One-Step Acid Bleachable Pretreatment with a Recyclable Acid Hydrotrope and Chlorate for Biomass Valorization

Zhang, Zhen; Ji, Hairui

doi:10.1007/s12155-022-10524-z

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“…At the same time, several characteristic peaks of lignin also are observed in Fig. 5 , such as the stretching vibration peaks of carboxyl C=O (1719 cm −1 ) and aromatic ring skeletal (1600 cm −1 , 1508 cm −1 and 1418 cm −1 ) [ 29 ], the vibration peaks of benzene ring (1457 cm −1 ), and C=O bonds of guaiacyl (G) units (1118 cm −1 ), and the breathing vibration peaks of syringyl (S) (1328 cm −1 ) and condensed guaiacyl (G) (1276 cm −1 ). Besides, the peak at 1226 cm −1 was attributed to the stretching vibration of C–C and C=O groups [ 30 ], the peaks at 1034 cm −1 and 830 cm −1 were assigned to the aromatic C–H in-plane deformation vibrations and the C–H out-of-plane stretching vibration, respectively [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Valorization of Boehmeria nivea stalk towards multipurpose fractionation: furfural, pulp, and phenolic monomers

Zhang,

Tao,

2023

Biotechnol Biofuels

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Background As one of the most abundant bioresource in nature, the value-added utilization of lignocellulosic biomass is limited due to its inherent stubbornness. Pretreatment is a necessary step to break down the recalcitrance of cell walls and achieve an efficient separation of three main components (cellulose, hemicelluloses, and lignin). Results In this study, hemicelluloses and lignin in Boehmeria nivea stalks were selectively extracted with a recyclable acid hydrotrope, an aqueous solution of P-toluenesulfonic acid (p-TsOH). 79.86% of hemicelluloses and 90.24% of lignin were removed under a mild pretreatment condition, C80T80t20, (acid concentration of 80 wt%, pretreatment temperature and time of 80 °C and 20 min, respectively). After ultrasonic treatment for 10 s, the residual cellulose-rich solid was directly converted into pulp. Subsequently, the latter was utilized to produce paper via mixing with softwood pulp. The prepared handsheets with a pulp addition of 15 wt% displayed higher tear strength (8.31 mN m2/g) and tensile strength (8.03 Nm/g) than that of pure softwood pulp. What’s more, the hydrolysates of hemicelluloses and the extracted lignin were transformed to furfural and phenolic monomers with yields of 54.67% and 65.3%, respectively. Conclusions The lignocellulosic biomass, Boehmeria nivea stalks, were valorized to pulp, furfural, and phenolic monomers, successfully. And a potential solution of comprehensive utilization of Boehmeria nivea stalks was provided in this paper. Graphical Abstract

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Section: Resultsmentioning

confidence: 99%