A review on surface modification of activated carbon for carbon dioxide adsorption

Shafeeyan, Mohammad Saleh; Daud, Wan Mohd Ashri Wan; Houshmand, Amirhossein; Shamiri, Ahmad

doi:10.1016/j.jaap.2010.07.006

Cited by 958 publications

(574 citation statements)

References 176 publications

(319 reference statements)

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“…nance of pyrrol-and/or pyridine-like structure on the AC surface are observed above 600 °C 27) . It is also represented that amide, imide, lactam, secondary amide and N-alkyl amide groups are incorporated into aromatic surface structures in the form of pyrrol-and/or pyridine-like structure at high temperature 29) .…”

Section: ［No257］mentioning

confidence: 96%

Oxidative coupling and dechlorination of aromatic compounds on modified activated carbon

Iwanaga

Amano

Aikawa

et al. 2013

TANSO

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Dechlorination by oxidative coupling during the adsorption of mono-chlorophenols (mono-CPs) onto activated carbon (AC) was investigated, and the effects of various parameters such as amount of dissolved oxygen, surface structure and temperature of solution on dechlorination amount were examined. Under anoxic conditions, the amounts of adsorption and dechlorination for mono-CPs decreased compared to conditions where oxygen is present. This result indicated that the oxidative coupling would depend on dissolved oxygen. It is known that dissolved oxygen was transformed into reactive oxygen species on the AC surface. Therefore, we propose that reactive oxygen species originating from dissolved oxygen react with chlorophenol, causing dechlorination and the oxidative coupling by radical reaction. The introduction of pyrrole-and/or pyridine-like structures in the carbon by NH 3 gas treatment at temperatures above 700 °C promoted the reduction of dissolved oxygen, which caused the increase in the amount of dechlorination. On the other hand, HNO 3 oxidation of AC noticeably decreased the amount of dechlorination, indicating that the acidic functional groups possessing an electron-withdrawing ability inhibited the reduction of dissolved oxygen on the AC surface. It was also found that the amount of dechlorination and its rate were influenced by the temperature of the solution.

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Section: ［No257］mentioning

confidence: 96%

Oxidative coupling and dechlorination of aromatic compounds on modified activated carbon

Iwanaga

Amano

Aikawa

et al. 2013

TANSO

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“…Dye charges directly interact with adsorbent surface chemistry. Surface chemistry could be different depending on surface modification and its surface functional groups, which have different properties (SHAFEEYAN et al, 2010). Thus, the relationship between molecule charge and adsorbent surface chemistry impacts the adsorption capacity of specific molecules differently.…”

Section: Introductionmentioning

confidence: 99%

Impact of Corona Treated Activated Carbon in Anionic and Cationic Dye Adsorption

Pego

Carvalho

Borges

et al. 2017

CERNE

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Dye degradation is a significant topic in environmental science, since dyes can bring several problems to the environment. Activated carbon (AC) is an important material used as adsorbent of these hazardous substances, but need to be improved especially into specific substances. This paper aimed to evaluate the impact of activated carbon surface modified by corona treatment (electric discharge) on adsorption of different dyes. Activated carbons were treated by corona treatment to cause surface modification, modifying exposure time to treatment (2, 5, 8 and 10 minutes). Evaluation of adsorption was performed by adsorption isotherms and kinetic adsorption. Dyes differed in their charge (anionic or cationic) and molecular weight. Dyes used were Methylene Blue (cationic) and Congo Red (anionic). Surface area and Scanning Electron Microscopy (SEM) were also conducted. Surface chemistry was impacted by corona treatment and interfered in dye adsorption. There was decrease of dye adsorption for both dyes according to time exposure. However, the decrease of Methylene Blue (25%) was higher than Congo Red (14%), suggesting that either charge or molecule weight interfere in the adsorption isotherms. In kinetic adsorption, there was no difference between treatments, although there was a difference in adsorption equilibrium. SEM showed that surface was impacted (pore destruction) by corona treatment. Furthermore, estimated surface area was strongly impacted by the treatment, reducing with the increase of time exposure. Thus, textural properties might have contributed to reduce adsorption capacity of both dyes and play a higher role than chemical properties. IMPACTO DE CARVÕES ATIVADOS TRATADOS COM DESCARGA CORONA NA ADSORÇÃO DE CORANTES CATIÔNICOS E ANIÔNICOSRESUMO: A degradação de corantes é um importante tópico nas ciências ambientais, já que os corantes podem trazer diversos problemas para o meio ambiente. O carvão ativado é um importante material usado como adsorvente dessas substâncias causadoras dos mais diversos danos, mas precisam ser melhoradas especialmente quando envolve substâncias específicas. Este manuscrito tem como objetivo avaliar o impacto da superfície de carvões ativados modificados pelo tratamento corona (descarga elétrica) na adsorção de diferentes corantes. Os carvões ativados foram tratados pelo tratamento corona para promover a modificação na superfície, modificando os tempos de exposição ao tratamento (2, 5, 8 e 10 minutos). A avaliação da adsorção foi realizada pelas isotermas de adsorção e velocidade de adsorção. Os corantes diferiram pelas suas cargas (aniônico e catiônico) e massa molecular. Os corantes utilizados foram o Azul de Metileno (catiônico) e o Vermelho Congo (aniônico).A área superficial e a microscopia eletrônica de varredura (MEV) também foram realizadas. A superfície química foi impactada pelo tratamento corona e interferiu na adsorção dos corantes. Houve decréscimo na adsorção dos corantes para ambos de acordo com o tempo de exposição. No entanto, o decréscimo de Azul de ...

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“…A promising route for developing effective sorbents is their modification with carbon nanomaterials, in particular, carbon nanotubes (CNTs). The most common sorbents are activated carbon (AC) and zeolites, the modification of which substantially increases their adsorption activity [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…As a result of the modification, the surface reactivity, chemical, physical and structural properties of the AC change [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Implementation of carbon nanomodification for sorption materials

2017

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Abstract. The article addresses the urgent task of improving the adsorption capacity and expanding the scope of application for commonly used industrial sorbents -activated carbons and synthetic zeolites. Among a variety of methods for modifying these sorbents, more attention is now being given to techniques that employ carbon nanomaterials. This is due to the unique properties of nanostructures -developed surface, availability of active functional groups, etc. In the present work, the classic materials -NWC coconut shell activated carbon and synthetic NaX zeolite -were chosen as initial sorbent samples to be modified. The authors developed a process flowsheet for the carbon nanomodification, which contains the following main stages: preparation of a catalytic mixture solution under given temperature conditions, impregnation of porous materials using the obtained solution, and drying and synthesis of carbon nanotubes via chemical vapor deposition. The proposed technological line consists of a reactor for synthesis of carbon nanotubes, the patented design of which will allow for simultaneously modifying in an effective way different types of materials. As a result, the layer of carbon nanostructures, the quality of which can be varied by changing the conditions of the modification procedure, is formed on the substrate surface.

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A review on surface modification of activated carbon for carbon dioxide adsorption

Cited by 958 publications

References 176 publications

Oxidative coupling and dechlorination of aromatic compounds on modified activated carbon

Oxidative coupling and dechlorination of aromatic compounds on modified activated carbon

Impact of Corona Treated Activated Carbon in Anionic and Cationic Dye Adsorption

Implementation of carbon nanomodification for sorption materials

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