Voltammetry and spectroelectrochemistry of solid indigo dispersed in carbon paste

He, Jianbo; Ma, Guang-He; Chen, Jun-Cong; Yao, Ye; Wang, Yan

doi:10.1016/j.electacta.2010.03.064

Cited by 18 publications

(6 citation statements)

References 44 publications

(82 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The spectrum of the initial solution was taken as reference for the UV-vis absorption spectra. As can be noticed, two absorption bands emerge in the UV-vis spectra at 372 and 617 nm [64]. Fig.…”

Section: Removal Of Indigo Carminementioning

confidence: 62%

Spectroelectrochemical monitoring of contaminants during the electrochemical filtration process using free-standing carbon nanotube filters

Ibáñez

Gómez

Vallés

et al. 2018

Electrochimica Acta

View full text Add to dashboard Cite

Real-time process monitoring is still relatively scarce but is fundamental to provide in-situ information about different chemical and electrochemical processes. Particularly, electrochemical filtration has received growing attention in recent years due to the wide range of applications in which it can be successfully employed. Electrochemical removal is considered as an attractive methodology for the treatment of wastewater due to its efficiency in the removal of a huge number of contaminants. In this work, the development of a new device based on the use of UV-vis bare optical fibers in long optical pathway configuration allows us to monitor continuously the electrochemical degradation process during the filtration of different compounds. Spectroelectrochemistry additionally supplies quantitative information allowing us to calculate the efficiency of the electrochemical filtration process. The material selected to fabricate the electrochemical filter was single-walled carbon nanotubes that display not only high physical and chemical stability, but also high electrical conductivity. Therefore, the combination of electrochemical degradation methods, free-standing single-walled carbon nanotube filters and operando spectroelectrochemical techniques makes this outstanding device very interesting in the study of different molecules. As proof of concept, three different systems have been studied to validate the cell and demonstrate the good performance of the spectroelectrochemical device: otolidine (reference system), indigo carmine (organic dye), and 4-nitrophenol (hazardous pollutant).

show abstract

Section: Removal Of Indigo Carminementioning

confidence: 62%

Spectroelectrochemical monitoring of contaminants during the electrochemical filtration process using free-standing carbon nanotube filters

Ibáñez

Gómez

Vallés

et al. 2018

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…Carbon paste electrodes have advantages of low background currents, low noise, and fast baseline stabilization, and the fabrication was described previously. 29,30 A common single-compartment cell was used for conventional voltammetric measurements. A thin-layer UV−vis spectroelectrochemical cell was self-made, using a standard quartz photometric cell with 10 mm optical path length as the cell body.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Unlike liquid-oil carbon paste, the surface of solid EAGPE can withstand polish on an emery paper and ultrasonic cleaning for about 10 s. The EAGPE used in a common cell was discal with a smaller geometrical area of 0.049 cm 2 , whereas the EAGPE used in thin-layer cells was quadrate with a larger area of 0.80 cm 2 . Carbon paste electrodes have advantages of low background currents, low noise, and fast baseline stabilization, and the fabrication was described previously. , …”

Section: Experimental Methodsmentioning

confidence: 99%

Thin Layer-Based Spectral and Electrophoretic Study of Electro-Oxidation of Solid Ellagic Acid

Chen

Deng

Hu³

et al. 2014

J. Phys. Chem. B

Self Cite

View full text Add to dashboard Cite

Acquisition of data from both in situ spectroscopy detection and online chromatography-like separation is important for studying complex electrochemical reactions. The present work provides an example of combination of thin-layer spectral and electrophoretic electrochemistry, both based on thin-layer electrolysis. Two thin-layer electrochemical cells were used to investigate the electro-oxidation of solid ellagic acid at different potentials, in acidic, physiological, and alkaline buffer media. UV-vis spectra and cyclic voltabsorptograms of the oxidation products were recorded in situ without interference from the solid reactant. Four oxidation products, depending upon the buffer pH and the applied potential, were separated and detected by electrophoretic electrochemistry. The major products possess redox stability, possibly with a diquinonemethide structure. The minor product is considered as an o-quinone derivative with a lactone-ring-opening, which can be reduced or further oxidized at appropriate potentials. A consecutive-parallel reaction mechanism is proposed for the formation of four products of ellagic acid in different pH media, which enriches the knowledge about the oxidation pathway and antioxidant property of this biologically active polyphenol compound.

show abstract

“…Most organic media systems are anthraquinones and their derivatives, which have relatively low conversion rate on electrodes and poor regeneration ability (Bechtold et al , 2010). The inorganic media system is mainly composed of iron complexes, and its reduction potential is relatively high (He et al , 2010). At present, inorganic media systems have been generally developed into ferric salt mono ligands, ferric salt mixed ligands and ferric calcium binucleate complexes.…”

Section: Introductionmentioning

confidence: 99%

Optimization and assessment on indirect electrochemical reduction of indigo

Wang

et al. 2019

PRT

View full text Add to dashboard Cite

Purpose An indirect electrochemical reduction and dyeing with indigo were carried out here to solve problems of low dye reduction rate and poor dyeing depth in the current electrochemical dyeing process. Design/methodology/approach Response surface analysis tests were performed to evaluate the effects of ferrous sulfate concentration, medium concentration, sodium hydroxide concentration and reduction time on the reduction efficiency of indirect electrochemical reduction of indigo. Findings The conditions obtained by design-expert optimization showed that the concentration of FeSO4·7H2O has the most significant effect on the reduction performance of dye liquor. Under the optimized electrochemical reduction dyeing process, the rate of dye reduction could be reached 91.21 per cent and the K/S value of indirect electrochemical dyeing of indigo can be achieved to 12.96, which is increased by about 9.56 per cent compared with that of Na2S2O4 dyeing with the same color fastness basically. Research limitations/implications The recyclability and biodegradability of the dye remain to be explored. Practical implications The strategy presented here can be developed to replace a substantial part of electrochemical dyeing with optimized product quality and reduced environmental pollution in denim production. Social implications The strategy presented here can be developed to replace a substantial part of electrochemical dyeing with optimized product quality and reduced environmental pollution in denim production. Originality/value Application of the Fe(II)-DGS-Abal B complex media system in the indirect electrochemical reduction of indigo.

show abstract

Voltammetry and spectroelectrochemistry of solid indigo dispersed in carbon paste

Cited by 18 publications

References 44 publications

Spectroelectrochemical monitoring of contaminants during the electrochemical filtration process using free-standing carbon nanotube filters

Spectroelectrochemical monitoring of contaminants during the electrochemical filtration process using free-standing carbon nanotube filters

Thin Layer-Based Spectral and Electrophoretic Study of Electro-Oxidation of Solid Ellagic Acid

Optimization and assessment on indirect electrochemical reduction of indigo

Contact Info

Product

Resources

About