Estudo espectro eletroquímico de sistemas estruturados argila-corante
Article Sidebar
Main Article Content
Abstract
metileno (MM-AM)/AM solução foi investigado empregando-se a técnica de voltametria cíclica e de
transiente, I x t (corrente versus tempo) sobre eletrodo de vidro ITO modificado pela deposição mecânica
de filmes do compósito MM-AM. Os filmes foram preparados empregando três procedimentos: 1- na
ausência de CTACl (surfactante, cloreto de cetiltrimetilamônio); 2- com incorporação do CTACl à região
interlamelar; e 3- na presença do CTACl, porém, não incorporado à região interlamelar. A técnica
espectrofotométrica foi empregada para a caracterização e para o estudo eletrocrômico dos filmes formados.
Os resultados experimentais permitiram observar que: i- os filmes preparados com a incorporação prévia
do AM a região interlamelar fornecem uma resposta eletroquímica mais eficiente com o aparecimento de
um par de picos bem definido; ii- a adição do CTACl, de forma geral permite a obtenção de filmes
mecanicamente mais estáveis; iii- com a inclusão prévia do CTACl na região interlamelar não ocorre o
aparecimento da forma protonada do AM (AMH + ); iv- na ausência da forma protonada o compósito não
apresenta comportamento eletrocrômico.
Metrics
Article Details
This work is licensed under a Creative Commons Attribution 4.0 International License.
The corresponding author transfers the copyright of the submitted manuscript and all its versions to Eclet. Quim., after having the consent of all authors, which ceases if the manuscript is rejected or withdrawn during the review process.
When a published manuscript in EQJ is also published in other journal, it will be immediately withdrawn from EQ and the authors informed of the Editor decision.
Self-archive to institutional, thematic repositories or personal webpage is permitted just after publication. The articles published by Eclet. Quim. are licensed under the Creative Commons Attribution 4.0 International License.
References
BERGMANN, K.; OKONSKI, C. T. A spectroscopic
study of methylene blue monomer, dimer, and complexes
with montmorillonite. J. Phys. Chem., v. 67, p. 2169,
BREEN, C.; LOUGHLIN, H. The competitive adsorp-
tion of methylene-blue on to na-montmorillonite from
binary-solution with n-alkylytrimethylammonium surfac-
tants. Clay Miner. , v. 29, p. 775-783, 1994.
BUJDAK, J.; KOMADEL, P. Interaction of methyl-
ene blue with reduced charge montmorillonite. J. Phys.
Chem. B, v. 101, p. 9065-9068, 1997.
CASTROACUNA, C. M.; FAN, F. R. F.; BARD, A. J.
Clay modified electrodes .8. Electrochemical-behavior at
montmorillonite and polypyrrole montmorillonite films
on platinum and glassy-carbon electrodes. J. Electroanal.
Chem., v. 234, p. 347-353, 1987.
CELIS R.; HERMOSIN, M. C.; CARRIZOSA, M. J.;
CORNEJO, J. Clay-herbicide complexes to retard picloram
leaching in soil. Int. J. Environ. Anal. Chem., v. 82, p. 503-
, 2002.
CELIS, R.; HERMOSIN, M. C.; CARRIZOSA, M. J.;CORNEJO, J. Inorganic and organic clays as carriers for
controlled release of the herbicide hexazinone. J. Agr. Food
Chem., v. 50, p. 2324-2330, 2002.
COSNIER, S.; LELOUS, K. A new strategy for the
construction of amperometric dehydrogenase electrodes
based on laponite gel-methylene blue polymer as the host
matrix. J. of Electroanal. Chem., v. 406, p. 243-246,
CSOBAN, K.; PARKANYI-BERKA, M.; JOO, P.;
BEHRA, PH. Sorption experiments of Cr(III) onto silica.
Colloids Surfaces A, v. 141 p. 347-364, 1998.
HU, S. S. Electrocatalytic reduction of molecular oxy-
gen on a sodium montmorillonite-methyl viologen carbon
paste chemically modified electrode. J. Electroanal.
Chem., v. 463, p. 253-257, 1999.
JOHN, S. A.; GOBI, K. V.; RAMASUBBU, A.;
RAMARAJ, R. Photoinduced electron-transfer reactions
at methylene-blue adsorbed nafion and clay coated elec-
trodes. Research Chem. Intermediates, v. 18, p. 203-210,
KAMAT, P. V.
Electrochemistry and
photoelectrochemistry of dye-incorporated clay-modified
electrode. J. Electroanal. Chem., v. 163, p. 389-394, 1984.
KUWABATA, S.; MITSUI, K.; YONEYAMA, H.
Preparation of polyaniline films doped with methylene
blue-bound nafion and the electrochromic properties of
the resulting films. J. Electroanal. Chem., v. 281 p. 97-
, 1990.
KUWABATA, S.; NAKAMURA, J.; YONEYAMA,
H. Dimerization kinetics of methylene-blue incorporated
in a nafion film. J. Electroanal. Chem., v. 261, p. 363-
, 1989.
LEI, C. H.; ZHANG, Z.; LIU, H.; KONG, J.; DENG, J.
Biosensoring of hydrogen peroxide using new methylene
blue N incorporated in a montmorillonite-modified horse-
radish peroxidase immobilization matrix as an electron
shuttle. Anal. Chim. Acta, v. 332, p. 73-81, 1996.
LIU, W. P.; GAN, J.Y.; YATES, S. R. Influence of
herbicide structure, clay acidity , and humic acid coating on
acetanilide herbicide adsorption on homoionic clays. J.
Agr. Food Chem., v. 50, p. 4003-4008, 2002.
MARGULIES, L.; ROZEN, H. Adsorption of methyl
green on montmorillonite, J. Mol. Struct., v. 141, p. 219-
, 1986.
MARGULIES, L.; ROZEN, H.; COHEN, E. “Energy
transfer at the surface of clays and protection of pesticides
from photodregadation. Nature, v. 315, p. 658-659, 1985.
NENNEMANN, A.; MISHAEL, Y.; NIR, S.; RUBIN,
B.; POLUBESOVA, T.; BERGAYA, F.; VAN DAMME, H.;
LAGALY, G. Clay based formulations of metolachlor with
reduced leaching. App. Clay Sci., v. 18, p. 265-275, 2001.
ONIKUBO, T.; LIN, R. J.; KANEKO, M. In-situ
twin-electrode spectrocyclic voltammetry with a cell com-
posed of a pair of nafion(r)-coated indium tin oxide elec-
trodes each incorporating ru(bpy)3(2+) and methylviologen. J. Electroanal. Chem., v. 361, p. 143-
, 1993.
RAUPACH, M.; EMERSON, W. W.; SLADE, P. G.
The arrangement of paraquat bound by vermiculite and
montmorillonite. J. Colloid Interface Sci., v. 69, p. 398-
, 1979.
RYTWO, G.; NIR, S.; MARGULIES, L. Interactions
of monovalent organic cations with montmorillonite -
adsorption studies and model-calculations. Soil Sci. Soc.
Am. J., v. 59, p. 554-564, 1995.
SHEN, B. E.; PENG, T. Z.; WANG, H. W. The elec-
trochemical-behavior of cationic and anionic dye-clay
modified electrodes. Electrochim. Acta, v. 39, n. 4, p. 527-
, 1994.
SHYU, S. C.; WANG, C. M. Characterizations of iron-
rich clay modified and their applications in optical recog-
nition. J. Electroanal. Chem., v. 440, p. 27-33, 1997.
SONG, C. J.; VILLEMURE, G. Preparation of clay-
modified electrodes by electrophoretic deposition of clay
films. J. Electroanal. Chem., v. 462, p. 143-149, 1999.
VILLEMURE, G., BARD, A. J. Clay modified elec-
trodes .9. Electrochemical studies of the electroactive frac-
tion of adsorbed species in reduced-charge and preadsorbed
clay films. J. Electroanal. Chem., v. 282, p. 107-121,
WHITE, J. R.; BARD, A. J. Clay modified electrodes
.4. The electrochemistry and electron-spin-resonance of
methyl viologen incorporated into montmorillonite films.
J. Electroanal. Chem., v. 197, p. 233-244, 1986.
ZEN, J. M.; CHEN, P. J. A selective voltammetric
method for uric acid and dopamine detection using clay
modified electrodes. Anal. Chem., v. 69, p. 5087-5093,
ZEN, J. M.; KUMAR, A. S.; CHEN, H. W. Electro-
chemical formation of Prussian blue in natural iron-
intercaleted clay and cinder matrixes. Electroanalysis, v.
, p. 542 - 545, 2000.