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Magnetic nanomodified activated carbon: characterization and use for organic acids sorption in aqueous medium
Chemical Engineering Communications ( IF 2.5 ) Pub Date : 2020-07-15 , DOI: 10.1080/00986445.2020.1791832
Júlia Adorno Barbosa 1 , Geórgia Labuto 2, 3 , Elma Neide Vasconcelos Martins Carrilho 1, 4
Affiliation  

Abstract

A new approach on the sorption of aconitic and citric acids by activated carbon (AC) after nanomodification with Fe3O4 (AC-MNP) is proposed in batch procedures and as SPE (Solid Phase Extraction) cartridges for the treatment of complex samples prior to HPLC analysis. AC and AC-MNP were characterized by XRD, SEM, EDS, and FTIR. The mean crystallite size of AC-MNP and MNP were 19.16 and 10.70 nm, respectively, and FTIR bands characteristics of C = C, C–O, OH, and Fe–O were identified. Amaranth red dye sorption by AC and AC-MNP was evaluated and indicated that the surface charge of AC and AC-MNP is predominantly cationic. Experimental AC-MNP sorption capacity (SCexp) for aconitic and citric acids were 52.44 mg/g and 36.88 mg/g, respectively, and these analytes were determined by high performance liquid chromatography (HPLC). Nanomodified activated carbon (AC-MNP) cartridges were prepared to be used as SPE and compared with commercially available C18. The retention capacity of AC-MNP was 75% higher than that of C18, resulting, respectively, in 29.31 mg/g and 30.06 mg/g AC-MNP for aconitic, and 7.81 mg/g and 8.44 mg/g C18 for citric acids. Among the isotherms models used, Freundlich and Langmuir were better adjusted to aconitic and citric acid, respectively. The AC-MNP sorbent seems to be an efficient low-cost alternative to the commercially C18 cartridges most commonly used for sample pretreatment prior to organic acid determination in complex samples analysis by HPLC.



中文翻译:

磁性纳米改性活性炭:表征和用于在水介质中吸附有机酸

摘要

提出了一种使用 Fe 3 O 4 (AC-MNP ) 进行纳米改性后活性炭 (AC) 吸附乌头酸和柠檬酸的新方法,该方法以分批程序和 SPE(固相萃取)小柱的形式用于处理复杂样品。进行 HPLC 分析。AC和AC-MNP通过XRD、SEM、EDS和FTIR表征。AC-MNP 和 MNP 的平均晶粒尺寸分别为 19.16 和 10.70 nm,并且确定了 C = C、C-O、OH 和 Fe-O 的 FTIR 波段特征。评估了 AC 和 AC-MNP 对苋菜红染料的吸附,表明 AC 和 AC-MNP 的表面电荷主要是阳离子。实验 AC-MNP 吸附能力 ( SC exp) 的乌头酸和柠檬酸分别为 52.44 mg/g 和 36.88 mg/g,这些分析物通过高效液相色谱 (HPLC) 测定。制备纳米改性活性炭 (AC-MNP) 小柱以用作 SPE,并与市售的 C18 进行比较。AC-MNP 的保留能力比 C18 高 75%,分别导致乌头酸的 AC-MNP 为 29.31 mg/g 和 30.06 mg/g,柠檬酸的 C18 分别为 7.81 mg/g 和 8.44 mg/g . 在使用的等温线模型中,Freundlich 和 Langmuir 分别更好地调整为乌头酸和柠檬酸。AC-MNP 吸附剂似乎是商业 C18 小柱的一种高效低成本替代品,最常用于 HPLC 复杂样品分析中有机酸测定之前的样品预处理。

更新日期:2020-07-15
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