A supramolecular structure insight for conversion property of cellulose in hot compressed water: Polymorphs and hydrogen bonds changes.
Waste paper samples with different cellulose supramolecular structure were treated in hot compressed water (HCW) at 375°C and 22.5MPa within 200s to evaluate the specific effect mechanism of cellulose supramolecular structure on the conversion of waste paper to reusable resource. Although the distribution of liquid products and the oligosaccharides were related to reaction time, depolymerization and decrystallization of the cellulose, the characteristics absorption peak of cellulose from FTIR analysis and crystal structure of the cellulose detected in the residues with hydrolysis rate up 96.5% indicated crystal structure was the dominant factor that affect conversion behavior of waste paper. The conversion of cellulose Iβ to cellulose Iα or cellulose I(α+β) in HCW demonstrated that the recrystallization occurred during the decrystallization of cellulose through the rearrangement of hydrogen bonds.
School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
Yan
Y
Wang
School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China. Electronic address: lianjie0219@163.com.
Jie
J
Lian
School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; State Key Lab Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China. Electronic address: ppjqwan@scut.edu.cn.
Jinquan
J
Wan
School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; State Key Lab Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China.
Yongwen
Y
Ma
School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
Yingshi
Y
Zhang
D002482:Cellulose / Q000737:chemistry*; D006358:Hot Temperature; D006860:Hydrogen Bonding; D006868:Hydrolysis; D010209:Paper; D014866:Waste Products; D014867:Water / Q000737:chemistry*
D014866:Waste Products; D014867:Water; D002482:Cellulose
5-hydroxymethyl furfural (PubChem CID: 237332); Cellulose (PubChem CID: 14055602); Cellulose polymorphs; Crystallinity; Dioxyacetone (PubChem CID: 670); Erythrose (PubChem CID: 94176); Formic acid (PubChem CID: 284); Fructose (PubChem CID: 53782691); Glucose (PubChem CID: 5793); HCW; Hexose (PubChem CID: 439494); Hexoses; Hydrogen bonds; Levulinic acid (PubChem CID: 11579); Oligosaccharide (PubChem CID: 196569); Waste paper