Preparation of activated carbons from rambutan (Nephelium lappaceum) peel by microwave-induced KOH activation for acid yellow 17 dye adsorption

2014 ◽  
Vol 250 ◽  
pp. 198-204 ◽  
Author(s):  
V.O. Njoku ◽  
K.Y. Foo ◽  
M. Asif ◽  
B.H. Hameed
Keyword(s):  
Activated Carbons ◽  
Dye Adsorption ◽  
Koh Activation ◽  
Nephelium Lappaceum

Effect of Activation Agents on COD Reduction Using Activated Carbon from Agricultural Residue

2020 ◽  
Vol 1010 ◽  
pp. 453-458
Author(s):  
Mohd Zazmiezi Mohd Alias ◽  
Rozidaini Mohd Ghazi ◽  
Nik Raihan Nik Yusoff ◽  
Mohd Hafiz Jamaludin
Keyword(s):  
Activated Carbon ◽  
Phosphoric Acid ◽  
Potassium Hydroxide ◽  
Activated Carbons ◽  
Oxygen Demand ◽  
Koh Activation ◽  
Ftir Analysis ◽  
Agricultural Residue ◽  
Cod Reduction ◽  
Activating Agent

This study investigated the effect of activating agent on activated carbon preparation and potential chemical oxygen demand (COD) reduction using activated carbons (AC) prepared. Zinc chloride, phosphoric acid and potassium hydroxide were utilized in impregnation of bamboo and rice husk. Result of SEM-EDX, FTIR as well as COD reduction were compared and discussed. The SEM displayed highest porosity in AC using KOH activation. FTIR analysis displayed obvious difference for each activation. AC using KOH activation obtained highest COD reduction.

Removal of Methylene Blue by Adsorption Process - A Comparative Study

2011 ◽  
Vol 699 ◽  
pp. 245-264 ◽  
Author(s):  
A. Xavier ◽  
J. Gandhi Rajan ◽  
D. Usha ◽  
R Sathya
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Adsorption Process ◽  
Activated Carbons ◽  
Low Cost ◽  
Kinetic Equations ◽  
Dye Adsorption ◽  
Industrial Wastes ◽  
Blue Dye ◽  
Molecular Formula

Methylene blue is a heterocyclic aromatic chemical compound with the molecular formula C16H18N3SCl. It has used in the biology and chemistry field. At room temperature, it appears as a solid, odourless dark green powder that yields blue solution when dissolved in water. As a part of removal of methylene blue dye from textile and leather industrial wastes, using activated carbon as adsorbents namely, commercial activated carbon (CAC), rose apple carbon (RAC), coconut shell carbon (CSC) and saw dust carbon (SDC). The percentage of Methylene blue adsorbed increases with decrease in initial concentration and particle size of adsorbent and increased with increase in contact time, temperature and dose of adsorbents. The pH is highly sensitive for dye adsorption process. The adsorption process followed first order kinetics and the adsorption data the modeled with Freundlich and Langmuir isotherms. The first kinetic equations like Natarajan Khalaf, Lagergren, Bhattacharya and Venkobhachar and intra particle diffusion were found to be applicable. A comparative account of the adsorption capacity of various carbons has been made. These activated carbons are alternative to commercial AC for the removal dyes in General and MB is particular. These results are reported highly efficient and effective and low cost adsorbent for the MB. The thermodynamics parameters are also studied and it obeys spontaneous process. The results are confirmed by before and after adsorption process with the help of the following instrumental techniques viz., FT-IR, UV-Visible Spectrophotometer and SEM photos.

scholarly journals Biomass based porous carbon for supercapacitor by hydrothermal assisted activating method

2021 ◽  
Vol 236 ◽  
pp. 01016
Author(s):  
Congcong Huang ◽  
Yunhui Dong ◽  
Xingjun Dong
Keyword(s):  
Electrode Material ◽  
High Performance ◽  
Activated Carbons ◽  
High Capacity ◽  
Rate Capability ◽  
High Energy ◽  
High Energy Density ◽  
Koh Activation ◽  
Electrochemical Performances ◽  
Adsorption Desorption

A facile route has been employed to synthesize a series of high performance activated carbons as the electrode material for supercapacitors. The structure of the carbons are characterized by N2 adsorption/desorption and FTIR spectroscopy. The electrochemical performances of the carbons as an electrode material were evaluated by cyclic voltammetry test and galvanostatic charge/discharge measurements. As a biomass derived carbon, KOH-1 exhibits high capacity, good rate capability and high energy density, indicating the promising application of hydrothermal combining with KOH activation method for biomass materials that used in supercapacitors

scholarly journals CHARACTERIZATION AND CIPROFLOXACIN ADSORPTION PROPERTIES OF ACTIVATED CARBONS PREPARED FROM VARIOUS AGRICULTURAL WASTES BY KOH ACTIVATION

2020 ◽  
Vol 54 (7-8) ◽  
pp. 811-819
Author(s):  
TO-UYEN T. DAO ◽  
◽  
HONG-THAM T. NGUYEN ◽  
DUYEN THI CAM NGUYEN ◽  
HANH T.N. LE ◽  
...  
Keyword(s):  
Activated Carbons ◽  
Adsorption Properties ◽  
Agricultural Wastes ◽  
Koh Activation

scholarly journals Preparation and characterization of activated carbons from biomass material – giant knotweed (Reynoutria sachalinensis)

2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Hanna Fałtynowicz ◽  
Jan Kaczmarczyk ◽  
Marek Kułażyński
Keyword(s):  
Carbon Dioxide ◽  
Surface Area ◽  
Activated Carbons ◽  
Bet Surface Area ◽  
Koh Activation ◽  
Volume Distribution ◽  
Porous Texture ◽  
Giant Knotweed ◽  
Reynoutria Sachalinensis ◽  
Area And Volume

AbstractActivated carbons from biomass material of giant knotweed Reynoutria sachalinensis (F. Schmidt ex Maxim.) Nakai were obtained. Use of this plant for manufacturing activated carbon has not been studied yet. Therefore, the first activated carbons of giant knotweed origin are described. Both physicochemical (by steam and CO2) and chemical (by KOH) activation methods were applied. Influences of temperature (500, 600, 700 and 800°C), burn-off [10, 25 and 50 wt. % (daf)] and KOH concentration on pores surface area and volume distribution of the obtained activated carbons were explored. Porosity of the elaborated sorbents was determined by benzene and carbon dioxide sorption measurements. Sorbents obtained by steam activation were micro- and mesoporous with surface area and volume of pores increasing with temperature and burn-off to V = 0.351 cm3 g-1 and S = 768 m2 g-1 at 800°C at 50% burn-off. Carbon dioxide activation resulted with notably microporous activated carbons with porous texture parameters also increasing with burn-off to V = 0.286 cm3 g-1 and S = 724 m2 g-1 at 50% burn-off. The highest BET surface area of 2541 m2 g-1 was achieved when chemical (KOH) activation was performed using KOH to char ratio 4:1.

An Effect of pH on Radiation Assisted Modification of Oxygen-Rich Activated Carbon by Urea

2021 ◽  
Vol 904 ◽  
pp. 407-412
Author(s):  
Threeraphat Chutimasakul ◽  
Tinutda Phonlam ◽  
Varistha Chobpattana ◽  
Pattra Lertsarawut ◽  
Wilasinee Kingkam ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Gas Adsorption ◽  
Activated Carbons ◽  
Organic Dyes ◽  
Dye Adsorption ◽  
Urea Solution ◽  
Activation Process ◽  
X Ray Diffraction ◽  
Green Technique ◽  
Adsorption Desorption

Activated carbons (ACs) are a versatile group of adsorbents for water pollution control, especially organic dyes. Harsh chemicals and high temperatures are required for the activation process of ACs, which becomes a significant concern due to their toxicity and harmful effects on human health and the environment. Gamma irradiation, an alternative green technique, is a promising strategy for pretreatment and escalates the nitrogen or oxygen functional group of ACs. The current study provides the modification of ACs by the gamma irradiation in the various pH (5-11) of urea solution. The modified ACs were characterized by scanning electron microscopy (SEM), nitrogen gas adsorption-desorption analysts (BET), temperature program desorption (TPD), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, and X-ray diffraction spectroscopy (XRD). The point of zero charges and dye adsorption capacities were determined. This finding demonstrates that the ACs can be modified by gamma irradiation at 25 kGy in the urea solution media. The degree of graphitization enhanced significantly at pH 11(AC-pH11). The oxygen-rich functional groups created by radiation assists could enhance the electrostatic attraction between acid gases or cationic dyes. AC-pH11 also was able to adsorb methylene blue (160.73 ± 1.70 mg/g) greater than methyl orange (127.57 ± 2.22 mg/g).

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