Comparative study on enzymatic digestibility of acid-pretreated poplar and larch based on a comprehensive analysis of the lignin-derived recalcitrance.

Photostable transparent wood composite functionalized with an UV-absorber

To enhance the understanding of the effect of xylan removal on the cellulose ultrastructure and subsequent enzymatic hydrolysis, the top-down influence of xylan content on the cell wall, cellulose ...

Understanding the Xylan Content for Enhanced Enzymatic Hydrolysis of Individual Bamboo Fiber and Parenchyma Cells

Cellulase adsorbed on cellulose is productive and helpful to produce reducing sugars in enzymatic hydrolysis of lignocellulose; however, cellulase adsorbed on lignin is non-productive. Increasing productive adsorption of cellulase on cellulose would be beneficial in improving enzymatic hydrolysis. Adding lignin that was more hydrophilic in hydrolysis system could increase productive adsorption and promote hydrolysis. However, the effect mechanism is still worth exploring further. In this study, lignosulfonate (LS), a type of hydrophilic lignin, was used to study its effect on cellulosic hydrolysis. The effect of LS on the enzymatic hydrolysis of pure cellulose (Avicel) and lignocellulose [dilute acid (DA) treated sugarcane bagasse (SCB)] was investigated by analyzing enzymatic hydrolysis efficiency, productive and non-productive cellulase adsorptions, zeta potential and particle size distribution of substrates. The result showed that after adding LS, the productive cellulase adsorption on Avicel reduced. Adding LS to Avicel suspension could form the Avicel–LS complexes. The particles were charged more negatively and the average particle size was smaller than Avicel before adding LS. In addition, adding LS to cellulase solution formed the LS–cellulase complexes. For DA-SCB, adding LS decreased the non-productive cellulase adsorption on DA-SCB from 3.92 to 2.99 mg/g lignin and increased the productive adsorption of cellulase on DA-SCB from 2.00 to 3.44 mg/g cellulose. Besides, the addition of LS promoted the formation of LS–lignin complexes and LS–cellulase complexes, and the complexes had more negative charges and smaller average sizes than DA-SCB lignin and cellulase particles before adding LS. In this study, LS inhibited Avicel’s hydrolysis, but enhanced DA-SCB’s hydrolysis. This stemmed from the fact that LS could bind cellulase and Avicel, and occupied the binding sites of cellulase and Avicel. Thus, a decreased productive adsorption of cellulase on Avicel arose. Regarding DA-SCB, adding LS, which enhanced hydrolysis efficiency of DA-SCB, increased the electrostatic repulsion between DA-SCB lignin and cellulase, and therefore, decreased non-productive adsorption of cellulase on DA-SCB lignin and enhanced productive adsorption of cellulase on DA-SCB cellulose.

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Exploring why sodium lignosulfonate influenced enzymatic hydrolysis efficiency of cellulose from the perspective of substrate-enzyme adsorption.

Recent progress on green electromagnetic shielding materials based on macro wood and micro cellulose components from natural agricultural and forestry resources

Delignification kinetics and selectivity in poplar cell wall with acidified sodium chlorite.

To achieve high mechanical strength electromagnetic interference (EMI) shielding materials for practical application, cellulose nanocrystals (CNC), as a reinforcing and dispersing agent, are intercalated into reduced graphene oxide (RGO) layers, forming an ultrathin, robust, flexible, and hydrophobic CNC/RGO film with a highly ordered nacre-like layered structure via a self-assembly process. The layered structure significantly shortens the reduction time and improves the mechanical strength and shielding effectiveness (SE) of the resultant CNC/RGO composite film. The controlled preparation of CNC with different aspect ratios is realized by using separated bamboo fiber and parenchyma. The CNC of the fiber with a higher aspect ratio and lower diameter results in a lower porosity, denser structure, and more uniform distribution in the composites, and therefore a higher electrical conductivity and SE. The highest SE (39.1 dB) and specific SE (11 367 dB cm2 g−1) with a high tensile strength (179 MPa) and water contact angle (106°) of the CNC/RGO film are obtained at 10 wt% CNC loading with a film thickness of 12 μm. The maximum tensile strength of the composite film reaches 227 MPa with 30–50% CNC. The ultrathin high-performance CNC/RGO film shows significant potential as an EMI shielding material in the aerospace and flexible electronics fields.

Manipulating the assembly of the CNC/RGO composite film for superior electromagnetic interference shielding properties

The invention belongs to the technical field of materials, particularly relates to a bamboo charcoal-based magnetic composite material, and further discloses a preparation method of the material .The method comprises the steps that bamboo charcoal is utilized as a carrier, a chlorine-containing iron salt serves as the raw material, and the composite material is prepared through a high-temperature thermal cracking reaction .According to the bamboo charcoal-based magnetic composite material, moso bamboo powder with a rich natural pore structure serves as the raw material to prepare biochar to serve as a metal carrier and a carbon source, magnetic media are introduced into the biochar through the high-temperature thermal cracking reaction, composite iron oxide or zero-valent iron biochar can be orientedly synthesized by controlling the reaction temperature, the preparation process is simple and easy to operate, operation is convenient, the process conditions are easy to control, the time is saved, the raw materials are cheap, the product yield is high, complex and expensive equipment is not needed, the cost is reduced, the problems that the cost is high, and the preparation process is complex in the traditional method of introducing the magnetic media are solved, and the bamboo charcoal-based magnetic composite material and the preparation method are particularly suitable for industrial production and popularization.

Jiang Zehui

Papers

Delignification kinetics and selectivity in poplar cell wall with acidified sodium chlorite.

Manipulating the assembly of the CNC/RGO composite film for superior electromagnetic interference shielding properties

Bamboo charcoal-based magnetic composite material and preparation method