Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 841, Issue -, Pages 142-147Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2019.04.046
Keywords
Chromium ions detection; Electroanalysis; Water quality monitoring; Screen printed electrode; Surface modification
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Funding
- Research Foundation from Hangzhou Dianzi University [KYS205617071]
- Zhejiang Province Natural Science Foundation of China [LQ18E010001]
- National Natural Science Foundation of China [U1607105]
- Scientific and Technological Funding in Qinghai Province, China [2018-GX- 101, 2018-ZJ-722, 2019-HZ-808]
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Two types of alpha-Fe2O3 nanostructures were synthesized under hydrothermal conditions in the presence of glycerol. Urchin-like alpha-Fe2O3 with limited (001) plane exposure and flower-like alpha-Fe2O3 with a high degree of (001) plane exposure were used to modify the surfaces of screen-printed electrodes (SPEs), which were then employed in electrochemical Cr(VI) detection. Linear sweep voltammetric results indicate that the high exposure of the (001) plane could result in a high current response toward Cr(VI) reduction due to the high adsorption capacity induced by doubly and triply coordinated hydroxyl groups on the surface of alpha-Fe2O3. The modified SPE had a linear response to Cr(VI) in the 5-3000 mu g/L concentration range with a detection limit of 1.17 mu g/L.
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