新型螯合纤维的绿色化学合成及其从水溶液中回收金的机理。
Green chemical synthesis of new chelating fiber and its mechanism for recovery gold from aqueous solution.
机构信息
Department of Applied Chemistry, Zhejiang Gongshang University, No.149 Jiaogong Road, Hangzhou, 310012, PR China.
School of Foreign Languages, Zhejiang Gongshang University, Hangzhou 310012, China.
出版信息
J Hazard Mater. 2019 Oct 15;378:120674. doi: 10.1016/j.jhazmat.2019.05.067. Epub 2019 May 27.
A novel environmentally-friendly polyacrylonitrile-2-amino-2-thiazoline chelating fiber (PANF-ATL) with good adsorption performance and thermal stability was synthesized in one step by nucleophilic addition reaction using water as a solvent. The optimum synthesis conditions for the chelating fibers are determined by controlling the synthesis temperature and the molar ratio of the reagents. The sulfur content and functional group capacity of the finally synthesized PANF-ATL were 3.82% and 1.19 mmol/g, respectively. PANF-ATL was characterized by elemental analysis, FTIR, TGA, SEM and XPS. Meanwhile, the adsorption characteristics and mechanism of PANF-ATL were evaluated. The Langmuir model and the pseudo-second-order model well described the adsorption of Au(Ⅲ) by PANF-ATL. The adsorption capacity of PANF-ATL obtained from Langmuir isotherm model towards Au(Ⅲ) was 130.58 mg/g (298 K). In addition, Au(Ⅲ) adsorbed on the fibers was completely eluted using a mixed solution of 4 mol/L HCl and 12% thiourea. It still has good adsorption performance after 5 adsorption-desorption cycles. Overall, PANF-ATL is a cost-effective adsorbent that can effectively adsorb Au(Ⅲ) in aqueous solution.
一种新型环保的丙烯腈-2-氨基-2-噻唑啉螯合纤维（PANF-ATL）具有良好的吸附性能和热稳定性，通过亲核加成反应一步合成，以水为溶剂。通过控制合成温度和试剂的摩尔比，确定了螯合纤维的最佳合成条件。最终合成的 PANF-ATL 的硫含量和官能团容量分别为 3.82%和 1.19mmol/g。通过元素分析、FTIR、TGA、SEM 和 XPS 对 PANF-ATL 进行了表征。同时，评价了 PANF-ATL 的吸附特性和机理。Langmuir 模型和准二级模型很好地描述了 PANF-ATL 对 Au(Ⅲ)的吸附。从 Langmuir 等温模型获得的 PANF-ATL 对 Au(Ⅲ)的吸附容量为 130.58mg/g（298K）。此外，用 4mol/L HCl 和 12%硫脲的混合溶液可以完全洗脱纤维上吸附的 Au(Ⅲ)。经过 5 次吸附-解吸循环后，它仍然具有良好的吸附性能。总的来说，PANF-ATL 是一种经济有效的吸附剂，可以有效地吸附水溶液中的 Au(Ⅲ)。
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