A novel adsorbent Auricularia Auricular for the removal of methylene blue from aqueous solution: Isotherm and kinetics studies

In this paper, two kinds of Auricularia Auricular (edible fungi, AA) were used as the adsorbent on the adsorption of methylene blue (MB). The effects of pH, adsorbent dose, contact time, ionic strength, temperature and the characterization of adsorbents were carried out. The mathematical model fitting of the adsorption isotherm process and adsorption kinetics was investigated. The results showed that under the condition of dye concentration of 25 mg/L, adsorbent dose of 0.8 g/L, pH of 7.0, temperature of 25 degrees C and adsorption time of 60 min, AA had a pretty adsorption capacity with MB. The adsorption behavior of MB conformed to the pseudo-second-order kinetic model. The Langmuir isotherm adsorption equation could better describe the adsorption of MB by AA. The saturated adsorption capacity of MB onto AA-1 and AA-2 were 208.33 mg/g and 263.16 mg/g, respectively. The mechanism of MB removal on AA included electrostatic interaction, H-bond action, pi-pi interaction. (C) 2021 Elsevier B.V. All rights reserved.