Mercury (Hg²⁺) contamination in water is associated with potential toxicity to human health and ecosystems. Many research studies have been ongoing to develop new materials for the remediation of Hg²⁺ pollution in water. In this study, a novel thiol- and amino-containing fibrous adsorbent was prepared by grafting 2-amino-5-mercapto-1,3,4-thiadiazol (AMTD) onto PAN fiber through a microwave-assisted method. The synthesized functional fiber was characterized by FTIR, SEM, and elemental analysis. Adsorption tests depicted that for mercury uptake, PAN_MW-AMTD fiber exhibited enhanced adsorption capacity compared with other fibrous adsorbents and selective adsorption feature under the interference of other metal ions, including Pb²⁺, Cu²⁺, Cd²⁺, and Zn²⁺. The influence of pH on the adsorption process was investigated and the effect of temperature revealed that the adsorption sorption process was endothermic and the adsorption performance of PAN_MW-AMTD was elevated with the increase of temperature. Kinetic studies of PAN_MW-AMTD fiber followed the pseudo-second-order and the adsorption isotherm of Hg²⁺ was well fitted by Sips and Langmuir equations, given the maximum adsorption amount of 332.9 mg/g. XPS results suggested that a synergetic coordination effect of sulfur and nitrogen in functional fiber with mercury took responsibility for the adsorption mechanism in the uptake process. In addition, the prepared PAN_MW-AMTD fiber could easily be regenerated with 0.1 M HCl for five times without significant reduction of mercury removal efficiency. Thus, this study will facilitate the research on novel functional material for the removal of mercury from water.

水中的汞 (Hg ²⁺ ) 污染与对人类健康和生态系统的潜在毒性有关。许多研究正在进行中，以开发用于修复水中Hg ²⁺污染的新材料。在这项研究中，通过微波辅助方法将 2-氨基-5-巯基-1,3,4-噻二唑 (AMTD) 接枝到 PAN 纤维上，制备了一种新型的含硫醇和氨基的纤维吸附剂。通过FTIR、SEM和元素分析对合成的功能纤维进行了表征。吸附试验表明，PAN _MW- AMTD纤维在吸汞方面表现出比其他纤维吸附剂更强的吸附能力和在其他金属离子（包括Pb ²⁺、Cu）的干扰下的选择性吸附特性²⁺、Cd ²⁺和Zn ²⁺。考察了pH值对吸附过程的影响，温度的影响表明吸附过程是吸热的，PAN _MW- AMTD的吸附性能随着温度的升高而升高。PAN _MW -AMTD 纤维的动力学研究遵循准二级，Hg ²⁺的吸附等温线通过Sips 和Langmuir 方程很好地拟合，最大吸附量为332.9 mg/g。XPS 结果表明，功能纤维中硫和氮与汞的协同配位作用负责吸收过程中的吸附机制。此外，制备的 PAN _MW-AMTD 纤维可以很容易地用 0.1 M HCl 再生五次，而不会显着降低除汞效率。因此，这项研究将有助于研究用于去除水中汞的新型功能材料。