Electrochemical micropipette-tip for low-cost environmental applications: Determination of anionic surfactants through their interaction with methylene blue

Talanta ◽  
2021 ◽  
Vol 224 ◽  
pp. 121732
Author(s):  
Andrea González-López ◽  
Estefanía Costa-Rama ◽  
M. Teresa Fernández-Abedul
Keyword(s):  
Methylene Blue ◽  
Anionic Surfactants ◽  
Low Cost ◽  
Environmental Applications

scholarly journals Selective Determination of Dopamine in Presence of Ascorbic Acid Using Nafion Coated Methylene Blue Functionalized Graphite Electrode

2019 ◽  
Vol 31 (10) ◽  
pp. 2185-2190
Author(s):  
G. Sivasankari ◽  
K. Sivasankari ◽  
T. Nalini ◽  
P. Padmapriya ◽  
M. Nadhiya
Keyword(s):  
Methylene Blue ◽  
Ascorbic Acid ◽  
Modified Electrode ◽  
Electrode Surface ◽  
Graphite Electrode ◽  
Low Cost ◽  
Differential Pulse ◽  
Selective Determination ◽  
The Stability

An electrochemical sensor has been developed using methylene blue (MB) unctionalized graphite for the selective determination of dopamine in the presence of ascorbic acid. The immobilization of methylene blue on graphite was done by carbodiimide coupling method. The methylene blue functionalized graphite was characterized by SEM, FTIR spectroscopy and UV-visible spectroscopy. The immobilization of methylene blue functionalized graphite (MB-G) on the electrode surface was made by drop casting a small volume of MB-G dispersed methanol solution on the electrode surface. About 5 L of 0.5 % Nafion solution was also dropcasted for the stability and selectivity. The MB-G modified electrode was characterized by cyclic voltammetry. The modified electrode promotes the electrocatalytic oxidation of dopamine at a lower potential of 160 mV. The selective determination of dopamine in the presence of 100 times higher concentration of ascorbic acid was achieved by differential pulse voltammetry. The modified electrode offered a simple, selective and sensitive determination of low levels of dopamine. Also the oxidation over potential was reduced to an extent of 360 mV comparing with the bare graphite electrode. The proposed sensor has the advantage of easy fabrication, low cost, good sensitivity, reproducibility and stability.

scholarly journals Coriandrum Sativum seeds as a green low-cost biosorbent for methylene blue dye removal from aqueous solution: spectroscopic, kinetic and thermodynamic studies

2018 ◽  
Vol 7 (3) ◽  
pp. 204-216
Author(s):  
Lamya Kadiri ◽  
Abdelkarim Ouass ◽  
Youness Essaadaoui ◽  
El Housseine Rifi ◽  
Ahmed Lebkiri
Keyword(s):  
Methylene Blue ◽  
Low Cost ◽  
Coriandrum Sativum ◽  
Blue Dye ◽  
Solution Ph ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Adsorption Rates ◽  
Efficient Power

Coriandrum sativum seeds (CSS) were investigated as a new eco-friendly and economic biosorbent for the removal of methylene blue (MB) dye from synthetic solutions. First, the spectroscopic analyses were effectuated using FTIR and SEM to confirm the possibility of CSS to remove MB dye from aqueous solutions. The study of the influence of different parameters, such as contact time, CSS mass, solution pH, MB concentration, and temperature was realized and proved the rapid and efficient power adopted by CSS as a removal of the studied dye. Also, the regeneration study was effectuated for four cycles with excellent adsorption rates. The modeling studies revealed that the studied process obeys the pseudo-second-order model and Langmuir isotherm model. The adsorption amount was found to be 107.53 mg/g. Finally, the determination of thermodynamic parameters indicated the exothermic and spontaneous type of the removal process of MB onto CSS.

Determination of anionic surfactants in real samples using a low-cost and high sensitive solid contact surfactant sensor with MWCNTs as the ion-to-electron transducer

2017 ◽  
Vol 9 (15) ◽  
pp. 2305-2314 ◽  
Author(s):  
Nikola Sakač ◽  
Maja Karnaš ◽  
Marija Jozanović ◽  
Martina Medvidović-Kosanović ◽  
Sanja Martinez ◽  
...  
Keyword(s):  
Anionic Surfactants ◽  
Low Cost ◽  
Fast Response ◽  
Solid Contact ◽  
Real Samples ◽  
Long Life ◽  
Pencil Lead

Long-life, low-cost and fast-response graphite pencil lead surfactant sensors based on MWCNTs.

scholarly journals Elimination of Methylene Blue by low-cost Biomaterial prepared from Local Natural Residue

2020 ◽  
Vol 2 (01) ◽  
pp. 60-66
Author(s):  
Fatma LANSARI ◽  
Meryem EDJEKOUANE ◽  
Omar KHELIFI ◽  
Ishak BOUKHETECHE ◽  
Ishak LAKSACI
Keyword(s):  
Methylene Blue ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Freundlich Model ◽  
Batch System ◽  
Natural Support ◽  
Uv Visible

This study aims to assess the use of natural waste (fruit kernels) for the preparation of a bimaterial in order to use it as a natural support for the elimination of a dye (methylene blue) from aqueous solutions for environmental protection. The biomaterial was characterized physicochemically and the determination of methylene blue concentration was carried out by a UV-Visible spectrophotometer. In order to clarify the adsorption process, experiments in a batch system were carried out to study the effect of operating parameters such as the initial concentration of methylene blue (2-10 mg·L-1), biomaterial (0.1-1 g) and the contact time (10-120 min). To describe the adsorption equilibrium, the experimental data were analyzed by the Langmuir isotherm and the Freundlich isotherm. The equilibrium is perfectly described by the Freundlich model (R2>0.99) and the adsorption process is multilayer. The results of the present study suggest that washingtonia seed (WS) can be advantageously used as a low-cost biosorbent for water discoloration

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