Direct fabrication of hierarchically processed pineapple peel hydrogels for efficient Congo red adsorption.

Affiliation

Beijing Laboratory of Food Quality and Safety, Beijing Technology and Business University, Beijing 100048, China. Electronic address: [Email]

Abstract

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, BT-PPH 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.

Keywords

Adsorption,Cellulose,Congo red,Hydrogel,Ionic liquid,Pineapple peel,

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