Absorption and mobility of molecules of water and organic substances in carbon adsorbents. Communication 2. Study of mobility of molecules of methanol on activated carbons differing in micropore structure, by means of pulse gradient NMR

1985 ◽  
Vol 34 (11) ◽  
pp. 2246-2250
Author(s):  
R. Sh. Vartapetyan ◽  
A. M. Voloshchuk ◽  
M. M. Dubinin ◽  
J. K�rger ◽  
H. Pfeifer
Keyword(s):  
Activated Carbons ◽  
Carbon Adsorbents ◽  
Organic Substances ◽  
Micropore Structure ◽  
Pulse Gradient ◽  
Mobility Of Molecules

scholarly journals Evaluation of Porous Carbon Adsorbents Made from Rice Husks for Virus Removal in Water

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1280
Author(s):  
Vu Duc Canh ◽  
Seiichiro Tabata ◽  
Shun Yamanoi ◽  
Yoichi Onaka ◽  
Toshiyuki Yokoi ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Activated Carbons ◽  
Carbon Adsorbents ◽  
Rice Husks ◽  
Porous Carbons ◽  
Inorganic Pollutants ◽  
Steam Activation ◽  
Virus Removal ◽  
Silica Removal ◽  
Effective Removal

Porous carbons are well-known efficient adsorbents for a variety of organic and inorganic pollutants; however, they have difficulty in virus removal. In this study, novel porous carbons (NPCs) (NPC-A, NPC-B, and NPC-C) derived from rice husks were compared with commercially available activated carbons (ACs) for their ability to remove MS2 bacteriophages (MS2) in a batch experiment. NPC-A was produced by the silica removal process. NPC-B was prepared with an additional steam activation applied to NPC-A. NPC-C was obtained with an additional acid rinse applied to NPC-B. The NPCs (particularly NPC-C) exhibited effective removal of up to 5.3 log10 of MS2, which was greater than that of less than 2.7 log10 obtained by other ACs under 10 g/L during the same contact time (60 min). The pore size distribution of the porous carbon adsorbents was found to influence their virus removal performance. The adsorbents with a larger proportion of pores ranging from 200–4500 nm in diameter were able to achieve higher virus removal rates. Thus, NPCs (particularly NPC-C), which had a larger volume of pores ranging from 200–4500 nm in size, demonstrated the potential for use as efficient adsorbents for removing viruses during water purification.

scholarly journals Thermodynamic Behaviors of Adsorbed Methane Storage Systems Based on Nanoporous Carbon Adsorbents Prepared from Coconut Shells

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2243
Author(s):  
Ilya Men’shchikov ◽  
Andrey Shkolin ◽  
Evgeny Strizhenov ◽  
Elena Khozina ◽  
Sergey Chugaev ◽  
...  
Keyword(s):  
Storage Tank ◽  
Activated Carbons ◽  
Storage System ◽  
Nitrogen Adsorption ◽  
Methane Adsorption ◽  
Carbon Adsorbents ◽  
X Ray ◽  
Coconut Shells ◽  
Activation Conditions ◽  
Charge Discharge

The present work focused on the experimental study of the performance of a scaled system of adsorbed natural gas (ANG) storage and transportation based on carbon adsorbents. For this purpose, three different samples of activated carbons (AC) were prepared by varying the size of coconut shell char granules and steam activation conditions. The parameters of their porous structure, morphology, and chemical composition were determined from the nitrogen adsorption at 77 K, X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), and scanning electron microscopy (SEM) measurements. The methane adsorption data measured within the temperature range from 178 to 360 K and at pressures up to 25 MPa enabled us to identify the most efficient adsorbent among the studied materials: AC-90S. The differential heats of methane adsorption on AC-90S were determined in order to simulate the gas charge/discharge processes in the ANG system using a mathematical model with consideration for thermal effects. The results of simulating the charge/discharge processes under two different conditions of heat exchange are consistent with the experimentally determined temperature distribution over a scaled ANG storage tank filled with the compacted AC-90S adsorbent and equipped with temperature sensors and heat-exchanger devices. The amounts of methane delivered from the ANG storage system employing AC-90S as an adsorbent differ from the model predictions by 4–6%. Both the experiments and mathematical modeling showed that the thermal regulation of the ANG storage tank ensured the higher rates of charge/discharge processes compared to the thermal insulation.

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