scholarly journals Simultaneous Electrochemical Oxidation of Methylene Blue and Reduction of CO2 using CNTs/CF Electrodes

2020 ◽  
Author(s):  
Nhat Huy Luan ◽  
Yu-Ting Yang ◽  
Chiung-Fen Chang
Keyword(s):  
Methylene Blue ◽  
Electrochemical Oxidation ◽  
Degradation Kinetics ◽  
Chemical Vapor ◽  
Electrochemical Process ◽  
Green Energy ◽  
Applied Current ◽  
Reduction Activity ◽  
Oxidation Efficiency ◽  
Reduction Of Co2

Abstract Simultaneous degradation of methylene blue (MB) and reduction of CO2 by electrochemical process using CNTs/CF electrodes have been performed in various supporting electrolytes and applied current conditions in this study. The CNTs/CF electrodes have been successfully synthesized by chemical vapor deposition (CVD) method and employed as both cathode and anode in a two-compartment electrochemical cell. The synthesized electrodes were characterized by SEM and FTIR. The electrochemical oxidation efficiency of CNTs/CF electrodes in the anodic cell was evaluated using MB as model compound under electrolytes of H2SO4 and KHCO3 and applied currents of 10, 50 and 100 mA. The electrochemical reduction activity of CNTs/CF electrodes in the cathodic cell was assessed by the conversion of CO2 into CO and oxalic acid, and the generation of H2 under electrolytes of Na2SO4 and KHCO3 and a fixed applied current of 50 mA. The degradation kinetics of MB followed the pseudo-first-order model and the degradation efficiency was significantly affected by applied current rather than the sort of electrolyte under optimum condition. The optimal applied current can promote the high enough production of oxidant but also avoid electrode damage. The synthesized electrode of CNTs/CF combined with the electrochemical systems developed in this study provide a good solution for the simultaneous electrochemical oxidation of organic pollutants and reduction of CO2 to CO to yield H2 and CO, in which reaches the dual benefits of reduction of environmental hazards and production of green energy.

scholarly journals Performance and mechanism of methylene blue degradation by an electrochemical process

RSC Advances ◽  
2020 ◽  
Vol 10 (41) ◽  
pp. 24712-24720
Author(s):  
Xiaolei Teng ◽  
Junfeng Li ◽  
Zhaoyang Wang ◽  
Zhen Wei ◽  
Cuizhong Chen ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Electrochemical Oxidation ◽  
Electrochemical Process ◽  
Methylene Blue Degradation ◽  
Performance And Mechanism

An exciting electrochemical oxidation (EO) process has been developed.

scholarly journals Electrocatalytic CO2 Reduction: From Homogeneous Catalysts to Heterogeneous-Based Reticular Chemistry

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2835 ◽  
Author(s):  
Abdulhadi Al-Omari ◽  
Zain Yamani ◽  
Ha Nguyen
Keyword(s):  
Materials Science ◽  
Co2 Reduction ◽  
Covalent Bond ◽  
Electrochemical Process ◽  
Homogeneous Catalysts ◽  
Catalytic Systems ◽  
Biological Reduction ◽  
Porous Catalyst ◽  
Practical Applications ◽  
Reduction Of Co2

CO2, emitted mainly from fossil fuel combustion, is one of the major greenhouse gases. CO2 could be converted into more valuable chemical feedstocks including CO, HCOOH, HCHO, CH3OH, or CH4. To reduce CO2, catalysts were designed and their unique characteristics were utilized based on types of reaction processes, including catalytic hydrogenation, complex metal hydrides, photocatalysis, biological reduction, and electrochemical reduction. Indeed, the electroreduction method has received much consideration lately due to the simple operation, as well as environmentally friendly procedures that need to be optimized by both of the catalysts and the electrochemical process. In the past few decades, we have witnessed an explosion in development in materials science—especially in regards to the porous crystalline materials based on the strong covalent bond of the organic linkers containing light elements (Covalent organic frameworks, COFs), as well as the hybrid materials that possess organic backbones and inorganic metal-oxo clusters (Metal-organic frameworks, MOFs). Owing to the large surface area and high active site density that belong to these tailorable structures, MOFs and COFs can be applied to many practical applications, such as gas storage and separation, drug release, sensing, and catalysis. Beyond those applications, which have been abundantly studied since the 1990s, CO2 reduction catalyzed by reticular and extended structures of MOFs or COFs has been more recently turned to the next step of state-of-the-art application. In this perspective, we highlight the achievement of homogeneous catalysts used for CO2 electrochemical conversion and contrast it with the advances in new porous catalyst-based reticular chemistry. We then discuss the role of new catalytic systems designed in light of reticular chemistry in the heterogeneous-catalyzed reduction of CO2.

scholarly journals Electrochemical Oxidation of Methylene Blue in Aqueous Solution

2015 ◽  
Vol 6 (5) ◽  
pp. 352-355 ◽  
Author(s):  
H. M. A. Asghar ◽  
◽  
T. Ahmad ◽  
S. N. Hussain ◽  
H. Sattar
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Electrochemical Oxidation

Understanding small-molecule electro-oxidation on palladium based compounds – a feature on experimental and theoretical approaches

2018 ◽  
Vol 47 (24) ◽  
pp. 7864-7869 ◽  
Author(s):  
Saurav Ch. Sarma ◽  
Sebastian C. Peter
Keyword(s):  
Fuel Cells ◽  
Formic Acid ◽  
Small Molecules ◽  
Electrochemical Oxidation ◽  
Small Molecule ◽  
Energy Production ◽  
Green Energy ◽  
Theoretical Approaches ◽  
Electro Oxidation

Electrochemical oxidation of small molecules such as ethanol, methanol and formic acid on Pd based compounds has a great impact on green energy production in fuel cells.

scholarly journals Elucidation and Characterization of New Chlorinated By-Products after Electrochemical Degradation of Hydrochlorothiazide Using Graphite–Poly Vinyl Chloride Electrode

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 540
Author(s):  
Zainab Mussa ◽  
Fouad Al-Qaim ◽  
Ali Yuzir ◽  
Hirofumi Hara ◽  
Shamila Azman ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Treatment Process ◽  
Oxidation Process ◽  
Electrochemical Treatment ◽  
Electrochemical Process ◽  
Experimental Conditions ◽  
E Coli ◽  
Flight Mass Spectrometry ◽  
Negative Ionization ◽  
By Products

This paper describes an electrochemical treatment process of hydrochlorothiazide (HDZ) under different conditions such as initial concentration, sodium chloride and applied voltage. In this present study, HDZ was treated by electrochemical oxidation process using graphite-PVC composite electrode as anode and Platinum (Pt) as cathode. All results were analyzed using liquid chromatography-time of flight/mass spectrometry (LC-TOF/MS). It was found that at high applied voltages, and high amounts of NaCl, the electrochemical treatment process was more efficient. The removal% of HDZ was 92% at 5 V after 60 min. From the obtained results, the electrochemical oxidation process of HDZ followed pseudo first order with rate constant values ranged between 0.0009 and 0.0502 min−1, depending on the experimental conditions. Energy consumption was also considered in this study, it was ranged between 0.9058 and 5.56 Wh/mg using 0.5, 0.3 and 0.1 g NaCl within interval times of (10, 20, 30, 40, 50, 60, 70, and 80 min). Five chlorinated and one non-chlorinated by-products were formed and analyzed in negative ionization (NI) mode during the electrochemical process. Due to the strong oxidizing potential of the chlorine (Cl2) and hypochlorite ion (ClO−), HDZ and its by-products were removed after 140 min. Furthermore, a novel synthesis of chlorothiaizde as one of the new by-products was reported in this present study. Toxicity was impacted by the formation of the by-products, especially at 20 min. The inhibition percentage (I%) of E. coli bacteria was decreased to be the lowest value after 140 min.

Photocatalytic Degradation of Methylene Blue by the La-N/TiO2 Composite and its Kinetic Enumeration

2017 ◽  
Vol 863 ◽  
pp. 20-25 ◽  
Author(s):  
Jing Li Gao ◽  
Ying Hui Han ◽  
Yu Juan Li ◽  
Xiao Hong Zhang
Keyword(s):  
Methylene Blue ◽  
Composite Material ◽  
Kinetic Model ◽  
Photocatalytic Degradation ◽  
Degradation Kinetics ◽  
Synergistic Effects ◽  
Kinetic Mechanism ◽  
Order Kinetic ◽  
Doping Amount ◽  
Preparation Conditions

Photocatalytic degradation kinetics of methylene blue in aqueous solution was systematically investigated using Ti-based composite material as the photocatalyst. The single-variable-at-a-time ( SVAT) method was employed. It studied the individual and synergistic effects of several classical parameters on photocatalytic efficiencies. The kinetic mechanism was systematically explored. The kinetics effects of the doping amount of La and N, calcination temperature and time, light intensity were studied in detail. The factors on the degradation of MB were in accordance with the pseudo first order kinetic model. This kinetic model followed the Langmuir–Hinshelwood model. The best preparation conditions were found in the experiments. It is proved that the Ti-based composite material is an effective adsorbent for the degradation of dye contaminated water.

Degradation Kinetics and Mechanics of Methylene Blue by Complex Ultraviolet and Hydrogen Peroxide Process

2011 ◽  
Vol 356-360 ◽  
pp. 1066-1069
Author(s):  
Hang Xu ◽  
Qiang Tang ◽  
Ya Na Liu ◽  
Yong Jiang ◽  
Hong Yan Tang
Keyword(s):  
Hydrogen Peroxide ◽  
Methylene Blue ◽  
Reaction Rate ◽  
Degradation Kinetics ◽  
Degradation Process ◽  
Hyperbolic Model

Hyperbolic model could be established to describe the degradation performance of Methylene Blue (MB) using UV/H2O2 process. The effects of initial H2O2 dosage on MB removal, instant ▪OH concentration and reaction rate were investigated. The results show that the optimal H2O2 dosage is 13.24 mM and after 50min the MB removal is around 85%. The MB degradation process is followed the hyperbolic model which can calculate instant ▪OH concentration and reaction rate.

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