期刊：
INDUSTRIAL CROPS AND PRODUCTS,2024年218 ISSN：0926-6690
通讯作者：
Wang, HQ
作者机构：
[Wu, Songlin; Li, Xianjun] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Peoples R China.;[Wang, HQ; Zhao, Jinping; Wang, Hanqing; Li, Chengjun; Xu, Zhaoyang] Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410004, Peoples R China.;[Zhao, Jinping; Wang, Hanqing; Li, Xianjun; Li, Chengjun] Hunan Engn Res Ctr Full Life Cycle Energy Efficien, Changsha 410004, Peoples R China.
通讯机构：
[Wang, HQ ] C;Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410004, Peoples R China.
关键词：
Machine learning;Lignocellulosic biomass;Liquefaction;Bio-polyols yield;Hydroxyl value
摘要：
Amid the escalating demand for alternatives to petroleum resources and the imperative to decrease carbon emissions, there is an increasing interest in transforming lignocellulosic biomass into valuable chemicals. This study utilized machine learning models to analyze the acid-catalyzed liquefaction process of lignocellulosic biomass and to predict and characterize the yield and hydroxyl value (HV) of bio-polyols. A total of 612 yield data samples and 229 HV data samples were collected and analyzed. From these data, four machine learning models were constructed: Random Forest (RF), Gradient Boosting Regression (GBR), Gaussian Process Regression (GPR), and Support Vector Regression (SVR). The Bayesian Optimization Algorithm (BOA) was applied to refine the hyperparameters of the models, thereby enhancing their predictive accuracy. To clarify the effects of input features on predictive outcomes and to understand their interactive dynamics, one-dimensional and twodimensional Accumulated Local Effects (ALE) analyses were performed. The results show that the GBR model was particularly precise in forecasting the yield and HV of bio-polyols, with corresponding test set determination coefficients (R2) of 0.82 and 0.91. The most influential factors on yield were reaction time (15.1 %), lignin content (13.1 %), and glycerol mass (12 %), while for HV, they were glycerol mass (28.9 %), particle size (15.1 %), and liquid-to-solid ratio (11.1 %). The ALE analysis also exposed the intricate interaction mechanisms between feedstock composition and liquefaction conditions. The verification results confirmed that the optimal model displayed exceptional generalization capabilities, with a Mean Absolute Percentage Error (MAPE) of 9.18 %. Utilizing this model, a user-friendly software package has been developed to enable rapid and precise prediction of the lignocellulosic biomass conversion process. This research not only delivers strategies to cut down on experimental costs and time but also offers a novel perspective on the industrial utilization of biomassderived polyols.
摘要：
The long-term protection of bamboo against mold fungi remains a challenge in anti-mold technology, primarily due to the abundance of nutrients within bamboo cell lumens and the poor permeability of bamboo. This study aimed to enhance the effectiveness of organic compound biocide in the long-term protection of bamboo against mold fungi through bioincising pretreatment with Trametes versicolor. The results showed that bamboo pretreated with bioincising exhibited long-term mold resistance with an efficacy of 100 % in both 20-week laboratory and 3month outdoor tests. During T. versicolor bioincising, the fungal hyphae invaded the interior of the bamboo, leading to a notable 56.6 % increase in biocide uptake while causing an 8 % reduction in mass loss. Furthermore, bamboo pretreated with T. versicolor exhibited a reduction in both starch and reducing sugar contents, and a slight decrease in lignin and cellulose contents. These findings suggested that the improved long-term mold resistance was primarily due to the consumption of nutrients within the cell lumen and increased absorption of organic biocide by T. versicolor bioincising. This study highlighted the use of bio-pretreatment to improve the long-term mold resistance of bamboo, thus prolonging the durability of bamboo-based products.
摘要：
In pursuit of sustainable development goals, the transformation of biomass resources into high-value chemicals has become a focal point within the academic community. Despite being a biomass resource, reed (Phragmites australis) has not yet fully realized its potential in the production of bio-based polyols. This study utilized Response Surface Methodology (RSM) and an Artificial Neural Network (ANN) enhanced by a Genetic Algorithm (GA) to model and optimize the liquefaction process of reeds. Furthermore, this study employed a pre-existing predictive model to estimate the hydroxyl value of reed-derived liquefaction products, thereby aiming to curtail expenses during the biomass chemical development phase. The results demonstrated that both the RSM and GA-ANN models accurately predict bio-polyol yield, with the RSM model outperforming the ANN model. Based on optimal conditions predicted by the RSM model, the best experimental process parameters were established: raw material particle size 2-12 mesh, solid-liquid ratio 5:1, glycerol content 32.5%, catalyst content 3.6%, temperature 169 degrees C, and reaction time 58 minutes. Under these conditions, the polyol yield reached 89.145%, with a relative deviation of 2.366%, and the bio-polyol exhibited a viscosity of 0.51 Pa & sdot;s. The predicted hydroxyl value for the bio-based polyol was found to be 399.19 mg KOH/g. The liquefied product is rich in hydroxyl groups, indicating its potential application value in preparing bio-based polymer materials. This study introduces innovative approaches to the economical production of bio-based polyols at the laboratory scale, which may pave the way for their broader industrial implementation.
摘要：
Transformation of biomass wastes or residues into functional carbon materials is one of the main approaches to improve their added value and utilization rate. In this work, an example of discarded bamboo fibers was used to fabricate trimetallic functionalized 1D carbon composite with excellent electromagnetic wave (EW) absorption performances, via a simple solvothermal-carbonization method. When the thickness is below 2.0 mm, the composite has a minimum reflection loss (RLmin) of -61.6 dB and a specific RL value of -253 dB mg-1 mm-1, as well as an effective absorption band of 5.4 GHz at a low mass loading of 15 wt%. Such good performances are attributed to the synergetic effect of dielectric loss from bamboo fiber carbon and magnetic loss from Fe-Co-Ni interaction that greatly improved the impedance matching. In addition, bamboo fibers with rough surface could endow ample core-shell FeCoNi nanoparticles to uniform embed, which brings large number of interfaces and defects for the composite to enhance the electromagnetic loss capacity. This work provides a trimetallic compositing idea and a sustainable design approach for using biomass wastes to produce stable and efficient EW absorption materials.
期刊：
International Journal of Biological Macromolecules,2024年258(Pt 2):128975 ISSN：0141-8130
通讯作者：
Yang, Xi;Li, XJ
作者机构：
[Fan, Shutong; Yang, Xi; Li, Xianjun; Yang, X; Li, XJ] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Gao, Xun] Wenzhou Univ Technol, Coll Architecture & Energy Engn, Wenzhou 325006, Peoples R China.
通讯机构：
[Yang, X; Li, XJ ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Chinese fir;Flame retardant;Phytic acid;Thermal stability;Zinc phytate
摘要：
To be suitable for certain construction and furniture applications, wood must be treated with a flame retardant and impregnating flame retardants into the cellulose lumens of wood is an effective flame retardant method. Phytic acid, the main storage form of phosphorus in various plant tissues, is an inexpensive, and non-toxic biomaterial that shows potential applications as an environmentally friendly bio-based flame retardant. In this study, phytic acid and zinc phytate were used to impregnate delignified wood under vacuum and pressure, which greatly enhanced the flame retardancy and smoke suppression properties of Chinese fir, while still maintaining its original texture. Phytic acid and zinc phytate were hydrogen-bonded to cellulose in wood. Phytic acid and zinc phytate were hydrogen-bonded to cellulose in wood. The results showed that the total heat release (THR) of Chinese fir treated with zinc phytate decreased from 55.66MJ/m(2) to 5.90MJ/m(2), and a compact carbonized protective layer was quickly formed on the surface of Chinese fir after ignition. Thermogravimetric analysis (TGA) showed that the char yield of Chinese fir treated by the flame retardant was 177.6% higher than that of untreated wood. This study provides an efficient, sustainable, and economical method to prepare Chinese fir with excellent flame retardancy and thermal insulation performance.
摘要：
Strong, lightweight, and shape-memory cellulose aerogels have great potential in multifunctional applications. However, achieving the integration of these features into a cellulose aerogel without harsh chemical modifications and the addition of mechanical enhancers remains challenging. In this study, a strong, lightweight, and water-stimulated shape-memory all-cellulose aerogel (ACA) is created using a combination strategy of partial dissolution and unidirectional freezing from bamboo. Benefiting from the firm architecture of cellulose microfibers bridging cellulose nanofibers /regenerated cellulose aggregated layers and the bonding of different cellulose crystal components (cellulose I beta and cellulose II), the ACA, with low density (60.74 mg cm-3), possesses high compressive modulus (radial section: 1.2 MPa, axial section: 0.96 MPa). Additionally, when stimulated with water, the ACA exhibits excellent shape-memory features, including highly reversible compression-resilience and instantaneous fold-expansion behaviors. As a versatile scaffold, ACA can be integrated with hydroxyapatite, carboxyl carbon nanotubes, and LiCl, respectively, via a simple impregnation method to yield functionalized cellulose composites for applications in thermal insulation, electromagnetic interference shielding, and piezoresistive sensors. This study provides inspiration and a reliable strategy for the elaborately structural design of functional cellulose aerogels endows application prospects in various multifunction opportunities. A combination strategy of partial dissolution and unidirectional freeze is developed for the fabrication of strong, lightweight, and shape-memory all-cellulose aerogel with the unique anisotropic structure of cellulose microfibers bridging nanofibers/regenerated cellulose aggregated layers. As a versatile scaffold, the aerogel holds great promise for applications in thermal insulation, electromagnetic interference shielding, and piezoresistive sensors.image
期刊：
Wood Material Science & Engineering,2023年18(5):1641-1649 ISSN：1748-0272
通讯作者：
Kang Xu<&wdkj&>Xianjun Li
作者机构：
[Ge, Yanglin; Lu, Tong; Ren, Yiming; He, Mingyun; Xu, Kang; Li, Xianjun; Zhou, Chenfei] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha, Peoples R China.
通讯机构：
[Kang Xu; Xianjun Li] C;College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha, People’s Republic of China<&wdkj&>College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha, People’s Republic of China
关键词：
Moisture content;bamboo slab density;bamboo slab thickness;temperature distribution;vapor pressure distribution
摘要：
Bamboo scrimber was made by "hot in-cold out" hot-pressing with hot parameters of 5 MPa, 150 degrees C and 40-180 min. The variation of temperature and vapor pressure were investigated during hot-pressing of bamboo slabs with various initial moisture content (IMC; 5, 10, 15, and 20%), slab target density (TD; 0.9, 1.0, 1.1, and 1.2 g/cm(3)), slab target thickness (TT; 15, 30, 45, and 60 mm) using thermocouple sensors and a self-made press-monitoring system. The results showed obvious stages in the temperature and vapor pressure behavior of bamboo slabs during hot-pressing. IMC showed a limited effect on temperature but an obvious increase in vapor pressure. TD and target TT exhibited good linear relationships with the time to reach 120 degrees C in the core layer, suggesting this can be used as an indicator of hot-pressing time. However, both TD and TT correlate less well with the vapor pressure, which might reflect differences in the size or fluffing degree of bamboo bundles.
摘要：
The widespread utilization of bamboo in the field of building and construction has sparked growing interests in conducting research on fire performance of bamboo. This study investigated fire performance of bamboo treated with flame retardants that possess water-soluble and environmental friendly characteristics. The synergistic effect of APP and P-N-B complexed flame retardant on flame resistance were evaluated, while absorption capacity and moisture absorption rate were also evaluated in relation to impregnation duration and solution concentration. The results indicated that absorption capacity increased with impregnation duration and solution concentration. It was observed solution concentration had a significant impact on moisture absorption for both APP and P-N-B complexed series. The ideal impregnation duration and solution concentration were found to be 6 h and 30%, respectively. Both APP and P-N-B complexed series significantly improved the fire performance of bamboo, but the latter exhibited a superior effect due to its synergistic combination of P, N and B. The FPIs of APP and P-N-B complexed series increased by factors of 2.4 and 4.1 compared to the untreated one. Both facilitated the formation of stable char layers and exerted their influence in gaseous phase through release of non-combustible gas for fuel dilution and free radicals mitigation.
作者机构：
[徐康; 张晓萌; 李中昊; 周川玲; 吕建雄; 李贤军; 吴义强] College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;Zhejiang Academy of Forestry, Hangzhou;310023, China;Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing
通讯机构：
College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha, China
期刊：
Science of Advanced Materials,2022年14(8):1369-1377 ISSN：1947-2935
作者机构：
[Li, Xian-jun; Wang, Yong] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Deng, La-yun; Li, Yong-jin; Wu, Hong; Wang, Yong] Hunan Acad Forestry, Changsha 410004, Hunan Province, Peoples R China.;[Yang, Shou-lu] Guizhou Acad Forestry, Guiyang 550005, Guizhou Provinc, Peoples R China.
关键词：
Poplar Wood;Mechanical Performance;Synergistic Effect;Water Resistance;Thermal Stability;Delivered by Ingenta
摘要：
<jats:p>This study proposes a green and facile method by combining furfuryl alcohol (FA) and organic montmorillonite (OMMT) to solve the undesirable intrinsic properties and improve the performance of fast-growing wood. Wood/FA/OMMT nanocomposites (WPNCs) were fabricated by vacuum-pressure impregnation of FA/OMMT solution into wood cavities with the following<jats:italic>in situ</jats:italic>polymerization to generate an interpenetrating network structure in cell structures. The FA and OMMT were distributed inside cell walls and transition areas between cell walls and cell lumens through SEM-EDXA and CLSM analyses. The resultant WPNCs had enhanced dimensional stability and water resistance ability. The incorporation of FA and OMMT could further improve the mechanical performance and the thermal stability of WPNCs. Therefore, FA/OMMT could synergistically enhance the performance of fast-growing wood.</jats:p>
摘要：
With the desire of promoting the further development of wood production, Soy protein-based adhesives (SPs) have been modified to overcome the defect of poor water resistance in the existing reports. Herein, the microcrystalline cellulose (MCC) was grafted by 3-Glycidyloxypropyltrimethoxysilane (KH560) to obtain IP: 182 75 148 10 On: Fri 12 Aug 2022 10:57:13 a modified microcrystalline cellulose (MMCC). The soybeaflour wamixed with ethylene glycol diglycidyl Copyright: American Scien ific Publis hers ether/diethylenetriamine (EGDE/DETA) and thMMCC to prpare the modified soy protein-based adhesive. De vered by ngenta The results showed that the adhesive with multiple additives had a better performance due to the interpenetrating network structure of soy protein molecules. The contact angle (CA) increased from 33.97 degrees to 58.88 degrees. The wet bonding strength increased to 0.99 MPa. Consequently, the objective of this study is to provide a new strategy for manufacturing a new environmental adhesive.
作者机构：
[杨喜; 曹敏; 简煜; 庞晓娜; 李贤军] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[杨喜; 曹敏; 简煜; 庞晓娜; 李贤军] 410004, China
通讯机构：
[Li, X.] C;College of Materials Science and Engineering, China
作者机构：
[Zhu, Yuan; Li, Wei; Meng, Desen; Li, Xianjun; Li, XJ] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Goodell, B; Goodell, Barry] Univ Massachusetts, Morrill Sci Ctr IV N, Dept Microbiol, Amherst, MA 01003 USA.
通讯机构：
[Goodell, B ] U;[Li, XJ ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;Univ Massachusetts, Morrill Sci Ctr IV N, Dept Microbiol, Amherst, MA 01003 USA.
关键词：
Brown rot;Chemical composition;Crystal structure;Incipient decay;Non-enzymatic degradation
摘要：
Masson pine undergoes rapid degradation by brown-rot fungi, but how the fungus alters the microstructure of Masson pine cell wall is still unclear. In this study, Masson pine samples were incubated with Gloeophyllum trabeum to aid in characterizing changes in the crystalline structure of cellulose and chemical composition of wood in brown-rot decay. Fungal action resulted in an initial increase in wood cellulose crystallinity and crystallite width because of early removal of the more amorphous celluloses, followed by a decrease in crystallinity and crystallite size. All data suggest that hemicellulose, amorphous cellulose and crystalline cellulose are sequentially depolymerized via a non-enzymatic pathway, concurrent with early-stage changes in the rearrangement of cellulose chains and the diffusion of depolymerized less-crystalline polysaccharides out of the cell wall. Our work provides insight into the role of a non-enzymatic system in brown-rot decay as well as its potential application in lignocellulose preservation and biorefineries.
摘要：
<jats:p>Response surface methodology (RSM) was used to optimize the preparation conditions of nano-hybrid wood/polymer composites with montmorillonite (MMT) and furfuryl alcohol (FA). The effects of MMT amount, impregnation pressure and impregnation time on weigh percent gain (WPG) of treated samples were evaluated with Box-Behnken design (BBD) of a 3-level-3-factor from RSM. The predictive model for the response was extremely significant (p < 0.01). The determination coefficient (√R<jats:sup>2</jats:sup>) and the adjusted determination coefficient (VR<jats:sup>2</jats:sup>) of this model were 0.9651 and 0.9203, respectively. The optimal preparation conditions obtained by RSM design with the assistance of Design Expert were determined as follows: 4 wt% MMT amount, 0.8 MPa impregnation pressure, and 80 min impregnation time. It could be concluded from the SEM images that MMT and FA coated the cell walls and filled cell lumens. Moreover, the thermal stability was also investigated. The effects of preparation conditions were further validated by analyzing the water uptake ratio (WU), modulus of elasticity (MOE) and modulus of rupture (MOR) of the pristine samples and the treated samples prepared under optimized conditions.</jats:p>
作者机构：
[曹敏; 邓雨希; 全鹏; 徐康; 杨喜; 李贤军] College of Materials Science and Engineering, Central South University of Forestry Technology, Changsha;410004, China;[曹敏; 邓雨希; 全鹏; 徐康; 杨喜; 李贤军] 410004, China
