Adsorption of Methyl Violet Dye onto Acid Modified Activated Carbon: Isotherms and Thermodynamic Analyses
An investigation has been conducted on the removal of methyl violet (MV), a basic dye using acid modified coal-based activated carbon as an adsorbent. The commercially available activated carbon of F200 was treated with 15 wt% H2SO4 solution and dried prior to use. The batch adsorption experiments were executed under these operating parameters; initial concentrations between 50 to 250 mg.L -1 , temperatures at 303, 313 and 323 K, initial pH 7 and agitation speed of 100 rpm. Equilibrium isotherms were analyzed by Langmuir, Freundlich, Temkin and Dubnin-Radushkevich(D-R) equations and the goodness of fits were inspected using linear regression coefficients, R 2 . The equilibrium data were well described by Freundlich, Temkin and D-R equation at all range of operating parameters. The Gibbs free energy (-ΔG°) is found to be significantly increased from 19.6 to 21.3 kJ.mol -1 as the temperature increased. Consequently, the enthalpy (.H°) and entropy (.S °) were found at 6.2 kJ.mol -1 and 0.085 kJ.mol -1 K -1 , respectively. The findings from this study strongly suggested that the involved adsorption system was spontaneous and endothermic in nature.
Methyl Violet Langmuir Freundlich Temkin Dubnin-Radushkevich
MOHD DIN, A.T. FOO,C.Y HAMEED, B.H. AHMAD, A.L.
School of Chemical Engineering, Universiti Sains Malaysia Engineering Campus,14300 Nibong Tebal, Penang, Malaysia
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）