Preparation and Characterization of Polyethyleneimine/Moliybdenum Disufide Composite for Hexavalent Chromium Removal from Aqueous Systems

In this experiment, polyethyleneimine (PEI) was used to modify the surface of flower-like molybdenum disulfide, and the PEI/MoS2 adsorbent was successfully synthesized and applied to remove Cr(VI) from wastewater. The physical and chemical property of PEI/MoS2 were analyzed by TEM, SEM and FTIR, etc. The affecting factors of the adsorption of Cr(VI) by PEI/MoS2 were discussed, including the effects of PEI loading, concentration of Cr(VI), pH value, etc. When the solution temperature is 25 oC, the solution pH is 2, the concentration of PEI/MoS2 composites adsorbent and Cr(VI) solution are 0.1 g/L and 50 mg/L, respectively, the adsorption amount of Cr(VI) by PEI/MoS2-10 is 120.7 mg/g. Experiments show that PEI/MoS2-10 has a strong selectivity to Cr(VI), and regeneration experiments show that PEI/MoS2 has a high reusable.