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Citation: LI Yan, HOU Wan-Guo. Adsorption of Low-substituted Cationic Starch on Aluminum Magnesium Hydrotalcite Analogue[J]. Chinese Journal of Applied Chemistry, ;2010, 27(7): 811-816. doi: 10.3724/SP.J.1095.2010.90595 shu

Adsorption of Low-substituted Cationic Starch on Aluminum Magnesium Hydrotalcite Analogue

LI Yan ^a, ,
HOU Wan-Guo ^b

a. Department of Chemistry, Changzhi College, Changzhi;
b. Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100

Received Date: 4 September 2009
Revised Date: 5 January 2010

The adsorption of low-substituted cationic starch(CS-L) on Mg-Al HTlc was investigated. The following results were obtained: CS-L can be adsorbed on the external surface of positively changed Mg-Al HTlc. The adsorption isotherm followed the typical Langmuir equation and the saturated adsorption amount was 33.92 mg/g. The driving force for adsorption was probably due to two effects:(1) hydrogen bonding between the hydroxyl group or ether group of CS-L and the hydroxyl group of HTlc; (2) entropic effect,where the entropic loss for the CS-L adsorption is less then entropic gain for the released solvent molecules. The adsorption amount of CS-L increased with pH,which may be contributed to the decrease of the zeta potentials of CS-L and the HTlc with pH. The adsorption amount of CS-L increased with the addition of NaCl and CaCl₂ because inert electrolytes screened the repulsion between HTlc particles and CS-L and the intra-molecular repulsion between the cationic groups of the CS-L. At pH=9,the adsorption of CS-L on HTlc increased dramatically with the concentration of AlCl₃ since the hydrolysate of Al³⁺ might play a role as a linkage between CS-L and HTlc,and. The adsorption amount of CS-L decreased with increasing temperature as a result of hydrogen bonding decrease. The adsorption kinetics of CS-L on Mg-Al HTlc showed that the equilibrium time of adsorption was about 300 min. Furthermore,the comparison of adsorption behaviors between CS-L and CS-H on Mg-Al HTlc was also carried out.
- adsorption,
- hydrotalcite analogue,
- low degree of substitution,
- cationic starch
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