Huang W, Zhou D, Liu X, Zheng X. Electrochemical determination of phenol using CTAB-functionalized montmorillonite electrode.
ENVIRONMENTAL TECHNOLOGY 2009;
30:701-706. [PMID:
19705607 DOI:
10.1080/09593330902894364]
[Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Montmorillonite calcium (MMT) was modified with cetyltrimethylammonium bromide (CTAB) via replacement of its inorganic exchangeable cations. The resulting CTAB-modified MMT (CTAB/MMT) was used to modify the carbon paste electrode (CPE). The electrochemical behaviours of phenol at the unmodified CPE, MMT-modified CPE and CTAB/MMT-modified CPE were examined. It was found that the oxidation signal of phenol was remarkably improved at the CTAB/MMT-modified CPE, which was attributed to the higher accumulation efficiency of CTAB/MMT. Based on this, a sensitive and convenient electrochemical method was proposed for the determination of phenol. The effect of supporting electrolyte on the oxidation of phenol was examined, and 0.1 mol l(-1) NaOH was finally employed. In addition, the influences of mass content of CTAB/MMT and accumulation time were also investigated. The optimal mass content of CTAB/MMT is 25%, and the accumulation time is 3 min. Under the optimized conditions, the oxidation peak current of phenol is proportional to its concentration over the range from 1.0 x 10(-7) to 3.0 x 10(-5) mol l(-1), and the limit of detection is estimated to be 6.0 x 10(-8) mol l(-1). Finally, the CTAB/MMT-modified CPE was successfully applied to determine phenol in water samples.
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