Thermodynamic parameters for adsorption equilibrium of heavy metals and dyes from wastewaters.
This meta-analysis evaluates adsorption studies that report thermodynamic parameters for heavy metals and dyes from wastewaters. The adsorbents were derived from agricultural waste, industrial wastes, inorganic particulates, or some natural products. The adsorption mechanisms, derivation of thermodynamic relationships, and possible flaws made in such evaluation are discussed. This analysis shows that conclusions from the examined standard enthalpy and entropy changes are highly contestable. The reason for this flaw may be the poor physical structure of adsorbents tested, such that pore transport controlled the solute flux, leaving a surface reaction process near equilibrium.
Department of Environmental Engineering, Fudan University, Shanghai, China; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
Xiang
X
Liu
Department of Environmental Engineering, Fudan University, Shanghai, China; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan; Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan. Electronic address: djlee@ntu.edu.tw.
Duu-Jong
DJ
Lee
D000327:Adsorption; D004396:Coloring Agents / Q000302:isolation & purification*; D019216:Metals, Heavy / Q000302:isolation & purification*; D013816:Thermodynamics; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D004396:Coloring Agents; D019216:Metals, Heavy; D062065:Wastewater; D014874:Water Pollutants, Chemical
Adsorption; Dye; Equilibrium; Heavy metal; Thermodynamics