Title: Valorization of bamboo biomass using combinatorial pretreatments

Abstract

Current studies concerning liquid hot water pretreatment (LHWP) usually focus on cellulose saccharification or hemicellulose conversion, while the appropriate extraction and utilization of LHWP-induced lignin have not been addressed. To valorize whole biomass, here, in this study, a series of LHWP-based combinatorial pretreatments are proposed using advanced solvent systems. The first LHWP stage removed 73.74% of xylan at the optimized pretreatment severity (~4.0), at the same time preserving almost all the cellulose and lignin. As a result, 9.04 g L^–1 xylo-oligosaccharides (XOSs) were obtained in the prehydrolyzate, representing 63.31% of the degraded xylan. The LHWP also caused the migration and partial degradation of the lignin which benefits the delignification in the second stage of pretreatment utilizing NaOH, deep eutectic solvent (DES) and 1,4-butanediol (BDO) under relatively mild conditions. The proposed combinatorial pretreatment significantly enhanced glucan conversion. The physiochemical structural properties of the untreated and pretreated substrates were investigated with XRD, FTIR, GPC, SEM, and Simons’ staining to understand the mechanisms of different combinatorial pretreatments for overcoming biomass recalcitrance and facilitating integrated biomass valorization. Finally, the physical and chemical properties of the regenerated lignins were analyzed. The results revealed that lignins from LHWP–NaOH pretreatment preserved most of the native β-O-4 structuremore » (37.1%). Thus it could be used as an ideal method for the catalytic production of aromatic monomers. On the other hand, LHWP–DES pretreatment generated lignins with low molecular weight and high phenolic OH content, which is promising for synthesizing resins and antioxidants. In conclusion, the proposed combinatorial pretreatment established a reliable sequential pretreatment methodology for maximizing the output of bamboo biomass and may fit into different biorefinery configurations for various value-added products.« less

Authors:

Huang, Chen ^[1]; Zhan, Yunni ^[2]; Wang, Jia ^[3]; Cheng, Jinyuan  ^[2];

• Search DOE PAGES for author "Cheng, Jinyuan"
• Search DOE PAGES for ORCID "0000-0003-2025-2566"

Meng, Xianzhi  ^[4];

• Search DOE PAGES for author "Meng, Xianzhi"
• Search DOE PAGES for ORCID "0000-0003-4303-3403"

Liang, Luna ^[5]; Liang, Fangmin ^[2]; Deng, Yongjun ^[2]; Fang, Guigan ^[6]; Ragauskas, Arthur J.  ^[7]

• Search DOE PAGES for author "Ragauskas, Arthur J."
• Search DOE PAGES for ORCID "0000-0002-3536-554X"

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+ Show Author Affiliations

1. Jiangsu Province Key Laboratory of Biomass Energy and Materials, Nanjing (China); Nanjing Forestry University, Nanjing (China); University of Tennessee, Knoxville, TN (United States)
2. Jiangsu Province Key Laboratory of Biomass Energy and Materials, Nanjing (China)
3. Nanjing Forestry University, Nanjing (China); University of Tennessee, Knoxville, TN (United States)
4. University of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
5. University of Tennessee, Knoxville, TN (United States)
6. Jiangsu Province Key Laboratory of Biomass Energy and Materials, Nanjing (China); Nanjing Forestry University, Nanjing (China)
7. University of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Joint Institute for Biological Science

Publication Date:

Wed Apr 13 00:00:00 EDT 2022

Research Org.:

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:

USDOE; National Natural Science Foundation for Youth; Jiangsu Province Key Laboratory of Biomass Engineering and Materials; CAF

OSTI Identifier:

1896966

Grant/Contract Number:  

AC05-00OR22725; 32001273; JSBEM-S-202004; CAFYBB2021ZI001-01

Resource Type:

Accepted Manuscript

Journal Name:

Green Chemistry

Additional Journal Information:

Journal Volume: 24; Journal Issue: 9; Journal ID: ISSN 1463-9262

Publisher:

Royal Society of Chemistry

Country of Publication:

United States

Language:

English

Subject:

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; combinatorial pretreatment; enzymatic hydrolysis; xylo-oligosaccharides; lignin; valorization