Effective Adsorption of Weak Acid Dark Blue 5R by Mg/CTS/FA Composite from Aqueous Solution
HAN Shuangyan
LI Beigang
Abstract：Mg/CTS/FA composite adsorbent was prepared by loading chitosan and magnesium ion onto fly ash.The effect of various operational parameters including solution pH,amount of adsorbent,oscillation frequency,contact time and temperature were investigated.The adsorption kinetics and thermodynamics were discussed.The results indicated that the removal rate and adsorption capacity of WADB 5R on Mg/CTS/FA could achieve 91.77％ and 504.73 mg/g under the conditions of Mg/CTS/FA dosage 4 g/L,adsorption temperature 25 ℃,solution pH of 4 and contact time of 60 min.The adsorption process was well described by pseudo-second-order model.The adsorption process fits well with Langmuir isotherm equation and Dubinin-Radushkevich(D-R)isotherm models.The values of E(D-R),values of Ea and thermodynamic study show that the adsorption may be completed through chemisorption,physical adsorption and hydrogen bonding.Values of adsorption gibbs free energy changes (△G) and adsorption enthalpy changes (△H) show that the adsorption process of WADB 5R is spontaneous and exothermic nature.
Keywords：fly ashchitosancomposite materialweak acid dark blue 5Radsorption
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 1-6 )