Carbohydrate Polymer Technologies and Applications
·
2022
·
IF 0
Xiwang Cao,Min Liu,Wentao Bi,Jun Lin,David Da Yong Chen
The surface of cellulose particles was carboxylated (2.44 mmol/g) in a deep eutectic solvent containing carboxylic acid. Based on the carboxyl content, the effects of key factors on cellulose carboxylation was systematically investigated. In addition, the reaction mechanism was studied by using liquid chromatography-mass spectrometry, and the influence of deep eutectic solvent containing carboxylic acid on the structure and physicochemical properties of cellulose during carboxylation was examined using different characterization techniques. The results showed that the type of carboxylic acid, cellulose particle size, and pretreatment methods significantly affect the carboxylation efficiency, degradation, and carbonization of cellulose. The internal crystal structure of cellulose did not change after the carboxylation reaction, while the surface crystal structure was destroyed by carboxylation, which greatly improved the dispersion and hydrophilicity properties of the product. The kinetics and thermodynamics of carboxyl cellulose adsorption were studied as well. Potential application of carboxyl cellulose in the adsorption of pollutants was demonstrated. This study provides a new method for the direct modification of cellulose in deep eutectic solvents, as well as a new sustainable strategy for modifying other materials.
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DOI
Journal of Materials Chemistry C
·
2013
·Vol. 1
·期 36
·5756-5764
·
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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DOI
Journal of Renewable and Sustainable Energy
·
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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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 42
·期 3
·1665-1672
·
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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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
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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DOI
高影响因子
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
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Shengbin Shi,Yuanfeng Wu,Mengting Zhang,Zongqi Zhang,Olayinka Oderinde,Lijing Gao,Guomin Xiao
The conversion of cellulose to levulinic acid (LA) and other platform chemicals is a promising route to solve the energy crisis. For this purpose, a series of new SO 3 H-functionalized ionic liquids (ILs), containing different halogen-anions were synthesized and applied for catalytic conversion of cellulose to LA. The structure, thermal stability, and acidity of SO 3 H-functionalized ILs were characterized by Nuclear magnetic resonance (NMR) spectra, Fourier-transform infrared (FT-IR), High resolution mass spectrometry (HRMS), thermogravimetric analysis (TGA), and Hammet acidity method. The results revealed that as the size of halogen anions increased, the Hammett acidity gradually increased from SO 3 H-functionalized ILs containing fluorine- to chlorine- and then to bromine-anions. When SO 3 H-functionalized ILs were used as a catalyst for the production of LA from cellulose, the yield of LA gradually increased as the size of halogen-anions increased from fluorine- to chlorine- and then to bromine-anions. Among the SO 3 H-functionalized ILs, 1,1-bis(3-(4-sulfobutyl)imidazolium-1-yl)butylene bromine ([BSim]Br) exhibited the best catalytic activity with 76.5% yield of LA in cellulose/[BSim]Br/H 2 O ( m / m / m = 1:9:8) reaction system at 180 °C for 20 min, which was the highest yield compared to previous literature reports using ILs as catalyst. Besides, the [BSim]Br was easily recovered and showed high catalytic activity after five cycles. The efficient catalyst, [BSim]Br is then proposed to have a great potential for mass production of LA from biomass.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Kai Zhang,Guihua Yang,Gaojin Lyu,Zhixin Jia,Lucian A. Lucia,Jiachuan Chen
Three nanocomposite catalysts such as Ru/graphene, WO3/graphene, and Ru–W18O49/graphene were synthesized by solvothermolysis to increase the ethylene glycol (EG) yield from the hydrothermal conversion of cellulose. The morphology and composition of the nanocomposites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, Brunauer–Emmett–Teller, scanning electron microscopy, and transmission electron microscopy. The results showed a new nanocomposite made up of graphene nanosheets that supported in situ growth of Ru nanoparticles with an average size of ∼7 nm and W18O49 nanowires with an average diameter of ∼5 nm. Compared to Ru/graphene and WO3/graphene nanocomposites, Ru–W18O49/graphene showed nearly unit conversion of cellulose at a yield of 62.5% of EG when the reaction was carried out at 245 °C for 60 min. Moreover, it could be used at least three times with the high yield of EG in the range of 48.7–62.5%; however, with the increase of recycled runs, the tungsten species on the surface of graphene would be slowly dissolved in the aqueous solution and then the selectivity of this catalyst would gradually decrease. Besides, the one-pot solvothermal synthesis enabled reduction of Ru ions, graphene oxide, and growth of W18O49 nanowires to thus provide a simple approach for the preparation of the graphene-based nanocomposite catalysts.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 11
·7213-7225
·
IF 5.044
Zhang Jing,Bao Yan,Guo Mingyuan,Peng Zhenghua
Poor water solubility of cellulose acetate is a key factor limiting its application in leather finishing field. Herein, a self-emulsifying aqueous emulsion was synthesized by using cellulose diacetate (CDA) as the substrate, dimethylolbutyric acid (DMBA) as the hydrophilic agent, and hexamethylene diisocyanate (HDI) as the bridging agent. Because the flexible carbon chain of HDI has the advantages of easy bending and deformation, the problem of large steric hindrance and low reactivity of -OH during water-based CDA can be solved by using the method of converting reactive functional groups and transferring reactive sites. At the same time, the flexible molecule 1,4-butanediol (BDO) and propylene glycol polyether (N210) are used as chain extenders to increase the molecular stretch and curl ability by adjusting the ratio of molecular soft and hard segments, and improve emulsion stability and coating flexibility. And through the reaction of -NH 2 and -NCO on the surface of nano SiO 2 modified by KH550, the nano SiO 2 is evenly distributed in the CDA water-based polymer to improve the comprehensive performance of the emulsion coating. Thus the nano-SiO 2 modified cellulose acetate water-based polymer emulsion (SiO 2 /WCDA) is obtained for leather finishing. The emulsion particles show an oil-in-water (O/W) core–shell structure, and the average particle size and dispersion coefficient (PDI) of the particles are 88.79 nm and 0.150, respectively. The surface of the coating film is compact, flat, and hydrophobic, with the contact angle is 104.3 °. In addition, the coating film has good adhesion, water resistance, heat resistance, yellowing resistance, chemical resistance, flexibility and mechanical properties.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 3
·1587-1597
·
IF 5.044
Liu Xiaohong,Li Ming,Zhang Haichuan,Chen Liheng,Fu Shiyu
A cellulose- grafted -poly( N -isopropylacrylamide) (cellulose- g -PNIPAAm) copolymer with thermo-responsivity was synthesized using homogeneous activators regenerated by electron transfer for atom transfer radical polymerization (ARGET-ATRP). The prepared copolymer dispersed at low concentration in water or phosphate-buffered saline (PBS) at 25 °C could self-assembly into micelles at 37 °C. The size and morphology of these micelles were determined by dynamic light scattering and transmission electron microscopy. The copolymer at a concentration over 4.2% by weight in water formed an injectable thermo-responsive hydrogel that was composed of micelles when the temperature increased to 37 °C. This hydrogel was used to load the anticancer drug doxorubicin (DOX). In vitro release studies demonstrated that this hydrogel released DOX in a sustained manner. Furthermore, this cellulose-based injectable thermo-responsive hydrogel was used in cytotoxicity tests, revealing that it was very biocompatible. Based on the above results, this cellulose- g -PNIPAAm injectable thermo-responsive hydrogel has strong potential for application in smart drug delivery systems.
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 8
·4439-4453
·
IF 6.123
Li Yinan,Li Huixin,Huang Jin,Huang Liulian,Chen Lihui,Ni Yonghao,Zheng Qinghong
A highly transparent ZnO/cellulose composite membrane with UV sensing and shielding abilities was prepared via a facile blending method. ZnO nanoparticles (ZnO NPs) without additional surface modification are uniformly dispersed in the regenerated cellulose (RGC) matrix through the N-methyl-morpholine-N-oxide (NMMO) dissolution of cellulose. Agglomeration of the ZnO NPs is effectively minimized, thanks to the strong hydrogen bonds between ZnO NP and cellulose. The optimized ZnO/RGC membrane exhibits not only high a shielding ratio of 97.67 ± 0.11% for UV lights (< 360 nm) but also high transparency of 87.12±1.55% in the visible light region, which is comparable to traditional plastic products. Benefiting from the high photoelectric performance of ZnO NPs, a UV sensor and a UV blocker were integrated into the same device. The as-fabricated ZnO/RGC membrane, with sensitive UV detecting and effective blocking, as well as the rich availability of cellulose as raw material and its biodegradable nature, is an ideal candidate for high-performance UV detection and protection applications. Graphical abstract
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DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 17
·9255-9268
·
IF 3.917
Liu Yixin,Liu Lin,Li Zhen,Zhao Yinan,Yao Juming
Abstract Novel, flexible, smart cellulose nanocomposite plates were fabricated by coating graphene nanoplate (GnPs) solution on the surface of cellulose sol, followed by hot pressing, in which GnPs was directly exfoliated and dispersed by PVP as exfoliating and dispersing agent. The structure, properties, and dual sensing (strain and pressure) of the resultant cellulose/GnPs nanocomposite plates (CGP) were systematically investigated. The formed conductive graphene network within the cellulose substrate, and the strong interfacial adhesion between cellulose and GnPs endowed the CGP excellent electromechanical properties, i.e. low electrical resistance (< 270 Ω cm), stable sensitivity on strain (GF 5.87) and pressure (S 0.037 kPa −1 ), good durability (> 1000 loading/unloading cycles). This work provided a green and facile approach to fabricate smart cellulose sensor responding to different external stimuli like stretch and compress by electrical resistance changes. Graphic abstract
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DOI
高影响因子
危险品化学品经营许可证（带存储）