TY - JOUR
T1 - Selective degradation and oxidation of hemicellulose in corncob to oligosaccharides
T2 - From biomass into masking agent for sustainable leather tanning
AU - Jiang, Zhicheng
AU - Gao, Mi
AU - Ding, Wei
AU - Huang, Chenjun
AU - Hu, Changwei
AU - Shi, Bi
AU - Tsang, Daniel C.W.
N1 - Funding Information:
This work is financially supported by the National Natural Science Foundation of China (22078211), China Postdoctoral Science Foundation (2019M663489), Sichuan Science and Technology Program (2020YJ0023) and the Fundamental Research Funds for the Central Universities (2019SCU12059). We appreciate Hui Wang from the Analytical & Testing Center of Sichuan University for her help with SEM characterization. We also thank Dr. Xiu He at college of biomass science and engineering, Sichuan University, for experimental assistance.
Funding Information:
This work is financially supported by the National Natural Science Foundation of China ( 22078211 ), China Postdoctoral Science Foundation ( 2019M663489 ), Sichuan Science and Technology Program ( 2020YJ0023 ) and the Fundamental Research Funds for the Central Universities ( 2019SCU12059 ). We appreciate Hui Wang from the Analytical & Testing Center of Sichuan University for her help with SEM characterization. We also thank Dr. Xiu He at college of biomass science and engineering, Sichuan University, for experimental assistance.
Publisher Copyright:
© 2021 Elsevier B.V.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/7/5
Y1 - 2021/7/5
N2 - Chrome-free metal tanning agent has been considered as eco-friendly in the leather industry. However, extensive crosslinking reactions of metal species on the leather surface restrain their uniform penetration into the hierarchical nanoscale leather matrix. Thus, masking agents with appropriate coordination ability are needed. Herein, the selective degradation of hemicellulose in corncob was achieved with 92.5% of conversion in an AlCl3–H2O system, obtaining oligosaccharides masking agent with high purity and leaving cellulose and lignin in the solid residue for other valuable use. Subsequently, H2O2 oxidation was performed to introduce –CHO/–COOH into oligosaccharides and reduce their molecular weights, thereby enhancing coordination ability and reducing ligand dimension. The post-oxidized reaction fluids together with additional Zr species were subjected to leather tanning, in which the oligosaccharides could coordinate with Al/Zr species and promote the penetration of metal species into the leather matrix. By controlling the hemicellulose degradation and oligosaccharide oxidation, an appropriate concentration of oligosaccharides with proper –CHO/–COOH contents allowed the efficient masking effect of the oligosaccharides. As a result, a uniform distribution of Al/Zr species was observed on the cross section, and 83.5 °C of shrinkage temperature was obtained for the chrome-free tanned leather.
AB - Chrome-free metal tanning agent has been considered as eco-friendly in the leather industry. However, extensive crosslinking reactions of metal species on the leather surface restrain their uniform penetration into the hierarchical nanoscale leather matrix. Thus, masking agents with appropriate coordination ability are needed. Herein, the selective degradation of hemicellulose in corncob was achieved with 92.5% of conversion in an AlCl3–H2O system, obtaining oligosaccharides masking agent with high purity and leaving cellulose and lignin in the solid residue for other valuable use. Subsequently, H2O2 oxidation was performed to introduce –CHO/–COOH into oligosaccharides and reduce their molecular weights, thereby enhancing coordination ability and reducing ligand dimension. The post-oxidized reaction fluids together with additional Zr species were subjected to leather tanning, in which the oligosaccharides could coordinate with Al/Zr species and promote the penetration of metal species into the leather matrix. By controlling the hemicellulose degradation and oligosaccharide oxidation, an appropriate concentration of oligosaccharides with proper –CHO/–COOH contents allowed the efficient masking effect of the oligosaccharides. As a result, a uniform distribution of Al/Zr species was observed on the cross section, and 83.5 °C of shrinkage temperature was obtained for the chrome-free tanned leather.
KW - Chrome-free tanning
KW - HO oxidation
KW - Microwave-assisted conversion
KW - Oligosaccharides
KW - Selective degradation
UR - http://www.scopus.com/inward/record.url?scp=85101225702&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2021.125425
DO - 10.1016/j.jhazmat.2021.125425
M3 - Journal article
AN - SCOPUS:85101225702
SN - 0304-3894
VL - 413
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 125425
ER -