State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China.
State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China.
Chemosphere. 2021 Dec;284:131308. doi: 10.1016/j.chemosphere.2021.131308. Epub 2021 Jun 23.
Mercury (Hg) 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 Hg 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-AMTD fiber exhibited enhanced adsorption capacity compared with other fibrous adsorbents and selective adsorption feature under the interference of other metal ions, including Pb, Cu, Cd, and Zn. 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-AMTD was elevated with the increase of temperature. Kinetic studies of PAN-AMTD fiber followed the pseudo-second-order and the adsorption isotherm of Hg 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-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.
汞（Hg）污染水与人类健康和生态系统的潜在毒性有关。许多研究一直在进行，以开发新的材料来修复水中的汞污染。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，制备了一种新型含硫醇和氨基的纤维状吸附剂。通过 FTIR、SEM 和元素分析对合成的功能纤维进行了表征。吸附实验表明，对于汞的摄取，PAN-AMTD 纤维表现出比其他纤维状吸附剂更高的吸附能力，并且在其他金属离子（包括 Pb、Cu、Cd 和 Zn）的干扰下具有选择性吸附的特点。研究了 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，随着温度的升高，PAN-AMTD 的吸附性能得到提高。PAN-AMTD 纤维的动力学研究遵循伪二级动力学，Hg 的吸附等温线很好地符合 Sips 和 Langmuir 方程，给出了 332.9mg/g 的最大吸附量。XPS 结果表明，功能纤维中硫和氮的协同配位作用与汞一起负责吸附过程中的吸附机制。此外，制备的 PAN-AMTD 纤维可以很容易地用 0.1M HCl 再生五次，而汞去除效率没有明显降低。因此，这项研究将促进用于从水中去除汞的新型功能材料的研究。
