Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, P.O. Box 17011, Doornfontein, 2028, South Africa.
DSI/NRF SARChI: Nanotechnology for Water, University of Johannesburg, Doornfontein, 2028, South Africa.
Sci Rep. 2021 Jan 27;11(1):2302. doi: 10.1038/s41598-021-81839-8.
A magnetic FeO@MgAl-layered double hydroxide (MLDH) nanocomposite was successfully synthesized and applied as an effective adsorbent for preconcentration of trace As(III), Cd(II), Cr(III), Co(II), Ni(II), and Pb(II) ions from complex matrices. The quantification of the analytes was achieved using the inductively coupled plasma optical emission spectrometry (ICP-OES) technique. The nanocomposite was then characterized using BET, FTIR, SEM, and EDS. Due to its high adsorption surface area, compared to traditional metal oxide-based adsorbents, MLDH nanocomposite exhibited high extraction efficiency. Several experimental parameters controlling the preconcentration of the trace metals were optimized using response surface methodology based on central composite design. Under optimum conditions, the linearity ranged from 0.1 to 500 µg L and the correlation of coefficients (R) were higher than 0.999. The limits of detection (LODs) and quantification (LOQs) were 0.11-0.22 µg L and 0.35-0.73 µg L, respectively. The intra-day (n = 10) and inter-day precisions (n = 5 working days) expressed in the form of percent relative standard deviations (%RSDs) were below 5%. The proposed method was successfully applied for the analysis of the As(III), Cd(II), Cr(III), Co(II), Ni(II), and Pb(II) ions in different environmental water samples.
一种磁性 FeO@MgAl 层状双氢氧化物（MLDH）纳米复合材料被成功合成，并作为一种有效的吸附剂，用于从复杂基质中预浓缩痕量的 As(III)、Cd(II)、Cr(III)、Co(II)、Ni(II)和 Pb(II)离子。使用电感耦合等离子体光学发射光谱（ICP-OES）技术对分析物进行定量。然后使用 BET、FTIR、SEM 和 EDS 对纳米复合材料进行了表征。与传统的基于金属氧化物的吸附剂相比，由于其高吸附表面积，MLDH 纳米复合材料表现出高的萃取效率。使用基于中心复合设计的响应面法优化了控制痕量金属预浓缩的几个实验参数。在最佳条件下，线性范围为 0.1 至 500 µg/L，相关系数（R）高于 0.999。检出限（LOD）和定量限（LOQ）分别为 0.11-0.22 µg/L 和 0.35-0.73 µg/L。日内（n=10）和日间精密度（n=5 个工作日）以相对标准偏差（%RSD）的形式表示，低于 5%。该方法成功应用于不同环境水样中 As(III)、Cd(II)、Cr(III)、Co(II)、Ni(II)和 Pb(II)离子的分析。
