A New Silver Electrode Based on the Composite Silver Sulfide/Attapulgite as Ionophore

Authors

Wen-zhuo LI, Department of Chemistry and Material Science, Nanjing Forestry University, Nanjing 210037, China;Follow
Ding-jia XU, Department of Chemistry and Material Science, Nanjing Forestry University, Nanjing 210037, China;
Jun WANG, Department of Chemistry and Material Science, Nanjing Forestry University, Nanjing 210037, China;
Jian-long WANG, Department of Chemistry and Material Science, Nanjing Forestry University, Nanjing 210037, China;

Corresponding Author

Wen-zhuo LI(wzli@njfu.com.cn)

Abstract

A novel silver ion selective electrode with its ionophore being a kind of organic/inorganic composite composed of silver sulfide and attapulgite has been prepared. Attapulgite is a type of natural inorganic polymer which has some properties similar to zeolite, such as a higher specific surface area and plenty of intercrystalline cavities. In this work, the silver ions were firstly adosrbed in the micropores of the attapulgite, then thioacetamidetiny was selected to mix with the prepared silver ions/ attapulgite composite. Owning to the existence of sulfur atoms in the structure of thioacetamide molecules, thioacetamide molecules can react with the silver ions/attapulgite composite so that tiny silver sulfide particles were formed within the pores of attapulgite. Experimental results showed that the prepared silver ion selective electrode with the silver sulfide/attapulgite composite as the ionophore exhibited the better linear responses toward silver ion measured and the quick response time (about 3 s). And effects of the concentration of thioacetamide on starting material, depth of electrode membrane, amount of plastic agent, pH of measured solution on the silver electrode performance had been investigated in this work. Experimental results also proved that the silver electrode displayed a proximate Nernst response with a linear slope of 48 mV·decade^-1 in the silver concentrations from 1.0×10^-1 to 1.0×10^-6 mol·L^-1. Within the range of pH = 2.0 ~ 8.0, the potential of the silver electrode had a better stability in 72 h. Also, the silver electrode showed better anti-interference in the measured solution containing some common metal ions like Na⁺, Ca²⁺, Fe²⁺ and Cu²⁺ etc.

Graphical Abstract

Keywords

attapulgite, silver ion selective electrode, ionophore, silver sulfide, electrode stability

DOI Link

https://doi.org/10.13208/j.electrochem.130811

Publication Date

2014-06-28

Online Available Date

2013-11-30

Revised Date

2013-11-05

Received Date

2013-08-11

Recommended Citation

Wen-zhuo LI, Ding-jia XU, Jun WANG, Jian-long WANG. A New Silver Electrode Based on the Composite Silver Sulfide/Attapulgite as Ionophore[J]. Journal of Electrochemistry, 2014 , 20(3): 277-281.
DOI: 10.13208/j.electrochem.130811
Available at: https://jelectrochem.xmu.edu.cn/journal/vol20/iss3/10