期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 192, 期 2, 页码 832-836出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2011.05.094
关键词
Starch; Adsorbent; Synthesis; Toxic metal ions; Removal
资金
- Natural Science Foundation of Fujian Province of China [2010J01291, E1010026]
- Central Universities [JB-JD1001]
A novel effective starch-based adsorbent was prepared through two common reactions, which included the esterification of starch with excess maleic anhydride in the presence of pyridine and the cross-linking reaction of the obtained macromonomer with acrylic acid by using potassium persulphate as initiator. The percentage of carboxylic groups of the macromonomer ranged from 14% to 33.4%. The cross-linking degree of the adsorbent was tailored with the amount of acrylic acid which varied from 10 wt% to 80 wt%. Both Fourier transform infrared spectra and thermogravimetric analysis results verified the structure of the adsorbent. The maximum gel fraction and swelling ratio of the adsorbent were about 72% and 6.25, respectively, and they were able to be adjusted with the amount of monomers. The weight loss percentage of the adsorbent could reach 96.9% after immersing in the buffer solution that contained a-amylase for 14h. It was found that the adsorption capacities of the adsorbent for lead and mercury ions could be 123.2 and 131.2 mg/g, respectively. In addition, the adsorbent was able to remove ca. 51-90% Pb(II) and Hg(II) ions that existed in the decoctions of four medicinal herbals. (C) 2011 Elsevier B.V. All rights reserved.
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