期刊
CARBOHYDRATE POLYMERS
卷 230, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.115599
关键词
Pineapple peel; Cellulose; Ionic liquid; Hydrogel; Adsorption; Congo red
资金
- National Key R&D Program of China [2016YFD0400200]
- National Natural Science Foundation of China [31901683, 31972102, 31671881]
- Fundamental Research Funds for the Central Universities [SWU118066]
- Open Project Program of the Beijing Laboratory of Food Quality and Safety, Beijing Technology and Business University [FQS-201908]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2018jcyjA0939]
- Chongqing Technology Innovation and Application Demonstration Project [cstc2018jscx-msyX0804]
Herein, the hierarchically processed pineapple peel was achieved by water (WT-PP), alkali (AT-PP), bleaching (BT-PP) and bleaching-alkali (PPC) treatments respectively for separate or simultaneous removal of hemicellulose and lignin. These treated pineapple peel were further fabricated into hydrogels (WT-PPH, AT-PPH, BTPPH and PPCH, respectively) by a facile dissolution-regeneration process in ionic liquid. The structure and Congo red (CR) adsorption ability of the hydrogels were investigated and compared. The adsorption process conformed better to the pseudo-second-order kinetic and Langmuir isotherm models. The maximum adsorption capacity was 114.94 mg/g for WT-PPH, 77.52 mg/g for AT-PPH, 138.89 mg/g for BT-PPH and 75.19 mg/g for PPCH, implying the separate bleaching treatment could improve the CR adsorption capacity more. Moreover, the hydrogels displayed a pH-dependent behavior and good reusability during adsorption process. Based on removal of initial components and simple preparation method, this work would be beneficial for the development of agricultural residues-based biosorbents.
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