CdS-Intercalated Bentonite: A Novel Sulfide Ion Selective Electrode

CdS-intercalated bentonite was prepared by an in situ solid-solid reaction and mixed with artificial graphite, polytetrafluoroethylene (PTFE) and carboxymethyl cellulose (CMC) in an appropriate ratio to construct a novel, potentiometric sulfide ion selective electrode. Apart from its good selectivity, the electrode is low cost and good precision.

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CdS-Intercalated Bentonite/Carbon Composite as Electrode for Sulfide Ion

Materials Science Forum ◽

10.4028/www.scientific.net/msf.663-665.690 ◽

2010 ◽

Vol 663-665 ◽

pp. 690-693 ◽

Cited By ~ 3

Author(s):

Kemawadee Udomphan ◽

Atchana Wongchaisuwat ◽

Ladda Meesuk

Keyword(s):

Aqueous Solution ◽

Low Cost ◽

Carbon Composite ◽

Good Precision ◽

Solid Reaction ◽

Artificial Graphite ◽

Bright Yellow ◽

Photochemical Properties

CdS, a bright yellow precipitate is well known for its optical, electrical, electro-optical and photochemical properties. CdS has also been prepared in the interlayer spaces of layered materials such as laponite and montmorillonite (bentonite). Several properties of intercalated CdS have been studied, but for the best of our knowledge there is no reports on its use. In this work, we applied CdS-intercalated bentonite / carbon composite as an electrode for determination of S2- ion in aqueous solution. CdS- intercalated bentonite was prepared by the in situ solid-solid reaction between Cd(II)-bentonite and Na2S. To construct a potentiometric electrode, CdS-intercalated bentonite was mixed with artificial graphite, polytetrafluoroethylene (PTFE) and carboxymethylcellulose (CMC) in an appropriate ratio. The electrode was used to determine S2- in aqueous solution, graphs of log [S2-] vs measured voltage (mv) gave linear relation up to 3 orders of ion concentrations. Apart from the reproducibility and good precision, the electrode is good for its selectivity, durability and low cost.

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ZnS-Intercalated Montmorillonite: A Low Cost Potentiometric Sensor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.787.291 ◽

2013 ◽

Vol 787 ◽

pp. 291-295

Author(s):

Siriphorn Udkhao ◽

Atchana Wongchaisuwat ◽

Ladda Meesuk

Keyword(s):

Sodium Sulfide ◽

Low Cost ◽

Optoelectronic Devices ◽

Crystal Form ◽

Good Precision ◽

Solid Reaction ◽

Artificial Graphite ◽

Ion Concentrations ◽

Measured Voltage ◽

First Time

ZnS is well known for its potential uses, both in crystal form and powder, as optoelectronic devices and as a phosphor. In this work, we prepared ZnS-intercalated montmorillonite by the insitu solid-solid reaction between Zn (II)-montmorillonite and sodium sulfide. A potentiometric electrode was constructed from a mixture of ZnS-intercalated montmorillonite, artificial graphite, polytetrafluoroethylene (PTFE) and carboxymethylcellulose (CMC) in an appropriate ratio. The electrode was used to determine S2- in aqueous solution, graphs of log [S2-] vs. measured voltage gave linear relation up to 3rd order of ion concentrations. It can be said that, this is the first time that ZnS-intercalated montmorillonite is used to construct a potentiometric electrode. Apart from a good precision, the electrode is good for its selectivity, durability and low cost.

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