Journal of Cleaner Production
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2024
·
IF 9.7
Yuqian Zhou,Yuwei Hu,Zhongxin Tan,Tuo Zhou
A green process was devised to effectively extract cellulose from recycled rice straw waste, subsequently ethylating and modifying it into ethyl cellulose (EC), and ultimately blending the EC with ethanol to obtain biodegradable films. The optimal process conditions at each stage were investigated. An assessment was conducted on the crystallinity and thermal stability of rice straw cellulose (RSC), the degree of substitution of EC, and the biodegradability and mechanical properties of EC-ethanol films. The results demonstrated the following: The optimal process conditions resulted in a 95.73 % yield of extracted RSC, a type I crystalline structure, a 31.20 % increase in relative crystallinity , and thermal stability with a main weight loss peak at 340 °C. Under ideal ethylation conditions, the EC production reached 79.60 %, while the degree of substitution ranged from 2.0 to 2.5. After being landfilled in soil for 100 days, the EC-ethanol films degraded at rates of 6.77 %, 4.78 %, and 3.13 % (film concentrations were 0.02, 0.04, and 0.06 g/mL (w/v, EC/ethanol), respectively). Based on the analysis of the films' FT-IR and SEM images, it was concluded that the EC-ethanol films exhibit favorable biodegradability. Moreover, the tensile strength of 0.04 g/mL film reaches up to 44.60 MPa. Hence, the EC-ethanol films in this research could be an environmentally friendly and sustainable alternative to plastic films .
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 4
·2289-2304
·
IF 6.123
Shi Chun,Zhang Lili,Shi Zhengjun,Zai Zhenqiang,Ma Jinxia,Wang Zhiguo
Ag–ZnO/cellulose nanocomposites with an all-weather photocatalytic performance that responds to all light conditions (including ultraviolet light, visible light, and even darkness) were fabricated by adjusting the surface groups and aspect ratios of the cellulose nanofiber substrate. The cellulose nanofibers improved the dispersibility and photostability of the Ag–ZnO nanoparticles (NPs), thereby enhancing the photocatalytic activity. The morphologies and sizes of the ZnO and Ag NPs within the Ag–ZnO/cellulose nanocomposites were controlled by using cellulose nanofibers with different surface groups and aspect ratios. ZnO NPs with average diameters of 250, 500, and 100 nm were synthesized in situ using cellulose nanocrystals (CNCs), cellulose nanofibrils (CNFs), and TEMPO-mediated oxidized cellulose nanofibrils (TOCNFs), respectively. The Ag–ZnO/TOCNF nanocomposites exhibited excellent all-weather photocatalytic performance, high loading amounts, and large effective contact area with pollutants. Free radical trapping experiments demonstrated that ·OH had the most significant effect on the photocatalytic activity. The photocatalytic activity of the Ag–ZnO/TOCNF nanocomposites was improved by preventing the recombination of electrons and holes and increasing the contact area with pollutants and light. The photogenerated electrons stored on the surface of the ZnO NPs and Ag NPs were further used for reducing H 2 O 2 to generate ·OH free radicals in the dark, which continued to catalyze the degradation of pollutants without light irradiation. Moreover, the photocatalytic degradation of methyl orange to CO 2 and H 2 O was confirmed via a catalytic mechanism and liquid chromatography–mass spectrometry.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
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IF 8.742
Anrong Yao,Yongqi Yan,Lin Tan,Yidong Shi,Mi Zhou,Yong Zhang,Puxin Zhu,Shijun Huang
A thin layer of polydopamine (PDA) was coated on the surface of cellulose nanocrystals (CNCs) by the self-polymerization of dopamine (DA) in water to improve the hydrophilicity and lipophilicity of CNCs. Then, the CNCs coated with PDA (PDA@CNCs) were blended with pore forming agent and cellulose acetate (CA), and the CA composite membrane reinforced by PDA@CNCs (PDA@CNCs/CA) was prepared by solution phase transformation method. The effects of PDA@CNCs content on the filtration performance, antifouling ability and mechanical properties of the composite membrane were studied. The results show that adding a small amount of PDA@CNCs can significantly improve the filtration capacity, antifouling performance and tensile strength of CA membrane. When the content of PDA@CNCs was 4 wt%, the hydraulic permeability , flux recovery ratio and tensile strength of PDA@CNCs/CA composite membrane increased by 33%, 15% and 76%, respectively. Simple DA modification improves the lipophilicity and dispersion of CNCs, enhances the binding force between CNCs filler and CA matrix, and improves the performance of CA composite membrane, thus widen the industrial application of CA materials, and shows a broad application prospect in the field of biological separation membrane and water treatment membrane.
研究领域:
材料科学
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环境工程
·
生物分离技术
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 27
·期 2
·955-967
·
IF 3.917
Jiang Lang,Li Ke,Yang Huiyu,Liu Xin,Li Wei,Xu Weilin,Deng Bo
Good mechanical properties of electrospun nanofiber membranes are essential for their successful application for commercial applications by providing sufficient mechanical strength to withstand severe operational conditions and guarantee structural integrity. Cellulose acetate nanofiber membranes modified with both polyvinylpyrrolidone (PVP) coated cellulose nanocrystals (CNC@PVP) and pristine CNCs were prepared using the reinforcement concentration varying from 0 to 0.135 wt%. The stability of dispersed CNCs and CNC@PVP in dimethylacetamide (DMAc) were compared visually. The apparent viscosity as a function of shear rate was compared for both CNCs and CNC@PVP in electrospun solution. Internal structure of obtained nanofiber membranes were compared using scanning electron microscopy to reveal the nanofibers diameter and its distribution. FTIR was used to disclose the different chemical structure of the two groups of membranes. Mechanical properties of nanofiber membranes were also compared. Finally, the thermogravimetric analysis was utilized to compare the thermal stability of different nanofiber membranes.
研究领域:
材料科学
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纳米技术
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化学工程
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高分子科学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Chengling Huang,Youjie Gao,Yi Chen,Yunfei Shen,Hou-Yong Yu
Earth has become depleted of oil and has suffered from the misuse of non-biodegradable plastics. Significant efforts have been dedicated to addressing the application flaws of cellulose as a substitute for plastics derived from petroleum. One of key defects was non-hydrophobic nature which highly influenced the mechanical properties of cellulose material during practical uses. Here, an innovative method was proposed to achieve hydrophobic modification of cellulose films through the molecular dissociation of dodecyltrimethoxysilane (DTMS) without the use of any toxic agents during the cellulose regeneration process. The hydrophobic (water contact angle of 118°), transparent (transmittance of 85%), and high-strength (70 MPa) DC films (cellulose films modified by DTMS) were successfully fabricated via cellulose regeneration process tailored by DTMS after molecular dissociation. The DC films stood out in both hydrophobicity and strength compared with several commercial plastics and the possible hydrophobic mechanism was proposed. Furthermore, the obsession with smart sensing abilities in DC films has made it a potential tool for monitoring baby diapers. Therefore, unlike conventional concepts, the methodology we adopted is simple and efficient, and it also eliminates the need for cellulose and replaces it with plastics.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Yumei Chen,Chunhui Xie,Yang You,Tonghui Xu,Yunqi Li,Jili Yuan,Haibo Xie,Yuanlong Guo
The demand for the recovery of precious metals has become increasingly prominent due to their scarcity and wide application, while the facile preparation of sustainable absorption and separation materials via molecular engineering still face great challenge by using renewable polymer resources. Herein, a water-soluble cellulose levulinate ester (CLE) with ketocarbonyl groups was utilized as 3D network scaffold to fabricate a cellulose-based aerogel adsorbent (CLE@PEI) by introducing polyethyleneimine (PEI) with multiple amine groups. The abundant functional groups and porous architecture allowed CLE@PEI to efficiently capture Au(III), Pt(IV) and Pd(II). The maximum adsorption capacity of CLE@50PEI reached a staggering 1752.0 mg/g for Au(III) at 298 K which was superior than that of Pt(IV) (1420.5 mg/g) and Pd(II) (495.1 mg/g). The adsorption process followed pseudo-second-order kinetic model and Langmuir isotherm behavior, respectively. Additionally, the positively charged CLE@50PEI exhibited excellent selectivity for precious metals in multi-metal mixtures. The outstanding adsorption performance of the CLE@50PEI may be due to the new “adsorption-in situ reduction” mechanism, in which the process primarily involved the ion exchange coupled with electrostatic interaction and complexation, and the in situ reduction of absorbed Au(III) to single crystalline flakes. Moreover, quantitative desorption of the CLE@50PEI-loaded metals was achieved in acidic thiourea solution.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Guozhi Fan,Min Wang,Chongjing Liao,Tao Fang,Jianfen Li,Ronghui Zhou
Cellulose was isolated from rice straw by pretreatment with dilute alkaline and acid solutions successively, and it was further transferred into cellulose acetate in the presence of acetic anhydride and phosphotungstic acid (H 3 PW 12 O 40 ·6H 2 O). The removal of hemicellulose and lignin was affected by the concentration of KOH and the immersion time in acetic acid solution, and 83 wt.% content of cellulose in the treated rice straw was obtained after pretreatment with 4% KOH and immersion in acetic acid for 5 h. Phosphotungstic acid was found to be an effective catalyst for the acetylation of the cellulose derived from rice straw. The degree of substitution (DS) values revealed a significant effect for the solubility of cellulose acetate, and the acetone-soluble cellulose acetate with DS values around 2.2 can be obtained by changing the amount of phosphotungstic acid and the time of acetylation. Both the structure of cellulose separated from rice straw and cellulose acetate were confirmed by FTIR and XRD.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2026
·
IF 9.8
Zikang Hou,Yalan Yu,Wenhao Wu,Yufei Qin,Wen Zhang,Zhiqiang Shi
The performance of sodium-ion batteries (SIBs) is often impeded by the commercial cellulose separators because of their large pore structure and low mechanical strength. Herein, an improved composite cellulose separator is prepared by integrating with bis[(3-methyldimethoxysilyl)propyl]-polypropylene oxide (BSPPO) and carboxylated cellulose nanofibers (C-CNF) via polymerization crosslinking. Multiple interactions between BSPPO and C-CNF synergistically generate high porosity, thereby refining the microporous architecture and providing more space for electrolyte uptake. This result greatly facilitates uniform Na + deposition and fast Na + transport through the BSPPO chain-mediated pore channels. Meanwhile, multiple interconnected networks formed by BSPPO and C-CNF substantially enhance the mechanical strength, with a tensile strength of 22.3 MPa. The optimal separator exhibits an intrinsic resistance of 0.89 Ω, an ionic conductivity of 1.52 mS cm −1 , and a Na + transfer number of 0.72, all markedly superior to those of the commercial cellulose separator. In Na||hard carbon half-cell tests, the separator delivers outstanding rate capability and long-term cycling stability, maintaining a discharge capacity of 68.1 mAh g −1 after 100 cycles at a high rate of 2C. This work tailors composite cellulose separators by combining BSPPO and C-CNF to reinforce their structure and functions, which can help to advance commercial cellulose separator for better practical SIBs applications.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 86
·83356-83365
·
IF 3.289
Xiaran Miao,Feng Tian,Jinyou Lin,Hui Li,Xiuhong Li,Fenggang Bian,Xiangzhi Zhang
Cellulose nanofibrils (CNF) with polymorphs of cellulose I and II (i.e. CNF-I and CNF-II) are different in morphology, aspect ratio, the density of functional groups and mechanical properties, which influence the reinforcement effect for polymer composites. In this work, two kinds of CNFs were fabricated from jute fibers by the TEMPO-mediated oxidation method followed by a mechanical disintegration. Highly transparent polyvinyl alcohol (PVA)/CNF composite films containing varying contents of CNF were obtained via evaporating solution blends of PVA and CNF. The mechanical and thermal properties of the PVA/CNF composites were extensively investigated. CNF-I led to a higher Young's modulus of the as-prepared composites than CNF-II did at the same content. The high density of functional groups on the surface of CNF-II enhances the interface interaction between PVA molecular chains and CNF, which result in a better toughness of the resultant composites. Meanwhile, both of CNF-I and CNF-II can improve the thermal stability and lower the degradation rate of PVA. This work provides an insight into the design of CNF reinforced composites with desired properties by altering the polymorphs of CNF.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
BIOMACROMOLECULES
·
2016
·
IF 5.583
Jun You,Jinfeng Cao,Yanteng Zhao,Lina Zhang,Jinping Zhou,Yun Chen
Polysaccharide-based injectable hydrogels have several advantages in the context of biomedical use. However, the main obstruction associated with the utilization of these hydrogels in clinical application is their poor mechanical properties. Herein, we describe in situ gelling of nanocomposite hydrogels based on quaternized cellulose (QC) and rigid rod-like cationic cellulose nanocrystals (CCNCs), which can overcome this challenge. In all cases, gelation immediately occurred with an increase of temperature, and the CCNCs were evenly distributed throughout the hydrogels. The nanocomposite hydrogels exhibited increasing orders-of-magnitude in the mechanical strength, high extension in degradation and the sustained release time, because of the strong interaction between CCNCs and QC chains mediated by the cross-linking agent (β-glycerophosphate, β-GP). The results of the in vitro toxicity and in vivo biocompatibility tests revealed that the hydrogels did not show obvious cytotoxicity and inflammatory reaction to cells and tissue. Moreover, DOX-encapsulated hydrogels were injected beside the tumors of mice bearing liver cancer xenografts to assess the potential utility as localized and sustained drug delivery depot systems for anticancer therapy. The results suggested that the QC/CCNC/β-GP nanocomposite hydrogels had great potential for application in subcutaneous and sustained delivery of anticancer drug to increase therapeutic efficacy and improve patient compliance.
研究领域:
材料科学
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生物医学工程
·
药剂学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
De-Fa Hou,Zheng-Ying Liu,Ling Zhou,Huang Tan,Wei Yang,Ming-Bo Yang
Cellulose is an abundant feedstock with renewability and biodegradability . However, it is still challenging to manufacture natural cellulose products by environmentally friendly thermoplastic processing methods. Herein, we proposed a green approach for the heterogeneous preparation of thermoplastic cellulose grafted polyurethane (RCP-g-PU) from amorphous regenerated cellulose paste (RCP) via hydroxyl/isocyanate chemistry. First, amorphous RCP was fabricated through dissolving cellulose in sodium hydroxide aqueous solution and regenerating in polyethylene glycol, resulting in the enhancement of the accessibility of hydroxy groups in cellulose chains. Subsequently, a series of thermoplastic RCP-g-PU with the melt flow temperatures ranging from 160 °C to 226 °C were feasibly synthesized by adding hexamethylene diisocyanate into RCP without using other organic solvents . Eventually, the resultant RCP-g-PU can be directly hot-pressed into transparent films with flexibility and foldability. The reported methodology represents a sustainable route to achieve thermoplastic cellulose derivatives .
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Suling Liu,Qing Zhang,Shaheng Gou,Lili Zhang,Zhiguo Wang
Deep eutectic solvents (DESs), as emerging green solvents, provide a new opportunity for the biorefinement of biomass, component extraction, and cellulose nanofibrillation. Herein, different carboxylic acid-based DESs were applied for preparation of cellulose nanofibers (CNFs) from cellulose raw materials accompanied by simultaneous esterification modifications of CNFs. The results showed that pretreatment of DESs combined with mechanical treatment can swell and esterify the cellulose materials, producing CNFs with widths less than 100 nm. The DES pretreatment temperature played important roles in the esterification modifications and nanofibrillation of cellulose. The esterification modifications of cellulose prevented the over-hydrolysis and dissolution of cellulose during the DES pretreatment, guaranteeing CNFs with high yields of 72 %–88 % and maintaining the cellulose I crystal structure. Moreover, the esterified CNFs were used as a reinforcement to prepare CNF-strengthened polylactic acid (PLA) composites. The surface esterification of the CNFs improved their dispersibility and interfacial compatibility with PLA, thereby achieving the mechanical enhancement of CNF/PLA composites.
研究领域:
材料科学
·
生物质化学
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）