“Influence of Acid Activation of a Mixture of Illite, Koalinite, and Chlorite Clays on the Adsorption of Methyl Violet 6B Dye”, Iraqi Journal of Science, vol. 62, no. 6, pp. 1761–1778, Jul. 2021, doi: 10.24996/ijs.2021.62.6.2.