Studies on adsorption performance of carboxymethyl-β-cyclodextrin nano-cavities grafted onto polyacrylamide

Abstract

A novel carboxymethyl-β-cyclodextrin grafted polyacrylamide (CM-β-CD-PAM) was successfully prepared and applied in the adsorption of MB molecules in aqueous solution. The adsorption performance of CM-β-CD-PAM for MB was investigated by changing pH values and temperature of dye solution. The results showed that CM-β-CD-PAM was an effective adsorbent and has high adsorption capacity for MB. The negative value of free energy change indicated that the adsorption of CM-β-CD-PAM for MB was spontaneous. The mechanism of adsorption was ascribed to the formation of inclusion complexes between MB molecules and nano-cavities of CDs from CM-β-CD-PAM, hydrogen bonding and electrostatic interactions between adsorbate-adsorbent.

Keywords:

• β-Cyclodextrin
• polyacrylamide
• nano-cavity
• adsorption

Funding

This work is financially supported by North University of China Research fund and Natural Science Foundation of Shanxi Province of China [2014021015-2, 2013011040-5].