Tran, Thi Xuan Mai, et al. “An Investigation on the Adsorption of Phenol Red and Mn(II) by CTAB Al-Bentonite in Water”. Dong Thap University Journal of Science, vol. 9, no. 3, June 2020, pp. 32-40, doi:10.52714/dthu.9.3.2020.789.