MoS2/Bentonite prepared by a facile method for efficient removal of Cd2+ from aqueous solution

Abstract

The pollution of heavy metals in aqueous solution has been paid considerable attention in the past several decades. Many researches focused on developing new materials or methods for removing heavy metals. The two-dimensional lamellar structure of molybdenum disulfide (MoS 2 ) has attracted extensive interest and was regarded as a potential material due to it has a large number of active sites. In this paper, a novel one-step hydrothermal method was proposed to prepare the MoS 2 /Bentonite composite material. The MoS 2 composed of many nano petals grew successfully in the pores of bentonite to form flower spheres, and the addition of bentonite can effectively avoid the agglomeration phenomenon of MoS 2 prepared by the hydrothermal method. Pseudo-second-order model was applied to describe the adsorption process, revealing the adsorption dominated by chemical adsorption. The dynamic model was in accord with the Langmuir model and the maximum adsorption capacity of Cd 2+ was 89.45 mg/g. The excellent performance of MoS 2 /Bentonite made it have the tremendous application of removing heavy metal ions. • MoS 2 /Bentonite was prepared by a facile one-step hydrothermal method. • The addition of bentonite can avoid the agglomeration phenomenon of MoS 2 . • The performance of MoS 2 /Bentonite was superior to both pure MoS 2 and bentonite. • The adsorption characteristics were analyzed by kinetic model and isotherm model. • MoS 2 /Bentonite exhibited considerable adsorption capacity of Cd 2+ from water.