scholarly journals Adsorption–desorption characteristics of methyl ethyl ketone with modified activated carbon and inhibition of 2,3-butanediol production

2015 ◽  
Vol 65 (11) ◽  
pp. 1317-1326 ◽  
Author(s):  
Kai Chun Nien ◽  
Feng Tang Chang ◽  
Moo Been Chang
Keyword(s):  
Activated Carbon ◽  
Methyl Ethyl Ketone ◽  
Methyl Ethyl ◽  
Modified Activated Carbon ◽  
Adsorption Desorption

scholarly journals Effect of Sodium Benzenesulfonate on SO42− Removal from Water by Polypyrrole-Modified Activated Carbon

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Feng Zhang ◽  
Dong-Sheng Wang ◽  
Fan Yang ◽  
Tian-Yu Li ◽  
Hong-Yan Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Granular Activated Carbon ◽  
Langmuir Model ◽  
Sulfate Adsorption ◽  
Modified Activated Carbon ◽  
Pseudo Second Order ◽  
Acidic Conditions ◽  
Adsorption Desorption ◽  
Desorption Cycle

Sodium benzenesulfonate was doped into polypyrrole-modified granular activated carbon (pyrrole-FeCl3·(6H2O)-sodium benzenesulfonate-granular activated carbon; PFB-GAC) with the goal of improving the modified GAC’s ability to adsorb sulfate from aqueous solutions. At a GAC dosage of 2.5 g and a pyrrole concentration of 1 mol L−1, the adsorption capacity of PFB-GAC prepared using a pyrrole:FeCl3·(6H2O):sodium benzenesulfonate ratio of 1000 : 1500 : 1 reached 23.05 mg g−1, which was eight times higher than that for GAC and two times higher than that for polypyrrole-modified GAC without sodium benzenesulfonate. Adsorption was favored under acidic conditions and high initial sulfate concentrations. Doping with sodium benzenesulfonate facilitated polymerization to give polypyrrole. Sodium benzenesulfonate introduced more imino groups to the polypyrrole coating, and the N+ sites improved ion exchange of Cl− and SO42− and increased the adsorption capacity of sulfate. Adsorption to the PFB-GAC followed pseudo-second-order kinetics. The adsorption isotherm conformed to the Langmuir model, and adsorption was exothermic. Regeneration using a weak alkali (NH3·H2O), which released OH− slowly, caused less damage to the polypyrrole than using a strong alkali (NaOH) as the regeneration reagent. NH3·H2O at a concentration of 12 mol L−1 (with the same OH− concentration as 2 mol L−1 NaOH) released 85% of the sorbed sulfate in the first adsorption-desorption cycle, and the adsorption capacity remained >6 mg g−1after five adsorption-desorption cycles.

scholarly journals Adsorption of gold from thiosulfate solutions with chemically modified activated carbon

2017 ◽  
Vol 36 (1-2) ◽  
pp. 408-428 ◽  
Author(s):  
Hong Yu ◽  
Futing Zi ◽  
Xianzhi Hu ◽  
Yanhe Nie ◽  
Yunlong Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Photoelectron Spectroscopy ◽  
Freundlich Isotherm ◽  
Modified Activated Carbon ◽  
New Approach ◽  
Complex Adsorption ◽  
Adsorption Kinetics And Isotherm ◽  
Thiosulfate Leaching ◽  
Adsorption Desorption

Adsorption of the gold–thiosulfate complex ion ([Formula: see text]) on silver ferrocyanide (AgFC)-impregnated activated carbon in aqueous solution has been studied in order to find an effectual adsorbent for the thiosulfate extracting gold from ores. This study was performed using AgFC-impregnated activated carbon (AC-Ag-R-FC: AC: activated carbon, Ag: silver nitrate, R: heating, FC: potassium ferrocyanide) and an artificial aqueous solution of [Formula: see text]. Gold–thiosulfate complex adsorption kinetics and isotherm studies were carried out at pH = 9.0 on modified materials. It has been also found that the adsorption fits the intraparticle diffusion and Freundlich isotherm well. In order to understand the adsorption mechanism, raw and modified materials were characterized by N2 adsorption–desorption measurements at 77 K, scanning electron microscopy and X-ray photoelectron spectroscopy. The maximum adsorption capability of [Formula: see text]on AC-Ag-R-FC is 3.55 kgt−1. Clearly, the extraordinary adsorption capacity of AC for [Formula: see text] offers a new approach to address challenging gold–thiosulfate complex separation and could promote the future development of thiosulfate leaching gold process.

scholarly journals Research on super capacitance properties of modified activated carbon in sodium sulfate electrolyte

2018 ◽  
Vol 238 ◽  
pp. 01003
Author(s):  
Lin Wang ◽  
Chun Wang ◽  
Ying Liu ◽  
Heng Yan ◽  
Xiangbo Zhang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Functional Groups ◽  
Carbon Material ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Electrode System ◽  
Sulfate Electrolyte ◽  
Modified Activated Carbon ◽  
Before And After ◽  
Adsorption Desorption

In order to improve the specific capacity and energy density of activated carbon electrode materials activated carbon was modified by surface treatment using hydrogen peroxide. The modified carbons were characterized the changes of pore structure and functional groups before and after modification by N2 adsorption-desorption isotherms and FTIR spectroscopy. The three electrode system was assembled with modified activated carbon as electrode materials and Na2SO4 as the electrolyte. The influence of surface modification on the performance of EDLCs was studied by galvanostatic charge-discharge, cyclic voltammetry, and alternating current impedance. The results show that the surface chemistry of the modified activated carbon material has changed, the specific surface area has changed and the pore size has not changed much with the introduction of new oxygen-containing functional groups. The specific capacity of the activated carbon material modified by 5h is 75F/g, which is 86.1% higher than that before the modification. It can be seen that the change of functional group after the modification of activated carbon can help to increase the specific capacity.

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