Electrochemical sensors based on biomimetic magnetic molecularly imprinted polymer for selective quantification of methyl green in environmental samples

被引:70
|
作者
Khan, Sabir [1 ,2 ]
Wong, Ademar [1 ,2 ]
Boldrin Zanoni, Maria Valnice [1 ,2 ]
Taboada Sotomayor, Maria Del Pilar [1 ,2 ]
机构
[1] Univ Estadual Paulista UNESP, Dept Quim Analit, Inst Quim, Araraquara, SP, Brazil
[2] Natl Inst Alternat Technol Detect Toxicol Evaluat, Araraquara, SP, Brazil
来源
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS | 2019年 / 103卷
基金
巴西圣保罗研究基金会;
关键词
Magnetic-MIP; Environmental analysis; Electrochemical sensor; Methyl green dye; AQUEOUS-SOLUTION; GRAPHENE OXIDE; DYE; ACID; MIP; PRECONCENTRATION; WASTEWATERS; ADSORPTION; REMOVAL;
D O I
10.1016/j.msec.2019.109825
中图分类号
TB3 [工程材料学]; R318.08 [生物材料学];
学科分类号
0805 ; 080501 ; 080502 ;
摘要
A new biomimetic sensor was prepared on carbon paste with magnetic molecularly imprinted polymer (mag-MIP) for sensitive and selective detection of methyl green dye. The mag-MIP was synthesized using a functional monomer that was selected before by computational simulation. A mag-NIP (magnetic non-imprinted polymer) control material was also prepared for comparative purposes. Modeling adsorption studied revealed that the dye polymer interface followed pseudo-first order kinetics and that maximum adsorption (Q(m)) of the dye on mag-MIP was 3.13 mg g(-1), while the value for mag-NIP was 1.58 mg g(-1). The selective material was used as a sensing spot in fabrication of an electrochemical sensor based on modified carbon paste. For electrochemical analysis, the best achievement of the sensor was acquire by tack together a paste with 6.7% (w/w) of mag-MIP and using square-wave adsorptive anodic stripping voltammetry (SWAdASV) in 0.1 mol L-1 phosphate buffer (pH 7.0), with an applied potential (E-appl) of 0.3 V vs. Ag vertical bar AgClsat during an adsorption time (T-ads) of 120 s. The results were obtained under optimized conditions in which sensor provided a linear concentration range of methyl green from 9.9 x 10(-8) to 1.8 x 10(-6) mol L-1, with a limit of detection (LOD) of 1.0 x 10(-8) mol L-1 and a satisfactory relative standard deviation (RSD) of 4.3% (n = 15). The proposed sensor was applying using two spiked river water samples, obtaining recoveries ranging from 93% to 103%. The proposed method exhibits excellent precision also high reliability and proved to be an alternative method for the quantification of methyl green in real samples.
引用
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页数:7
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