Journal
MICROCHIMICA ACTA
Volume 189, Issue 1, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-021-05112-5
Keywords
4-Aminophenol determination; Transition metal nitrides; Nanozyme; Catalysis; Colorimetric detection
Categories
Funding
- National Natural Science Foundation of China [21874023]
- Special Program for Technical Support of the State Administration for Market Regulation of China [2019YJ023]
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Mo5N6 nanosheets exhibited peroxidase-like and catalase-like activities under acidic and weak basic conditions, respectively. A colorimetric method based on these activities was developed for the quantitative detection of 4-aminophenol (4-AP), which showed excellent sensitivity and accuracy.
Mo5N6 nanosheets were synthesized by a nickel-induced growth method and were found to possess peroxidase-like activity in acidic condition and catalase-like activity in weak basic condition. In acidic condition, Mo5N6 nanosheets can catalyze the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) by H2O2 to form a blue color product (TMBOX). At the co-existence of 4-aminophenol (4-AP), 4-AP can react with H2O2 and TMBOX, resulting in the decrease of TMBOX and the fading of blue color. Therefore, a facile, sensitive colorimetric method for the quantitative detection of 4-AP was developed. The linear range for 4-AP was 1.0 to 80.0 mu mol.L-1' (R-2 = 0.999), and the detection limit was 0.56 mu mol.L-1 based on 3 sigma/k. Resorcinol, aniline, humic acid, and common ions and anions in surface water did not interfere the determination of 4-AP. This colorimetric method was applied to measure the 4-AP in real water sample from Wulong River in Fujian Province of China. The relative standard deviation for the determination of 4-AP was ranged from 0.03 to 1.88%, and the recoveries from spiked samples were ranged between 99.2 and 107.6%. The determination results were consistent with those obtained by HPLC.
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