Novel surfactant selective electrochemical sensors based on single walled carbon nanotubes

被引:50
作者
Najafi, Mojgan [2 ]
Maleki, Layla [1 ]
Rafati, Amir Abbas [1 ]
机构
[1] Bu Ali Sina Univ, Dept Phys Chem, Fac Chem, Hamadan 65174, Iran
[2] Hamedan Univ Technol HUT, Dept Mat Engn, Hamadan, Iran
关键词
Surfactant; Ion selective electrode; Carbon nanotube; Selectivity coefficient; SODIUM DODECYL-SULFATE; POLYMERS POLY(PROPYLENE OXIDE); CATIONIC SURFACTANTS; CETYLTRIMETHYLAMMONIUM BROMIDE; ETHYL(HYDROXYETHYL) CELLULOSE; POTENTIOMETRIC SENSORS; PREPARED POLYPYRROLE; ANIONIC SURFACTANTS; ETHYLENE-GLYCOL; ELECTRODES;
D O I
10.1016/j.molliq.2011.01.013
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
New poly(vinyl chloride) PVC membrane electrodes selective to the hexadecyltrimethylammonium ion (CTA(+)) and sodium dodecyl ion (SD-) have been constructed using a modified single walled carbon nanotube (SWCNT). This sensor was used as a sensing material and incorporated into the plasticized PVC-membrane. The membrane electrodes exhibited a Nernstian response (59.5 mV/decade) for SDS and a near-Nernstian response (57.2 mV/decade) for CTAB over a wide concentration range below their critical micelle concentrations (CMC). The electrodes showed a fast response time (t90% = 30 s) and could be used for 3 months without any divergence in potentials. The SD- ion selective electrode (ISE) can determine monomer units down to concentrations as low as 1.9 x 10(-6) M and 5.2 x 10(-6) M for CTA(+). The effect of foreign anions along with primary ions on the performance of ion-selective electrode is investigated in terms of potentiometric selectivity coefficients, which were determined using the fixed primary method (FPM) at 5.0 x 10(-5) M concentration of surfactant ions. The two proposed potentiometric sensors revealed acceptable selectivities for surfactant ions over a wide variety of other common inorganic and organic anions. The lifetime of the sensor is more than three months. This method for determining of anionic surfactants was found to be quite accurate when compared with classical methods. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:226 / 229
页数:4
相关论文
共 35 条
[1]   Determination of cationic surfactants in environmental samples by flow injection analysis [J].
Agrawal, K ;
Agnihotri, G ;
Shrivas, K ;
Mundhara, GL ;
Patel, KS ;
Hoffmann, P .
MICROCHIMICA ACTA, 2004, 147 (04) :273-278
[2]  
Alizadeh N, 2000, ELECTROANAL, V12, P509, DOI 10.1002/(SICI)1521-4109(200005)12:7<509::AID-ELAN509>3.0.CO
[3]  
2-U
[4]   Linear alkylbenzenesulfonate (LAS) ion-selective electrode based on electrochemically prepared polypyrrole and PVC [J].
Alizadeh, N ;
Khodaei-Tazekendi, H .
SENSORS AND ACTUATORS B-CHEMICAL, 2001, 75 (1-2) :5-10
[5]  
[Anonymous], 1967, TENSIDE
[6]   Potentiometric sensors for trace-level analysis [J].
Bakker, E ;
Pretsch, E .
TRAC-TRENDS IN ANALYTICAL CHEMISTRY, 2005, 24 (03) :199-207
[7]   CONSTRUCTION AND DEVELOPMENT OF ION-SELECTIVE ELECTRODES RESPONSIVE TO ANIONIC SURFACTANTS [J].
BAROROMA, J ;
SANCHEZ, J ;
DELVALLE, M ;
ALONSO, J ;
BARTROLI, J .
SENSORS AND ACTUATORS B-CHEMICAL, 1993, 15 (1-3) :179-183
[8]   Carbon nanotubes - the route toward applications [J].
Baughman, RH ;
Zakhidov, AA ;
de Heer, WA .
SCIENCE, 2002, 297 (5582) :787-792
[9]   EMF studies associated with the binding of cetyltrimethylammonium bromide to the polymers poly(propylene oxide), poly(vinylmethylether), and ethyl(hydroxyethyl) cellulose [J].
Bloor, DM ;
Mwakibete, HKO ;
WynJones, E .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1996, 178 (01) :334-338
[10]   EQUILIBRIUM AND KINETIC-STUDIES ASSOCIATED WITH THE BINDING OF SODIUM DODECYL-SULFATE TO THE POLYMERS POLY(PROPYLENE OXIDE) AND ETHYL(HYDROXYETHYL) CELLULOSE [J].
BLOOR, DM ;
WANYUNUS, WMZ ;
WANBADHI, WA ;
LI, Y ;
HOLZWARTH, JF ;
WYNJONES, E .
LANGMUIR, 1995, 11 (09) :3395-3400