Study of the electrolytic reduction of Cr(VI) in aqueous solutions of chromic acid by the rotating disc electrode method

1978 ◽  
Vol 56 (15) ◽  
pp. 2042-2048 ◽  
Author(s):  
Hélio C. Chagas
Keyword(s):  
Chromic Acid ◽  
Reduction Process ◽  
Electrochemical Process ◽  
Chloride Ions ◽  
Rotating Disc Electrode ◽  
Disc Electrode ◽  
Concentrated Solutions ◽  
Rotating Disc ◽  
Previous Suggestion ◽  
Electrode Method

The Cr6+/Cr3+ reduction in aqueous solution is studied in the presence of sulfate and chloride ions by the rotating disc electrode method. In the low chromic acid concentration region, the results exhibit some differences in relation to those obtained using more concentrated solutions. However, it is demonstrated that in the presence of sulfate and chloride ions there is a chemical reaction preceding the electrochemical process, confirming a previous suggestion. Results for Cr6+/Cr3+ reduction process in perchloric acid medium at various temperatures are presented and a reduction mechanism is suggested.

Adsorption phenomena in solutions of some anthraquinonesulfonic acids: Factors responsible for postwaves

1983 ◽  
Vol 48 (2) ◽  
pp. 550-559 ◽  
Author(s):  
Eugeniya Savenko ◽  
Gurami Tedoradze
Keyword(s):  
Reduction Process ◽  
Electrode Reaction ◽  
Rotating Disc Electrode ◽  
Disc Electrode ◽  
Rotating Disc ◽  
Sulfonic Acids ◽  
Adsorption Phenomena

The comparison of the adsorption of anthraquinone-1,5-disulfonic, anthraquinone-1-sulfonic acids and respective reduced compounds shows that the appearance of polarographic adsorption waves is connected with partial (in the case of postwave) and complete (in the case of prewave) inhibition of the reduction process by the reduction products. The number of electrons involved in the reaction has been determined (n = 2 and 4 for di- and monoacid, respectively). Using rotating disc electrode the order of the electrode reaction equal to one has been found.

Electrochemical properties of gold and glassy carbon electrodes electrografted with an anthraquinone diazonium compound using the rotating disc electrode method

RSC Advances ◽  
2016 ◽  
Vol 6 (47) ◽  
pp. 40982-40990 ◽  
Author(s):  
M. Mooste ◽  
E. Kibena-Põldsepp ◽  
M. Marandi ◽  
L. Matisen ◽  
V. Sammelselg ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Glassy Carbon ◽  
Carbon Electrodes ◽  
Rotating Disc Electrode ◽  
Disc Electrode ◽  
Rotating Disc ◽  
Glassy Carbon Electrodes ◽  
Electrode Method

The RDE method was combined with the electrografting procedure to prepare thick AQ films on Au and glassy carbon electrodes.

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