期刊
CARBOHYDRATE POLYMERS
卷 172, 期 -, 页码 28-39出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.05.039
关键词
Poly(maleicacid)-grafted cross-linked chitosan microsphere; Characterization; Cd(II) ion; Adsorption; Mechanism
资金
- Shandong Province Natural Science Foundation [ZR2014CQ052]
- Applied Basic Research Program for Youngster of Qingdao [15-9-1-42-jch]
- National Natural Science Foundation of China (NSFC) [31400812]
- Science and Technology Development Funds of Qingdao Shinan [2015-5-015-ZH]
A novel adsorbent, composed of poly(maleic acid)-grafted cross-linked chitosan microspheres (PMACCMs), was prepared via cross-linking with glutaraldehyde and modification by grafting maleic acid. FTIR, zeta potential, elemental analysis,C-13 NMR, DTG, laser particle size analysis, SEM, and BET methods were applied to characterize PMACCMs, exhibiting a successful fabrication, good thermostability, and welldefined surface microstructure beneficial to Cd(II) adsorption. The effects of pH, contact time, and initial concentration on Cd(II) adsorption were also investigated, and the maximum adsorption capacity was 39.2 mg g(-1), indicating a great improvement as compared with that (14.5 mg g(-1)) of cross-linked chitosan microspheres. The experimental data were well fitted with pseudo-second-order kinetic and Langmuir isotherm models. Five-cycle reusability tests demonstrated PMACCMs could be repeatedly used with a small adsorption capacity loss (<15%). Additionally, the adsorption mechanism was proposed. All the results confirmed that PMACCMs, which presented outstanding adsorption capability and reusability, could be a good candidate for wastewater purification. (C) 2017 Elsevier Ltd. All rights reserved.
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