In 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.

中文翻译：

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有效去除环境污染物中汞的淀粉基吸附剂的制备和表征（II）

在这项工作中，二醛淀粉半胱氨酸（DASC）的席夫碱是由二醛淀粉（DAS）和反应合成的升-半胱氨酸，随后使用分批方法进行测试以从水溶液中去除Hg（II）。它还具有元素分析，傅立叶变换红外（FT-IR）光谱，热重分析（TGA），扫描电子显微镜（SEM），Brunner–Emmet–Teller（BET）测量和X射线光电子能谱（XPS）的特点技术。结果表明，DASC是一种含硫醇基的淀粉基席夫碱，由于硫原子与Hg（II）之间的相互作用，对Hg（II）具有极好的吸附能力。在25°C下，可以在2 h内达到平衡，并且在884.6 mg g ^-1下可以达到DASC的最大吸附容量，取代度为1.14在初始pH为5时，相对较高的温度有利于Hg（II）的吸附过程。动力学和等温线数据非常适合伪二阶方程和Freundlich模型的线性形式。此外，DASC在四个循环后显示出87.07％的良好再生吸附效率。由于具有经济，环保，高吸附能力和可回收利用的优势，DASC可能为处理受汞（II）污染的水提供有价值的信息。