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Acta Physico-Chimica Sinica  2007, Vol. 23 Issue (06): 964-968    DOI: 10.3866/PKU.WHXB20070634
Note     
Influence of m-4-m Structured Gemini Surfactants on the Adsorption-Stripping Voltammetric Behavior of Methylene Blue on a Platinum Electrode
PAN Shen-Min; ZHOU Qin; ZHAO Fa-Qiong; ZENG Bai-Zhao

College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China

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Abstract  

In 0.050 mol·L-1 phosphate buffer solution (pH=6.4), methylene blue (MB) exhibited a pair of small peaks at about -0.2 V on a platinum electrode. In the presence of m-4-m structured Gemini surfactants, such as Br-C16H33N+-(CH3)2-C4H8-N+(CH3)2C16H33Br-, Br -C12H25N+(CH3)2-C4H8-N+(CH3)2C12H25Br-, and Br -C8H17N+(CH3)2-C4H8-N+-(CH3)2C8H17Br-, the anodic peak of MB grewrapidly but the cathodic peak decreased, and the peak potentials moved in positive direction due to the associated adsorption of Gemini surfactants and MB on the electrode surface. The influence of Gemini surfactants increased with their length of alkyl chain growing. When their concentrations were enhanced, the anodic peak increased firstly and then lowered. For Br-C16H33N+(CH3)2-C4H8-N+(CH3)2C16H33Br- the anodic peak of 5 μmol·L-1 MB achieved the maximum when its concentration was 15 μmol·L-1. In addition, solution pH and accumulation potential also showed effect on their adsorption behavior.



Key wordsGemini surfactants      Methylene blue      Adsorption-stripping voltammetry      Platinumelectrode     
Received: 27 October 2006      Published: 21 April 2007
MSC2000:  O647  
Corresponding Authors: ZHAO Fa-Qiong     E-mail: zhaofq@chem.whu.edu.cn
Cite this article:

PAN Shen-Min; ZHOU Qin; ZHAO Fa-Qiong; ZENG Bai-Zhao. Influence of m-4-m Structured Gemini Surfactants on the Adsorption-Stripping Voltammetric Behavior of Methylene Blue on a Platinum Electrode. Acta Physico-Chimica Sinica, 2007, 23(06): 964-968.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20070634     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2007/V23/I06/964

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