Adsorption of copper-citrate complexes on chitosan: equilibrium modeling.
The effects of complexes on the adsorption of copper from citrate solutions using chitosan were investigated. Various copper to citrate ratios and solution pHs were used to determine the copper adsorption capacity on the chitosan and a mathematical model was developed to simulate the copper adsorption process. According to the model, the three parameters influencing the copper adsorption capacity are the fraction of protonated amine groups (RNH(3)(+)), the fraction of anionic copper-citrate complexes (CuL(-) and CuL(2)(4-)), and the fraction of anionic citrate complexes (HL(2-), H(2)L(-), and L(3-)). The copper adsorption capacities onto chitosan at varying copper-citrate ratios and solution pHs can be predicted by the mathematical model. With such a model to facilitate understand the copper adsorption mechanisms at varying copper-citrate ratios and solution pHs, the copper adsorption efficiency can be increased by the adjustment of the copper-citrate ratio and solution pH.
Lu
Pei-Jen
PJ
Department of Chemical Engineering, Tatung University, Taipei 104, Taiwan.
Hu
Wen-Wei
WW
Chen
Tai-Shang
TS
Chern
Jia-Ming
JM
D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D019343:Citric Acid / Q000737:chemistry*; D003198:Computer Simulation; D003300:Copper / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008956:Models, Chemical; D012996:Solutions; D013696:Temperature
D012996:Solutions; D019343:Citric Acid; D003300:Copper; D048271:Chitosan