期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 409, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.125019
关键词
2D Co3O4@Rh NC nanozyme; Synergetic-reinforcing oxidase; Ratiometric colorimetric sensing; Urea; p-Aminophenol
资金
- National Natural Science Foundation of China [21806089, 21277103]
- Natural Science Foundation of Shandong Province [ZR2018MB038, ZR2016BQ13]
The study successfully developed 2D Co3O4@Rh NC with superior oxidase-like catalytic activity and applied it for colorimetric sensing of urea and p-Ap in environmental samples. Investigation into the different reaction mechanisms of the 2D Co3O4@Rh NC-TMB system to urea and p-Ap provides an efficient way for sensing organic pollution of p-Ap and offers an efficient potential for diagnosing urea-related diseases on clinical medical testing in the future.
To enlarge the perspective of nanozyme, 2-dimensional Co3O4 stabilizing Rh nano composite (2D Co3O4@Rh NC) was identified and developed first by one-pot surfactant-aided oxido-reduction. By virtue of the synergeticreinforcing oxidase activity between 2D Co3O4 substrate and Rh nano particles, the obtained 2D Co3O4@Rh NC could catalyze the oxidation of chromogenic substrate 3,3',5,5,'-tetramethylbenzidine (TMB) to blue oxTMB with quite a low Michaelis-Menten constant (K-m) of 0.018 mM and a quick nu(max) of 6.45 x 10(-8) M s(-1), expressing superior oxidase-like catalysis with a wide temperature range from 20 to 60 degrees C. Importantly, either bioactive urea or toxic p-aminophenol (p-Ap) could exclusively alter the existed state of oxTMB with differentiable color changes. Under the optimized conditions, 2D Co3O4 @Rh NC was successfully applied for ratiometric colorimetric sensing urea and p-Ap in environmental water, soil and urine samples with low detection limits (1.1 mu M for urea and 0.68 mu M for p-Ap) and satisfactory recoveries (96.0-105.8%). The synergetic enhanced oxidase-like activity of 2D Co3O4@Rh NC and the different reaction mechanisms of the 2D Co3O4@Rh NC-TMB system to urea and p-Ap were investigated. Not only does the work provide an efficient way for sensing organic pollution of p-Ap, it will offer an efficient potential for diagnosing urea-related diseases on clinical medical testing in future.
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