Adsorption and Preconcentration of Anionic Azo Dyes on Nanomagnetite Modified with Cationic Polyelectrolytes

IF 1 4区 化学 Q4 CHEMISTRY, ANALYTICAL
K. O. Kazimirova, S. N. Shtykov
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Abstract

Magnetic nanoparticles of magnetite (MNPs) with surfaces modified by biocompatible cationic polyelectrolytes polyethyleneimine (PEI) and chitosan (CS) are synthesized by the chemical coprecipitation method. The magnetic nanoparticles were characterized by transmission electron microscopy and measurements of zeta (ζ) potential. The initial MNPs exhibit shapes close to spherical, with an average size of 10 ± 3 nm. The immobilization of a polyelectrolyte on the surface of MNPs results in the formation of aggregates with an interconnected porous network (shell) around individual particles with average sizes of 12 ± 2 nm for Fe3O4@PEI and 15 ± 2 nm for Fe3O4@CS, respectively. The effect of various experimental parameters, such as pH, extraction time, amount of adsorbent, and initial concentration of the dye, on the adsorption and desorption of food azo dyes Allura Red AC (E129) and Black Brilliant BN (E151) has been thoroughly investigated. The results demonstrate that, under optimal conditions, the recovery of these dyes from aqueous solutions reaches 96–100%, at a concentration factor of 2.7 × 103 and adsorption capacities of 56 and 94 mg/g for Fe3O4@PEI, and 46 and 69 mg/g for Fe3O4@CS for E129 and E151, respectively. A comparison of the adsorption isotherms and kinetics of the process indicates that the Langmuir model and pseudo-second-order kinetics are preferable for describing the dye adsorption process. In the acidic and neutral pH ranges, electrostatic interactions primarily drive the adsorption process, while in the alkaline region, hydrogen bonding and hydrophobic interactions also play significant roles. The proposed adsorbents can be utilized for both the adsorption and preconcentration of the dyes in chemical analysis and the treatment of wastewaters for the dye removal. The preferred material for use is polyethyleneimine-modified nanomagnetite, which enables the adsorption and preconcentration of dyes across a wide pH range of 6–9.

Abstract Image

阳离子聚电解质修饰的纳米磁铁矿对阴离子偶氮染料的吸附和预富集
采用化学共沉淀法合成了表面由生物相容性阳离子聚电解质聚乙烯亚胺(PEI)和壳聚糖(CS)修饰的磁铁矿磁性纳米颗粒(MNPs)。通过透射电子显微镜和ζ (ζ)电位测量对磁性纳米颗粒进行了表征。初始MNPs的形状接近球形,平均尺寸为10±3 nm。将聚电解质固定在MNPs表面,在单个颗粒周围形成具有相互连接的多孔网络(壳)的聚集体,其平均尺寸分别为Fe3O4@PEI(12±2 nm)和Fe3O4@CS(15±2 nm)。研究了pH、萃取时间、吸附剂用量、染料初始浓度等实验参数对食品偶氮染料Allura Red AC (E129)和Black Brilliant BN (E151)吸附和解吸的影响。结果表明,在最佳条件下,E129和E151对Fe3O4@PEI的吸附量分别为56和94 mg/g, Fe3O4@CS的吸附量分别为46和69 mg/g,对E129和E151的回收率为96 ~ 100%。吸附等温线和动力学比较表明,Langmuir模型和拟二级动力学更适合于描述染料吸附过程。在酸性和中性pH范围内,静电相互作用主要驱动吸附过程,而在碱性区域,氢键和疏水相互作用也起重要作用。所述吸附剂既可用于化学分析中染料的吸附和预富集,也可用于废水的脱色处理。首选材料是聚乙烯亚胺修饰的纳米磁铁矿,它可以在6-9的宽pH范围内吸附和预富集染料。
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来源期刊
Journal of Analytical Chemistry
Journal of Analytical Chemistry 化学-分析化学
CiteScore
2.10
自引率
9.10%
发文量
146
审稿时长
13 months
期刊介绍: The Journal of Analytical Chemistry is an international peer reviewed journal that covers theoretical and applied aspects of analytical chemistry; it informs the reader about new achievements in analytical methods, instruments and reagents. Ample space is devoted to problems arising in the analysis of vital media such as water and air. Consideration is given to the detection and determination of metal ions, anions, and various organic substances. The journal welcomes manuscripts from all countries in the English or Russian language.
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