Modification of montmorillonite with cationic surfactant and application in electrochemical determination of 4-chlorophenol.
Herein, montmorillonite calcium was exchanged with a cationic surfactant: cetyltrimethylammonium bromide (CTAB). The resulting CTAB-modified montmorillonite calcium (CTAB-MMT) shows higher accumulation efficiency to 4-chlorophenol compared with the unmodified MMT. At the CTAB-MMT-modified carbon paste electrode, the oxidation peak current of 4-chlorophenol remarkably increases. Based on this, a novel, sensitive and convenient electrochemical method was developed for the determination of 4-chlorophenol. The oxidation peak current of 4-chlorophenol is proportional to its concentration over the range from 5.0 x 10(-8) to 1.0 x 10(-5) mol L(-1). The limit of detection is evaluated to be 2.0 x 10(-8) mol L(-1) for 2 min accumulation. Finally this newly proposed method was successfully applied to determine 4-chlorophenol in water samples.
Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province, Hubei Institute for Nationalities, Enshi 445000, PR China.
Hongyu
H
Yang
Xiaojiang
X
Zheng
Wensheng
W
Huang
Kangbing
K
Wu
D001546:Bentonite / Q000737:chemistry*; D002412:Cations; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D002733:Chlorophenols / Q000032:analysis*; D004563:Electrochemistry / Q000379:methods*; D010084:Oxidation-Reduction; D015203:Reproducibility of Results; D013501:Surface-Active Agents / Q000737:chemistry*
D002412:Cations; D002593:Cetrimonium Compounds; D002733:Chlorophenols; D013501:Surface-Active Agents; D001546:Bentonite; C029107:4-chlorophenol; D000077286:Cetrimonium