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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°C within 180 *** a flow reactor,both reactions reached a similar yield at 80°C 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

风险厌恶和信息获取对养殖户现代化经营理念的影响

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西北农林科技大学学报（社会科学版） 2024年第4期24卷 143-152页

作者：赵立夫刘传福曹建民吉林农业大学经济管理学院长春科技学院经济与管理学院长春130000

基于对全国367个肉牛养殖户微观调研数据,从创新、协调、绿色、开放、共享5个维度10个指标,运用熵值法测算养殖户现代化经营理念水平,在此基础上,利用Tobit回归模型分析风险厌恶程度和信息获取能力对养殖户现代化经营理念的影响。结果表... 详细信息

基于对全国367个肉牛养殖户微观调研数据,从创新、协调、绿色、开放、共享5个维度10个指标,运用熵值法测算养殖户现代化经营理念水平,在此基础上,利用Tobit回归模型分析风险厌恶程度和信息获取能力对养殖户现代化经营理念的影响。结果表明:目前养殖户现代化经营理念较低;风险厌恶程度对养殖户现代化经营理念具有显著的负向影响,信息获取能力对养殖户现代化经营理念具有显著的正向影响,信息获取能力可以有效缓解风险厌恶对养殖户现代化经营理念的抑制作用;此外,受教育程度、当地有肉牛合作社和年参加培训次数等因素对养殖户现代化经营理念也有显著的正向影响。据此,提出促进养殖户现代化经营理念提升的政策建议。

关键词：风险厌恶信息获取养殖户熵值法现代化经营理念

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Therapeutic effect of naloxone on radiation optic neurapathy Based on rabbit models

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Neural Regeneration Research 2007年第8期2卷 475-478页

作者： Ruibin liu chuanfu Wang Ophthalmology Center Union Hospital Changzhi Medical College Changzhi 046000 Shanxi Province China

BACKGROUND： Radiation therapy is widely used to treat tumor of brain; however, irradiation of radiation into eye tissues may easily cause ischemia and hypoxia in retina and optic nerve tissue so as to induce radiation optic neurapathy. Noloxone is a specific antagonist of opiate receptor, and it can change injured effect of f3 -endorphin. OBJECTIVE： To observe the axoplasmic transport of optic nerve at various phases after radiation injury so as to investigate the mechanism and regularity of optic nerve injury; meanwhile, to verify the therapeutic effects of naloxone on radiation optic neurapathy. DESIGN： Randomized controlled animal study. SETTINGS： Medical College of Qingdao University, Changzhi Medical College. MATERIALS： A total of 40 healthy adult New Zealand rabbits, weighing 2 - 2.5 kg, of either gender, were checked by using slit lamp and ophthalmoscop before radiation in order to exclude eye diseases. FCC-7000 vertical kilocurie ^60Co therapeutic machine was made in Yantai, China; in addition, naloxone was provided by Beijing Sihuan Pharmaceutical Factory. METHODS： The experiment was carried out in the Animal Experimental Laboratory, Medical College of Qingdao University from January 2005 to December 2006. The experimental rabbits were randomly divided into radiation group （n =16）, treatment group （n =16）, blank control group （n=4） and injured control group （n=4）. Except blank control group, rabbits in other three groups were irradiated in as the center of optic chiasma including the area of optic nerve by using ^60Co therapeutic machine. Radioactive source was 85 cm away from head, and the size of operative field was 5 cm × 5 cm. The radiation was performed once a day with the dosage of 3 Gy for 8 days in total. The total dosage was 24 Gy. When radioactive dosage reached 24 Gy, 2 mg/kg naloxone was dropped into ear vein of rabbits in the treatment group once a day for 10 days in total. Rabbits in the injured control group were only irradiated but not given

关键词： naloxone optic nerve injuries radioactivity

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木质素基非异氰酸酯聚氨酯的研究进展

中国造纸学报 2024年第2期39卷 115-124页

作者：吴泽琪罗敏蓝武苏振华刘传富田超华南理工大学轻工科学与工程学院制浆造纸工程国家重点实验室广东广州510640 中国制浆造纸研究院有限公司北京100102 制浆造纸国家工程实验室北京100102

聚氨酯(PU)是用途广泛的聚合物材料之一。目前,以生物质资源为原料,合成非异氰酸酯聚氨酯(NIPU)的技术受到越来越多的关注。木质素是自然界中储量丰富的天然可再生芳香族聚合物,功能化木质素可用于替代不可持续的石油基原料,开发高附加... 详细信息

聚氨酯(PU)是用途广泛的聚合物材料之一。目前,以生物质资源为原料,合成非异氰酸酯聚氨酯(NIPU)的技术受到越来越多的关注。木质素是自然界中储量丰富的天然可再生芳香族聚合物,功能化木质素可用于替代不可持续的石油基原料,开发高附加值的NIPU产品。本文综述了近年来以木质素为原料合成NIPU的方法和策略,介绍了利用木质素及其功能化衍生物合成木质素基NIPU的研究进展,并展望了木质素基NIPU在泡沫材料、木材黏合剂、弹性体、涂料等相关领域的应用潜力。

关键词：木质素非异氰酸酯聚氨酯改性生物基材料

Quaternized chitosan-assisted in situ synthesized CuS/cellulose nanofibers conductive paper for flexible electrode

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Nano Research 2021年第7期14卷 2390-2397页

作者： Xiujie Huang Bichong Luo chuanfu liu Linxin Zhong Dongdong Ye Xiaoying Wang State Key Laboratory of Pulp and Paper Engineering South China University of Technology381 Wushan RoadGuangzhou 510640China School of Textile Materials and Engineering Wuyi UniversityJiangmen 529020China

Cellulose nanofibers(CNF)are considered to be a potential substrate of energy material for energy storage devices due to the foldable,lightweight,recyclable and environmentally friendly ***,the energy materials tend to distribute unevenly or fall off from CNF easily,resulting in the decrease of the devices’overall ***,for the first time,we used quaternized chitosan(QCS)as stabilizer and adhesive to in situ synthesize and deposite copper sulfide nanocrystals(CuS-NCs)on CNF and further obtained the conductive paper for flexible *** the presence of QCS,CuS-NCs deposited in situ on CNF can be capped and stabilized by the QCS molecular chains for uniform distribution,which is conducive to the capacitive behavior and electrochemical stability of composite *** result shows that the specific capacitance of the composite paper was as high as 314.3 F/g at a current density of 1 A/g,a high rate capacitance of 252.6 F/g was achieved even at a high current density of 10 A/*** reveals that the composite paper exhibited better electrochemical performance than many other CuS-based electrode materials for *** importantly,the composite paper performed well in various folding state without changing much electrochemical ***,this work provides a novel strategy to in situ fabricate paper-based electrode for nextgeneration flexible energy-storage system.

关键词： copper sulfide nanocrystals cellulose nanofiber quaternized chitosan supercapacitors flexible devices

Biomass-based N doped carbon as metal-free catalyst for selective oxidation of D-xylose into D-xylonic acid

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Green Energy & Environment 2022年第6期7卷 1310-1317页

作者： Zengyong Li Yiming Huang Xiao Chi Di Li Linxin Zhong Xuehui Li chuanfu liu Xinwen Peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou510640China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640China

Rational design and facile preparation of low-cost and efficient catalysts for the selective converting of biomass-derived monosaccharides into high value-added chemicals is highly demanded,yet ***,we first demonstrate a N doped defect-rich carbon(NC-800-5)as metal-free catalyst for the selective oxidation of D-xylose into D-xylonic acid in alkaline aqueous solution at 100℃ for 30 min,with 57.4%*** doped graphitic N is found to be the active site and hydroxyl ion participating in the oxidation of *** ion and D-xylose first adsorb on NC-800-5 surface,and the aldehyde group of D-xylose is catalyzed to form germinal diols ***,C–H bond break to yield carboxylic ***,NC-800-5 catalyst shows high stability in recycled test.

关键词： Biomass carbon Metal-free catalysts D-xylose Sugar acid Selective oxidation

合成碳酸钙分散稳定性调控及其对纸质文献脱酸效果研究

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中国造纸 2024年第8期43卷 64-73页

作者：赵赫何贝曹显刘传富樊慧明汤栋霖赵丽红任俊莉华南理工大学轻工科学与工程学院制浆造纸工程国家重点实验室广州市岭南文献保护研究中心广东广州510640 陕西师范大学材料科学与工程学院历史文化遗产保护教育部工程研究中心陕西西安710119 华南理工大学材料科学与工程学院广东广州510640

本研究提出了以甲基纤维素为分散助剂,对合成碳酸钙分散体系的粒径和分散稳定性进行调控的研究策略;并将合成碳酸钙分散体系应用于酸化纸质文献脱酸处理,并进行耐老化性能评估。研究发现,黏度为1500 mPa·s的甲基纤维素与氢氧化钙以质量... 详细信息

本研究提出了以甲基纤维素为分散助剂,对合成碳酸钙分散体系的粒径和分散稳定性进行调控的研究策略;并将合成碳酸钙分散体系应用于酸化纸质文献脱酸处理,并进行耐老化性能评估。研究发现,黏度为1500 mPa·s的甲基纤维素与氢氧化钙以质量比1∶4在二氧化碳氛围中合成的碳酸钙分散体系具有最佳分散稳定性,碳酸钙的平均粒径为108 nm,静置5天仍保持稳定分散。碳酸钙分散体系处理后的旧书纸张的冷抽提pH值从4.7提升到7.7,碱储量为1.95%碳酸钙当量;经过湿热加速老化14天后,脱酸旧书纸张的冷抽提pH值仍保持7.5,碱储量为1.70%碳酸钙当量;脱酸处理后的旧书纸张机械性能明显高于未处理组,色差<1,对字迹油墨无影响,表明该体系对纸质文献具有优异的脱酸性能,并可赋予其耐老化性能。

关键词：纸质文献保护脱酸合成碳酸钙甲基纤维素

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五种野生竹材纤维形态及化学成分分析

造纸科学与技术 2024年第4期43卷 11-16页

作者：吴峥李维英岳凤霞任俊莉李海龙刘传富华南理工大学轻工科学与工程学院制浆造纸工程国家重点实验室广东广州510640

研究了吊丝竹、梁山慈、四川硬头黄、粉单竹和斜杆思劳竹的纤维形态和化学组成,发现在纤维形态上几种竹子的重量加权长度都大于1.5 mm,纤维长宽比在90~160之间,纤维细胞狭长,是优良的造纸原料。对比化学组成,梁山慈的综纤维素含量最高(6... 详细信息

研究了吊丝竹、梁山慈、四川硬头黄、粉单竹和斜杆思劳竹的纤维形态和化学组成,发现在纤维形态上几种竹子的重量加权长度都大于1.5 mm,纤维长宽比在90~160之间,纤维细胞狭长,是优良的造纸原料。对比化学组成,梁山慈的综纤维素含量最高(64.70%),抽出物(4.35%)、灰分(1.23%)含量较低。进而研究了NaOH-戊醇两相预处理对梁山慈竹分离得到的半纤维素和木质素的化学结构和性质的影响,发现预处理得率、纤维素保留率随着温度上升而下降,半纤维素和木质素脱除率随温度上升而提高。分离的木质素和半纤维素分子量较高,半纤维素主要为阿拉伯木聚糖,含有4-O-甲基葡萄糖醛酸,木质素为典型的竹材HGS型木质素。

关键词：野生竹材化学成分纤维形态两相预处理木质素半纤维素

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改性磁性生物质炭对酸性橙7的吸附

南昌大学学报（理科版） 2024年第1期48卷 42-51页

作者：刘传福张晨吴正德张健於中烨陈宏彬邱祖民南昌大学化学化工学院江西南昌330000 江西开放大学数字经济学院江西南昌330000

以竹粉水热炭(BC)作为基底,负载Fe 3O 4磁性材料使其具有磁性,同时经共沉淀法在磁性水热炭表面生长层状双氢氧化物(LDH)来提升吸附性能。将制备的材料用于吸附酸性橙7,探究了不同pH、离子浓度、水质、微塑料、腐殖酸等因素的影响,并通过... 详细信息

以竹粉水热炭(BC)作为基底,负载Fe 3O 4磁性材料使其具有磁性,同时经共沉淀法在磁性水热炭表面生长层状双氢氧化物(LDH)来提升吸附性能。将制备的材料用于吸附酸性橙7,探究了不同pH、离子浓度、水质、微塑料、腐殖酸等因素的影响,并通过SEM、BET、XRD、FT-IR、VSM等表征手段,分析了吸附过程的机理。结果表明:吸附符合Langmuir模型和准二阶动力学模型。在40℃下,平衡吸附量能达到271.64 mg·g^(-1),该吸附剂具有较好的循环吸附效果,循环4次仍具有较好的去除率。

关键词：吸附水热炭层状双氢氧化物(LDH) 酸性橙7