“Adsorption on a fixed - bed column of Mn(II) from aqueous solutions by nano bentonite prepared from ultrasonic – assited activation”, Vietnam j. catal. adsorp., vol. 8, no. 2, pp. 23–28, Jul. 2019, Accessed: Feb. 28, 2025. [Online]. Available: https://jca.edu.vn/index.php/jca/article/view/571