期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 584, 期 -, 页码 114-124出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.09.107
关键词
Manganese oxide; Enzyme mimics; Visual detection; Arsenic adsorption; Catalysis
资金
- National Natural Science Foundation of China [31760486, 21565009]
- Natural Science Foundation of Guizhou Province [[2016]1403]
- Science and Technology Support Program of Guizhou Province for Social Development [[2018]2795]
- Science and Technology Program of Guizhou Province for Talent Team Building [[2018]5781, [2017]5788]
- Construction Program of Biology First-Class Discipline in Guizhou [GNYL[2017]009]
- Cooperation Project of Guizhou Province Science and Technology Department [LH[2017] 7294]
- Foundation of Key Laboratory of Wuliangye-flavor Liquor Solid-state Fermentation [2018JJ002]
- China National Light Industry
Recent studies have shown that Mn3O4 nanoparticles can be used as adsorbents for arsenic removal in aqueous solutions. Additionally, these nanoparticles exhibit enhanced catalytic activity, allowing for the development of a novel method for arsenic detection. The adsorption process changes the surface morphology of the nanoparticles, releasing Mn2+ ions to generate active sites and enhancing oxidase-mimicking catalytic activity.
Several researches have reported that Mn3O4 nanoparticles (NPs) could be used as adsorbent to remove arsenic from aqueous solution. However, we found that Mn3O4 NPs can not only adsorb arsenic, but also enhance the catalytic activity of Mn3O4 NPS, which enable us to establish a new method for the determination of arsenic. Herein, the adsorption of arsenic changes surface morphology of octahedral Mn3O4 NPs and further release Mn2+ to generate sufficient active sites, which enhances their oxidase-mimicking catalytic activity. Consequently, the solution changes to yellow and displays a characteristic absorption peak at 450 nm. This property enables us to construct a novel colorimetric chemosensor for arsenic detection. The limit of detection (LOD) of such colorimetric chemosensor for arsenic detection was determined as 1.32 mu g.L-1, which is lower than the threshold recommended by WHO. The chemosensor allows arsenic to be determined visually at the concentrations as low as 10 mu g.L-1, and displays excellent selectivity against other metal ions. Moreover, the chemosensor was successfully validated by analyzing several actual environmental and biological samples, indicating the excellent prospect of octahedral Mn3O4 NPs in the application of arsenic detection and removal. (C) 2020 Elsevier Inc. All rights reserved.
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