Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 131, Issue -, Pages 666-675Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2019.03.095
Keywords
Copper nanoparticles; Chitosan; Nitroaniline; Sensor; Reduction
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In this study, we proficiently designed metal nanoparticles embedded in chitosan biopolymeric matrices, which have the ability to be employed simultaneously for the recognition and complete reduction of 4-nitroaniline. Copper nanoparticles embedded chitosan (CuNPs-CH) were coated on glassy carbon electrode to design an efficient electrochemical sensor for 4-nitroaniline. The sensing ability of CuNPs-CH modified electrode toward 4-nitroaniline was assessed by cyclic voltammetry, amperometry and chronoamperometry at working potential of -0.76 V and pH 7.0, while the complete reduction of 4-nitroaniline was analyzed by UV-visible spectrophotometer. The sensing features of CuNPs-CH modified electrode include a sensitivity of -8.166 mu A mM(-1) cm(-2), and detection limit of 037 mu M. The catalytic ability of CuNPs-CH for 4-nitroaniline reduction reaction was investigated. The results displayed that 4-nitroaniline completely transformed to diaminobenzene in short contact time with a rate constant of 7.51 x 10(-3) s(-1). The reduction aptitude of CuNPs-CH was also examined toward 4-nitrophenol and rhodamine B; however, the designed system was more efficient toward 4-nitroaniline. The developed approach offered a new methodology for simultaneous detection and reduction of 4-nitroaniline simply for environmental safety purposes. (C) 2019 Published by Elsevier B.V.
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