CELLULOSE
·
2021
·Vol. 28
·期 11
·7243-7256
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IF 5.044
Lu Xinyu,Que Han,Guo Haoquan,Ding Chenrong,Liu Xu,Qin Yu,Robin Hossain Mahmud,Xu Chaozhong,Gu Xiaoli
Abstract A homogeneous α -cellulose film was prepared by a regeneration method from ZnCl 2 /CaCl 2 /cellulose mixed system and was further combined with sodium lignosulfonate (SLS) via crosslinking through intermolecular hydrogen bonds and “bridge linkages”. The physicochemical and antibacterial performance of prepared films were investigated and results showed that the modified film exhibited stronger tensile strength, higher thermal stability, lower hydrophilic effect, better UV shielding as compared with the original one, and especially, better antibacterial ability derived from the presence of phenolic hydroxyl and sulfonate groups in SLS. This study proposed a simple and sustainable method for fabricating a multifunctional and environmentally friendly composite film using two main lignocellulose resources as raw materials. Graphical abstract
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高影响因子
Carbohydrate Polymer Technologies and Applications
·
2021
·
IF 0
Xin Bao,Chunhong Wang,Zhenyu Zhang,Qinghua Cao,Fei Liu,Jing Chen,Chuanzhi Zhang,Haining Na,Jin Zhu
In this article, three kinds of cellulose carbonated derivatives are synthesized by modifying cellulose with alkyl halides (namely bromopropane, benzyl bromide and bromomethyl cyclopropane) in DBU/DMSO/CO2 system. The wet spinnability and filament properties of the obtained cellulose carbonated derivatives are investigated. Through rheological analysis, the solutions of various cellulose carbonated derivative in Newtonian fluid state can show good wet spinnability. Filaments with smooth surface and uniform morphology can be obtained from the solution with viscosity over 0.07Pa•s. The cellulose carbonated derivatives in the filament show similar in tight orderly rows. Among them, the cellulose propyl carbonated derivative filament exhibits the highest mechanical properties and heat resistance. By using of DBU/DMSO/CO2 system, the wet spinning and key control condition of cellulose carbonated derivatives are combined to achieve for the formation of filament with uniform morphology.
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CELLULOSE
·
2021
·Vol. 28
·期 9
·5241-5256
·
IF 5.044
Zhou Qian,Chen JunJie,Jin Bo,Chu Shijin,Peng Rufang
MOFs are confined to solid supports to overcome their inherent disadvantages of lightweight and submicron size, which pose challenges to the adsorption operation. ZIF-8 nanoparticles can be loaded onto bacterial cellulose (BC) in a simple manner, and subsequently carbonized at 700 °C to obtain a larger specific surface area (expressed as BC@ZIF-8 carbon aerogels (BZCA). SEM indicates that ZIF-8 was successfully self-assembled on bacterial cellulose. Various characterization techniques (SEM, TEM, FT-IR, XRD, BET, and XPS) indicated that BZCA had been successfully prepared, with a large specific surface area (220.45 m 2 /g) and sufficient functional groups (-NH-, -OH, Zn–O, N–O, and C = N-). The relationship of the adsorption of BZCA to UO 2 2+ with both contact time and initial concentration was then studied. Results showed that the adsorption of UO 2 2+ followed a pseudo-second-order kinetic model (R 2 = 0.999). After calculation, the maximum adsorption capacity of BZCA was 535 mg/g, which was comparable to or better than that of other adsorbents. The kinetic analysis disclosed that 70 min was enough for BZCA to reach the adsorption equilibrium. The adsorption mechanism of the prepared adsorbent on UO 2 2+ was studied by FTIR and XPS.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 21
·12212-12223
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IF 4.22
Lu Qi-Lin,Wu Jiayin,Li Yonggui,Li Lu,Huang Biao
The use of lignocellulosic materials for extracting functionalized cellulose nanocrystals (FCNs) in a green and sustainable method under mild conditions is limited owing to the strong hydrogen bonding in cellulose. A facile, green, and high-efficient avenue was developed to produce FCNs with high yield through the mechanochemistry synergetic effect of recyclable p-toluenesulfonic acid (PTSA)-catalyzed deep eutectic solvent (PDES) and microwave- solvothermal (MWS). FCNs with a high charge density of 1.59 e nm −2 , a crystallinity of 81%, a better thermostability and dispersibility were obtained at a high yield of 87.6% by the one-step processing. The PDES could be easily recycled, and thus was beneficial to cost reduction and waste liquor treatment. Generated FCNs could be used to develop functional bionanocomposites due to their enhanced effect. When a loading of 1 wt% FCNs was added into gelatin matrix, the tensile strength and Young’s modulus of the bionanocomposites increased 188 and 131%, respectively, suggesting their remarkable stress transfer potential. Thus, the study demonstrates a green and cost-effective approach for the mass production of FCNs, contributing to strong potential in building high-performance bionanocomposites.
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CELLULOSE
·
2021
·Vol. 28
·期 10
·6133-6146
·
IF 5.044
Du Peng,Ding Qijun,Zhao Chuanshan,Jiang Yifei,Han Wenjia,Li Xia
Abstract Nanofibrillated cellulose is obtained from cellulose resources (e.g., Natural cellulose, bacterial cellulose) and is deemed to be environmentally friendly, green, and inexhaustible. Accordingly, we reported an innovative method for fluorine-free water- and oil/grease-repellent surface based on porous cellulose-based materials. In order to improve oil/grease resistance, sulfonated nanofibrillated cellulose (SNFC) was coated on the surface to fill the porous, the obtained paper was soaked in chitosan aqueous solution as the second layer. The-SNFC-chitosan-coated paper was applied with modified polyvinyl alcohol (MPVA) as the third layer to increase water resistance and water vapour transmittance. The experimental results showed 5.2 g/m 2 SNFC, 2.5 g/m 2 chitosan and 7% MPVA demonstrated excellent kit rating value of 12/12 (maximum grease resistance) (oil resistance contact angle is 103.93°), good water resistance (water contact angle is 108.6°) and high water vapour transmission rate (4.8 × 10 –14 g cm/cm 2 s Pa) under the condition of 90% relative humidity. This non-fluorinated and practical method is an excellent alternative to existing fluorinated materials, which will further promote the development of cellulose-based packaging. Graphic abstract
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Tian Tan,Jiali Zhou,Xin Gao,Xiaoning Tang,Heng Zhang
The eco-benign water-absorbent gel was obtained by modification of tartaric acid (TA) onto parenchyma cellulose from corn stalk pith (CSP) in N, N-dimethylacetamide (DMAc)/LiCl system. The water affinity of the gel was aided with TA as both grafting agent and cross-linker via esterification. The degree of swelling was strongly influenced by TA amount, reaction temperature and duration, and the absorbency of TA-esterified product reached up to about 417 g H 2 O/g dry gel. The three-dimensional macro-porous structures of the bio-absorbent led to fast penetration and diffusion of water into gel. Studies of absorption behavior in deionized water showed that the initial water uptake followed the non-Fickian mechanism, the Schott second-order equation governed the swelling kinetics, and the later part of swelling was relaxation of polymer chains. FTIR and X-ray diffraction analyses confirmed successful modification of TA molecules onto cellulose chains through the formation of ester bonds and transition of crystalline forms from cellulose Ⅰ to cellulose Ⅱ. Moreover, thermogravimetric outcomes illustrated the thermal resistance of the TA-esterified gel with a loose structure was lower than SCP cellulose. This work designed a green water-absorbent that could be potentially utilized as favorable water retention material in agriculture and horticulture.
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Microbial Cell Factories
·
2021
·Vol. 20
·期 1
·1-12
·
IF 5.328
Jia Hexue,Sun Wan,Li Xuezhi,Zhao Jian
Background Trichoderma reesei is currently the main strain for the commercial production of cellulase. Cellulose induced protein 1 (Cip1) is one of the most abundant proteins in extracellular proteins of T. reesei. Reported literatures about Cip1 mainly focused on the regulation of Cip1 and its possible enzyme activities, but the effect of Cip1 on the enzymatic hydrolysis of lignocellulose and possible mechanism have not still been reported.Results In this study, Cip1 from T. reesei was cloned, expressed and purified, and its effects on enzymatic hydrolysis of several different pretreated lignocellulose were investigated. It was found that Cip1 could promote the enzymatic hydrolysis of pretreated lignocellulose, and the promoting effect was significantly better than that of bovine serum albumin (BSA). And especially for the lignocellulosic substrate with high lignin content such as liquid hot water pretreated corn stover and corncob residue, the promoting effect of Cip1 was even better than that of the commercial cellulase when adding equal amount protein. It was also showed that the metal ions Zn2+ and Cu2+ influenced the promoting effect on enzymatic hydrolysis. The Cip1 protein had no lyase activity, but it could destroy the crystal structure of cellulose and reduce the non-productive adsorption of cellulase on lignin, which partly interpreted the promoting effect of Cip1 on enzymatic hydrolysis of lignocellulose.Conclusion The Cip1 from T. reesei could significantly promote the enzymatic hydrolysis of pretreated lignocellulose, and the promotion of Cip1 was even higher than that of commercial cellulase in the enzymatic hydrolysis of the substrates with high lignin content. This study will help us to better optimize cellulase to improve its ability to degrade lignocellulose, thereby reducing the cost of enzymes required for enzymatic hydrolysis.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Mingyuan Yan,Yuelei Pan,Xudong Cheng,Zhongxin Zhang,Yurui Deng,Zhiyi Lun,Lunlun Gong,Mengyao Gao,Heping Zhang
Advanced thermal insulation materials with low thermal conductivity and robustness derived from regenerative resources are badly needed for building energy conservation. Among them, nanofibrillated cellulose aerogels have huge application potential in the field of thermal insulation materials, but it is still a challenge to prepare cellulose aerogels of excellent comprehensive properties in a simple way. Herein, we demonstrate a unidirectional freeze-drying strategy to develop a novel “robust–soft” anisotropic nanofibrillated cellulose aerogel (NFC-Si-T) by integrating nanofibrillated cellulose (NFC) and Si–O–Si bonding networks under the catalytic dehydration of p-toluenesulfonic acid (TsOH). The anisotropic structure endows the NFC-Si-T with high flexibility that can be easily bent or even tied with a knot, and in addition, it possesses high Young’s modulus (1–3.66 MPa) that can resist the compression weight of 10,000 times of its own weight without deformation. Furthermore, the NFC-Si-T aerogels exhibit anisotropic thermal insulation performances with a low average thermal conductivity (0.028–0.049 W m–1 K–1). More importantly, the limited oxygen index of the NFC-Si-T reaches up to 42.6–51%, showing excellent flame-retardant performance. Therefore, the “robust–soft” anisotropic NFC-Si-T aerogels can be used as an advanced thermal insulation material for building thermal insulation applications.
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Zhibin Lai,Jun Ye,Jian Xiong
A series of fluorescent nanocomplexes of carboxymethyl cellulose (CMC)/Terbium (Tb)- Europium (Eu) were successfully synthesized without introducing a second ligand. By adjusting the concentration of the coordinated ions, these nanocomplexes exhibit favorably visibly tunable luminescence properties with colors being able to change from green to red. The XPS analysis demonstrates the formation Tb(III)-O 2− and Eu(III)-O 2− between OH and COO − in CMC and Tb 3+ or Eu 3+ ions, which is advantage for light absorption by UV–Vis spectroscopy and fluorescence spectroscopy. The ligand CMC plays a role in coordinating with terbium and europium ions, but also serves as an energy donor to these metal ions by antenna effect. Moreover, the energy transfer also occurred from terbium ions to europium ions in CMC matrix, which is responsible for the tunable luminescence properties of these complexes.
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高影响因子
Carbohydrate Polymer Technologies and Applications
·
2021
·
IF 0
Yulin Wang,Qingli Qu,Jiaxin Cui,Tao Lu,Fanghua Li,Mengjie Zhang,Kunming Liu,Qian Zhang,Shuijian He,Chaobo Huang
Free-standing N-doped carbon nanofiber membranes have been obtained from cellulose acetate (CA) and soy protein isolate (SPI). As an environmental friendliness, inexpensive and abundant polysaccharide in nature, cellulose and its derivatives have shown great potentials in the preparation of energy storage materials. This work successfully fabricated cellulose-based carbon nanofiber membranes through electrospinning, regeneration process and carbonization. Furthermore, this paper has intensively studied the electrospinning parameters of CA (main component) and SPI composite fiber membranes and explored the influence of carbonization temperature on their microstructure and electrochemical properties. The resultant CA-SPI derived carbon nanofiber membranes are applied in supercapacitors (SCs) for the first time, and display good electrochemical performance because of their unique structures and pseudo-capacitance contribution from heteroatoms. The as-received CA-SPI-800 exhibits large specific capacitance of 219.3 F g −1 at 0.2 A g −1 in 6 M KOH. CA-SPI-800 shows high cycling stability with 98.9% capacitance retention after 50,000 cycles at 20 A g −1 . The symmetrical supercapacitor possesses 99% Columbic efficiency and outstanding cycling stability of 94.1% retention after 40,000 charging-discharging processes at 20 A g −1 . It is expected that the design of CA-SPI nanofiber membranes will provide a successful route for the preparation of cellulose derived nanofibers, and broaden their applications in low-consumption and green energy storage devices.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Kunpeng Qian,Qianfan Zhou,Hongmin Wu,Jianhui Fang,Miao Miao,Yuhuan Yang,Shaomei Cao,Liyi Shi,Xin Feng
Well established internal multilayered structures have been demonstrated to contribute greatly towards outstanding shielding effectiveness (SE) in electromagnetic interference (EMI) shielding systems. A specific encapsulation by intercalating carbonized cellulose microspheres into Ti 3 C 2 T x MXene layers (CCM@MXene) is elaborately designed. The CCM@void@MXene composite films with “egg-box” structure are ultimately achieved by annealing treatment with spherical CCM@MXene as “egg” and Ti 3 C 2 T x MXene layers as “box”. The unique structure with interior void space is attributed to internal multiple reflections of incident electromagnetic waves (EMW) and contributes to the enhancement of EMW absorption. Thanks to the electrically conductive network of Ti 3 C 2 T x MXene adhering to cellulose microspheres surface, the egg-box structure composite films exhibit superb electrical conductivity of 1672.0 ± 7.1 S cm −1 and excellent specific EMI shielding efficiency (up to 18637.14 dB cm 2 g −1 ) at an ultrathin thickness (12.1 ± 0.8 μm). This hierarchical porous egg-box structure offers an ideal potential for application in highly efficient EMI shielding systems.
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高影响因子
CARBON
·
2020
·
IF 8.821
Ping Wang,Dongxiao Zheng,Shouxin Liu,Mengkai Luo,Jian Li,Shen Shen,Shujun Li,Liangliang Zhu,Zhijun Chen
Embedding luminogens into a well-selected rigid matrix has been a particularly attractive way of preparing long afterglow materials. On this basis, seeking green, low-cost and sustainable materials or strategies, remains challenging but desirable. Prompted by the generation of wood fluorescence, a general strategy for preparing long afterglow materials successfully developed by embedding biomass-derived carbon dots into cellulose fibrils. Internal hydrogen bonding interactions between cellulose fibrils and carbon dots strongly erected a confinement effect for protecting the triplet exciton from quenching, leading to an increase of phosphorescence lifetime by seven orders of magnitude. These properties, which originated from such a green and convenient approach, were able to match most of reported long afterglow examples. Moreover, thanks to the humidity sensitivity of cellulose, the materials can behave a unique humidity-dependent phosphorescence property, showing superior potential application in advanced anti-counterfeiting and encryption.
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危险品化学品经营许可证（带存储）