm”. Dong Thap University Journal of Science, no. 14, Aug. 2015, doi:10.52714/dthu.14.8.2015.229.