Prepare the citric acid-modified bentonite material to adsorb methylene blue in water

Abstract

To reduce serious water pollution by dyeing wastewater, the citric acid-modified bentonite material was prepared by directly activating the raw bentonite with citric acid. The material was characterized by X-ray diffraction and FT-IR spectrum. The adsorption process of methylene blue by the citric acid-modified bentonite was studied with the effect of the amount of material, time, concentration, and temperature. The results indicate that the adsorption capacity increases as the amount of adsorbent, concentration, time, and temperature increase. The methylene adsorption by the citric acid-modified bentonite fits the Langmuir model with the max adsorption capacity of 244.45 mg/g. The adsorption kinetic of this process is the second-order apparent kinetic model. This process is endothermic and spontaneous. Therefore, the citric acid-modified bentonite may be a potential adsorbent to remove the dye from water aqueous.