TY - JOUR
T1 - Characterization of surfactant/hydrotalcite-like clay/glassy carbon modified electrodes
T2 - Oxidation of phenol
AU - Hernández, María
AU - Fernández, Lenys
AU - Borrás, Carlos
AU - Mostany, Jorge
AU - Carrero, Hermes
PY - 2007/8/10
Y1 - 2007/8/10
N2 - The characteristics of hydrotalcite (HT)-like clay films containing ionic and nonionic surfactants and their ability to oxidize phenol have been examined. The HT clay (Co/Al-NO3) was synthesized by coprecipitation techniques and then modified with surfactants such as sodium dodecylbenzenesulfonate (SDBS), octylphenoxypolyethoxyethanol (TX100) or cetylpyridinium bromide (CPB). X-ray diffraction analysis revealed that the interlayer basal spacing varied depending on the type of surfactant retained by the HT. The presence of SDBS and CPB expanded the HT interlayer, which in the presence of TX100 did not show an appreciable change. Phenol oxidation is favored at surfactant-HT-GC modified electrodes, after a preconcentration time, compared to phenol oxidation at HT-GC or GC electrodes. Surfactant-HT-GC modified electrodes display good stability in continuous electrochemical phenol oxidation. At pH values between 6 and 10.8, both SDBS-HT-GC and TX100-HT-GC modified electrodes seem to be promising electrodes for the detection of phenol in water; while the CPB-HT-GC modified electrode should be affected by the inorganic anions.
AB - The characteristics of hydrotalcite (HT)-like clay films containing ionic and nonionic surfactants and their ability to oxidize phenol have been examined. The HT clay (Co/Al-NO3) was synthesized by coprecipitation techniques and then modified with surfactants such as sodium dodecylbenzenesulfonate (SDBS), octylphenoxypolyethoxyethanol (TX100) or cetylpyridinium bromide (CPB). X-ray diffraction analysis revealed that the interlayer basal spacing varied depending on the type of surfactant retained by the HT. The presence of SDBS and CPB expanded the HT interlayer, which in the presence of TX100 did not show an appreciable change. Phenol oxidation is favored at surfactant-HT-GC modified electrodes, after a preconcentration time, compared to phenol oxidation at HT-GC or GC electrodes. Surfactant-HT-GC modified electrodes display good stability in continuous electrochemical phenol oxidation. At pH values between 6 and 10.8, both SDBS-HT-GC and TX100-HT-GC modified electrodes seem to be promising electrodes for the detection of phenol in water; while the CPB-HT-GC modified electrode should be affected by the inorganic anions.
KW - Clay-modified electrode
KW - Phenol oxidation
KW - Synthetic hydrotalcite-like clay
UR - http://www.scopus.com/inward/record.url?scp=34547518512&partnerID=8YFLogxK
U2 - 10.1016/j.aca.2007.06.010
DO - 10.1016/j.aca.2007.06.010
M3 - Article
AN - SCOPUS:34547518512
SN - 0003-2670
VL - 597
SP - 245
EP - 256
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - 2
ER -