The reconstruction of char surface by oxidized quantum-size carbon dots under the ultrasonic energy to prepare modified activated carbon materials as electrodes for supercapacitors

Bicomponent manganese and rhenium modified activated carbon materials, prepared by different methods, are studied and compared with the corresponding monocomponent materials as catalysts in methanol decomposition to CO and hydrogen. The best catalytic activity and stability is observed for the sample obtained by simultaneous deposition of Mn and Re precursors. The complex character of the catalytic active centre, including manganese and rhenium irons in various oxidative states, is discussed. The determining role of the Mn(II) ions in the improvement of the catalytic properties is assumed.Key words: rhenium, manganese, activated carbon, methanol decomposition.

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Carbon nanomaterials for supercapacitors: two electrode scheme

MATEC Web of Conferences ◽

10.1051/matecconf/202134001035 ◽

2021 ◽

Vol 340 ◽

pp. 01035

Author(s):

Maxim V. Popov ◽

Alexander G. Bannov ◽

Stepan I. Yusin

Keyword(s):

Activated Carbon ◽

Carbon Nanofibers ◽

Carbon Nanomaterials ◽

Electrode Materials ◽

Carbon Materials ◽

Expanded Graphite ◽

Thermally Expanded Graphite ◽

Rice Hulls ◽

Texture Characteristics ◽

Electrodes For Supercapacitors

In this paper, the electrochemical and texture characteristics of electrode materials made of a number of promising carbon materials for supercapacitors were considered. Carbon nanofibers, thermally expanded graphite, and activated carbon derived from rice hulls were used as electrodes for supercapacitors. The paper presents a technique of synthesis of these electrode materials. A comparison of the capacitive characteristics of the electrodes using two-electrode scheme was carried out.

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Synergistically boosting electrochemical performance of polypyrrole coated-activated carbon derived from carbon dots for high-performance supercapacitor

Chemical Communications ◽

10.1039/d1cc02823e ◽

2021 ◽

Author(s):

Lanxin Wang ◽

QingXin Zeng ◽

Qiuhong Chen ◽

Chang Ming Li ◽

Jiucun Chen

Keyword(s):

Activated Carbon ◽

Electrochemical Performance ◽

Hybrid Materials ◽

Carbon Dots ◽

High Performance ◽

Carbon Materials ◽

The Stability

The hybrid materials prepared by the controlled fumigation polymerization of pyrrole on the surface of activated carbon derived from carbon dots combined the stability of carbon materials, the wettability of...

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Preparing Modified Activated Carbon from Cassia Fistula Seed with HNO3 for Zinc Removal in Wastewater

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.885.85 ◽

2021 ◽

Vol 885 ◽

pp. 85-93

Author(s):

Dao Minh Trung ◽

Tran Le Luu

Keyword(s):

Heavy Metal ◽

Activated Carbon ◽

Processing Time ◽

Carbon Materials ◽

Metal Removal ◽

Heavy Metal Removal ◽

Water Environment ◽

Cassia Fistula ◽

Modified Activated Carbon ◽

Zinc Removal

The economic’s development also bring urbanization and industrialization in many countries. However, many pollutants are also discharged into the environment, especially heavy metals (Zinc) seriously affects people's life and health as well as the water environment. This study reports on the preparation of activated carbon materials modified with HNO3 from Cassia Fistula seed for heavy metal removal. The results showed that zinc removal efficiencies were 65.06%; 72.19%; 75.64%; 78.57% corresponds to concentrations of 50, 30, 20, 10 ppm at optimal survey conditions pH 5, dosage of 0.3 g/50ml and 60 minutes processing time. The research results show that the activated carbon modified with HNO3 from Cassia Fistula seed is a promising absorption material for heavy metal removal in wastewater.

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