Preparation of MoS2 nanoflowers with rich active sites as an efficient adsorbent for aqueous organic dye
In this study, molybdenum disulfide (MoS2) was used as an adsorbent to quickly and efficiently remove Rhodamine B (RhB) in wastewater. Rich active sites of ultrathin layered MoS2 nanoflowers were prepared via a hydrothermal method. The ultrathin layered MoS2 nanoflowers exhibited remarkable adsorption capacity to RhB dyes, which reached 365 mg/g within 20 min, which was due to the large specific BET surface, the large amount of active sites and the intensive electrostatic attraction between the negative charge of MoS2 nanoflowers and RhB cationic molecule. The high BET surface (71.7 m2/g) provided high quantity of active sites and storage centers for the RhB molecules. The adsorption behaviors were highly suitable via the pseudo-second-order adsorption model and Langmuir isotherm model. The reusability tests demonstrated the MoS2 nanoflowers could be reactivate for 6 times and the retained adsorption capacity exceeds 85%. The results show that the MoS2 structure had significant adsorption capacity and could be used as adsorbent in wastewater treatment.