Colorimetric determination of mercury ion by enzyme-like property of iron oxide-carbon dots nanocomposite

Subject Areas : Determination of Species

Mohammad Reza Hafezi ¹ , Fatemeh Honarasa ²

1 - Department of Chemistry, Shiraz Branch, Islamic Azad University, Shiraz, Iran
2 - Department of Chemistry, Shiraz Branch, Islamic Azad University, Shiraz, Iran

Received: 2023-07-01 Accepted : 2023-07-04 Published : 2023-05-22

Keywords: Mercury (II) cation, Nanozyme, Cysteine, Iron oxide/carbon dots nanocomposite,

Abstract :

Mercury(II) cation has many risks for the environment and humans. Therefore, detection of mercury(II) cation is of particular importance. In this work, peroxidase-like activity of iron oxide/carbon dots nanocomposite was used for colorimetric determination of mercury(II) cation. To do this, first, iron oxide/carbon dots nanocomposite was prepared, and then the nanocomposite was characterized by Fourier transform infrared spectroscopy and transmission electron microscopy. Next, a sensor for determination of mercury(II) was designed by considering the peroxidase-like activity of the nanocomposite that can accelerate the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) to the cation radical of TMB* in the presence of H2O2. By using the above method, the dynamic range and detection limit for mercury(II) cation were obtained as 3.4×10-8 to 4.3×10-4 and 3.4×10-8 M, respectively. Also, this method shows good reproducibility for determination of mercury(II).

References:

1. D. Amico, A. Tassone, N. Pirrone, F. Sprovieri, and A. Naccarato, J. Hazard. Mater. 433, (2022).
2. J. Sardans, F. Montes, and J. Peñuelas, Spectrochim. Acta Part B At. Spectrosc. 65, 97 (2010).
3. X. Gao, C. Du, Z. Zhuang, and W. Chen, J. Mater. Chem. C 4, 6927 (2016).
4. Z. Yan, M. F. Yuen, L. Hu, P. Sun, and C. S. Lee, RSC Adv. 4, 48373 (2014).
5. L. Feng, L. Zhang, Y. Gong, Z. Du, X. Chen, X. Qi, X. Zhang, G. Mao, and H. Wang, Sensors Actuators B Chem. 361, (2022).
6. Z. Mohammadpour, A. Safavi, and M. Shamsipur, Chem. Eng. J. 255, 1 (2014).
7. H. Ding, B. Hu, B. Zhang, H. Zhang, X. Yan, G. Nie, and M. Liang, Nano Res. 14, 570 (2021).
8. F. Honarasa, R. Mokhtare, A. Mokhtare, and S. Yousefinejad, Process Biochem. 111, 256 (2021).
9. F. Honarasa, F. Peyravi, and H. Amirian, J. Iran. Chem. Soc. 17, 507 (2020).
10. F. Honarasa, S. Keshtkar, N. Eskandari, and M. Eghbal, Chem. Pap. 75, 2371 (2021).
11. F. Honarasa, F. H. Kamshoori, S. Fathi, and Z. Motamedifar, Microchim. Acta 186, 234 (2019).
12. S. Sadravi and F. Honarasa, J. Chem. Sci. 131, 58 (2019).
13. J. Salmiani and F. Honarasa, Nanoscale 5, 85 (2018).
14. S. Yousefinejad, H. Rasti, M. Hajebi, M. Kowsari, S. Sadravi, and F. Honarasa, Sensors Actuators B Chem. 247, 691 (2017).