Surface functionalization methodologies on activated carbons and their benzene adsorption

2020 ◽  
Author(s):  
Prabhu Azhagapillai ◽  
Ahmed Al Shoaibi ◽  
Srinivasakannan Chandrasekar
Keyword(s):  
Surface Functionalization ◽  
Activated Carbons ◽  
Benzene Adsorption

Preparation of Coal-Based Columnar Activated Carbon for Removal of Benzene

2016 ◽  
Vol 878 ◽  
pp. 101-107
Author(s):  
Guo Zhuo Gong ◽  
Ji Liu ◽  
Wen Fen Yang ◽  
Yun Yun Zhou ◽  
Hai Tao Sheng ◽  
...  
Keyword(s):  
Activated Carbons ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Benzene Adsorption ◽  
Process Variables ◽  
Activation Time ◽  
Activation Temperature ◽  
Adsorption Capacities ◽  
Experiment Method ◽  
Preparation Variable

In the paper, a series of coal-based columnar activated carbons (CCACs) for adsorption of benzene were prepared using a factorial experiment method. The CCACs prepared were characterized, and their adsorption capacities toward benzene were measured in a differential fixed-bed reactor. Besides, through a statistical method, the importance degree of preparation variables was studied, and the effects of preparation variables on benzene adsorption capacities of the CCACs were fully evaluated. It was found that pore structure of CCACs prepared was beneficial for benzene adsorption, but preparation variable in the process has little effect on the surface chemistry of CCACs prepared. Based on statistic analysis, it was revealed that among the four process variables studied for the sorbent prepared in this work, the activation temperature was found to be the most significant one for benzene adsorption capacity, next ones are the activation time and the amount of KOH, and the last one is the flow rate of water vapor and their optimal levels were 950 °C, 3.0 h, 2.5 % and 1.25 mL/g/h respectively.

On the Carbon Dioxide and Benzene Adsorption on Activated Carbons To Study Their Micropore Structure

Langmuir ◽  
1997 ◽  
Vol 13 (19) ◽  
pp. 5208-5210 ◽  
Author(s):  
C. Moreno-Castilla ◽  
J. Rivera-Utrilla ◽  
F. Carrasco-Marín ◽  
M. V. López-Ramón
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbons ◽  
Benzene Adsorption ◽  
Micropore Structure

scholarly journals Effects of Gasifying Agents on the Characterization of Nut Shell-derived Activated Carbon

1995 ◽  
Vol 12 (3) ◽  
pp. 247-258 ◽  
Author(s):  
C. Nguyen ◽  
A. Ahmadpour ◽  
D.D. Do
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Activated Carbons ◽  
Benzene Adsorption ◽  
Surface Areas ◽  
Activating Agent ◽  
Micropore Size ◽  
Adsorptive Properties ◽  
Insight Into

Activated carbon was prepared from nut shells using a conventional two-stage method: carbonization followed by activation. Activation with steam or carbon dioxide as activating agent produced a range of chars of different burn-off. These were characterized for their total and micropore surface areas, and benzene adsorption capacity. Benzene adsorption measurement provided an insight into the effect of porosity development on the adsorptive properties of the adsorbent. It was found that activated carbon products from nut shells were comparable, in terms of adsorption characteristics, with activated carbons from other lignocellulosic precursors. The evolution of porosity of the resulting carbons shows that carbon dioxide is the preferable agent for the production of activated carbon with a narrow micropore size distribution.

Surface functionalization of mesoporous and microporous activated carbons by immobilization of diamine

2006 ◽  
Vol 295 (1) ◽  
pp. 299-302 ◽  
Author(s):  
Hisashi Tamai ◽  
Katsumi Shiraki ◽  
Takeshi Shiono ◽  
Hajime Yasuda
Keyword(s):  
Surface Functionalization ◽  
Activated Carbons

Benzene adsorption on microporous activated carbons

Carbon ◽  
1989 ◽  
Vol 27 (3) ◽  
pp. 485-487 ◽  
Author(s):  
M. Jaroniec ◽  
R. Madey ◽  
X. Lu ◽  
J. Choma
Keyword(s):  
Activated Carbons ◽  
Benzene Adsorption

scholarly journals Adsorption Characteristics of Coal-based Activated Carbons. II. Adsorption of Water Vapour, Pyridine and Benzene

1997 ◽  
Vol 15 (1) ◽  
pp. 47-57 ◽  
Author(s):  
Th. El-Nabarawy ◽  
N.Sh. Petro ◽  
S. Abdel-Aziz
Keyword(s):  
Free Surface ◽  
Water Vapour ◽  
Activated Carbons ◽  
Potassium Dichromate ◽  
Adsorbed Water ◽  
Benzene Adsorption ◽  
High Concentration ◽  
Adsorption Of Water ◽  
Acidic Nature ◽  
Oxygen Groups

Chemically-activated carbons were prepared by carbonizing Maghara coal with different amounts of phosphoric acid at 873 K. Steam-activated carbons of different burn-off were prepared by gasifying non-activated carbon prepared by carbonization at 873 K with steam at 1173 K. Samples of steam-activated carbons were also treated with concentrated nitric acid or with potassium dichromate. The adsorption of water vapour and benzene was determined at 308 K. The adsorption of pyridine was followed on the chemically-activated carbons at 343 K. The adsorption of water vapour was found to be related to the surface area and the amount of carbon–oxygen groups. Some of the adsorbed water was found to be specifically held to the surface and could be used to determine the number of carbon–oxygen groups on the surface. Two mechanisms are involved in the adsorption of pyridine on the carbons investigated. These are physisorption on the oxygen-free surface and chemisorption on carbon–oxygen groups of an acidic nature. Benzene may be vertically oriented in micropores, horizontally oriented in wider pores and may be even inaccessible to the fraction of the surface located in ultramicropores. Benzene adsorption is also retarded by the existence of a high concentration of carbon–oxygen groups oh the surface.

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