Electrochemical Behavior of Acid Orange 7 by Cyclic Voltammetry in Different Solvents

Ennouri, Rawdha; Panizza, Marco; Mhiri, Tahar; Elaoud, Sourour Chaâbane

doi:10.4152/pea.201705269

Cited by 6 publications

(1 citation statement)

References 34 publications

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“…The XPS binding energy for N, seen at ∼400 eV (Figure ), has often been attributed to an azo (−NN−) group, ,, as mentioned above. If these −NN– surface groups are indeed present, they can be electrochemically reduced to −NH 2 (Reactions and ) at <0.3 V (vs RHE) , and oxidized at >1 V vs RHE. − However, an oxidation process is not observed in the CV results for either VC–PhF 5 or CIC-22–PhF 5 (Figure ). Instead, the fluorinated carbons show an anodic current at >0.9 V much lower than that of the as-received ones.…”

Section: Resultsmentioning

confidence: 97%

Surface Characteristics of Microporous and Mesoporous Carbons Functionalized with Pentafluorophenyl Groups

Forouzandeh

Kakanat

et al. 2018

ACS Appl. Mater. Interfaces

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The in situ diazonium reduction reaction is a reliable and well-known approach for the surface modification of carbon materials for use in a range of applications, including in energy conversion, as chromatography supports, in sensors, etc. Here, this approach was used for the first time with mesoporous colloid-imprinted carbons (CICs), materials that contain ordered monodisperse pores (10-100 nm in diameter) and are inherently highly hydrophilic, using a common microporous carbon (Vulcan carbon (VC)), which is relatively more hydrophobic, for a comparison. The ultimate goal of this work was to modify the CIC wettability without altering its nanostructure and also to lower its susceptibility to oxidation, as required in fuel cell and battery electrodes, by the attachment of pentafluorophenyl (-PhF) groups onto their surfaces. This was shown to be successful for the CIC, with the -PhF groups uniformly coating the inner pore walls at a surface coverage of ca. 90% and allowing full solution access to the mesopores, while the -PhF groups deposited only on the outer VC surface, likely blocking its micropores. Contact angle kinetics measurements showed enhanced hydrophobicity, as anticipated, for both the -PhF modified CIC and VC materials, even revealing superhydrophobicity at times for the CIC materials. In contrast, water vapor sorption and cyclic voltammetry suggested that the micropores remained hydrophilic, arising from the deposition of smaller N- and O-containing surface groups, caused by a side reaction during the in situ diazonium functionalization process.

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Section: Resultsmentioning

confidence: 97%

Surface Characteristics of Microporous and Mesoporous Carbons Functionalized with Pentafluorophenyl Groups

Forouzandeh

Kakanat

et al. 2018

ACS Appl. Mater. Interfaces

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Kinetic and isotherm studies of Acid Orange 7 dye absorption using sulphonated mandarin biochar treated with TETA

Eleryan

Hassaan

Aigbe

et al. 2023

Biomass Conv. Bioref.

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This study contributes to the current state of knowledge by highlighting the physical–chemical interactions between biochar and dyes. The removal of Acid Orange 7 (AO7) dye by a modified biochar obtained from the wastes of mandarin peels (MPs) has been investigated in this work. A dehydration procedure with 80% H2SO4 under reflux was applied to produce an innovative biochar from MPs and then boiled with H2O2 and followed by boiling with triethylenetetramine to make mandarin biochar-C-TETA (MBCT). FTIR, SEM, EDX, BJH, BET, TGA, and DTA analyses were applied to investigate the MBCT. FTIR analysis showed an additional peak that confirmed the addition of the NH2 group to the MBCT structure. An amorphous carbon structure was also confirmed by XRD analysis. The AO7 dye solution pH was proved to give the best absorption at pH 2.0. Significant removal of AO7 dye 99.07% using an initial concentration of 100 mg/L of AO7 dye and a 0.75 g/L MBCT. The Langmuir (LNR) and Freundlich (FRH) isotherm models investigated the experimental results. The LNR was best suited to handle the working MBCT data. The maximum adsorption capacity (Qm) calculated for the MBCT was 312.5 mg/g using 0.25 g/L of the MBCT. Kinetic studies were conducted using the intraparticle diffusion (IND), film diffusion (FD), pseudo-first-order (PFOR), and pseudo-second-order (PSOR) models. The absorption rate was calculated using the ultimate value of the linear regression coefficient (R2 > 0.99), and the PSOR rate model was found to ideally describe the absorption process. The point of zero charge (pHPZC) was found to be 10.17. The electrostatic attractive-forces between the sorbent surface positively charged sites and negatively charged anionic dye molecules were the primary mechanism of the MBCT sorption of the AO7 dye’s anion absorption. The results indicate that the manufactured MBCT adsorbent may be useful for removing the AO7 dye from wastewater. MBCT can be used repeatedly for up to six cycles without dropping its absorption efficiency.

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Carbon nanotubes mediated chemical and biological decolorization of azo dye: Understanding the structure-activity relationship

Zhao

Hou

et al. 2022

Environmental Research

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Electrochemical Behavior of Acid Orange 7 by Cyclic Voltammetry in Different Solvents

Cited by 6 publications

References 34 publications

Surface Characteristics of Microporous and Mesoporous Carbons Functionalized with Pentafluorophenyl Groups

Surface Characteristics of Microporous and Mesoporous Carbons Functionalized with Pentafluorophenyl Groups

Kinetic and isotherm studies of Acid Orange 7 dye absorption using sulphonated mandarin biochar treated with TETA

Carbon nanotubes mediated chemical and biological decolorization of azo dye: Understanding the structure-activity relationship

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