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2008, Vol.9, No.1

  • 1.

    Adsorption of Dyes from Aqueous Solution by Cow Dung Ash

    V. K. Rattan | Abhiti Purai | Harminder Singh and 1other persons | 2008, 9(1) | pp.1~7 | number of Cited : 1
    The ability of cow dung ash without any pretreatment to remove color from textile dyes N Blue RGB, Green B and EOSINYWS from aqueous solution has been investigated in this work. Cow dung ash, an ecofriendly and low cost adsorbent wasprepared by burning cow dung cakes in the mufle furnace at 500˚C. The adsorption was achieved under diferent pH andadsorbate concentration. The data was fitted to simple polynomial and the isotherms similar to Langmuir and Freundlichisotherms.
  • 2.

    Removal of Pb(II) and Cd(II) From Aqueous solution UsingOxidized Activated Carbons Developed From Pecan Shells

    A. M. Youssef | Sahar M. EL-Khouly | Th. El-Nabarawy | 2008, 9(1) | pp.8~16 | number of Cited : 0
    Oxidized activated carbons were prepared by reacting steam-activated carbon developed from pecan shells with nitric acidof varying strength (15, 30, 45 and 60%). The textural properties and the chemistry of the surface of the non-oxidized and ofthe oxidized carbons were determined from nitrogen adsorption and base neutralization capacities. The uptake of Pb(I) andCd(II) from aqueous solution by these carbons was determined by kinetic and equilibrium experiments as well as by thecolumn method.Treatment with nitric acid brought about drastic decrease in surface area and remarkable increase in the pore size of thecarbon with these changes depending on the strength of nitric acid. Nitric acid increased the surface acidity by developingnew surface oxygen functional groups of acidic nature. HNO3-oxidized carbons exhibited high adsorption capacities for Pb(II)and Cd(II). The adsorption of these ions increased with the decrease of the surface pH of the carbon and with the increase ofthe solution pH from 2.5 to 6 and 7. The amount adsorbed from lead and cadmium was also related to the amount of surfaceacidity, the pH of the point of zero charge and on some metal ion parameters. Cadmium and lead uptake by the investigatedcarbons followed pseudo-second order model and the equilibrium sorption data fitted Langmuir adsorption model.
  • 3.

    Laser Ablated Carbon Thin Film from Carbon Nanotubes andTheir Property Studies

    Maheshwar Sharon | M. Rusop | T. Soga and 1other persons | 2008, 9(1) | pp.17~22 | number of Cited : 4
    A carbon nanotube (CNT) of diameter ~ 20 nm has been synthesized by spray pyrolysis of turpentine oil using Ni/Fe catalyst. Pellet of CNTs has been used as a target to produce semiconducting carbon thin film of band gap 1.4 eV. Presence of oxygen pressure in the pulse laser deposition (PLD) chamber helped to control the sp3/sp2 ratio to achieve the desired band gap. Results are discussed with the help of Raman spectra, SEM TEM micrographs and optical measurements suggest that semiconducting carbon thin film deposited by PLD technique has retained its nanotubes structure except that its diameter has increased from 20 nm to 150 nm.
  • 4.

    Selective Removal of Cr (VI) and Cr (III) in Aqueous Solution bySurface Modified Activated Carbon

    Jeong-Min Lee | Young-Seak Lee | Min-Il Kim | 2008, 9(1) | pp.23~27 | number of Cited : 1
    The adsorption and reduction of Cr (VI) to Cr (III) by surface modified activated carbon (AC) in an aqueous solution wasstudied. The effects of surface modifications on the properties of the carbons were investigated by the analysis of specificsurface area, carbon surface pH, acid/base surface values and functional groups. In order to understand the Cr(VI) adsorptionand reduction ratio from Cr(VI) to Cr(III), the Cr adsorption capacity of AC was also measured and discussed by usinginductively coupled plasma and UV spectrophotometer. The modifications bring about substantial variation in the chemicalproperties whereas the physical properties such as specific surface area, pore volume and pore size distribution nearly were(N1-AC and N2-AC) were recorded on 98.2, 99.7 and 100%. Cr(III) reduction efficiency of R-AC increased largely from0.4% to 28.3% compared to N1-AC and N2-AC.
  • 5.

    Flexural Behaviors of 4D Carbon/carbon Composites withthe Preform Architectures

    Ki-Woong Lee | Jong-Min Park | Hyeok-Jong Joo | 2008, 9(1) | pp.28~34 | number of Cited : 1
    Multidirectional reinforcement is aimed primarily at overcoming interlaminar weaknes, hence a major interest liesin the mechanical properties of multidirectional carbon/carbon composites. Mechanical properties depend on the typeof carbon fiber, the size of the fiber bundle, the spacing of the bundles, the angles of the bundles relative to the axes ofthe block, and matrix formation. In the present studies, PAN based carbon fiber preforms manufactured diferent size ofcoal tar pitch as matrix precursor was caried out. Scanning electron microscopy has ben used to study the fracturebehavior of composites. The size of unit cell of the preforms has considerably affected on the flexural properties aswell as microstructure of the carbon/carbon composites.
  • 6.

  • 7.

    Carbon Materials as Catalysts

    Seongyop Lim | Doohwan Jung | Seong-Ho Yoon and 1other persons | 2008, 9(1) | pp.47~60 | number of Cited : 3
    Understanding the exact structure and surface characteristics of carbon materials is very important for design, synthesis, and utilization of the best carbon form with particular functions and high performance for practical applications such as selective adsorption adsorbents, energy storage materials, catalysts or catalyst supports, etc. This review paper focuses on carbon surface properties and the interaction between gaseous or liquid substances and carbon surface. Catalytic functions of carbon materials are reviewed including recent progress in synthesis and applications of nano-carbons.