School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China.
Shandong Inst Prod Qual Supervis & Inspect, Jinan, 250102, Shandong, China.
Mikrochim Acta. 2020 Jun 5;187(7):371. doi: 10.1007/s00604-020-04346-z.
Carbonaceous shell-coated γ-FeO nanoparticles (γ-FeO@CNM) were synthesized from glucose caramelization and used as a novel magnetic solid-phase extraction medium for malachite green and crystal violet in environmental water. Malachite green and crystal violet were absorbed on to γ-FeO@CNM by electrostatic and π-interactions. The morphologies, pore structures, surface functional groups, and magnetic properties of γ-FeO@CNM were characterized by TEM, FTIR, hysteresis regression, Brunauer-Emmet-Teller analysis, zeta potential, XPS, and XRD. The magnetic solid-phase extraction procedure was optimized by extraction pH, absorption time, desorption solvent, and desorption time. The absorption capacities (q values) for malachite green and crystal violet were 34.2 and 27.9 mg g, respectively. After magnetic solid-phase extraction, malachite green and crystal violet were determined by LC-MS/MS. The analytical method was validated with a linear range of 0.02-20 ng mL, enrichment factor of 25.8 and 25.4, method detection limit of 0.004 ng mL, and intra-day precisions of 2.1% and 2.6% for malachite green and crystal violet, respectively. The relative recovery was found to be 73.4-101.5% for malachite green and 83.1-102.7% for crystal violet upon the application of the magnetic solid-phase extraction method to real water samples from lake, spring, sea, fishpond, and industrial waste. Graphical abstract Caramelized-carbon-coated magnetic nanoparticles are used as novel extraction medium based on electrostatic and π-interactions. It is porous, amphiphilic, electronegative, magnetically strong, and features abundant absorption site. These characteristics stimulate mass transfer and result in a useful MSPE method in environmental analysis.
碳壳包裹的 γ-FeO 纳米粒子（γ-FeO@CNM）是由葡萄糖碳化合成的，可用作环境水样中孔雀石绿和结晶紫的新型磁性固相萃取介质。孔雀石绿和结晶紫通过静电和π 相互作用被吸附到 γ-FeO@CNM 上。γ-FeO@CNM 的形貌、孔结构、表面官能团和磁性能通过 TEM、FTIR、磁滞回线回归、Brunauer-Emmett-Teller 分析、Zeta 电位、XPS 和 XRD 进行了表征。通过优化萃取 pH 值、吸附时间、洗脱溶剂和洗脱时间来优化磁性固相萃取过程。孔雀石绿和结晶紫的吸附容量（q 值）分别为 34.2 和 27.9mg/g。经磁性固相萃取后，采用 LC-MS/MS 测定孔雀石绿和结晶紫。该分析方法的线性范围为 0.02-20ng/mL，富集因子分别为 25.8 和 25.4，方法检测限为 0.004ng/mL，日内精密度分别为 2.1%和 2.6%。将磁性固相萃取方法应用于来自湖泊、泉水、海洋、鱼塘和工业废水的实际水样时，孔雀石绿和结晶紫的相对回收率分别为 73.4-101.5%和 83.1-102.7%。
焦糖碳包覆磁性纳米粒子被用作基于静电和π 相互作用的新型萃取介质。它具有多孔性、两亲性、电负性、磁性强和丰富的吸附位点等特点。这些特性刺激了传质，从而为环境分析提供了一种有用的 MSPE 方法。
