FUEL
·
2022
·
IF 8.035
Yishuang Wang,Jingjing Shi,Xiangsong Chen,Mingqiang Chen,Jun Wang,Jianming Yao
Cellulose conversion for ethyl levulinate (CCEL) production is a potential technology for obtaining liquid fuels. Combined the inherent characteristics of cellulose with “homogeneous reaction-heterogeneous separation” feature of heteropoly acids (HPAs), HPAs catalyzed CCEL under ethanol medium were investigated. Various characterizations confirmed HSiW had appropriate Brønsted and Lewis acid sites. Therefore, HSiW achieved the highest cellulose conversion (95.25 %) and ethyl levulinate (EL) yield (77.05 %), and EL selectivity reached to 75.15 % under optimized reaction conditions. Additionally, the reaction pathways of CCEL were proposed and the reactions of fructose dehydrated into hydroxymethylfurfural (HMF) and further alcoholysis into EL were improved by HPAs. The successfully established kinetic model of CCEL indicated the activation energies of cellulose conversion into HMF (26.90 kJ·mol −1 ) and HMF alcoholysis for EL (24.22 kJ·mol −1 ) were significantly lower than those of them transformed to humins (99.19 and 53.68 kJ·mol −1 ), suggesting HPAs catalysis could effectively inhibit humus generation.
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Jiang Deng,Tianyi Xiong,Haiyan Wang,Anmin Zheng,Yong Wang
Porous carbon materials stemming from biomass have drawn increasing interest because of their sustainable properties. Cellulose, hemicellulose, and lignin are the three basic components of crude biomass, and were investigated to reveal their influence on the derived carbonaceous materials. Huge amounts of oxygen-containing functional groups in cellulose and hemicellulose tend to be eliminated as H2O, CO2, and CO and give micropores during pyrolysis, whereas lignin contains plentiful aromatic units which are chemically inert, and thus produce nonporous carbon materials. When the KHCO3 was introduced during the pyrolysis process, the plentiful hydroxyl in cellulose and hemicellulose underwent dehydration condensation among different parent polymers, which are responsible for the formation of macroporous structure. By contrast, The β-O-4 bands in lignin experience homolysis and give rise to benzene-containing units, which finally result in carbon nanosheets. Furthermore, we demonstrated the mixture of cellulose, hemicellulose, and lignin can display a three-dimensional porous structure (containing macropores, mesopores, and micropores) when less than 50% of lignin is contained.
✓ 已验证
DOI
高影响因子
Gels
·
2021
·Vol. 8
·期 1
·17
·
IF 4.702
Qiqi Song,Changqing Miao,Huazheng Sai,Jie Gu,Meijuan Wang,Pengjie Jiang,Yutong Wang,Rui Fu,Yaxiong Wang
Forming fibers for fabric insulation is difficult using aerogels, which have excellent thermal insulation performance but poor mechanical properties. A previous study proposed a novel method that could effectively improve the mechanical properties of aerogels and make them into fibers for use in fabric insulation. In this study, composite aerogel fibers (CAFs) with excellent mechanical properties and thermal insulation performance were prepared using a streamlined method. The wet bacterial cellulose (BC) matrix without freeze-drying directly was immersed in an inorganic precursor (silicate) solution, followed by initiating in situ sol-gel reaction under the action of acidic catalyst after secondary shaping. Finally, after surface modification and ambient drying of the wet composite gel, CAFs were obtained. The CAFs prepared by the simplified method still had favorable mechanical properties (tensile strength of 4.5 MPa) and excellent thermal insulation properties under extreme conditions (220 °C and −60 °C). In particular, compared with previous work, the presented CAFs preparation process is simpler and more environmentally friendly. In addition, the experimental costs were reduced. Furthermore, the obtained CAFs had high specific surface area (671.3 m²/g), excellent hydrophobicity, and low density (≤0.154 g/cm3). This streamlined method was proposed to prepare aerogel fibers with excellent performance to meet the requirements of wearable applications.
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 10
·2053
·
IF 4.967
Jijuan Zhang,Hongfei Huo,Lei Zhang,Yang Yang,Hongchen Li,Yi Ren,Zhongfeng Zhang
Cellulose has attracted considerable attention as the most promising potential candidate raw material for the production of bio-based polymeric materials. In the last decade, significant progress has been made in the production of biopolymers based on different cellulose forms. In this study, cellulose was obtained in an innovative and environmentally friendly way, using boxwood powder. Crude cellulose was obtained by treatingBuxuspowder with an ethanol–acetic acid–water mixture. Refined cellulose was then obtained by treatment with an acidic sodium hypochlorite solution and alkaline hydrogen peroxide solution. The novel chemistry of cellulose prepared by this method promises to be not only green, but also highly desirable, because of its lower emissions and low cost. It is crucial for the future of the global polymer industry. The refined cellulose was subjected to a high-temperature hydrothermal treatment under two temperatures and time conditions, with temperature gradients of 120, 140, and 160 °C, and time gradients of 1, 2, and 3 h. The samples were subjected to infrared and thermogravimetric analyses. The cellulose undergoes dehydration and thermal degradation reactions during the heat treatment process, and the thermal stability of the residual is enhanced, compared with that of virgin cellulose. Between 120 and 140 °C, the hydroxyl and hypomethyl groups on the surface of cellulose are shed. Groups in the amorphous region of the polymer are the first to be shed. The dehydration reaction reduces the number of free hydroxyl groups on the surface of the cellulose molecules. The dehydration reaction was accelerated by an increase in temperature. Between 140 and 160 °C, the β-(1,4)-glycosidic bond begins to slowly break and some furans are generated. The structure of cellulose undergoes reorganization during thermal treatment. The thermal stability of the modified material is greater than that of untreated cellulose.
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Denan Kong,Qunchao Zhang,Jun You,Yuanyuan Cheng,Cheng Hong,Zihe Chen,Tao Jiang,Tonghui Hao
Adhesion loss of hydrocolloid wound dressings is ubiquitous clinical problem, which seriously reduces the therapeutic efficiency and patient experience. In order to address this problem, the clarification on adhesion loss mechanism and the development of effective alternatives of commercial hydrocolloid dressings are urgent and inevitable. Herein, adhesion loss mechanism of hydrocolloid dressings was investigated using sodium carboxymethyl cellulose (CMC)-filled hydrocolloid dressings exposing to physiological environment as model. The adhesion mechanism and contact angle tests were combined to obtain surface energy of dressings. The results indicated that the dissolution, swelling and exudation of CMC occurred successively (concentration reached 1.607 g/L after 10 h). The effused CMC led to the dramatic increase in surface energy (from 14.5–80.7 mN/m) and adhesion loss appeared. This work explored the origin of adhesion loss of hydrocolloid wound dressings and might promote the designing of hydrocolloid dressings with both excellent humidity control and sustained self-adhesiveness.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kefan Zhou,Min Zhang,Xiangni Zhang,Tianyu Wang,Helin Wang,Zhiqiao Wang,Xiaoyu Tang,Miao Bai,Shaowen Li,Zhaohui Wang,Yue Ma
The lightweight solid electrolyte design in replacement of the flammable liquid electrolyte and polyolefin separator is the key of the energy-dense all-solid-state batteries (ASSBs) construction. However, the technological barriers of scalable manufacturing, retarded ionic conductivity at room temperature as well as the mechanical fragility upon the high-temperature operation restrict the ASSB deployment of practical relevance. In this study, an ultra-lightweight (1.67 mg cm −2 ), thin (25 μm), high strength and thermally robust (stability up to 180 °C) composite solid electrolyte (CSE) has been designed to address the dilemma by the rational integration of polyethylene glycol monomethyl ethers coated Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 nanofillers (MPEG@LLZTO) with lightweight nanocellulose scaffold. The MPEG coating layer enhances the interfacial compatibility and homogeneous dispersibility of LLZTO nanofiller within the poly (ethylene oxide) (PEO) matrix, while the mechanically flexible and thermally stable nanocellulose scaffold guarantees the formation of the high-temperature endurance and structural robustness for the as-formed CSE layer. Upon the solvent-free, layer stacked-up assembly of the PEO/MPEG@LLZTO-Nanocellulose (PLCN) CSE film with the high-mass-loading LiFePO 4 cathode and thin-layer lithium anode, the ASSB prototype could simultaneously realize the high gravimetric energy density (323 Wh kg −1 ), cycling stability as well as operation reliability within a wider temperature range (25 °C ∼ 130 °C).
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Xinyi Zhu,Liping Bao,Yong Wei,Jiangquan Ma,Yong Kong
Sodium carboxymethyl cellulose (NaCMC) and chitosan (CS) are successfully combined via amidation, and the obtained product, CMC-CS-A, is used for the adsorption of toxic indigo blue (IB) for the first time. The results of control experiments indicate that the adsorption performance of CMC-CS-A is superior to that of NaCMC, CS, and the composites of NaCMC and CS integrated via electrostatic attractions (CMC-CS-E), which can be attributed to the unique interconnected porous network structure of the as-prepared CMC-CS-A. The mass fraction of CS in the CMC-CS-A is also investigated to achieve the best adsorption of IB, and it reveals that satisfactory removal of IB can be achieved at the CMC-CS-A (50 wt%). Important parameters such as contact time, temperature and initial concentration are discussed in detail in this work. Finally, adsorption isotherms and adsorption kinetics are investigated and compared by using classic models, and the results indicate that the adsorption fits well with the Langmuir isotherm model and the pseudo-second-order kinetic model. It opens a new avenue for the effective and convenient treatment of textile wastewater with integrated natural biopolymers.
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Ting Chen,Danlu Zhang,Xiuzhi Tian,Sheng Qiang,Ce Sun,Lei Dai,Meiyun Zhang,Yonghao Ni,Xue Jiang
Moisture-trigged electricity generator (MEG) that can convert ubiquitous moisture into electricity are highly desirable for developing renewable energy supply and ameliorating the crisis in energy. Constructing an asymmetric ordered, namely gradient ordered porous membrane has great potential in MEG. Herein, a series of cellulose acetate (CA)-based membranes with ordered asymmetric honeycomb membranes were fabricated by Breath Figure method , along with silver nanowires (AgNWs) coating. The asymmetric gradient honeycomb pores were achieved by graft modification of lauroyl chloride and adjustment of relative humidity , which not only endowed the MEG with sensitive sensing signals transport under tension and humidity fluctuations but also enhanced voltages generation speed under flowing moisture. The current study provides a facile and scalable strategy for constructing asymmetric gradient ordered porous materials and creates more possibilities for MEG self-powered flexible wearable electronic devices.
✓ 已验证
DOI
高影响因子
MATERIALS TECHNOLOGY
·
2017
·
IF 1.155
Mouping Fan,Haiying Yu,Yu Chen
CuO nanosheets prepared by a hydrothermal treatment were tested as anode material for sodium-ion batteries (SIBs) with aid of different binders, namely carboxymethyl cellulose (CMC) and poly (vinylidene) fluoride (PVDF). Compared with electrode containing PVDF, CuO nanosheets electrode with CMC binder showed significantly more satisfactory electrochemical performance. Specifically, CuO nanosheets electrodes with CMC binder delivered a high reversible capacity of 627.2 mAh g−1 at 50 mA g−1, and 73.4% of initial capacity value at a high current density of 2000 mA g−1 after 100 cycles. According to the morphological characterisation after cycling, compared with PVDF, CMC binder better preserved the structural integrity of the anode and accommodated the volume variation of CuO nanosheets during charge/discharge cycling, thus leading to a more satisfactory electrochemical performance. Furthermore, to explore the practical application of CuO nanosheets anode, a SIB full cell consisting of CuO nanosheets anode and Na3V2(PO4)3 cathode was assembled and tested.
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 42
·45387
·
IF 1.86
Xiaofei Dang,Xinyu Cao,Linnan Ke,Yongmei Ma,Jingjing An,Fosong Wang
In this study, nanofiber cellulose (NFC) based on a 2,2,6,6-tetramethylpiperidine-1-oxyl radical oxidization method was successfully combined with chain-end-functionalized polyethylene containing alkoxysilane via silanization. Fourier transform infrared spectroscopy, transmission electron microscopy, contact angle measurements, Molau tests, and X-ray photoelectron spectroscopy analyses provided further evidence for the effectiveness of the surface modifications. The hydrophilic surface characteristics of NFC were changed to apparently hydrophobic for the modified nanofiber cellulose (M-NFC). Then, the linear low-density polyethylene (LLDPE)/M-NFC nanocomposite was prepared, and the mechanical properties, thermal properties, and crystallization properties of the LLDPE–M-NFC were investigated by tensile testing, thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis. The results show that after modification, the thermal stability of NFC was enhanced. The interface between M-NFC and the matrix was good. The tensile strength and Young's modulus values of the nanocomposites were enhanced compared with those of LLDPE; in particular, the tensile strength and Young's modulus of the blend with 5 wt % M-NFC increased by 56 and 106%, respectively. The storage modulus of the nanocomposites was enhanced obviously over a wide temperature range. The addition of a small amount of M-NFC had slight effects on the crystallinity and melting temperature of LLDPE. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45387.
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Pingping Li,Hongliang Kang,Chao Zhang,Weiwei Li,Yong Huang,Ruigang Liu
Novel ferrocene functionalized hydroxypropyl cellulose (HPC-Fc) were prepared by azide-alkyne cycloaddition and characterized. HPC-Fc exhibits an excellent reversible redox activity and could establish amazing electron transfer ability between enzyme and electrode. HPC-Fc and horseradish peroxidase (HRP) were coated on a platinized carbon electrode to prepare an amperometric biosensor for hydrogen peroxide (H 2 O 2 ) detection. The amperometric response was measured as a function of H 2 O 2 concentration at a fixed potential of 0.35 V in 100 mM phosphate buffer solution (pH 7.0). The novel biosensor exhibits a fast linear response toward H 2 O 2 in the range of 0.1–8 μM with sensitivity of 4.21 nA/μM. Moreover, the enzyme assays measured by the spectrophotometer method confirm that abundant hydroxyl groups of HPC backbones are conductive for HRP to maintaining or even enhancing their activity. The redox active HPC - Fc with the unique properties of both ferrocene and cellulose is a good candidate for biosensor applications.
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 41
·415401
·
IF 3.953
Boheng Yuan,Zhi Cong,Zhi Cheng,Lei Li,Linan Xia,Jieda Yan,Fei Shen,Bin Zhao,Xiaogang Han
Composite polymer electrolyte (CPE) films with high room temperature ionic conductivity are urgently needed for the practical application of high-safety solid-state batteries (SSBs). Here, a flexible polymer-polymer CPE thin film reinforced by a three-dimensional (3D) bacterial cellulose (BC) framework derived from natural BC hydrogel was prepared via the in situ photo-polymerization method. The BC film was utilized as the supporting matrix to ensure high flexibility and mechanical strength. The BC–CPE attained a high room temperature ionic conductivity of 1.3 × 10−4 S cm−1. The Li∣BC–CPE∣Li symmetric cell manifested stable cycles of more than 1200 h. The LCO∣BC–CPE∣Li full cell attained an initial discharge specific capacity of 128.7 mAh g−1 with 82.6% discharge capacity retention after 150 cycles at 0.2 C under room temperature. The proposed polymer-polymer CPE configuration represents a promising route for manufacturing environmental SSBs, especially since cellulose biomaterials are abundant in nature.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）