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Relationship of the cellulose and lignin contents in biomass to the structure and RB-19 adsorption behavior on activated carbon

Abstract

In order to investigate the relationship between different material compositions and the structure of activated carbons (ACs), a series of ACs were prepared with different mass ratios of cellulose and lignin as raw materials and by activating the ZnCl2 activation through microwave heating, and the ratios were set to (pure cellulose (AC-1), 3.5:1 (AC-2), 3.5:3.5 (AC-3), 3.5:5 (AC-4), respectively.All samples were characterized by N2adsorption–desorption,scanning electron microscopy, elemental analysis, Fourier transform infrared spectroscopy, andX-ray photoelectron spectroscopy.In addition, the adsorption behavior of ACs toreactive blue 19 (RB-19) wascarried outbybatch experiments, which furtherexplainedthe effect of cellulose and lignin contents on the performance of ACs. Whenthe ratio of cellulose and lignin for the preparation of AC was 3.5:3.5, AC-3 presented the lowest polarity ((O + N)/C = 0.22) and the highest aromaticity (H/C = 0.17), as well as possing a well-developed mesoporous structure andthe adsorption capacity can reach to 488.46 mg g-1 at 293 K. Andthe probable reason was that cellulose played a key role in maintaining the mesopore structure, and lignin promoted the formation of the layered and microporous structure during the preparation of ACs. Besides, the experimental adsorptiondata of ACsfittedwellwiththe pseudo-second-order kinetic and Langmuir isotherm models, and the adsorption process was spontaneous and endothermic.Thus,ACcan be obtained from cellulose and lignin feasibly, and the contents significantly affected the performance of AC. These findings can serve as basis for the preparation high-performance biomass-based AC.

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Publication details

The article was received on 17 Jun 2018, accepted on 07 Aug 2018 and first published on 08 Aug 2018


Article type: Paper
DOI: 10.1039/C8NJ03007C
Citation: New J. Chem., 2018, Accepted Manuscript
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    Relationship of the cellulose and lignin contents in biomass to the structure and RB-19 adsorption behavior on activated carbon

    Y. Xue, C. Du, Z. Wu and L. Zhang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ03007C

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