INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Xinyu Zhang,Wenyuan Zhu,Jiaqi Guo,Junlong Song,Huining Xiao
The degree of substitution (DS) of cellulose derivative is significantly associated with its properties. In this paper, a series of quaternary cellulose (QC) samples with different DS (ranging from 0.16 to 0.51) were synthesized with assistance of microwave and their relationship with strength improvement of fiber networks was investigated systematically. QCs were characterized by elemental analysis, FT-IR, 1 H NMR, and TGA , etc. The results showed that the cationic quaternary ammonium salt group was successfully grafted onto the backbones of cellulose chains and the thermal stability was associated inversely with the DS of QCs. However, the results of strength test for the fiber networks from secondary fiber of old corrugated containers showed that the tensile and burst strength was enhanced by addition of QCs, and their performance was positively correlated their DS. The best result achieved in this investigation was in the case of QC with DS of 0.51, with increments of tensile and burst strength 6.17% and 11.68%, respectively, at a dosage of 1.0 wt% based on oven-dry pulp. This investigation highlights the importance of DS of QC to its application in strength improvement for fiber networks.
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高影响因子
Journal of Renewable and Sustainable Energy
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2017
·Vol. 9
·期 2
·
IF 1.135
Xiao Zhuqian,Mao Jianwei,Jiang Chengjun,Xing Chuang,Ji Jianbing,Cheng Yongjie
The direct hydrogenolysis of cellulose on bimetallic catalysts represented a promising route for polyols' production. The development of a catalyst system that could control the promotion of the selectivity of polyols for the conversion cellulose into polyols was highly desirable. In this work, we realized the production of ethylene glycol (EG) and 1,2-propylene glycol (1,2-PG) by adopting nano-Sn species with different valences in combination with Ni catalysts, and the catalysts were prepared by the incipient-wetness impregnation method. The catalyst 10%Ni–15%Sn/SBA-15 achieved the highest yield of C 2 -C 3 polyols, yielding up to 67.2% with a higher selectivity to 1,2-PG. The Ni and Sn species and some NiSn alloys were found to be the active sites for the EG and PG as evidenced by control experiments and characterization including X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. The catalytic particles were located on the outer surface of SBA-15 (pore size = 6–10 nm) on a nanoscale with sizes of 11.1 ± 1.9 nm. The effects of the supports and hydrogenating species were investigated for cellulose conversion. The experimental results disclosed that the Sn species with different valences possessed obvious functions for the retro-aldol condensation, and the Ni components boomed the hydrogenation process. The other detailed analyses on the formation of polyols were described. As a consequence, controlling the EG and PG product distribution could be realized using Sn based catalysts.
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Journal of Materials Chemistry C
·
2013
·Vol. 1
·期 36
·5756-5764
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IF 0
Lingzhi Zhang,Chengcheng Zhao,Jinping Zhou,Tetsuo Kondo
Amphiphilic cationic cellulose derivatives with different long alkyl chains as hydrophobic segments were synthesized. They can self-assemble into cationic micelles in distilled water. The structure and properties of the micelles were characterized by elemental analysis, FT-IR, 1H NMR, ζ-potential measurements, DLS, TEM, and fluorescence spectroscopy. The hydrophobic cores of the micelles were used to load a hydrophobic dye (4,7-bis[4-(1,2,2-triphenylvinyl)phenyl]benzo-2,1,3-thiadiazole, BTPETD) and exhibited a stable photoluminescence. The fluorescence emission can quantitatively and sensitively respond to 2,4-dinitrophenol (DNP) and picric acid (PA) due to the electron transfer between BTPETD and the explosives, and the limit of detection was 200 and 50 nM for DNP and PA, respectively. The novel hydrophobically modified cationic cellulose micelles have the potential to prepare feasible, sensitive and stable sensor systems for detecting explosives in aqueous solutions.
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NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 42
·期 3
·1665-1672
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IF 3.269
Lin Tan,Zhaojun Tan,Huixia Feng,Jianhui Qiu
Herein, a new strategy was developed to fabricate an oriented cellulase/chitosan/Fe3O4 composite, which possesses extremely high activity, reusability, and stability. Compared to the conventional methods, herein, cellulase was first mixed with cellulose; this allowed the active-centers of cellulase to combine with cellulose tightly. Then, the cellulase/cellulose mixture was immediately embedded into chitosan (CS) layers, which were coated with Fe3O4 nanoparticles. After hydrolyzing the cellulose, a flexible hollow structure was obtained. The activity of immobilized cellulase was still maintained over 50% even after 15 uses; this indicated that the composite we fabricated herein possessed much higher activity and reusability as compared to those reported in other studies. The promising stability and activity of the immobilized cellulase is very important for practical applications.
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高影响因子
CARBOHYDRATE POLYMERS
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2017
·
IF 4.811
Yeqiang Lu,Yue Wang,Lejing Liu,Weizhong Yuan
Ethyl cellulose (EC), owing to its wide availability, environmental-friendliness, and intrinsic hydrophobicity/oleophilicity, was used as an absorbent material for the first time. The superhydrophobic magnetic EC sponges with low density and high porosity were facilely prepared via freeze-drying method. The superhydrophobicity and magnetism of the sponges were achieved by silanization EC with hexadecyltrimethoxysilane and mixing with ferroferric oxide (Fe 3 O 4 ) nanoparticles. The as-prepared magnetic silanized EC (MSEC) sponges showed stable superhydrophobicity ( θ water > 150°, rolling contact angle: 7°) in several kinds of solutions. Furthermore, the sponges exhibited high separation efficiency and good mass absorption capacity for a wide variety of oils and organic solvents (37–51 times of their own weight). Benefitting from the robust superhydrophobicity and good self-cleaning property of the sponges, the absorption capacity could be well maintained upon repeated use, demonstrating the superior recyclability. These advantages made the sponges ideal absorbents for oil spillage cleanup.
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Polymers
·
2021
·Vol. 13
·期 20
·3463
·
IF 4.329
Juntao Yan,Jinhong Liu,Ya Sun,Guangsen Song,Deng Ding,Guozhi Fan,Bo Chai,Chunlei Wang,Linbing Sun
Rice straw-derived cellulose (RSC) with purity of 92 wt.% was successfully extracted from rice straw by a novel and facile strategy, which integrated the C2H5OH/H2O autocatalytic process, dilute alkali treatment and H2O2bleaching process. Influencing factors of the cellulose extraction were systematically examined, such as ethanol concentration, alkali concentration, H2O2bleaching process and so on; the optimal extraction conditions of cellulose was determined. A series of rice straw-derived cellulose acetate (RSCA) with different degree of substitution (DS) were prepared by the acetylation reaction; the effects of Ac2O/cellulose ratio, reaction temperature and reaction time on the acetylation reaction were investigated. Results of FTIR and XRD analysis demonstrated that highly purified RSC and RSCA were prepared comparing with the commercial cellulose and cellulose acetate. Solubility analysis of RSCA with different DS indicated as-prepared RSCA with DS of 2.82 possessed the best solubleness, which was suitable for electrospinning. Moreover, the flexible RSCA fibrous membrane was easily fabricated by a facile electrospinning method. Our proposed method provided a strategy for realizing the high-value utilization of waste rice straw resource, as prepared RSC and RSCA can be used as chemical raw material, and electrospun RSCA fibrous membrane has various applications in medical materials, food packaging, water purification and so on.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Jin Yang,Jiuyun Cui,Atian Xie,Jiangdong Dai,Chunxiang Li,Yongsheng Yan
The oily wastewater has been widely concerned owing to growing industrial wastewater and marine pollution. Herein, a cellulose-based oil/water separation membrane was fabricated using a very simple alternating soaking process (ASP). First, the sodium alginate was coated on the cellulose membrane surface (filter paper), and then CaCO 3 particles were assembled onto the membrane surface through ASP, finally we can get the superhydrophilic/underwater superoleophobic cellulose membrane (FP@SA/CaCO 3 ) for oil/water separation. The underwater oil contact angle (OCA) of FP@SA/CaCO 3 is 151.1°, which indicated that FP@SA/CaCO 3 has good underwater superoleophobicity. Moreover, for different oil/water mixtures, the FP@SA/CaCO 3 membrane has outstanding separation efficiency of over 99.2 % and the flux of over 400 L m −2 h −1 . Besides, even after 20 reuse, FP@SA/CaCO 3 still showed a high flux and separation efficiency, indicating FP@SA/CaCO 3 has good reusability. The FP@SA/CaCO 3 membrane with low cost and high performance shows a good application market for oily wastewater remediation in the future.
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高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Ling Yan,Lei Wang,Shengjie Gao,Changhong Liu,Zhengzhu Zhang,Aijin Ma,Lei Zheng
The feasibility of using celery cellulose hydrogels as carriers was explored for controlled release of short-chain fatty acids (SCFAs) triggered by ultrasound. The hydrogels were prepared with the phase inversion method and further characterized using FT-IR, SEM and XRD techniques. At the optimal cellulose concentration (8.33 and 6.25 mg/mL), the hydrogels (F 4 and F 5 ) exhibited the swelling ratio of 185%, and Young’s modulus of the F 4 and F 5 was lower than that of others. The hydrogels were loaded with SCFAs owing to its hydrophilicity and swelling properties, and the maximum loading capacity of SCFAs achieved nearly 80%. Interestingly, the loaded SCFAs within hydrogel carrier could be readily released if an ultrasound trigger is exerted. Our results indicate that the ultrasound-triggered strategy for the SCFAs delivery system could provide a promising basis to achieve on-demand, reproducible, repeated, and tunable dosing of bioactive molecules.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Shengdu Yang,Xin Sun,Junqi Shen,Yi Li,Lan Xie,Shuhao Qin,Bai Xue,Qiang Zheng
High thermal resistance frequently occurring at both filler–matrix and filler–filler interfaces lays down paramount bottlenecks for thermal management materials (TMMs). Herein, pony-size silver (Ag, 2–8 nm) nanoparticles are first constructed on nanodiamonds (NDs) with the assistance of environment-friendly polydopamine (PDA), which is rather different from larger Ag nanoparticles (AgNPs, 10–25 nm) simply deposited on NDs. Such ternary heterostructures impart low interfacial thermal resistance in cellulose nanofiber (CNF) composites and thereby allow high thermal conductivity but electric insulation. It is worth noting that the interfacial thermal resistance of CNF/Ag-PDA-ND (4.11 × 10–7 m2 K W–1) is exceptionally 1–2 orders of magnitude lower than those of CNF/Ag-ND (7.28 × 10–6 m2 K W–1) and CNF/ND (5.14 × 10–5 m2 K W–1) mainly due to the improved contact area between NDs assisted by PDA-Ag and even the bridging effect of AgNPs between NDs and CNFs. Of particular interest is our first establishment of an excellent heat interface (94.4% reduction in interfacial heat resistance) by introducing environment-friendly PDA during the metallization process rather than the reducing agent. With the appearance of such ternary heterostructures, the in-plane thermal conductivity of CNF/Ag-PDA-ND composite papers is high up to 16.36 W m–1 K–1 with about 1202% enhancement, compared to that of pure CNF. Meanwhile, the flexible CNF/Ag-PDA-ND composite papers are also endowed with high strength and toughness. Therefore, interfacial engineering can be extended to diverse materials (e.g., metallic oxides, carbon, and polymers) and can open creative avenues for sustainable high-performance TMMs in advanced high-power electronics.
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CATALYSIS LETTERS
·
2019
·Vol. 150
·期 1
·138-149
·
IF 2.372
Wang Xiaohui,Wu Xiao,Guo Kunmao,Ren Junli,Lin Qixuan,Li Huiling,Wang Xiaohui,Liu Shijie
Abstract A feasible approach was developed to quickly hydrolyze microcrystalline cellulose (MCC) into glucose using a new carbon-based solid catalyst (CSC). The catalysts possessed the structure of mesoporous carbon with weak acidic carboxylic and phenolic groups. 83.94% yield of glucose was achieved at 200 °C for 50 min using mixed ball milling of MCC and CSC. The catalysts showed excellent recyclability and catalytic activity after five cycles. Graphic Abstract
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Jin Wang,Kaitao Zhang,Lei Zhang,Zhanqian Song,Shibin Shang,He Liu,Dan Wang
In this work, short rod-like cationic cellulose nanocrystals (AH-CNCs) were prepared by sodium periodate oxidation combined with deep eutectic solvent method. The effects of different content AH-CNCs on the properties of the emulsion were studied. With the increase of AH-CNCs content, the diameter of emulsion droplets decreased and the stabilization time prolonged. The electrostatic attraction between the negative charge accumulated at the oil-water interface and AH-CNCs with positive charge improved the stability of the emulsion. Then, the rheological properties showed the interaction of nanocellulose in the continuous phase increased the viscosity of the emulsion. In addition, the droplet diameter of emulsion of 120 s was smaller at different ultrasonic time, the particle size distribution of emulsion changed from monodisperse to polydisperse with the increase of oil volume, the salt concentration had little effect on the droplet size of emulsion, and the preparation of emulsion under acidic conditions was more stable.
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CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Yixi Wang,Zhicun Wang,Keliang Wu,Jianning Wu,Guihua Meng,Zhiyong Liu,Xuhong Guo
Novel antibacterial double-network (DN) hydrogels with superior mechanical and self-healing properties are developed via the UV-initiated copolymerization of polyacrylic acid (PAA)-grafted quaternized cellulose (QCE) and polyvinyl alcohol (PVA). The QCE functioned as an antibacterial agent, resulting in excellent antibacterial capability (antibacterial rate >93%). The hydrogels are thus protected from microbial attack in natural environments, prolonging their lifetime. The PVA functioned as a physical cross-linker, resulting in superior mechanical properties. At PVA and QCE contents of 8% and 1.5%, respectively, the strain and stress at break of hydrogel were 465.37% and 1.13 MPa, respectively. The hydrogel maintained good self-healing properties owing to ionic bonding between the ferric ions and carboxylic groups, and hydrogen bonding between the PVA molecules. The hydrogel was responsive to pH; its water-holding ability could be controlled by changing the pH. The material is simply prepared and used. Hydrogels with such excellent properties could be applied in various biomedical fields.
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高影响因子
危险品化学品经营许可证（带存储）