Structural changes and electrochemical properties of lacquer wood activated carbon prepared by phosphoric acid-chemical activation for supercapacitor applications

2021 ◽  
Author(s):  
Sheng-Chun Hu ◽  
Jie Cheng ◽  
Wu-Ping Wang ◽  
Guo-Tao Sun ◽  
Li-Le Hu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Phosphoric Acid ◽  
Electrochemical Properties ◽  
Structural Changes ◽  
Chemical Activation ◽  
Supercapacitor Applications

Activated carbon from molasses efficiency for Cr(VI), Pb(II) and Cu(II) adsorption: A mechanistic study

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Activated Carbon ◽  
Phosphoric Acid ◽  
Sugar Industry ◽  
Chemical Activation ◽  
High Surface ◽  
High Surface Area ◽  
Mechanistic Study ◽  
Acid Mixture ◽  
Maximum Adsorption Capacity ◽  
Good Potential

Activated carbon was prepared from molasses, which are natural precursors of vegetable origin resulting from the sugar industry. A simple elaboration process, based on chemical activation with phosphoric acid, was proposed. The final product, prepared by activation of molasses/phosphoric acid mixture in air at 500°C, presented high surface area (more than 1400 m2/g) and important maximum adsorption capacity for methylene blue (625 mg/g) and iodine (1660 mg/g). The activated carbon (MP2(500)) showed a good potential for the adsorption of Cr(VI), Cu(II) and Pb(II) from aqueous solutions. The affinity for the three ions was observed in the following order Cu2+ Cr6+ Pb2+. The process is governed by monolayer adsorption following the Langmuir model, with a correlation coefficient close to unity.

Physical and Chemical Activation Effect on Activated Carbon Prepared from Local Pineapple Waste

2014 ◽  
Vol 699 ◽  
pp. 87-92 ◽  
Author(s):  
Abdul Rahim Yacob ◽  
Adlina Azmi ◽  
Mohd Khairul Asyraf Amat Mustajab
Keyword(s):  
Activated Carbon ◽  
Phosphoric Acid ◽  
Surface Area ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Bet Surface Area ◽  
Activation Effect ◽  
Pineapple Waste ◽  
Pineapple Peel ◽  
Physical And Chemical

The characteristics and quality of activated carbons prepared depending on the chemical and physical properties of the starting materials and the activation method used. In this study, activated carbon prepared using pineapple waste. Three parts of pineapple waste which comprises of peel, crown and leaf were studied. For comparison activated carbon were prepared by both physical and chemical activation respectively. Three types of chemicals were used, phosphoric acid (H3PO4), sulphuric acid (H2SO4), and potassium hydroxide (KOH). The preparation includes carbonization at 200°C and activation at the 400°C using muffle furnace. The chemical characterization of the activated carbon was carried out using Thermogravimetric analysis (TGA), Nitrogen gas adsorption analysis and Fourier transform infrared (FTIR). The highest BET surface area was achieved when the pineapple peel soaked in 20% phosphoric acid with a surface area of 1115 m2g-1. FTIR analysis indicates that the reacted pineapple waste successfully converted into activated carbons.

scholarly journals Activated Carbon from Corncobs Doped with RuO2 as Biobased Electrode Material

2021 ◽  
Vol 2 (3) ◽  
pp. 324-343
Author(s):  
Viola Hoffmann ◽  
Catalina Rodriguez Correa ◽  
Saskia Sachs ◽  
Andrea del Pilar Sandoval-Rojas ◽  
Mo Qiao ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Electrochemical Properties ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Xrd Analysis ◽  
High Specific Surface Area ◽  
Carbon Surface ◽  
Physico Chemical ◽  
Electrochemical Double Layer Capacitors ◽  
Electrochemical Double Layer

Bio-based activated carbons with very high specific surface area of >3.000 m² g−1 (based on CO2 adsorption isotherms) and a high proportion of micropores (87% of total SSA) are produced by corncobs via pyrolysis and chemical activation with KOH. The activated carbon is further doped with different proportions of the highly pseudocapacitive transition metal oxide RuO2 to obtain enhanced electrochemical properties and tune the materials for the application in electrochemical double-layer capacitors (EDLC) (supercapacitors). The activated carbon and composites are extensively studied regarding their physico-chemical and electrochemical properties. The results show that the composite containing 40 wt.% RuO2 has an electric conductivity of 408 S m−1 and a specific capacitance of 360 Fg−1. SEM-EDX, XPS, and XRD analysis confirm the homogenous distribution of partly crystalline RuO2 particles on the carbon surface, which leads to a biobased composite material with enhanced electrochemical properties.

HEMP-derived activated carbon fibers by chemical activation with phosphoric acid

Fuel ◽  
2009 ◽  
Vol 88 (1) ◽  
pp. 19-26 ◽  
Author(s):  
J.M. Rosas ◽  
J. Bedia ◽  
J. Rodríguez-Mirasol ◽  
T. Cordero
Keyword(s):  
Activated Carbon ◽  
Phosphoric Acid ◽  
Carbon Fibers ◽  
Chemical Activation ◽  
Activated Carbon Fibers

scholarly journals Optimization of Mesoporous Activated Carbon from Coconut Shells by Chemical Activation with Phosphoric Acid

BioResources ◽  
2013 ◽  
Vol 8 (4) ◽  
Author(s):  
Xinying Wang ◽  
Danxi Li ◽  
Wei Li ◽  
Jinhui Peng ◽  
Hongying Xia ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Phosphoric Acid ◽  
Chemical Activation ◽  
Mesoporous Activated Carbon ◽  
Coconut Shells

scholarly journals Preparation of Activated Carbon from Tea Waste by NaOH Activation as A Supercapacitor Material

2020 ◽  
Vol 9 (2) ◽  
pp. 42-47 ◽  
Author(s):  
Eldya Mossfika ◽  
Syukri Syukri ◽  
Hermansyah Aziz
Keyword(s):  
Activated Carbon ◽  
Electrochemical Properties ◽  
Surface Area ◽  
Large Scale ◽  
Chemical Activation ◽  
Activation Process ◽  
Carbon Electrode ◽  
Rate Of Increase ◽  
Scan Rate ◽  
Tea Waste

Karbon aktif dari ampas teh telah disintesis dan telah diuji sebagai elektroda superkapasitor. Pembuatan karbon aktif berdasarkan variasi rasio massa karbon dan aktivator NaOH yaitu 1:4, 1;5 % b/b yang diberi kode AC-4 dan AC-5. Sintesis elektroda karbon aktif di awali dengan proses pra-karbonisasi dan dilanjutkan dengan proses aktivasi kimia. Sampel di karbonisasi pada suhu 800 oC dengan laju kenaikan 50C/menit dalam kondisi gas inert (N2). Karbon aktif ampas teh dikarakterisasi dengan SAA (Surface Area Assessment). Sifat elektrokimia dan kinerja elektroda karbon aktif yang disintesis diukur menggunakan metode voltametri siklik dalam larutan elektrolit H2SO4 1M. Elektroda karbon aktif menunjukkan kapasitansi spesifik tertinggi pada sampel AC-4 yaitu 67 F/g dengan scan rate 1 mV/s dan luas permukaan spesifik 473 m2/g. Mengingat sifat elekrokimia yang menarik tersebut, dan banyaknya ampas teh yang mudah ditemukan disekitar kita maka elektroda karbon aktif ini berpotensi untuk bahan pembuatan superkapasitor elektrokimia skala besar di masa depan.Activated carbon from tea waste has been synthesized and has been tested as a supercapacitor electrode. Making activated carbon based on variations in the ratio of carbon mass and activator NaOH that is 1: 4, 1; 5%wt coded AC-4 and AC-5. Synthesis of activated carbon electrodes begins with the pre-carbonization process and is followed by a chemical activation process. Samples are carbonized at 800 oC with a rate of increase of 50C / min under inert gas (N2) conditions. Activated carbon of tea waste is characterized by SAA (Surface Area Assessment). The electrochemical properties and performance of the activated carbon electrode were measured using the cyclic voltammetry method in a H2SO41 M electrolyte solution. The activated carbon electrode showed the highspecific capacitance in the AC-4 sample of 67 F / g with a scan rate of 1 mV / s and surface area Specifically 473 m2 / g. Considering these interesting electrochemical properties, and the abundance of tea dregs that are easily found around us, this activated carbon electrode has the potential to be a material for making large-scale electrochemical supercapacitors in the future.Keywords:Limbah ampas teh, Aktivator, Kapasitansi spesifik, NaOH, Supekapasitor

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