Adsorption characteristics and the kinetics of the Cr(VI) on the Thuja oriantalis

被引:128
作者
Oguz, E [1 ]
机构
[1] Ataturk Univ, Environm Problems Res Ctr, TR-25240 Erzurum, Turkey
关键词
chromium; adsorption isotherms; Thuja oriantalis;
D O I
10.1016/j.colsurfa.2004.10.004
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The cone biomass of Thuja oriantalis is a waste itself and a readily available adsorbent in nature. The kinetics of adsorption of Cr(VI) by the Thuja oriantalis was found fast, and reached equilibrium in 20 min and followed pseudo second order rate equation. The adsorption behavior of Cr(VI) on the Thuja oriantalis has been studied as a function of the solution agitation rate, pH and temperature. Results have been analyzed by Langmuir Freundlich, Radke-Prausnitz, Brunauer, Emet and Teller (BET) and Dubinin-Radushkevich (D-R) adsorption isotherms. The mean energy of adsorption was calculated as 38.3 kJ mol(-1) from the D-R adsorption isotherm. The rate constants have been calculated for 289, 315 and 333 K, and the activation energy (Ea) was derived using the Arhenius equation. Thermodynamic parameters such as DeltaHdegrees, DeltaSdegrees and DeltaGdegrees were calculated from the slope and intercept of linear plot of In K-D against 1/T. The DeltaHdegrees and DeltaGdegrees values of Cr(VI) adsorption on the Thuja oriantalis show endothermic heat of adsorption. But negative free energy value, indicating that the process of Cr(VI) adsorption is favored at high temperatures. (C) 2004 Published by Elsevier B.V.
引用
收藏
页码:121 / 128
页数:8
相关论文
共 32 条
  • [1] Al-Rub FA., 2002, ENG LIFE SCI, V2, P111, DOI [10.1002/1618-2863(200204)2:43.0.CO
  • [2] 2-Q, DOI 10.1002/1618-2863(200204)2:4<111::AID-ELSC111>3.0.CO
  • [3] 2-Q]
  • [4] [Anonymous], INDIAN J CHEM TECHNO
  • [5] [Anonymous], 1985, STAND METH EX WAT WA, P445
  • [6] Benefield L. D., 1982, PROCESS CHEM WATER W, P433
  • [7] PORE- AND SOLID-DIFFUSION KINETICS IN FIXED-BED ADSORPTION UNDER CONSTANT-PATTERN CONDITIONS
    HALL, KR
    EAGLETON, LC
    ACRIVOS, A
    VERMEULEN, T
    [J]. INDUSTRIAL & ENGINEERING CHEMISTRY FUNDAMENTALS, 1966, 5 (02): : 212 - +
  • [8] The kinetics of sorption of divalent metal ions onto sphagnum moss peat
    Ho, YS
    McKay, G
    [J]. WATER RESEARCH, 2000, 34 (03) : 735 - 742
  • [9] The sorption of lead(II) ions on peat
    Ho, YS
    McKay, G
    [J]. WATER RESEARCH, 1999, 33 (02) : 578 - 584
  • [10] Pseudo-second order model for sorption processes
    Ho, YS
    McKay, G
    [J]. PROCESS BIOCHEMISTRY, 1999, 34 (05) : 451 - 465