Copper ferrite nanoparticles loaded on reduced graphene oxide nanozymes for the ultrasensitive colorimetric assay of chromium ions. Issue 35 (22nd August 2022)

• Record Type: Journal Article
• Authors: Yi, Wenwen; Zhang, Peng; Wang, Yunpeng; Li, Zhongping; Guo, Yujing; Liu, Meng; Dong, Chuan; Li, Changfeng
• Is Part Of: Analytical methods. Volume 14:Issue 35(2022)
• Page Start: 3434
• Page End: 3443
• Publication Date: 2022-08-22
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/d2ay01045c
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : A novel colorimetric assay for the heavy metal Cr 3+ was created for the first time. Abstract : Nowadays, due to the increasing threat of heavy metal ion pollution faced by the environment and living systems, the development of rapid and highly selective methods for the detection of chromium ions (Cr 3+ ) has aroused increasing interest. In this study, copper ferrite nanoparticles (CuFe2 O4 ) immobilized on reduced graphene oxide (CuFe2 O4 /rGO) were successfully fabricated by a simple co-precipitation method. The catalyst exhibits high peroxidase-like activity with 3, 3′, 5, 5′-tetramethylbenzidine (TMB) as a chromogenic matrix due to its large specific surface area, adsorption performance and abundant catalytic active sites. Based on the excellent peroxidase-like activity of CuFe2 O4 /rGO and its Cr 3+ -mediated inhibition controllability, a novel colorimetric assay for the heavy metal Cr 3+ was created for the first time. Under optimal experimental conditions, CuFe2 O4 /rGO can be used as a peroxidase-like nanozyme to achieve the excellent detection of Cr 3+ in the range of 0.1–25 μM, and the detection limit is 35 nM. The peroxidase-like CuFe2 O4 /rGO can provide a general catalytic platform for the application of biomimetic enzymatic catalytic systems and colorimetry, and a new approach has been established for the specific determination of the heavy metal Cr 3+ .