关键词: 天然棕色棉, 静电纺纤维素膜, 金属离子吸附, 羧基化改性, 吸附特性

Abstract:

To investigate the adsorption of electrospun fiber film to heavy metal ions, the Cu (II) adsorption performance on such material was stdied based on successful preparation of the electrospun fiber film naturally brown cotton. The electrospun fiber film material had much higher adsorption volume of Cu(II) than that of the correspondent raw brown cotton, which was 3~5 times of that of raw cotton material under different pH conditions. After carboxylation modification, the electrospun fiber film could increase its Cu(II) adsorption volume greatly. Under the conditions presented in the paper, the adsorption volume could be as high as about 250 mg Cu(II)/1g electrospun fiber film. Carboxylation modified electrospun fiber film had high rate adsorption performance, and at least 80% of the total adsorption volume could be finished in 16s. The adsorption of Cu(II) on carboxylation modified electrospun fiber film is in the mode of single molecular layer adsorption and had adsorption saturability. The theoretical maximum adsorption volume for prepared material was 526.3 mg Cu(II) /1g electrospun fiber film with a Langmuir constant of 7.133×10-6 L/mg.

Key words: naturally brown cotton, electrospun ecllulosic film, metal ion adsorption, carboxylation modification, adsorption performance.