Research on preparation of crosslinked chitosan microspheres and its adsorption properties for aromatic carboxyl compounds in water
HUANG Pu
SHI Wenjian
PAN Minmin
PENG Yang
WEN Haifeng
Abstract：Using chitosan as raw material, liquid paraffin as dispersant, formaldehyde as pre-crosslinking agent and epichlorohydrin as crosslinking agent, crosslinked chitosan microspheres were prepared by reversed-phase suspension method. The adsorption properties of crosslinked chitosan microspheres on aromatics carboxy compounds in water were studied. The results showed that it had fast adsorption rate and large adsorption capacity, the saturated adsorption capacity of crosslinked chitosan microspheres for 2-hydroxy-3-naphthoic acid, α-naphthoic acid and benzoic acid were 702. 0 mg·g-1, 320. 1 mg·g-1, 176. 3 mg·g-1at the p H value of 3. 5and 288 K, respectively. The adsorption process conformed to the Lagergren-second-order kinetic equation, and the adsorption isotherm model conformed to the Langmuir isotherm adsorption equation, which was mainly monolayer adsorption. The adsorption process was a spontaneous, exothermic and entropic reduction process with physical adsorption and chemical action. The crosslinked chitosan microspheres had good recycling ability. After 8 cycles of regeneration, the adsorption capacity could still be stabilized above 97％.
Keywords：crosslinked chitosan microspherearomatic carboxyl compoundsreversed-phase suspension methodadsorption property
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 8-18 )