壳聚糖/纤维素气凝胶球的制备及其甲醛吸附性能

doi:10.3969/j.issn.0253-2417.2017.01.004

Abstract

Abstract: Cellulose aerogel beads(CAB) and chitosan/cellulose aerogel beads(CCAB) were prepared through droplet-suspension gelation processing,and then the acid treated CAB(CAB-A) and acid treated CCAB(CCAB-A) were obtained through acetic acid post-processing from CAB and CCAB. Morphologies,chemical states,element distributions and pore structures of the aerogel beads were characterized and analyzed by SEM,FT-IR,XPS and BET. Meanwhile,formaldehyde adsorption performances of the aerogel beads were measured by gaseous formaldehyde adsorption test. The results showed that the prepared aerogels had uniform spherical shape,and the average particle sizes of CAB, CAB-A,CCAB and CCAB-A were (2.67±0.01), (2.47±0.02), (2.79±0.05) and (3.34±0.05) mm, respectively. Chitosan molecules were introduced into the cellulose matrix and no significant chemical changes occurred during the preparation. In addition,chitosan molecules by acid treatment were renewably distributed and self-assembled in the network of cellulose gel, formed more intensive aerogel network structure,and provided abundant pore structure with the specific surface area and mesoporous volume of CCAB-A of 1 350.7 m²/g and 4.511 cm³/g,respectively. Thus the adsorbing capacity of the composite aerogel beads reached up to 1.99 mmol/g after adsorption for 1 h which was far greater than that by coconut shell activated carbon material with same dosage (0.39 mmol/g). The chemical combination of azomethine and schiff base was formed between primary amine and formaldehyde molecule in the aerogel beads.

Key words: cellulose, chitosan, aerogel beads, adsorption, formaldehyde

CLC Number:

TQ35

LIU Zhiming, WU Peng. Preparation of Chitosan/Cellulose Aerogel Beads and Its Formaldehyde Gas Adsorption Performance[J]. Chemistry and Industry of Forest Products, 2017, 37(1): 27-35.

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Preparation of Chitosan/Cellulose Aerogel Beads and Its Formaldehyde Gas Adsorption Performance

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