scholarly journals Hybrid Deep Eutectic Solvent of LiTFSI-Ethylene Glycol Organic Electrolyte for Activated Carbon-Based Supercapacitors

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Kieu T. Tran ◽  
Tuyen T. T. Truong ◽  
Hoang V. Nguyen ◽  
Quan D. Nguyen ◽  
Quan Phung ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Ethylene Glycol ◽  
Organic Solvents ◽  
High Performance ◽  
Ethylene Carbonate ◽  
Research Work ◽  
Deep Eutectic Solvent ◽  
Scanning Rate ◽  
Lower Viscosity ◽  
Rate Capacity

This research work demonstrates a novel hybrid electrolyte based on a deep eutectic solvent (DES) combined with organic solvents for high-performance supercapacitors. DES was formed between ethylene glycol (EG) and lithium bis((trifluoromethyl)sulfonyl) imide (LiTFSI) and diluted by ethylene carbonate (EC) or acetonitrile (AN) with different amounts (10–50% wt.). Such a combination gives superior properties for hybrid electrolytes compared to pure DESs and reduces the volatility of mixed organic solvents. Regarding the electrochemical properties, DES-AN mixtures exhibited a better performance under high applied voltage and more reversible behavior than DES-EC ones, which suffered from the increasing distance in the electrical double layer. DES 1 : 4 + 20% wt. AN exhibited favorable electrolyte properties such as high ionic conductivity (3.1 mS·cm−1 at 30oC), relatively lower viscosity (14.28 mPa s at 30oC, approximately 2 times lower thanDES pure), and quite large electrochemical stability window up to 3.4 V (at 20–30% wt. AN) compared to the baseline electrolyte (LiTFSI/TBABF4 in AN). With these interesting properties, selected hybrid electrolyte (DES 1 : 4 + 20% wt. AN) tested in the symmetric capacitor using the activated carbon offered decent capacitance (15 F·g−1 at 3.4 V with a scanning rate of 1 A·g−1 and remains around 95% after 100 cycles) and good charge-discharge durability (>80% retention after 2000 cycles), especially the EDLC with DES 1 : 4 + 20% wt. AN shows good rate capacity (13.2 F·g−1 at 2 A·g−1, remaining 6 F·g−1 at 10 A·g−1).

scholarly journals THE INVESTIGATION OF CONDITIONS OF API FROM GROUP OF CALCIUM CHANNEL BLOCKERS EXTRACTION BY ORGANIC SOLVENTS BY USING HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY AS ASSAY METHOD

2017 ◽  
Vol 10 (10) ◽  
pp. 354
Author(s):  
Olgya Polyauk ◽  
Liliya Logoyda
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Calcium Channel ◽  
Organic Solvents ◽  
Calcium Channel Blockers ◽  
High Performance ◽  
Research Work ◽  
Assay Method ◽  
Channel Blockers ◽  
Water Solutions

  Objective: The objective of this research was to select the optimal conditions for extraction of API from calcium channel blockers (amlodipine, nifedipine, and verapamil) by organic solvents from water solutions in dependence on pH solutions.Methods: The chromatographic analysis of amlodipine, nifedipine, and verapamil performed on liquid chromatography Agilent 1200.Results: The quantitative determination of API from calcium channel blockers (amlodipine, nifedipine, and verapamil) by high-performance liquid chromatography - method has been conducted. As a result of studies, we have found that the optimal extragent is chloroform, which is extracted at pH 7-82.1% of amlodipine, pH 5-76.2% of nifedipine, and pH 8-95.1% verapamil hydrochloride. API from calcium channel blockers (amlodipine, nifedipine, and verapamil) least extracted with hexane at pH 2.0, so these conditions may be cleaned extract from coextractives impurities.Conclusion: The results obtained in this research work clearly indicated that the extraction of API from calcium channel blockers (amlodipine, nifedipine, and verapamil) by organic solvents from water solutions in dependence on pH solutions has been conducted.

Use of activated carbon to remove undesirable residual amylase from refinery streams

2017 ◽  
pp. 96-103 ◽  
Author(s):  
Gillian Eggleston ◽  
Isabel Lima ◽  
Emmanuel Sarir ◽  
Jack Thompson ◽  
John Zatlokovicz ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Temperature ◽  
High Performance ◽  
Activated Carbons ◽  
Amylase Activity ◽  
Sugar Industry ◽  
End User ◽  
Customer Complaints ◽  
Carry Over ◽  
Very High

In recent years, there has been increased world-wide concern over residual (carry-over) activity of mostly high temperature (HT) and very high temperature (VHT) stable amylases in white, refined sugars from refineries to various food and end-user industries. HT and VHT stable amylases were developed for much larger markets than the sugar industry with harsher processing conditions. There is an urgent need in the sugar industry to be able to remove or inactivate residual, active amylases either in factory or refinery streams or both. A survey of refineries that used amylase and had activated carbon systems for decolorizing, revealed they did not have any customer complaints for residual amylase. The use of high performance activated carbons to remove residual amylase activity was investigated using a Phadebas® method created for the sugar industry to measure residual amylase in syrups. Ability to remove residual amylase protein was dependent on the surface area of the powdered activated carbons as well as mixing (retention) time. The activated carbon also had the additional benefit of removing color and insoluble starch.

Scalable combustion synthesis of graphene-welded activated carbon for high-performance supercapacitors

2021 ◽  
Vol 414 ◽  
pp. 128781 ◽  
Author(s):  
Chen Li ◽  
Xiong Zhang ◽  
Zhisheng Lv ◽  
Kai Wang ◽  
Xianzhong Sun ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Combustion Synthesis ◽  
High Performance

High Performance Hybrid Capacitive Deionization with Ag-coated Activated Carbon Electrode

2021 ◽  
Author(s):  
Hongsik Yoon ◽  
Jiho Lee ◽  
Taijin Min ◽  
Gunhee Lee ◽  
Minsub Oh
Keyword(s):  
Activated Carbon ◽  
Water Treatment ◽  
Industrial Application ◽  
High Performance ◽  
Treatment System ◽  
Carbon Electrode ◽  
Capacitive Deionization ◽  
Water Treatment System

Capacitive deionization (CDI) has been highlighted as a promising electrochemical water treatment system. However, the low deionization capacity of CDI electrodes has been a major limitation for its industrial application,...

scholarly journals Preparation of High-Performance Activated Carbon from Coffee Grounds after Extraction of Bio-Oil

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 257
Author(s):  
Jie Ren ◽  
Nanwei Chen ◽  
Li Wan ◽  
Guojian Li ◽  
Tao Chen ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Performance ◽  
Average Pore Size ◽  
Total Pore Volume ◽  
Micropore Volume ◽  
Bet Surface Area ◽  
Average Pore ◽  
Activation Temperature ◽  
Coffee Grounds ◽  
Bio Oil

In this study, a new method for economical utilization of coffee grounds was developed and tested. The resulting materials were characterized by proximate and elemental analyses, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and N2 adsorption–desorption at 77 K. The experimental data show bio-oil yields reaching 42.3%. The optimal activated carbon was obtained under vacuum pyrolysis self-activation at an operating temperature of 450 °C, an activation temperature of 600 °C, an activation time of 30 min, and an impregnation ratio with phosphoric acid of 150 wt.%. Under these conditions, the yield of activated carbon reached 27.4% with a BET surface area of 1420 m2·g−1, an average pore size of 2.1 nm, a total pore volume of 0.747 cm3·g−1, and a t-Plot micropore volume of 0.428 cm3·g−1. In addition, the surface of activated carbon looked relatively rough, containing mesopores and micropores with large amounts of corrosion pits.

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