Sorption Properties of a Bentonite Based Material for Removal of Uranium from Alum Shale Leachate

Abstract

A dynamic sorption experiment was performed for removal of uranium (VI or 6+) from a leachate from an alum shale landfill with a diatomite-bentonite based sorbent in a laboratory scale. Such material was grounded and treated chemically with H 3 PO 4 (phosphoric acid) and thermally for improving its porosity and resistance to water flow. A specific surface area of 209 m 2 ·g -1 was determined by the BET method. A sorption capacity of 30 µg·g -1 and 0.6 µg·g -1 was obtained at a pH of 7.5 and 4 respectively by means of Langmuir and Freundlich isotherm models. The flow rate of 3 mL·min -1 was effective for controlling the pH inside of the column. The sorption mechanism was investigated along with desorption of the element of interest for further process design considerations for a treatment unit on the landfill site.

Investigating bisulfide sorption onto bentonite through laboratory batch experiments

“…Many researchers have used Langmuir and Freundlich models to understand the adsorption of organic and inorganic substances onto clays like bentonite (Xu et al, 2008;Zhao et al, 2008;Yang et al, 2009;Dawodu et al, 2012;Shahmohammadi-Kalalagh et al, 2015;Derakhshani et al, 2016;Emilio Alvarenga et al, 2016;He et al, 2022). Still now, Langmuir and…”