Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 255, Issue -, Pages 1927-1936Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.08.204
Keywords
Hydroquinone; NiCo2O4; Oxidase mimic; Colorimetry; Environmental detection
Funding
- National Natural Science Foundation of China [51602298, 51572249]
- Natural Science Foundation of Shandong Province [ZR2016EMB02, ZR2016FB05]
- National High Technology Research and Development Program of China [2013A2041106]
- Qingdao City Programs for Science and Technology Plan Projects [15-9-1-82-jch]
- Fundamental Research Funds for the Central University [201562011]
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The hierarchical urchin-like NiCo2O4 microspheres were successfully fabricated by facile two-step method, including template-free hydrothermal and calcination. The prepared NiCo2O4 microspheres with amounts of absorbed oxygen were found to possess oxidase-like activity. They could catalytically oxidize 3,3',5,5'-tetramethylbenzidine (TMB) without the exogenous addition of H2O2, causing typical color reaction. But hydroquinone (HQ) could induce the reduction of oxTMB and result in a conspicuous blue color fading. In this paper, a simple and rapid colorimetric method for detecting trace amount of HQwas explored in-depth. Excellent linear relationship (5-110 mu M) and a low detection limit of 2.7 mu M were achieved. Meaningfully, this method could be well applied in real environmental samples with outstanding recoveries ranging from 97.07% to 103.52%. These primary results demonstrated that the NiCo2O4 microspheres have a great potential for applications in environmental chemistry. (C) 2017 Elsevier B.V. All rights reserved.
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