Removal of phthalate esters by alpha-cyclodextrin-linked chitosan bead.
Removal of phthalate esters (PAEs) by alpha-cyclodextrin (CD)-linked chitosan bead in aqueous solution was studied. Results of kinetic experiments indicated that diheptyl phthalate (DHpP) was adsorbed most efficiently (3.21 mg/g) among the six PAEs. DHpP recovery was 94.6% from alpha-CD-linked chitosan bead by shaking both with a mixture of methanol and water (v/v = 8/2). The recovered alpha-CD chitosan bead was reusable as an adsorbent 20 times in the batch tests. The adsorbed PAE by alpha-CD-linked chitosan bead decreased as temperature increased. However, coexisting pH, NaCl, and Ca2+ did not affect adsorption efficiency. It was concluded that the application of low cost alpha-CD-linked chitosan bead could have the potential to effectively remove PAEs from different aquatic environments.
Chen
Chih-Yu
CY
Department of Tourism, Hsing Wu College Taipei 244, Taiwan, ROC.
Chen
Chiing-Chang
CC
Chung
Ying-Chien
YC
D000327:Adsorption; D002118:Calcium / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D004952:Esters / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010795:Phthalic Acids / Q000302:isolation & purification*; D012965:Sodium Chloride / Q000737:chemistry; D013696:Temperature; D047391:alpha-Cyclodextrins / Q000737:chemistry*
D004952:Esters; D010795:Phthalic Acids; D047391:alpha-Cyclodextrins; D012965:Sodium Chloride; D048271:Chitosan; D002118:Calcium; C032613:alpha-cyclodextrin