CELLULOSE
·
2018
·Vol. 25
·期 7
·4067-4078
·
IF 3.809
Xuan Junji,Tian Jintao
The cellulose colloidal particles with good photochromic and photoluminescent performances had been developed in aqueous solution based on a spiropyran-grafted filter paper cellulose (SP–cellulose) in this study. The insoluble filter paper cellulose dramatically became soluble in ethanol after grafting a spiropyran derivative onto its backbone via esterification. During this process, the optical properties of the spiropyran had been successfully inherited. With the aid of ultraviolet and visible light, the obtained SP–cellulose colloidal particles showed light-induced tunability on both photochromism and photoluminescence, corresponding to the significant change of the spiropyran between weak polar ring-closed spiropyran and strong polar ring-opened zwitterionic merocyanine. Based upon this result, the SP–cellulose colloidal particles were finally obtained in water by follow-up dialysis process. In comparison to the pure spiropyran showing poor optical properties in mixed solvent of ethanol/water, the obtained SP–cellulose colloidal particles in water showed good photochromic and photoluminescent performances as well as fine stability. Considering also the raw material of filter paper being cheap and easy to get as well as the facile preparation process of the functional colloidal particles, our experimental results may bring about more promising applications of spiropyran species and water-insoluble cellulose in aqueous medium.
研究领域:
材料科学
·
化学
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Jian Du,Xiu Zhang,Xuezhi Li,Jian Zhao,Guodong Liu,Baoyu Gao,Yinbo Qu
Commercial cellulase preparations for lignocellulose bioconversion are mainly produced by the fungus Trichoderma reesei . The maximum cellulose conversion of T. reesei cellulase mixture was 15%–20% higher than that of Penicillium oxalicum in the hydrolysis of corncob residue and Avicel. Nevertheless, both preparations hydrolyzed more than 92% of cellulose in NaOH-mercerized Avicel. When added to Avicel hydrolysis residue that was less reactive to P. oxalicum cellulases, cellobiohydrolase I (CBH I) from T. reesei resulted in a higher cellulose conversion than its homologous proteins from P. oxalicum and Aspergillus niger at the same protein loadings. Further domain exchange experiment attributed the high hydrolytic efficiency of T. reesei CBH I to its inter-domain linker and cellulose-binding domain. The results in part explained the superior performance of T. reesei cellulases on the degradation of native crystalline cellulose, and highlighted the important role of cellulose-binding region in determining the degree of hydrolysis by cellulases.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Haiwei Ren,Zhihang Xu,Ming Gao,Xueye Xing,Zhe Ling,Lichao Pan,Yaqin Tian,Yi Zheng,Wenguang Fan,Weixia Yang
Microcrystalline celluloses were isolated from four agricultural residues, including sweet sorghum stalk, Jerusalem artichoke stalk, grains stillage, and Chinese herb residue, and characterized in terms of physicochemical and structural properties. The obtained microcrystalline celluloses were composited with polylactic acid as a packing film for the preservation of Lanzhou lily. All the agricultural residues-derived microcrystalline celluloses were in cellulose I β structure with high purity and good thermal stability . Microcrystalline celluloses from sweet sorghum stalk had a higher degree of polymerization (327) and crystallinity (70.52 %) than others. The preservation effect of lily bulbs packaged by films were significantly improved indicated by the lessened weight loss rate and the meliorative hardness and whiteness, which ascribe to the repressed oxidation reactions . Polylactic acid/microcrystalline cellulose composite films prepared from sweet sorghum straw have been proved the most effective. This work could offer a value-added outlet for agricultural residues to produce microcrystalline celluloses-based biocompatible films for preservation of Lanzhou lily.
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DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 17
·3449
·
IF 4.967
Fei Liu,Shan Lu,Weihong Cao,Juncheng Huang,Yi Sun,Yiting Xu,Meiling Chen,Haining Na,Jin Zhu
Cellulose-grafte-poly(L-lactide) (C-g-PLLA) copolymers synthesized in a CO2-switchable solvent are proposed for use as effective compatibilizers for the preparation of cellulose–PLLA composites with enhanced interfacial compatibility. The effect of the molar substitution (MSPLLA) of the grafted PLLA side chain in the C-g-PLLA copolymer and the feeding amount of this copolymer on the mechanical and thermal properties and hydrophilicity of the composites was investigated. The composites had a largely increased impact strength with the incorporation of the compatibilizer. With the increasing ofMSPLLAand the feeding amount of the copolymer, the resulting composites had an increased impact strength. When 5 wt% C-g-PLLA withMSPLLAof 4.46 was used as a compatibilizer, the obtained composite containing 20 wt% cellulose presented an impact strength equal to that obtained for the neat PLLA. The composites had a slightly decreased melting temperature and thermal decomposition temperature, but increased hydrophilicity due to the incorporation of the compatibilizer. This work suggests an effective method to improve the interfacial compatibility between cellulose and PLLA for the fabrication of fully bio-based composites with high performance.Keywords:cellulose;poly(L-lactide);composite;compatibilizer;CO2-switchable solvent
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PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Yunqing He,Hui Li,Xiang Fei,Lincai Peng
A new natural formulation composed of CMC and various contents of CNC immobilized AgNPs (CNC@AgNPs) was developed for paper coating. The mechanical strength, water vapor and air barrier properties, and antibacterial activities of CMC/CNC@AgNPs coated paper improved with the increasing content of CNC@AgNPs. CMC/CNC@AgNPs7 % coated paper exhibited 1.26 times increase in tensile strength, 45.4 % decrease in WVP, 93.3 % reduction in air permeability as well as the best antibacterial activities against E.coli and S.aureus compared with uncoated paper. Moreover, the cumulative release rate of AgNPs from coated paper significantly reduced due to the immobilization effect of CNC on AgNPs. Furthermore, CMC/CNC@AgNPs coated paper was used to package strawberries under ambient conditions. The results showed that coated paper could maintain better strawberries quality compared with unpackaged strawberries and extend the shelf-life of strawberries to 7 days. Therefore, the prepared CMC/CNC@AgNPs coated paper will have a great application prospect in the food packaging.
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PubMed
高影响因子
CELLULOSE
·
2025
·
IF 4.8
Xuan Xiang-Tao,Zhang Hui,Yao Jia-Le,Miao Ya-Ping,Fan Wei,Dong Xiang-Zhi,Dai Chen-Min,Miao Jiao-Jiao
Photoreforming cellulose to simultaneously produce 5-hydroxymethylfurfural (5-HMF) and hydrogen represents a promising strategy for harnessing solar energy. However, the development of highly efficient photocatalysts for this reaction remains a challenge, and the influence of cellulose’s crystalline structure on conversion efficiency is not well understood. In this study, a Pt-modified g-C 3 N 4 –Bi 3 TiNbO 9 heterojunction photocatalyst was synthesized to explore the photocatalytic reforming of four crystalline forms of cellulose. The results demonstrate that the crystalline structure of cellulose significantly affects hydrogen and 5-HMF production, with the order of activity being cellulose III > IV > II > I. Among the cellulose types tested, cellulose III exhibited the highest performance, achieving 51.8 μmol g⁻ 1 h⁻ 1 of hydrogen and 113.4 μmol g⁻ 1 h⁻ 1 of 5-HMF, surpassing the yields from cellulose I, II, and IV when using the Pt 1.0 –g-C 3 N 4 –Bi 3 TiNbO 9 (2:1) heterojunction. Additionally, a lower degree of polymerization of cellulose was found to favor the coproduction of hydrogen and 5-HMF, as it enhances the breakdown of cellulose via reactive species. Factors such as cellulose powder size, solution pH, and catalyst-cellulose interactions were also shown to influence the yields. Density functional theory (DFT) calculations revealed an electron migration of 0.019684e between the O 2 p and Bi 6 p orbitals of Bi 3 TiNbO 9 (220) and the C 2 p and N 2 p orbitals of g-C 3 N 4 , confirming interfacial electron transfer. The calculated adsorption energies followed the trend: cellulose IV (− 1.72 eV) > I (− 1.73 eV) > II (− 1.94 eV) > III (− 2.07 eV), consistent with experimental results, except for cellulose IV. Graphical abstract
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yena Liu,Shaomin Kang,Rani Bushra,Jiaqi Guo,Wenyuan Zhu,Xingxiang Ji,Xuguo Duan,Yang Huang,Chaofeng Zhang,Mohammad Rizwan Khan,Huining Xiao,Junlong Song
Bacterial cellulose (BC) has been extensively applied to fabricate advanced biomaterials, although it remains challenging due to its poor toughness and water stability. Herein a genetically engineered protein-conjugated synthetic polymer is designed to improve BC film's strength and flexibility. Initially, the hybrid polymer is constructed by grafting Family 3 carbohydrate-binding modules (CBM3) to amphoteric polyacrylamide polymer (AmPAM), one of the paper industry's most widely used dry-strength agents. Then, the conjugated polymer is added to the culture medium of BC growth, enabling it to incorporate into the matrix of cellulose chains. The results show that the BC film modified by CBM3-AmPAM exhibits superior mechanical properties, registering 9.94 % in strain and 13.8 MJ/m 3 in toughness, 12.1 and 8.0 folds over the sample with AmPAM addition only. Additionally, the BC film improved by CBM3-AmPAM has excellent gas resistance, thermal stability, and environmental endurance. The adsorption of CBM3-AmPAM on BC film revealed by quartz crystal microbalance with dissipation monitoring indicates that the adsorbed layer is thin and rigid, suggesting the strong interaction between the conjugated polymer and BC substrate. As a result of this reinforcing strategy, BC composites can be used in a wider range of applications.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yonggang Du,Weiqiang Xu,Yulei Jia,Yahui Cui,Yuyan Bi,Yudou Wang,Diansheng Wang
To overcome the suboptimal performance of paper–based humidity sensors, sensing composite materials were developed through the aqueous–mechanical defibration of everyday office paper into paper–derived cellulose fibers (PDCFs), followed by integration with molybdenum disulfide (MoS₂) microspheres. This straightforward yet effective strategy affords significant advantages for enhancing sensing capabilities. Specifically, the defibration process increases available adsorption sites by exposing hydrophilic groups while simultaneously generating more porosity for accelerated water vapor diffusion. Furthermore, utilization of the PDCFs suspension facilitates uniform dispersion of MoS₂ microspheres throughout the cellulose matrix, thereby harnessing synergistic effects from both components to improve sensing performance. Additionally, the aqueous composite's drop–casting compatibility enables utilization of microscale interdigitated electrodes (IDEs) spacing to enhance sensitivity. The resulting PDCFs–MoS₂ film sensor demonstrates exceptional characteristics, including a high response value (4167.8), a broad detection range (0–97 % RH), rapid response and recovery time (1.0 and 22.6 s, respectively), low hysteresis (3.8 %), good repeatability, and long–term stability. The sensor's practical utility was validated via human respiration monitoring and non–contact switching. This work establishes a viable pathway for transforming office paper into high–performance humidity–sensing materials.
研究领域:
材料科学
·
传感器与传感技术
·
纳米复合材料
·
环境监测
·
柔性电子学
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 98
·95656-95662
·
IF 3.289
Peipei Sun,Kaitao Zhang,Shibin Shang,Jie Song,Dan Wang
Hydrothermal carbonization (HTC) is an effective and sustainable way to covert biomass into functional carbonaceous materials. Effects of condition parameters on the morphology and particle size distributions were evaluated. However, the absence of porosity of HTC materials limits their wide applications. Activation of HTC materials could solve this problem. Traditional activation methods, which use strong base or acid as activating agent, could lead to pollutions. Here, we prepared microporous activated carbon spheres from ethyl cellulose under static air atmosphere. The resultant activated carbon spheres were characterized by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), FT-IR spectrometer, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption. Results reveal that the obtained carbon spheres show smooth surface, good dispersion and abundant surface functional groups. In addition, the spherical carbon exhibits high adsorption abilities for different kinds of dyes, which is important for environment protection.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zifan Song,Ran Chen,Shan Luo,Wangyang Yu,Jinqiu Yuan,Fengcai Lin,Meijie Wang,Xingzhong Cao,Yiqiang Liao,Biao Huang,Xinda You
Organic solvent nanofiltration (OSN) is a low-carbon technology for organic mixture separation that usually relies on non-renewable fossil-derived membranes. Cellulose, a biomass material with extensive sources and superior resistance to organic solvents, holds great promise in engineering OSN membranes. Here we studied the mass transport and separation properties of regenerated cellulose membranes (RCMs), which were made from wood pulp using ionic liquid as solvent by phase inversion method. By regulating membrane thickness from 150 μm to 350 μm, the solvent permeance and solute rejection can be finely tuned. The 350-μm-thick RCM membrane (RCM-350) displays better compaction resistance than the thinner ones and harvests high solute rejection with ethanol permeance reaching ∼ 30 L m −2 h −1 bar −1 , outperforming the state-of-the-art polymeric membranes and showing long-term stability during cross-flow OSN. When used for solute separation, the RCM-350 membrane provides molecular selectivity of up to 294 and 68 for Alcian blue/Rifampicin and Alcian blue/Tetracycline mixtures, respectively, which depends on the mixture composition. Our findings reveal the potential of regenerated natural cellulose as a high-performance and sustainable alternative membrane material for separating organic mixtures.
研究领域:
材料科学
·
环境工程
·
化学工程
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 4
·2229-2240
·
IF 5.044
Shao Yatao,Fan Zhihong,Zhong Mingfeng,Xu Wei,He Chang,Zhang Zhijie
Polypyrrole/bacterial cellulose (PPy/BC) composites with nanofiber structure were prepared by a facile in situ oxidative polymerization for the efficient removal of hexavalent chromium (Cr(VI)) from aqueous solution. The characteristics of the adsorbent were analysed by SEM, TEM, BET, EDX, FT-IR, and XPS and PPy found to be evenly wrapped on cellulose surfaces to form a core–shell structure and the specific surface area calculated at 95.9 m 2 g −1 . Benefiting from high surface area, PPy/BC efficiently removed Cr(VI) and possessed a maximum adsorption capacity of 555.6 mg g −1 at 298 K and pH 2. Adsorption data was determined to conform to the Langmuir isotherm model and pseudo-second-order model. Cr(VI) adsorption on PPy/BC was involved in ion exchange and electrostatic attractions. Meanwhile, a portion of Cr(VI) was reduced to trivalent chromium (Cr(III)) by pyrrolic nitrogen and then retained on PPy/BC surfaces by chelation. In addition, PPy/BC maintained 70.5% of its initial adsorption capacity after five adsorption and desorption cycles. This study demonstrated that PPy/BC can be a cost-effective, reusable, and highly efficient adsorbent for Cr(VI) removal.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Yujie Ji,Qi Xia,Juqing Cui,Minghao Zhu,Yufeng Ma,Yutong Wang,Lu Gan,Shuguang Han
In the work, the non-woven cellulose acetate (CA) nanofiber mats were prepared via electrospinning, and CA nanofiber were incorporated into the core layer of the high-pressure laminates (HPLs). When the concentration of CA was 16 wt%, SEM images demonstrated that the morphology of the CA nanofiber mat was the best, with an average diameter of 654±246 nm. When CA nanofiber mats were incorporated into the core layer of HPLs, the mechanical properties of the resulted HPLs composites were significantly improved. Specifically, the tensile strength and elongation at break of the nanofiber mats reinforced HPLs composites increased remarkably to 40.8 ±1.1 MPa and 27.9 ± 0.9 %, respectively, which were nearly 6 times and 4.4 times higher than those of the pure HPLs. Furthermore, the incorporation of the CA nanofiber mats also significantly improved the flame retardancy of the HPLs, which was revealed from the thermogravimetric analysis (TGA) results.
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