Adsorption capability for anionic dyes on 2-hydroxyethylammonium acetate-intercalated layered double hydroxide

作者：Bu, Ran; Chen, Feifei^*; Li, Jie; Li, Wei; Yang, Feng

来源：Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2016, 511: 312-319.

DOI：10.1016/j.colsurfa.2016.10.015

• Layered double hydroxides
• 2-Hydroxyethylammonium acetate
• Anionic dye
• Adsorption

In the present study, organic dyes adsorption by MgAl-layered double hydroxides (LDHs) modified with 2-hydroxyethylammonium acetate (HEAA) ionic liquids were investigated. The characterization of XRD revealed that the anion of HEAA was inserted into the interlayer space of LDHs. Moreover, the intercalation composite (HEAA/LDHs) with an expanded layer distance was confirmed. HEAA/LDHs were further characterized by the SEM, FTIR, BET and zeta potential. The effects of contact time, types of dyes, adsorbent dosage and solution pH on the adsorption experiments were evaluated. The maximum of adsorption capability for acid red 27 was 313.6 mg/g. The adsorption process followed the pseudo-second-order kinetic equation. The equilibrium adsorption isotherm data were well fitted by the Langmuir model. The adsorption mechanisms proposed that electrostatic interaction and ion exchange played key roles in this adsorption process. Moreover, dyes could desorb easily from HEAA/LDHs by increasing pH values of the solution. The results suggested that modified LDHs could be employed as an efficient adsorbent material for the removal of anionic dyes from aqueous solutions.

• 出版日期2016-12-20
• 单位武汉纺织大学