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Flame Retardant Material Based on Cellulose Scaffold Mineralized by Calcium Carbonate

Journal of Renewable Materials 2024年第1期12卷 89-102页

作者： Jinshuo Wang Lida Xing Fulong Zhang Chuanfu Liu State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of TechnologyGuangzhou510640China

Wood-based functional materials have developed *** the flammability significantly limits its further *** improve the flame retardancy,the balsa wood was delignified by NaClO2 solution to create a cellulose scaffold,and then alternately immersed in CaCl_(2) ethanol solution and NaHCO3 aqueous solution under *** high porosity and wettability resulting from delignification benefited the following mineralization process,changing the thermal properties of balsa wood *** organic-inorganic wood composite showed abundant CaCO_(3) spherical particles under scanning electron *** peak of the heat release rate of delignified balsa-CaCO_(3) was reduced by 33%compared to the native balsa,according to the cone calorimetric *** flame test demonstrated that the mineralized wood was flame retardant and ***,the mineralized wood also displayed lower thermal *** study developed a feasible way to fabricate a lightweight,fire-retardant,self-extinguishing,and heat-insulating wood composite,providing a promising route for the valuable application of cellulosic biomass.

关键词： Cellulose scaffold delignification CaCO_(3) mineralization fire retardancy

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Quantitative Extraction of p-Coumaric Acid and Ferulic Acid in Different Gramineous Materials and Structural Changes of Residual Alkali Lignin

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Journal of Renewable Materials 2023年第2期11卷 555-566页

作者： Tanhao Zhang Shuo Zhang Wu Lan Fengxia Yue State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of TechnologyGuangzhou510640China

Ferulic acid(FA)and p-coumaric acid(pCA)in bagasse,wheat straw,corn straw,and corncob were extracted by alkaline hydrolysis and characterized by gas chromatography(GC)and gas chromatography-mass spectrometry(GC-MS).It was found that the FA and most of the pCA in gramineous biomass could be dissociated and released after being treated with 1 M NaOH at 100℃for 4 *** yields of pCA/FA in bagasse,wheat straw,corn straw,and corncob determined by GC-FID are 39.8/11.5,13.7/11.0,28.0/11.0,and 35.1/14.5 mg/g,*** raw materials and the treated solid residues were characterized by gel-state 2D Heteronuclear Single Quantum Coherence Nuclear Magnetic Resonance(2D HSQC NMR).It was found that only a small amount of lignin was detected in the residue after alkali treatment,indicating that the alkali treatment conditions can effectively cleave the FA and ***,the lignin in the alkali solution was recovered and characterized by 2D HSQC *** FA was not able to be detected by NMR,whereas a small amount of pCA remained in the alkali *** study reveals the structural change of residual lignins during the quantitative isolation of FA and pCA,which is essential for the selective isolation of pCA/FA and valorization of residual alkali lignin.

关键词： Gramineae ferulic acid p-coumaric acid alkali lignin alkaline pretreatment

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Co-Production of High-Grade Dissolving pulp,Furfural,and Lignin from Eucalyptus via Extremely Low Acid Pretreatment and pulping Technologies and Catalysis

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Journal of Renewable Materials 2023年第6期11卷 2555-2574页

作者： Chengxiang Li Yue Wu Chunhui Zhang Yao Liu Qixuan Lin Junli Ren State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of TechnologyGuangzhou510640China

Hemicellulose and lignin are not reasonably utilized during the dissolved pulp preparation *** work aimed to propose a process for the co-production of dissolving pulp,furfural,and lignin from ***-grade dissolving pulp was prepared from eucalyptus using a combination of extremely low acid(ELA)pretreatment,Kraft cooking,and elementary chlorine-free(ECF)*** obtained pre-hydrolysate was catalytic conversion into furfural in a biphasic system,and lignin during Kraft cooking and ECF was *** process condition was discussed as well as the mass flow *** results showed that ELA pretreatment could effectively remove 80.1%*** with traditional hydrothermal pretreatment,the ELA pretreatment significantly increased the xylose yield from 5.05 to 14.18 g/L at 170℃ for 2 h,which had practical significance for furfural *** 82.7%furfural yield and 82.9%furfural selectivity were obtained from xylose-rich pre-hydrolysate using NaCl as a phase modifier in a biphasic system with 4-methyl-2-pentanone(MIBK)as an organic phase by ion exchange resin catalysts at 190℃ for 2 ***,the pretreated eucalyptus was subjected to Kraft cooking,and the optimal alkali amount was 14%.Then,the Kraft pulp was bleached using the O-D1-EP-D_(2) sequence,and dissolving pulp was obtained with an ISO brightness of 86.0%,viscosity of 463 mL/g,andα-cellulose content of 95.4%.The Kraft lignin which has a potential application was investigated by 2D-HSQC NMR and 31P *** results showed that the S/G ratio of Kraft lignin was 1.93,and the content of phenolic hydroxyl groups was 2.53 mmol/***,based on the above proposed process,30.5 g dissolving pulp,5.5 g furfural,and 21.2 g lignin per 100 g eucalyptus chips(oven dry)were *** research will provide new catalysis and pulping technical routes for dissolving pulp,furfural,and Kraft lignin products,which are in great demand in the chemical industry.

关键词： Eucalyptus extremely low acid pretreatment dissolving pulp furfural kraft lignin

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Multi-channel photogenerated charge transfer in double S-scheme for promoting photostability and mineralization of pollutants

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Journal of Materials Science & Technology 2024年第35期202卷 67-81页

作者： Runlin Chen Lifeng Li Yufeng Gong Hongming Lou Yuxia Pang Dongjie Yang Xueqing Qiu School of Chemistry and Chemical Engineering Guangdong Provincial Key Lab of Green Chemical Product TechnologyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhou 510640China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China

Superior photo-mineralization of pollutants,outstanding charge separation efficiency and exceptional photostability of catalysts constitute three pivotal factors for the effective photodegradation of organic *** this study,a dual S-scheme In2 O3/Pedot/In2 S3(IO/Pedot/IS),inspired by natural photosyn-thesis,was successfully synthesized for the degradation of lignin and *** resulting exceptional semiconductor contact creates a dual-interface electric field on Pedot,facilitating multi-channel charge transport and enhancing charge separation *** establishment of the dual S-scheme hetero-junction raised the reduction-oxidation potential of the type-II In2 O3/In2 *** subjected to 5 W LED irradiation for 60 min,IO/Pedot-2/IS demonstrated a remarkable mineralization rate of 85.8%for sodium lignosulfonate(SL),surpassing the 53.7%mineralization rate achieved by IO/***,the degra-dation efficiency for tetracycline(TC)and ciprofloxacin(CIP)reached 91%and 88%,***,the hole(h+)conductivity of Pedot efficiently alleviated the photocorrosion of sulfide,ensuring robust cyclic *** simulations of natural photocatalysis showcased the exceptional versatility and applicability of IO/Pedot/***-depth analysis led to the proposal of a potential photodegradation pathway for lignin,based on the intermediates detected through liquid chromatography-mass spectrom-etry(LC-MS).Overall,this study presents an effective strategy for the efficient photocatalytic treatment of organic pollutants.

关键词： Photodegradation Lignin Pedot Photocorrosion Double S-scheme

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Efficient oxidation of monosaccharides to sugar acids under neutral condition in flow reactors with gold-supported activated carbon catalysts

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Frontiers of Chemical Science and engineering 2024年第9期18卷 113-123页

作者： Ziqin Gong Zengyong Li Xu Zeng Fengxia Yue Wu Lan Chuanfu Liu State Key Laboratory of Pulp and Paper Engineering School of Light Industry&EngineeringSouth China University of TechnologyGuangzhou 510640China Anhui Provincial Engineering Center for High Performance Biobased Nylons School of Materials and ChemistryAnhui Agricultural UniversityHefei 230036China

A significant reaction in the synthesis of biomass-based chemicals is the catalyst-based and targeted oxidation of monosaccharides into valuable sugar *** this study,an activated carbon supported gold catalyst was used to oxidize glucose and xylose to gluconic acid and xylonic acid under neutral *** of reaction conditions for the catalysts was performed using both a batch reactor and a flow-through *** a batch reactor,the yields of gluconic and xylonic acid reached 93%and 92%,respectively,at 90℃ within 180 *** a flow reactor,both reactions reached a similar yield at 80℃ with the weight hourly space velocity of 47.1 h^(-1).The reaction kinetics were explored in the flow *** oxidation of glucose and xylose to gluconic and xylonic acid followed a first-order kinetics and the turnover frequency was 0.195 and 0.161 s^(-1),*** activation energy was evaluated to be 60.58 and 59.30 kJ·mol^(-1),*** study presents an environmentally friendly and feasible method for the selective oxidation of monosaccharides using an activated carbon supported gold catalyst,benefiting the high-value application of carbohydrates.

关键词： monosaccharides oxidation gluconic acid xylonic acid flow reactor kinetics

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Achieving an ion-homogenizing and corrosion-resisting interface through nitro-coordination chemistry for stable zinc metal anodes

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Journal of Energy Chemistry 2024年第7期94卷 10-18页

作者： Jizhen Wang Long Jiao Qiaoyun Liu Wei Xin Yechen Lei Tian Zhang Leixin Yang Dengkun Shu Shuo Yang Kaihua Li Chenyang Li Chao Yi Hongyuan Bai Yuchao Ma Huan Li Wenjun Zhang Bowen'Cheng schoolof Light Industry Science and Engineering State Key Laboratory of Biobased Fiber Manufacturing TechnologyTianjin Key Laboratory of Pulp and PaperChina Light Industry Key Laboratory of Papermaking and BiorefineryTianjin University of Science&TechnologyTianjin 300457China Department of Materials Science and Engineering &Center of Super-Diamond and Advanced FilmsCity University of Hong Kong83 Tat Chee AvenueHong Kong 999077China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA 5005Australia

Suppression of uncontrollable dendrite growth and water-induced side reactions of Zn metal anodes is crucial for achieving long-lasting cycling stability and facilitating the practical implementations of aqueous Zn-metal *** address these challenges,we report in this study a functional nitro-cellulose interfacial layer(NCIL)on the surface of Zn anodes enlightened by a nitro-coordination chemistry *** NCIL exhibits strong zincophilicity and superior coordination capability with Zn^(2+)due to the highly electronegative and highly nucleophilic nature of the nitro functional *** characteristic facilitates a rapid Zn-ion desolvation process and homogeneous Zn plating,effectively preventing H_(2) evolution and dendrite ***,the negatively charged surface of NCIL acts as a shield,repelling SO_(4)^(2-)anions and inhibiting corrosive reactions on the Zn ***,reversible and stable Zn plating/stripping is achieved for over 5100 h at a current density of 1 mA cm^(-2),which is nearly 30 times longer than that of bare Zn ***,the Zn/V_(2)O_(5) full cells with the functional interface layer deliver a high-capacity retention of 80.3%for over 10,000 cycles at 5 A g^(-1).This research offers valuable insights for the rational development of advanced protective interface layers in order to achieve ultra-long-lifeZnmetal batteries.

关键词： Zinc metal anode Nitro-cellulose interfacial layer Coordination capability Dendrite-free deposition Long-term cycling

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Molecular scale behavior of xylan during solvent-controlled extraction and precipitation

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PHYSICAL CHEMISTRY CHEMICAL PHYSICS 2023年第41期25卷 28078-28085页

作者： Lin, Qixuan Zhan, Qiwen Wu, Yue Wang, Jianlin Li, Libo Xu, Feng Xu, Feng Ren, Junli State Key Laboratory of Pulp and Paper Engineering School of Light Industry and Engineering South China University of Technology Guangzhou 510640 China School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 China Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry University Beijing 100083 China

Solvent-controlled extraction and precipitation are the most fundamental methods for obtaining hemicellulose from lignocellulosic biomass and purification processes. However, the dissolution and precipitation mechanisms involved have scarcely been mentioned. In this study, the molecular scale behavior of xylan-type hemicellulose during solvent-controlled extraction and precipitation is investigated using molecular dynamics (MD) simulations and density functional theory (DFT) calculations. To bring the model closer to the real extracted xylan, a high degree of polymerization (DP100) of xylan is established, and hemicelluloses with low DP (DP15 and DP50) are also investigated. Four phenomena are explained at the molecular level, including the influence of the polymerization degree and side chain on the solubility of xylan in water, the improvement of the xylan's solubility in NaOH, the precipitation of xylan in ethanol, and the acetyl group preservation of xylan in DMSO. This study contributes to an increased understanding of the dissolution and precipitation mechanisms of hemicellulose and provides a resource for the simulation of high DP hemicellulose, which gives a theoretical basis for the efficient extraction of high-purity hemicellulose as well as economic biorefining.

关键词： Solvents

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Construction of interfacial dynamic bonds for high performance lignin/polymer biocomposites

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Frontiers of Chemical Science and engineering 2023年第10期17卷 1372-1388页

作者： Jianbin Mo Haixu Wang Mengzhen Yan Jianhua Huang Rui Li Danting Sun Junjie Lei Xueqing Qiu Weifeng Liu Guangdong Provincial Key Lab of Green Chemical Product Technology School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China

Lignin is the largest natural aromatic biopolymer,but usually treated as industrial biomass *** development of lignin/polymer biocomposites can promote the high value utilization of lignin and the greening of ***,the weak interfacial interaction between industrial lignin and polymer induces poor compatibility and serious agglomeration in polymer owing to the strong intermolecular force of *** such,it is extremely difficult to prepare high performance lignin/polymer ***,we proposed the strategy of in situ construction of interfacial dynamic bonds in lignin/polymer *** taking advantage of the abundant oxygen-containing polar groups of lignin,we inserted dynamic bonding connection such as hydrogen bonds and coordination bonds into the interphase between lignin and the polymer matrix to improve the interfacial ***,the natural amphiphilic structure characteristics of lignin were utilized to construct the hierarchical nanophase separation structure in lignin/polymer *** persistent problems of poor dispersity and interfacial compatibility of lignin in the polymer matrix were effectively *** lignin-modified polymer composites achieved simultaneously enhanced strength and *** concise review systematically summarized the recent research progress of our group toward building high-performance lignin/polymer biocomposites through the design of interfacial dynamic bonds(hydrogen bonds,coordination bonds,and dynamic covalent bonds)between lignin and different polymer systems(polar plastics,rubber,polyurethane,hydrogels,and other polymers).Finally,the future development direction,main challenges,and potential solutions of lignin application in polymers were presented.

关键词： lignin polymer interfacial dynamic bonds

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Development of Methylene Bis-Benzotriazolyl Tetramethylbutylphenol-grafted lignin sub-microspheres loaded with TiO_(2) for sunscreen applications

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Journal of Bioresources and Bioproducts 2024年第4期9卷 534-547页

作者： Yarong Li Zhiguang Tang Xiaohan Zhou Junhua Zhang Xueping Song Kai Li Wei Liu Zhanying Zhang College of Light Industry and Food Engineering Guangxi UniversityNanning530004China Province and Ministry Co-Sponsored Collaborative Innovation Center of Cane Sugar Industry Nanning530004China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Chemical EngineeringNanjing Forestry UniversityNanjing210037China Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control Nanning530004China Tianjin Key Laboratory of Pulp&Paper Tianjin University of Science&TechnologyTianjin300457China School of Mechanical Medical and Process EngineeringCentre for Agriculture and the BioeconomyQueensland University of TechnologyQueensland4000Australia

Lignin serves as a promising Ultraviolet(UV)absorber within sunscreen ***,the commercial development of lignin-containing sunscreens faces challenges due to their low sun protection factor(SPF)and dark color in cosmetics *** this study,dual modifications on the chemical and physical structures of lignin were conducted to address these ***,methylene bis-benzotriazolyl tetramethylbutylphenol(MBBT)was grafted onto alkali lignin(AL)through an atom transfer radical polymerization reaction,resulting in a polymer of AL-graft-MBBT_(3)(AL-g-MBBT_(3)).The sunscreen prepared with 10%AL-g-MBBT_(3) displays outstand-ing sun protection performance with a SPF of 42.93 and a light color with a color difference value(ΔE)of 45.6,in contrast to 10%AL with a SPF of 4.74 and aΔE value of ***,AL-g-MBBT_(3) was transformed into normal submicron spheres(AL-g-MBBT_(3) N)and TiO_(2)-loading submicron spheres(AL-g-MBBT_(3)/TiO_(2)).The sun protection performances of 10%AL-g-MBBT_(3) N@C and AL-g-MBBT_(3)/TiO_(2)@C sunscreens obviously surpass that of AL-g-MBBT_(3)@C sunscreen,achieving SPFs of 60.38 and 66.20,***,there is a considerable improve-ment in the color of these sunscreens,withΔE values of 41.8 and 36.3,*** results provide valuable insights into exploring lignin’s high-value applications in sunscreen.

关键词： Lignin Graft Submicron sphere TiO_(2) Anti-UV performance Color

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Dealuminated Hβ zeolite for selective conversion of fructose to furfural and formic acid

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Green Energy & Environment 2024年第2期9卷 311-320页

作者： Rui Li Qixuan Lin Junli Ren Xiaobao Yang Yingxiong Wang Lingzhao Kong State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of TechnologyGuangzhou510640China Institute of Coal Chemistry Chinese Academy of Sciences27 South Taoyuan RoadTaiyuan030001China CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai201210China School of Environmental Science and Technology Suzhou University of Science and Technology Suzhou Jiangsu215009China

The fructose-to-furfural transformation is facing major challenges in the selectivity and high efficiency. Herein, we have developed a simple and effective approach for the selective conversion of fructose to furfural using Hβ zeolite modified by organic acids for dealuminization to regulate its textural and acidic properties. It was found that citric acid-dealuminized Hβ zeolite possessed high specific surface areas, wide channels and high Brønsted acid amount, which facilitated the selective conversion of fructose to furfural with a maximum yield of 76.2% at433 K for 1 h in the γ-butyrolactone(GBL)-H_(2)O system, as well as the concomitant formation of 83.0% formic acid. The^(13)C-isotope labelling experiments and the mechanism revealed that the selective cleavage of C1–C2 or C5–C6 bond on fructose was firstly occurred to form pentose or C5 intermediate by weak Brønsted acid, which was then dehydrated to furfural by strong Brønsted acid. Also this dealuminized Hβ catalyst showed the great recycling performance and was active for the conversion of glucose and mannose.

关键词： Fructose Dealuminated-Hb zeolite Selective conversion Furfural

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