Abstract
AbstractIn this work, a dialdehyde starch cysteine (DASC) Schiff base is synthesized by the reaction of dialdehyde starch (DAS) and l‐cysteine, and subsequently tested to remove Hg (II) from aqueous solution using the batch method. It is also characterized by elemental analysis, Fourier transform infrared (FT‐IR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscope (SEM), Brunner–Emmet–Teller (BET) measurements, and X‐ray photoelectron spectroscopy (XPS) techniques. The results reveal that the DASC is a kind of starch‐based Schiff base containing thiol group, which holds excellent adsorption capacity for Hg (II) due to the interaction between sulfur atoms and Hg (II). At 25 °C, the equilibrium can be achieved within 2 h and the maximal adsorption capacity of DASC with the substitution degree of 1.14 can be reached at 884.6 mg g−1 at initial pH 5. A relatively high temperature is favorable for the adsorption process of Hg (II). The kinetic and isotherm data are well fitted with the linear forms of pseudo‐second order equation and Freundlich model. Additionally, the DASC shows good regenerative adsorption efficiency of 87.07% after four recycles. Owing to the advantages of economical, eco‐friendly, high adsorption capacity, and recyclability, DASC may provide valuable information for the treatment of Hg (II) contaminated water.
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