摘要
四磺酸酞菁钴配合物阴离子 ( Co Pc TS4- )在水溶液中可借助离子交换进入阳离子表面活性剂双十二烷基二甲基溴化铵 ( DDAB)薄膜 ,从而形成 Co Pc TS4- DDAB薄膜电极 .循环伏安法表明 ,该薄膜电极在 p H7.0的空白缓冲溶液中十分稳定 ,有两对准可逆的还原氧化峰 ,其中第一对峰的 Epc1 =-0 .2 8V,Epa1 =-0 .1 8V( vs.SCE) ,为中心离子 Co( ) Co( )的还原氧化峰 ;第二对峰的 Epc2 =-1 .30 V,Epa2 =-1 .1 8V,为酞菁环的还原氧化峰 .应用循环伏安法估计了该薄膜体系的电荷传递扩散系数 Dct和表观非均相电极反应速率常数 ko .Co Pc TS4- DDAB薄膜电极可用于对三氯乙酸 ( TCA)的电化学催化还原 .催化电流与 TCA浓度在 4× 1 0 - 5～ 1× 1 0 - 3 mol L范围内成线性关系 .
Cobalt phthalocyanine tetrasulfonate (CoPcTS\+\{4-\}) anions in aqueous solutions could enter the films of cationic surfactant didodecyldimethylammonium bromide (DDAB) films by ion exchange and form CoPcTS\+\{4-\}\|DDAB film electrodes. Cyclic voltammetry (CV) showed in pH 7.0 blank buffers, the films were quite stable and had two pairs of quasireversible redox peaks. The first pair shown at \%E\%\-\{pc1\} = -0.28 V and \%E\%\-\{pa\-1\}=-0.18 V (\%vs.\% SCE) was attributed to the redox couple of Co(II)/Co(I) of CoPcTS\+\{4-\}, while the second set at \%E\%\-\{pc\-2\}=-1.30 V and \%E\%\-\{pa\-2\}=-1.18 V corresponds to the redox process of phthalocyanine ring. The charge transport diffusion coefficient, \%D\%\-\{ct\}, and apparent heterogeneous electrode reaction rate constant, \%k\%\+\{o\}, were estimated by CV. CoPcTS\+\{4-\}\|DDAB films could be used to catalyze electrochemical reduction of trichloroacetic acid (TCA). Catalytic current had a linear relationship with the concentration of TCA in the range of 4×10\+\{-5\}-1×10\+\{-3\} mol/L.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第8期1200-1204,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金! (批准号 :2 9375 1 92 )资助课题
关键词
四磺酸酞菁钴
表面活性剂
薄膜电极
电化学催化
Cobalt phthalocyanine tetrasulfonate
Surfactant film electrode
Electrochemistry
Electrochemical catalysis.
