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Predicting color change in wood during heat treatment using an artificial neural network model

bioResources 2019年第3期13卷 6250-6264页

作者： Van Nguyen, Thi Hai Nguyen, Tat Thang Ji, Xiaodi Guo, Minghui Key Laboratory of Bio-based Material Science and Technology Ministry of Education Northeast Forestry University Harbin150040 China Vietnam National University of Forestry Hanoi Viet Nam

Understanding and mastering the color change of wood during heat treatment is essential in the wood working industry because it saves time and reduces energy costs. An artificial neural network (ANN) was employed in this study to establish the relationship between the process parameters of heat treatment and the color change of wood. Three important parameters: temperature (180 °C, 190 °C, 200 °C, 210 °C, and 220 °C), treatment time (2 h, 4 h, 6 h, and 8 h), and wood species (larch and poplar) were considered as inputs to the neural network. There were four neurons in the hidden layer that were used, and an output layer as wood color. According to the results, the mean absolute percentage errors were determined as 0.53%, 0.65%, and 0.31% in the prediction of color change color (ΔE) values for training, validation, and testing data sets, respectively. Determination coefficients (R2) greater than 0.99 were obtained for all data sets with the proposed ANN models. These results showed that ANN models can be used successfully for predicting the color changes in wood during heat treatment. © 2018, bioResources.

关键词： Neural networks

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Polyether-polyester and HMDI based Polyurethanes:Effect of PLLA Content on Structure and Property

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Chinese Journal of Polymer science 2019年第11期37卷 1152-1161页

作者： Lei Shi Ruo-Yu Zhang Wu-Bin Ying Han Hu Yu-Bin Wang Ya-Qian Guo Wen-Qin Wang Zhao-Bin Tang Jin Zhu Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China School of Material Science and Chemical Engineering Ningbo University Ningbo 315211 China

Thermoplastic poly(ether-ester-urethane)s were synthesized from poly(L-lactide) diols (PLLA diols), polytetrahydrofuran diol (PTMG diols), 4,4'-dicyclohexylmethane diisocyanate (HMDI), and 1,4-butanediol (BDO) by a two-step reaction, and the morphology and property of the resultant TPU could be adjusted by varying the PLLA contents. The soft segment was composed of PLLA and PTMG diols. By controlling the percentage of PLLA in the soft segment, the glass transition temperature and mechanical properties of the polyurethanes could be regulated. based on the FTIR spectrum, we found that two kinds of hydrogen bonding existed individually in soft matrix and hard domain. The hydrogen bonding in soft matrix was unstable, which could be destroyed during elongation. With in situ stretching WAXS and SAXS experiments, we found that the PLLA crystal was destroyed and the PLLA domain oriented along the stretch direction. Finally, we proposed a schematic model to illustrate the microstructures of these elastomers before and after stretch.

关键词： Poly(L-lactide) diol Polyurethane Mechanical property Hydrogen bonding

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Cobalt-catalyzed transfer hydrogenation of nitroarenes to arylhydroxylamines with NH 3 BH 3 : Scope and mechanism

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Journal of Catalysis 2025年 449卷

作者： Dawei Gong Yanlin Zhang Qixuan Li Yufei Li Linan Xing Lina Zhao Degong Kong Key Laboratory of Preparation and Application of Environmental Friendly Materials Ministry of Education College of Chemistry Jilin Normal University Changchun 130103 PR China Department of Chemistry Southern University of Science and Technology Shenzhen 518000 PR China Key Laboratory of Bio-Based Material Science and Technology Ministry of Education College of Material Science and Engineering Northeast Forestry University Harbin 150040 PR China

A novel cobalt-catalyzed transfer hydrogenation of nitroarenes to arylhydroxylamines using ammonia borane (NH 3 BH 3 ) in methanol has been developed. The cobalt catalyst exhibits good selectivity without producing over-reduced by-products. Density functional theory (DFT) calculations and control experiments provide valuable insights into the reaction mechanism, revealing the N–H moiety of NH 3 BH 3 as a key participant in nitroarene reduction. Moreover, DFT calculations reveal that selective control is achieved via the unique square-pyramidal coordination of the cobalt complex with NH 3 BH 3 and hydroxylamine. This coordination ensures that the reduction of nitrobenzene halts at the hydroxylamine stage, enabling the selective reduction of nitrobenzene to hydroxylamine. Moreover, methanol is indirectly involved in the reaction and does not provide hydrogen atoms directly for nitroarene reduction, which differs from the classical solvent-mediated protonolysis mechanism. This study presents a novel and straightforward method for synthesizing arylhydroxylamines.

关键词： Catalysis

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Synergistic reinforcement of PVA films with boric acid and nano-silica for high-barrier food packaging

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Polymer Testing 2025年 150卷

作者： Xinyu Xu Siqi Xie Baoying Shi Di Wu Yu Lin Qiaohui Zhi Yufeng Wang Haiyan Song State Key Laboratory of Bio-based Fiber Materials Tianjin University of Science and Technology Tianjin 300457 China Tianjin Tianshi College Tianjin 301700 China Hebei Beiren New Material Technology Co. LTD Xingtai 055150 China

The increasing environmental crisis caused by the extensive use of disposable plastics highlights the pressing demand for sustainable options. This research investigates an innovative method for enhancing the traits of polyvinyl alcohol (PVA) through the addition of boric acid (BA) as a crosslinking agent, along with γ-aminopropyl triethoxysilane modified nano-silica (NS) to refine the polymer matrix. The research focuses on the PVA/BA/NS composite film, examining its chemical structure, surface morphology, thermal stability, mechanical strength, gas barrier properties, surface wettability and UV-blocking ability. The results demonstrate that the overall performance of the composite film is significantly enhanced through the synergistic effects of boric acid (BA) and NS, achieved via crosslinking, nanofiller reinforcement, and structural optimization. The PVA/BA/NS composite films shown notable improvements in oxygen, water vapor barrier qualities, and mechanical strength. Furthermore, the addition of nano-silica greatly improved the films' surface hydrophobic qualities, improving their suitability for food packaging. Notably, the tensile resistance of the composite film improved by about 60 % relative to the PVA film, exceeding the findings of comparable research. Additionally, oxygen barrier performance improved by approximately 68 %, highlighting a significant enhancement. Furthermore, it was noteworthy that UV-blocking ability of the composite film had also been markedly enhanced. These improvements are essential for developing food packaging materials that offer better protection and longer shelf life for perishable products, while maintaining quality and safety for consumers. The results convincingly indicate that the environmentally friendly composite films created in this research possess considerable promise for use in food packaging applications.

关键词： Polyvinyl alcohol Boric acid Nano-silica Composite film Food packaging

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Electrochemical co-upgrading CO2 and glycerol for selective formate production with 190% overall Faradaic efficiency

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Nano Research 2025年第5期18卷 250-263页

作者： Chen, Dingwen Yang, Siheng Gao, Jing Zheng, Xuan Mao, Jiawei Hu, Qinyuan Sun, Xiaohan Ji, Li Zheng, Xueli Fu, Haiyan Xue, Weichao Chen, Hua Li, Shuang Cheng, Chong Peng, Jing Jiao, Xingchen Li, Ruixiang Grätzel, Michael Xu, Jiaqi Key Laboratory of Green Chemistry & Technology of Ministry of Education College of Chemistry Sichuan University Chengdu610064 China Laboratory of Photonics and Interfaces École Polytechnique Fédérale de Lausanne Lausanne1015 Switzerland Sichuan Institute of Product Quality Supervision and Inspection Chengdu610100 China Key Laboratory of Synthetic and Biological Colloids Ministry of Education School of Chemical and Material Engineering Jiangnan University Wuxi214122 China Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education Northeast Forestry University Harbin150040 China Sichuan Research Institute of Chemical Quality and Safety Testing Chengdu610031 China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu610065 China Faculty of Materials Science and Energy Engineering Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China

The overall energy efficiency (EE) is critical for commercializing promising electrochemical technologies, such as the carbon dioxide reduction reaction (CO2RR). Despite the rapid development of advanced catalysts and reactors for CO2RR, its commercial potential is still hindered by the sluggish oxygen evolution reaction (OER), which causes high cell voltages and low EEs. Herein, we developed a NiOOH@Ni3S2 catalyst on the surface of nickel foam (NF) via an electrochemical surface reconstruction strategy. We observed that the oxidation of glycerol (GLY) to formate (FA) is more thermodynamically favorable than the OER on the developed NiOOH@Ni3S2/NF catalysts. The Ni2+/Ni3+ redox couples within the NiOOH@Ni3S2 heterojunction enhance the charge transfer kinetics between the active sites and adsorbed reaction intermediates, facilitating the highly selective and active generation of FA from GLY oxidation reaction (GOR), with a remarkable Faradaic efficiency (FE) of 94% achieved at 100 mA·cm−2. Comprehensive mechanistic studies identified that the reaction pathway towards FA generation starts from glyceraldehyde intermediates, and glycolate was considered as the key species. Moreover, benefiting from the efficient conversion of CO2 to FA on bismuth nanosheets, the GOR//CO2RR paired electrolysis system realizes a remarkable overall FE of ca. 190% for FA co-production at 160 mA·cm−2 (cathodic FE: 91.25% and anodic FE: 98.70%). This proceeds at a cell voltage of ca. 2.32 V, which is ca. 0.85 V lower than that of OER-assisted CO2RR system at the same current density. This work provides new insights for co-upgrading CO2 and biomass to value-added chemicals. © The Author(s) 2025.

关键词： Electrolytic reduction

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Corrigendum to “A semi-transparent polyurethane/porous wood composite polymer electrolyte for solid-state supercapacitor with high energy density and cycling stability” [Chem. Eng. J. 454 (2023)139954]

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Chemical Engineering Journal 2023年 467卷

作者： Pu Hou Chenxiang Gao Jian Wang Jiuzhou Zhang Yang Liu Jiyou Gu Pengfei Huo Material Science and Engineering College Northeast Forestry University Harbin 150040 China Key Laboratory of Bio-based Materials Science & Technology (Northeast Forestry University) Ministry of Education Harbin 150040 China

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Effect of Adsorption of ZrO2 in Catalysts on the Efficiency of Hydrolysis of Cellulose to Sugar in Aqueous System under Microwave Radiation

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Chinese Journal of Chemistry 2020年第4期38卷 399-405页

作者： Ying Qiao Lixin Feng Zhongqiu Li Zhenyu Zhang Jing Chen Haining Na Jin Zhu Lai Chen Department of Polymer College of Material Science and EngineeringShanghai UniversityShanghai 200444Chino Key Laboratory of Bio-based Polymeric Materials of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboZhejiang 315201China Chemical College Shijiazhuang UniversityShijiazhuangHebei 050035Chino Hebei Building Ceramics Engineering Research Center Shijiazhuang UniversityShijiazhuangHebei 050035Chino

Summary of main observation and conclusion Five types of ZrO2 are used to simply establish an effective aqueous catalytic system with sulfuric acid for the hydrolysis of cellulose to sugar,*** adjusting surface roughness and particle size of ZrO2 dfferent adsorption is ***,following the thought to inhibit the self-aggregation nature of cellulose,after the introduction of ZrO2 with adsorption in catalysts,the efficiency of the hydrolysis of cellulose to sugar is *** results show different ZrO2 can produce different effects during the hydrolysis of the cellulose with rela-tively low *** the optimal conditions,the conversion of cellulose and TRS yield reaches 95.5%and 93.6%,*** this re-search,it reveals the critical point to organize a feasible and useful way for the hydrolysis of cellulose to sugar with high efficiency in an aqueous *** important theoretical and technical support is also provided for the conversion and utiliation of cellulose in the future.

关键词： hydrolysis sugar adsorption

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Development and optimization of lithium-ion sieves through machine learning in complex brine systems

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Separation and Purification technology 2025年 374卷

作者： Birong Yan Yimin Shi Shengkai Liu Wei Wang Zhichen Ba Huiling Li Jing Wang Zefang Xiao Tai Peng Daxin Liang Yanjun Xie Key Laboratory of Bio-based Material Science and Technology Ministry of Education Northeast Forestry University Harbin 150040 PR China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 PR China School of Materials Science and Engineering Jiamusi University Jiamusi 154007 PR China

Lithium ion sieves and their composite materials show great potential in lithium extraction due to their high selectivity and adsorption capacity. However, their performance varies significantly under different conditions due to complex ion interactions and environmental factors, making process optimization challenging with traditional experimental methods. A comprehensive machine learning approach was developed using 12 key material and environmental parameters to predict lithium-ion sieves adsorption performance. Among nine machine learning methods evaluated, the optimized XGBoost model demonstrated superior predictive capability (R 2 = 0.9736 for training, R 2 = 0.8916 for testing) in handling the inherent nonlinearity of adsorption systems. SHapley Additive exPlanations analysis revealed the dominant influence of environmental parameters on adsorption behavior, providing mechanistic insights into the adsorption process. The reliability of the model was validated through 56 independent experiments with three different composite adsorbents (R 2 = 0.7696). A Python-based prediction system was developed for rapid performance assessment. This data-driven strategy establishes a rational framework for optimizing process parameters and developing materials, thereby advancing the industrialization of sustainable lithium extraction technologies.

关键词： Molecular sieves

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Phosphate Adsorption on Amorphous Aluminum Hydroxide-Yielded Transition Aluminas: Insights on Fundamental Chemistry and Making Engineering Adsorbents

SSRN

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SSRN 2022年

作者： Wang, Chunmei Li, Wei Zhao, Xueqin Chen, Zhen Li, Yonghuan Wang, Guichang Dou, Xiaomin Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Key Laboratory of Surficial Geochemistry Ministry of Education School of Earth Sciences and Engineering Nanjing University Nanjing210023 China College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry Ministry of Education Tianjin Key Lab and Molecule-Based Material Chemistry Synergetic Innovation Center of Chemical Science and Engineering Nankai University Tianjin300071 China

Transition aluminas (TAs) are evolved alumina polymorphs during mineral phase transformation from amorphous to crystalline structure, which have been extensively used as engineering adsorbents or platforms of functional materials for pollutants (e.g. eutrophication nutrient PO43-) mitigation in water remediation. A well-understanding of structure-binding activity of pollutants on transition aluminas is essential for developing promising water remediation materials. In this work, TAs were synthesized through annealing amorphous aluminum (oxy)hydroxide, and a decreased trend of phosphate (PO43-) adsorption was observed, which was not in pace with the changes of specific surface areas and site densities. The structure disorders of TAs deteriorated continuously peaked at 700 oC and TA at 700 oC has the largest extent of structural disorder, but does not present the highest adsorption capacity, which is not consistent with the consensus that oxides’ structural disorder facilitate adsorption. Multiple techniques including pair distribution function, selective chemical extraction, 27Al NMR and quantum chemistry were employed to reveal the underneath mechanisms of differences on phosphate adsorption behaviors on TAs. The results indicated the fraction of amorphous contents is the key feature governing PO43- adsorption, regardless of mineral phase, structural disorder, AlOIV/AlOVI arrangement, and Gibbs free energy of adsorption. Three strategic measures are suggested on making promising alumina engineering adsorbents, including tuning transition temperature, introducing non-tetrahedral and non-octahedral nanostructured grains, and employing more potential methods for synthesizing amorphous nanocrystalline composite. This work sheds lights on understanding the fundamental chemistry of phosphate on transition alumina and producing prospective alumina remediation materials. © 2022, The Authors. All rights reserved.

关键词： Alumina

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Pelletization property analysis of raw and torrefied corn stalks for industrial application to achieve agricultural waste conversion

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Energy 2023年 285卷

作者： Zhang, Congyu Chen, Wei-Hsin Ho, Shih-Hsin Park, Young-Kwon Wang, Chengyu Zhang, Ying School of Resources and Environment Northeast Agricultural University Harbin150030 China Department of Aeronautics and Astronautics National Cheng Kung University Tainan701 Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung407 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology Taichung411 Taiwan State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin China School of Environmental Engineering University of Seoul Seoul02504 Korea Republic of Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education Northeast Forestry University Harbin150040 China

Agricultural waste conversion is of great concern to achieve modernization and industrial development and thus leads to a greener route for a sustainable and circular economy. The treatment of corn stalk for pellet production to realize industrial application is implemented, which is conducive to upgrading fuel properties with better storage and transportation characteristics. The obtained results indicate that torrefaction operation is helpful for pellet density enhancement, with a value of up to larger than 0.74 g cm−3. However, the wear strength and hardness are not good enough compared to raw corn stalk, with values of 4.5–7.5 % and 88 kN–92 kN, respectively. A longer compression duration contributes to a greater work condition and higher relative HHV, which is conducive to energy efficiency improvement. To further evaluate the hygroscopicity and moisture resistance capacity of pelletized corn stalk for fuel properties evaluation, the equilibrium moisture content and contact angle reflect that the enhancement of pressure and compression duration are beneficial for moisture resistance capacity improvement, with the values of less than 3.5 % and higher than 130°. When considering the fuel properties and pelletization cost, compromising on operation conditions should be adopted for optimal operation. © 2023 Elsevier Ltd

关键词： Contact angle

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