Synthesis and characterization of magnetic β-cyclodextrin-chitosan nanoparticles as nano-adsorbents for removal of methyl blue.
A novel nano-adsorbent, β-cyclodextrin-chitosan (CDC) modified Fe(3)O(4) nanoparticles (CDCM) is fabricated for removal of methyl blue (MB) from aqueous solution by grafting CDC onto the magnetite surface. The characteristics results of FTIR, SEM and XRD show that CDC is grafted onto Fe(3)O(4) nanoparticles. The grafted CDC on the Fe(3)O(4) nanoparticles contributes to an enhancement of the adsorption capacity because of the strong abilities of CDCM, which includes the multiple hydroxyl, carboxyl groups, amino groups and the formation of an inclusion complex due to the β-CD molecules through host-guest interactions, to adsorb MB. The adsorption of MB onto CDCM is found to be dependent on pH and temperature. Adsorption equilibrium is achieved in 50 min and the adsorption kinetics of MB is found to follow a pseudo-second-order kinetic model. Equilibrium data for MB adsorption are fitted well by Langmuir isotherm model. The maximum adsorption capacity for MB is estimated to be 2.78 g/g at 30°C. The CDCM was stable and easily recovered. Moreover the adsorption capacity was about 90% of the initial saturation adsorption capacity after being used four times.
Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong (University of Jinan), School of Chemistry and Chemical Engineering, University of Jinan, Jinan, China. fanlu1949@126.com
Lulu
L
Fan
Ying
Y
Zhang
Chuannan
C
Luo
Fuguang
F
Lu
Huamin
H
Qiu
Min
M
Sun
D000327:Adsorption; D001557:Benzenesulfonates / Q000737:chemistry*; D048271:Chitosan / Q000138:chemical synthesis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D059346:Magnets; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D013696:Temperature; D013816:Thermodynamics; D047392:beta-Cyclodextrins / Q000138:chemical synthesis / Q000737:chemistry*
D001557:Benzenesulfonates; D047392:beta-Cyclodextrins; C571277:chitosan-beta-cyclodextrin; D048271:Chitosan; C414357:Methyl Blue