• Title, Summary, Keyword: activated carbon

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Physical Property with the Manufacturing Conditions of Activated Carbon for Mercury Adsorption (제조조건에 따른 활성탄의 특성 및 수은 흡착 효율)

  • Min, Hyo-Ki;Ahmad, Tanveer;Park, Min;Lee, Sang-Sup
    • Journal of Korean Society for Atmospheric Environment
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    • v.31 no.3
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    • pp.302-314
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    • 2015
  • There is an adsorption method using activated carbon as a typical method for removing elemental mercury. Physical characteristics of activated carbon such as specific surface area and volume of pore (micro and meso) have positive effect for mercury adsorption. Activated carbon is carbon-based material with a high specific surface area. This activated carbon can be manufactured through carbonization and activation process. In this process, physical characteristics of specific surface area and pore distribution are changed by controlling operating parameters like temperature, time and reagent of activation. In this study, we evaluated characteristics of activated carbons manufactured from pinewood and coal with the operating parameters. We evaluated mercury adsorption capacities of the activated carbons having excellent physical characteristics and compared those to the commercial activated carbon.

Characteristics of pore structure of steam activated carbon with carbonization temperature (수증기 활성화법으로 제조된 활성탄의 탄화온도에 따른 세공구조 고찰)

  • 이송우;나영수;김도한;최동훈;류동춘;송승구
    • Journal of Environmental Science International
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    • v.9 no.4
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    • pp.345-349
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    • 2000
  • Activated carbons were prepared from Korean coal by steam activation in this study. The variation of pore structure of the activated carbons were investigated according to different carbonization temperatures. Yield, surface area, pore volume and pore structure of this activated carbon were compared with those of activated carbon prepared without carbonization. The investigated carbonization temperature ranged from 700${\circ}C$ to 1,000${\circ}C$. Carbonization was carried out in nitrogen atmosphere for 70 minutes and activation was performed by steam at 950${\circ}C$ for 210 minutes. Surface area and pore volume of the resulting activated carbons increased with carbonization temperature. Also pore volume increased by 20% compared to the activated carbon without carbonization. Especially, in mesopore region, the activated carbon carbonized at 900${\circ}C$ had more pores by 60% than that of activated carbon carbonized at other temperature.

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A Study on the Availability of Activated Sludge for the $Pb^{2+}$ Removal in Aqueous Solution (수용액중 납이온 제거를 위한 활성슬러지의 이용가능성에 관한 연구)

  • 김동석;서정호
    • Journal of Environmental Science International
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    • v.7 no.5
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    • pp.697-705
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    • 1998
  • $Pb^{2+}$ removal capacity and initial $Pb^{2+}$ removal rate were compared between non-biomaterials (granular activated carbon, powdered activated carbon, ion exchange resin, zeolite) and biomaterials (activated sludge, Aureobasidium pullulans, Saccharomyces cerevisiae). The $Pb^{2+}$ removal capacity of biomaterials were greater than that of non-biomaterials, generally. The $Pb^{2+}$ removal capacities of non-biomaterials and biomaterials were shown on the order of ion exchange resin > zeolite > granular activated carbon > powdered activated carbon and A. pullulans > S. cerevisiae > activated sludge, respectively. In the initial $Pb^{2+}$ removal rate, the non-biomaterials showed powdered activated carbon > granular activated carbon > zeolite > ion exchange resin and the biomaterials showed A. pullulans > activated sludge > S. cerevisiae. Comparing the $Pb^{2+}$ removal capacity and initial $Pb^{2+}$ removal rate of activated sludge with those of other non-biomaterials and biomaterials, activated sludge may have an availability on the removal of heavy metal ions by the economical and pratical aspects.

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Preparation of Activated Carbon from Wastepaper and Adsorption of Endocrine Disrupting Chemicals

  • Okayama, Takayuki;Matsushita, Kiyofumi;Sasuzuki, Hiroma;Shimada, Masahiro
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • pp.279-284
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    • 2006
  • Activated carbon is proposed as a new application of wastepaper recycling other than the paper-making. Waste kraft bag is considered to be a suitable raw material for activated carbon because of its low ash content. Small pellets of wastepaper squeezed out from the continuous kneader were carbonized in a nitrogen atmosphere and activated using carbon dioxide. The BET specific surface areas of activated carbon prepared from waste kraft bag was $1,285m^{2}/g$, which is higher than commercially available activated carbons. The activated carbon prepared from wastepaper has a well-developed porous structure, particularly in mesopore and macropore ranges. As a result, activated carbon with iodine adsorption capacity of 1,400 mg/g was obtained from waste kraft bag. In this paper, adsorption amount of Bisphenol A (BPA) was determined to investigate adsorbability of activated carbon from waste kraft bag. Adsorption measurements were on solutions ranging from $0.1{mu}g/L\;to\;100mg/L$. The activated carbon from waste kraft bag gave higher BPA adsorbabilities over a wide range, compared with commercially available activated carbons.

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Effect of Characteristics of Activated Carbon Particles on Oragnic Removal and Membrane Permeability in Activated Carbon - Membrane Process (활성탄-막 공정에서 활성탄 입자 특성이 유기물 제거와 막 여과 효율에 미치는 영향)

  • Han, Sang-Jun;Hong, Seong-Ho;Lee, Sang-Ho
    • Journal of Korean Society of Water and Wastewater
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    • v.27 no.3
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    • pp.363-371
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    • 2013
  • In this study, effect of activated carbon size on flux and fouling of membrane was investigated on activated carbon and membrane hybrid system. The activated carbon was prepared with crushing and screening. The activated carbon was named by A100, B100, A200, B200, A325 and B325 due to size of activated carbon. The permeability for A100, B100, A200 and B200 showed no significant difference. However, the permeability for A325 and B325 was decreased rapidly and was lowed due to increase the concentration of NOM. Main resistance for A100, B100, A200 and B200 was identified as irreversible fouling. However main resistance for A325 and B325 was identified as reversible fouling. The smaller activated carbon adsorbs NOM faster than bigger particles, which can show high permeability at early stage of the operation and then showed faster decrease of permeability at end of the operation.

Adsorption capability of activated carbon synthesized from coconut shell

  • Islam, Md Shariful;Ang, Bee Chin;Gharehkhani, Samira;Afifi, Amalina Binti Muhammad
    • Carbon letters
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    • v.20
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    • pp.1-9
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    • 2016
  • Activated carbon was synthesized from coconut shells. The Brunauer, Emmett and Teller surface area of the synthesized activated carbon was found to be 1640 m2/g with a pore volume of 1.032 cm3/g. The average pore diameter of the activated carbon was found to be 2.52 nm. By applying the size-strain plot method to the X-ray diffraction data, the crystallite size and the crystal strain was determined to be 42.46 nm and 0.000489897, respectively, which indicate a perfect crystallite structure. The field emission scanning electron microscopy image showed the presence of well-developed pores on the surface of the activated carbon. The presence of important functional groups was shown by the Fourier transform infrared spectroscopy spectrum. The adsorption of methyl orange onto the activated carbon reached 100% after 12 min. Kinetic analysis indicated that the adsorption of methyl orange solution by the activated carbon followed a pseudo-second-order kinetic mechanism (R2 > 0.995). Therefore, the results show that the produced activated carbon can be used as a proper adsorbent for dye containing effluents.

Analysis of physical properties of activated carbon for water purification made by using coal and commercial activated carbon (석탄을 이용하여 제조한 상수처리용 활성탄과 상업용 활성탄의 물성특성 분석)

  • 최동훈;김종수;안철우;이철승;박진식
    • Journal of environmental and Sanitary engineering
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    • v.17 no.2
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    • pp.48-54
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    • 2002
  • In this study, the physical properties of coal-based(bituminous, anthracite·bituminous) activated carbon were compared with those of four different commercial activated carbon used for water treatment. In case of bituminous coal and blend coal, the results of SEM analysis indicated that more pore was extended and shaped in activation process than carbonization process. The results of BET analysis indicated that specific surface area of P Co. activated carbon was larger than the others, and C Co. activated carbon, S Co. activated carbon and anthracite + bituminous was similar. Therefore, adsorption capacities and breakthrough time of anthracite + bituminous regarded similar to C Co. activated carbon.

A Study on the Adsorption of Hg(II) Ion by Activated Carbon(1) (活性炭에 依한 Hg(II) 이온의 吸着에 관한 조사연구(1))

  • Lee, Hyun;Lee, Jong-Hang;Yun, O. Sub
    • Journal of Environmental Health Sciences
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    • v.14 no.2
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    • pp.65-71
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    • 1988
  • In this study, the method of adsorption by activated carbon in the removal of Hg(II) ion in waste water was treated. The influence of kinds of activated carbon and effect of temperature and the influence of coexistent salt on adsorption rates, the influence of pH in the adsorption, equilibrium and adsorption of mercury from activated carbon were investigated. From the adsorption on activated carbon of mercury(II) ion in the presence of cyanide or thiocyanate ion was found that mercury(II) was easily adsorved onto the activated carbon in the form of complex artion such as Hg(CN)$_4^{2-}$, Hg(SCN)$_4^{2-}$ respectively. ZnCl$_2$ activation method had a higher adsorptive ability than steam activation method in adsorption of Hg on activated carbon. Activated carbon adsorbed iodide ion is very effective on adsorption of Hg.

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An Overview of the Activated Carbon Fibers for Electrochemical Applications

  • Lee Gyoung-Ja;Pyun Su-Il
    • Journal of the Korean Electrochemical Society
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    • v.9 no.1
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    • pp.10-18
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    • 2006
  • This article is concerned with the overview of the activated carbon fibers. Firstly, this review provides a comprehensive survey of the overall processes for the synthesis of the activated carbon fibers from the carbonaceous materials. Subsequently, the physicochemical properties such as pore structures and surface oxygen functional groups of the activated carbon fibers were discussed in detail. Finally, as electrochemical applications of the activated carbon fibers to electrode materials for electric double-layer capacitor (EDLC), the electrochemical characteristics of the activated carbon fiber electrodes and the various methods to improve the capacitance and rate capability were introduced. In particular, the effect of pore length distribution (PLD) on kinetics of double-layer charging/discharging was discussed based upon the experimental and theoretical results in our work. And then we discussed in detail the applications of the activated carbon fibers to adsorbent materials for purification of liquid and gas.

Removal of boron in seawater by activated carbon adsoprtion (활성탄 흡착에 의한 해수중의 보론 제거)

  • Kim, Han-Seung;Kang, Joon-Seok;Kim, Byung-Ro
    • Journal of Korean Society of Water and Wastewater
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    • v.25 no.6
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    • pp.917-922
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    • 2011
  • Adsorption characteristics of boron on activated carbon was investigated in order to evaluate the use of activated carbon for the removal of boron in desalination processes using SWRO. Boron was removed ranging from 54~60% when the concentration of activated carbon was 1,000 mg/L in 6 hours under the initial boron concentration of 5 mg/L. The removal of boron increased by 20~22% with the increase of pH from 5 to 9. Organic matter had adverse effect on the adsorption of boron on activated carbon. Boron removal decreased by 10-12% when EDTA was added at 1 mg/L under 5 mg/L of boron and 200mg/L of activated carbon. In this results, activated carbon would be a good candidate for a pretreatment of desalination processes by SWRO from the view of mitigating the feed boron concentration to RO and meeting the effluent boron concentration without post-treatment after RO.