scholarly journals Enhancement of the electro-activated persulfate process in dye removal using graphene oxide nanoparticle

2021 ◽  
Author(s):  
Bita Ayati ◽  
Zeinab Ghorbani
Keyword(s):  
Graphene Oxide ◽  
Current Density ◽  
Dye Removal ◽  
Electrochemical Process ◽  
Sodium Persulfate ◽  
Sulfate Concentration ◽  
Oxide Nanoparticle ◽  
Acid Blue ◽  
A Current ◽  
Activated Persulfate

Abstract This study aimed to improve the speed of the electrochemical process by graphene oxide nanoparticle as a current accelerator in Acid Blue 25 removal from aqueous solutions. To do so, the effect of different parameters including pH, dye concentration, sodium persulfate concentration, the ratio of sodium persulfate to iron (II) sulfate concentration, current density, and the distance between electrodes was investigated on dye removal. Under optimal conditions of pH = 5, dye concentration = 200 mg/L, sodium persulfate concentration = 500 mg/L, iron (II) sulfate concentration = 100 mg/L, current density = 16.67 mA/cm2, and electrode distance = 2 cm, 95% of dye was removed after 60 minutes in the electro-activated persulfate process; while the modified electro-activated persulfate process achieved 95% dye removal after only 40 minutes under the same conditions. This system was able to remove 90% of dye after 60 minutes at a higher concentration (300 mg/L). Also, the modified electro-activated persulfate process obtained the removal of 80% of COD, and 54% of TOC after 180 minutes in the mentioned conditions, for the dye concentration of 300 mg/L.

scholarly journals Performance Comparison of Fe2+ Activated Persulfate and Electro-Persulfate Process in Acid Blue 25 Removal from Aqueous Solution Operating: Conditions and Reaction Velocity

2020 ◽  
Author(s):  
Zeinab Ghorbani
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Ferrous Sulfate ◽  
Electrochemical Process ◽  
Sodium Persulfate ◽  
Sulfate Concentration ◽  
Reaction Velocity ◽  
Acid Blue 25 ◽  
Acid Blue ◽  
Activated Persulfate

The purpose of this study was to compare the performance of Fe2+ activated persulfate and electro-persulfate process in Acid Blue 25 removal from aqueous solution. For this reason, the effects of different parameters including pH, dye, sodium persulfate and ferrous sulfate concentrations were investigated. The removal efficiency of 92% at the time of 60 min was obtained at pH= 3, dye concentration= 50 mg/L, sodium persulfate concentration= 500 mg/L and Fe (II) sulfate concentration= 100 mg/L for Fe2+ activated persulfate system and the removal efficiency of 95% at pH= 5, dye concentration = 200 mg/L, sodium persulfate concentration = 500 mg/L and ferrous sulfate concentration = 100 mg/L for electro-persulfate system by means of graphite materials as the neutral electrodes. COD removal efficiency in Fe2+ activated persulfate and electro-persulfate in the mentioned conditions were 90% and 89% in 180 minutes, respectively. Moreover, the result of process kinetics showed that using electrochemical process improved the reaction velocity from 0.0016 to 0.0487 mg/L/min. The comparison between these two-process showed that using electrochemical process improved dye removal efficiency by 4 times.

scholarly journals Acid Blue 25 Removal by using Fe2+ Activated Persulfate

2020 ◽  
Author(s):  
Zeinab Ghorbani
Keyword(s):  
Textile Industry ◽  
Dye Removal ◽  
Aqueous Media ◽  
Industrial Effluents ◽  
Sodium Persulfate ◽  
Optimal Conditions ◽  
Initial Concentration ◽  
The One ◽  
Acid Blue ◽  
Activated Persulfate

Dyes are one of the most important contaminants in the textile industry wastewater, which are often carcinogenic, and biodegradable. So their removal from the effluent is environmentally important. This study aimed to investigate the efficiency of sodium persulfate in removing dye from aqueous media. In order to optimize each parameter, the one-factor-at-a-time method was used. In this experimental study, the effect of three main parameters including pH, sodium persulfate concentration, and iron (II) concentration on dye removal from aqueous solution was investigated. According to the results obtained from the experiments, the optimal removal efficiency of 92% was obtained in 60 minutes and under optimal conditions of pH=3, the initial concentration of sodium persulfate=500 mg / L, and the initial concentration of iron (II) sulfate=100 mg / L. According to the results, the use of sodium persulfate salt activated with Fe2+ can be an efficient process for dye removal from industrial effluents.

scholarly journals Acid Blue 25 Removal by using Electro-Persulfate Process

2020 ◽  
Author(s):  
Zeinab Ghorbani
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Salt Concentration ◽  
Dye Removal ◽  
Industrial Effluents ◽  
Sodium Persulfate ◽  
Initial Concentration ◽  
Acid Blue 25 ◽  
Sulfate Process ◽  
Acid Blue

This study aimed to investigate the efficiency of the electro-persulfate process in removing acid blue 25 from aqueous solution. In order to optimize the parameters, the OFAT method was used, and the effect of three main parameters, including pH, sodium persulfate salt concentration, and current intensity was investigated. According to the results, the optimal removal efficiency of 94% in 60 minutes was obtained under conditions of pH=5, the initial concentration of sodium persulfate=250 mg / L, and the current=500 mA. According to the results of this study, the electro-persulfate process sulfate process can be an efficient process for dye removal from industrial effluents.

scholarly journals Performance evaluation of photolytic and electrochemical oxidation processes for enhanced degradation of food dyes laden wastewater

2020 ◽  
Vol 81 (5) ◽  
pp. 971-984 ◽  
Author(s):  
Seema Sartaj ◽  
Nisar Ali ◽  
Adnan Khan ◽  
Sumeet Malik ◽  
Muhammad Bilal ◽  
...  
Keyword(s):  
Current Density ◽  
Hypochlorous Acid ◽  
Minimum Energy ◽  
Ruthenium Oxide ◽  
Electrochemical Process ◽  
Chlorine Molecule ◽  
Allura Red ◽  
Minimum Energy Consumption ◽  
Red Dye ◽  
A Current

Abstract Wastewater containing dyes is considered as the top-priority pollutant when discharged into the environment. Herein, we report for the applicability of 254 nm ultraviolet light and electrochemical process using a titanium ruthenium oxide anode for the degradation of Allura red and erythrosine dyes. During the photolytic process, 95% of Allura red dye (50 ppm) was removed after 1 h at pH 12 and 35 °C, whereas 90% color removal of erythrosine dye (50 ppm) was achieved after 6 h of treatment at pH 6.0 and 30 °C. On the other hand, 99.60% of Allura red dye (200 ppm) was removed within 5 min by the electrochemical process applying a current density (5 mA cm−2) at pH 5.0 and 0.1 mol L−1 sodium chloride (NaCl) electrolytic medium. Similarly, 99.61% of erythrosine dye (50 ppm) degradation was achieved after 10 min at a current density of 8 mA cm−2, pH 6.0, and 0.1 mol L−1 of NaCl electrolyte. The minimum energy consumption value for Allura red and erythrosine dyes (0.196 and 0.941 kWh m–3, respectively) was calculated at optimum current densities of 5 and 8 mA cm−2. The results demonstrated that the electrochemical process is more efficient at removing dyes in a shorter time than the photolytic process since it generates powerful oxidants like the chlorine molecule, hypochlorous acid, and hypochlorite on the surface of the anode and initiates a chain reaction to oxidize the dyes molecules.

High Reversible Capacity of Nitrogen-Doped Graphene as an Anode Material for Lithium-Ion Batteries

2014 ◽  
Vol 1070-1072 ◽  
pp. 459-464
Author(s):  
Chang Jing Fu ◽  
Shuang Li ◽  
Qian Wang
Keyword(s):  
Graphene Oxide ◽  
Electron Microscope ◽  
Lithium Ion Batteries ◽  
Current Density ◽  
Lithium Ion ◽  
X Ray ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
A Current

Nitrogen-doped graphene (N-rGO) was synthesized in the process of preparation of reduced graphene oxide from the expanded graphite through the improved Hummers’ method. The morphology, structure and composition of nitrogen-doped graphene oxide (GO) and N-rGO were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The nitrogen content of N-rGO was approximately 5 at.%. The electrochemical performances of N-rGO as anode materials for lithium-ion batteries were evaluated in coin-type cells versus metallic lithium. Results showed that the obtained N-rGO exhibited a higher reversible specific capacity of 519 mAh g-1 at a current density of 100 mA⋅g-1 and 207.5 mAh⋅g-1 at a current density of 2000 mA⋅g-1. The excellent cycling stability and high-rate capability of N-rGO as anodes of lithium-ion battery were attributed to the large number of surface defects caused by the nitrogen doping, which facilitates the fast transport of Li-ion and electron on the interface of electrolyte/electrode.

A nanocrystalline structured NiO/MnO2@nitrogen-doped graphene oxide hybrid nanocomposite for high performance supercapacitors

2017 ◽  
Vol 41 (24) ◽  
pp. 15517-15527 ◽  
Author(s):  
Sivalingam Ramesh ◽  
K. Karuppasamy ◽  
Sabeur Msolli ◽  
Hyun-Seok Kim ◽  
Heung Soo Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Current Density ◽  
High Performance ◽  
Composite Electrode ◽  
Cyclic Stability ◽  
Hybrid Nanocomposite ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
A Current

A nanocrystalline NiO@MnO2/NGO hybrid composite electrode showed specific capacitance of 1490 Fg−1 at a current density of 0.5 Ag−1 and retains 98% up to 2000 cycles indicating its good cyclic stability.

scholarly journals Comparative Electrocatalytic Oxygen Evolution Reaction Studies of Spinel NiFe2O4 and Its Nanocarbon Hybrids

2021 ◽  
Author(s):  
Pratik V. Shinde ◽  
Rutuparna Samal ◽  
Chandra Sekhar Rout
Keyword(s):  
Graphene Oxide ◽  
Oxygen Evolution ◽  
Current Density ◽  
Transition Metal Oxides ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
High Performance ◽  
High Surface ◽  
High Surface Area ◽  
A Current

AbstractElectrocatalytic oxygen evolution reaction (OER) is one of the crucial reactions for converting renewable electricity into chemical fuel in the form of hydrogen. To date, there is still a challenge in designing ideal cost-effective OER catalysts with excellent activity and robust durability. The hybridization of transition metal oxides and carbonaceous materials is one of the most effective and promising strategies to develop high-performance electrocatalysts. Herein, this work synthesized hybrids of NiFe2O4 spinel materials with two-dimensional (2D) graphene oxide and one-dimensional (1D) carbon nanotubes using a facile solvothermal approach. Electrocatalytic activities of NiFe2O4 with 2D graphene oxide toward OER were realized to be superior even to the 1D carbon nanotube-based electrocatalyst in terms of overpotential to reach a current density of 10 mA/cm2 as well as Tafel slopes. The NiFe2O4 with 2D graphene oxide hybrid exhibits good stability with an overpotential of 327 mV at a current density of 10 mA/cm2 and a Tafel slope of 103 mV/dec. The high performance of NiFe2O4 with 2D graphene oxide is mainly attributed to its unique morphology, more exposed active sites, and a porous structure with a high surface area. Thus, an approach of hybridizing a metal oxide with a carbonaceous material offers an attractive platform for developing an efficient electrocatalyst for water electrochemistry applications.

Nanostructured Graphenes and Metal Oxides for Fuel Cell and Battery Applications

2013 ◽  
Vol 705 ◽  
pp. 126-131 ◽  
Author(s):  
Zhe Fei Li ◽  
Jian Xie ◽  
Lia Stanciu ◽  
Yang Ren
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Fuel Cell ◽  
Metal Oxides ◽  
Surface Area ◽  
Current Density ◽  
Graphene Sheets ◽  
Nanoparticle Composites ◽  
A Current

Graphene/spacer nanoparticle composites were prepared by reducing graphene oxide with hydrazine in the presence of different contents of polyaniline nanoparticles. In-situ cryo-TEM image of GO-spacer solution shows that spacer nanoparticles are anchored on GO sheets. During the reduction, as-adsorbed spacer nanoparticles were sandwiched between layers of graphene. These spacer nanoparticles act as spacers to create gaps between neighboring graphene sheets, resulting in higher surface area. Graphene/spacer nanocomposites exhibited highest specific surface area of 1500 m2/g. Utilizing this composite material, a supercapacitor with specific capacitance of 267 F/g at a current density of 0.1 A/g was achieved.

One-pot synthesis of thin Co(OH)2 nanosheets on graphene and their high activity as a capacitor electrode

RSC Advances ◽  
2014 ◽  
Vol 4 (93) ◽  
pp. 51619-51623 ◽  
Author(s):  
Gyoung Hwa Jeong ◽  
Hae-Min Lee ◽  
Heewoong Lee ◽  
Chang-Koo Kim ◽  
Yuanzhe Piao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Activity ◽  
Specific Capacitance ◽  
Current Density ◽  
One Pot ◽  
Graphene Composite ◽  
One Pot Synthesis ◽  
A Current

We synthesized Co(OH)2/graphene composites from graphite without a graphene oxide (GO) step. The Co(OH)2/graphene composite exhibited a specific capacitance of 960 F g−1 at a current density of 10 A g−1.

One-pot hydrothermal synthesis of polyaniline nanofibers/reduced graphene oxide nanocomposites and their supercapacitive properties

2019 ◽  
Vol 31 (9-10) ◽  
pp. 1238-1247 ◽  
Author(s):  
Shanxin Xiong ◽  
Yuancheng Wang ◽  
Jia Chu ◽  
Xiaoqin Wang ◽  
Runlan Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
Current Density ◽  
Electrochemical Performances ◽  
One Pot ◽  
Raman Analysis ◽  
Polyaniline Nanofibers ◽  
Reduced Graphene ◽  
A Current ◽  
Charge Discharge

In this article, polyaniline nanofibers/reduced graphene oxide (PANI-NFs/rGO) nanocomposites were prepared by a one-pot hydrothermal method. Under the condition of high temperature and high pressure, graphene oxide (GO) was reduced to rGO and aniline was in-situ polymerized to form PANI-NFs using ammonium persulfate as oxidant. The morphologies and structures of PANI-NFs/rGO nanocomposites were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), and Raman analysis. The results show that PANI-NFs uniformly grow on the surfaces of rGO sheets, which can act as spacers to prevent the aggregation of rGO. Combining with FTIR and Raman analysis, it can be concluded that PANI-NFs/rGO nanocomposites are successfully prepared. The electrochemical performances of PANI-NFs/rGO nanocomposites were tested by cyclic voltammetry and galvanostatic charge–discharge. The PANI-NFs/rGO nanocomposites exhibit superior electrochemical performances compared to the PANI-NFs. With 10 wt% of GO loaded, the PANI-NFs/rGO nanocomposite exhibits highest specific capacitance of 942 F g−1 at a current density of 1 A g−1. The PANI-NFs/rGO nanocomposites also demonstrate good rate capacity and high cycling stability under the high discharging current density (10 A g−1), the specific capacitance can still reach to 680 F g−1. After 1000 charge–discharge cycling at a current density of 5 A g−1, 78% of specific capacitance can be retained. The enhanced capacitive performances can be attributed to the facile electron conduction pathway brought by the even distribution of highly conductive rGO nanosheets.

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