Efficiency removal of rhodamine B by MoS2/magnetic potato residues biochar: Performance and mechanism

Despite extensive research on dyes wastewater treatment with molybdenum disulfide (MoS2) and magnetic biochar (MBC), the specific removal efficiency and mechanism of Rhodamine B (RhB) by MoS2-loaded magnetic potato residue biochar remain unclear. In this study, potato residue biochar (BC) and a novel MoS2/magnetic potato residues biochar (MoS2/MBC) were prepared, and the removal capacities and mechanisms of biochars were explored through batch sorption experiments. Compared with that of BC (48.84 mg & sdot;g- 1), the maximum RhB sorption capacities of MoS2/MBC increased to 260.93 mg & sdot;g- 1. The kinetics and isothermal adsorption of RhB by MoS2/MBC were better fitted by the pseudo-second order and Langmuir models, respectively, suggesting that the RhB removal by MoS2/MBC predominantly involved chemical monolayer adsorption. The adsorption of RhB on MoS2/MBC was an entropy-driven process, and compared to BC, the two typical cations (calcium ion and magnesium ion) had a smaller impact on the RhB removal performance of MoS2/MBC. In addition, the adsorption of MBC by RhB was primarily facilitated through hydrogen bond, electrostatic adsorption, it-it superposition and surface complexation. Collectively, these findings indicate that magnetic potato residues biochar is a highly effective adsorbent for RhB, has promising potential for practical applications, and has a controllable cost.