期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 539, 期 -, 页码 400-413出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.12.078
关键词
Cucurbit [8] uril; Chitosan; Graft; Dyes; Pb(II) ion; Adsorption
资金
- Foundation of Hubei Provincial Education Department [D20131605]
- Discipline Innovation Team Project of Wuhan Textile University [201401020]
The development of a high-efficiency adsorption material is important for the simultaneous elimination of heavy metal ions and organic pollutants from wastewater. In the present work, a novel material was synthesized by grafting functionalized cucurbit [8] uril (CB[8]) onto chitosan (CS) chains via a C-N-C covalent bond (CB[8]-CS). This as-prepared material presented an unprecedented adsorption capacity. The maximum adsorption capacities (q(m)) were 1622.7 mg/g, 1172.7 mg/g, 1361.9 mg/g and 873.6 mg/g for the adsorption of reactive orange 5 (RO5), acidic blue 25 (AB25), reactive yellow 145 (RY145) and Pb2+ ions, respectively, which are far higher than the reported data. The simultaneous co-adsorption of dye and a heavy metal ion was tested with a mixed solution of 200 mg/L RO5 dye and Pb2+ ion, and the removal rates were 97% and 70% for RO5 and Pb2+, respectively. The adsorption mechanism was explored by means of the IR spectrum and the UV-vis diffuse reflection spectrum (DRS) together with theoretical calculations. The adsorption of dyes was mainly driven by the strong interaction between dye molecules and the hydrophobic cavity of CB[8], and the Pb2+ adsorption was mainly driven by the coordination of Pb2+ with the carbonyl of the CB[8] port and the amino group of chitosan. The ultrahigh adsorption capacity allows the use of CB[8]-CS as potential adsorbent for the simultaneous removal of heavy metal ions and organic dyes from aqueous solution. (C) 2018 Published by Elsevier Inc.
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