ENERGY & FUELS
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2018
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IF 3.024
Chenglong Hou,Yusong Wu,Tao Wang,Xinru Wang,Xiang Gao
The substantial increase of the atmospheric CO2 concentration over the last few decades has steered toward research on direct air capture (DAC). DAC is one of the mobile-source carbon capture and storage (CCS) processes that is variant from the conventional point-source CCS in terms of easing the CO2 concentration levels and promoting negative carbon emission. We propose here a sustainable material based on the quaternization of bamboo fiber and the implication in DAC. The quaternized bamboo cellulose could adsorb CO2 at a medium relative humidity (RH) of 60–80%, with the efficiency of quaternary ammonium groups over 0.65. The CO2 capacity at higher RH strikingly decreased, which indicates the moisture-swing characteristics, and that was further validated by a desorption ratio of 0.70 under humid gas purge. The unique phenomenon that a dry atmosphere (e.g., RH < 20%) is not favored by adsorption was revealed and could be attributed to the hydrophobic feature of the sorbent inherited from natural lignocellulose. The results suggest that quaternized cellulose with a low cost may open up new possibilities for the utilization of moisture-swing CO2 adsorbents in damp circumstances.
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RENEWABLE ENERGY
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2019
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IF 5.439
Jiao Sun,Xin-an Xie,Di Fan,Xin Wang,Weiting Liao
Cellulose liquefaction in supercritical ethanol with 2,2,6,6-Tetramethylpiperidinooxy (TEMPO) was carried out in a stainless autoclave. The influence of process parameters on bio-oil (BO) and platform chemicals, mainly including the dosage of TEMPO, reaction temperature and reaction time, were investigated. Characterization of liquefaction products was explored by fourier transform infrared (FTIR) and gas chromatography-mass spectrometry analysis (GC-MS). The maximum yield of BO (57.98%) was obtained from cellulose liquefaction at 320 °C, 4 g TEMPO and moderate time of 60 min. It showed that the conversion rate and yield of BO was significantly improved by 46.14% and 31.87% due to temperature and TEMPO respectively. The relative contents of dominant platform chemicals in bio-oil were as follows approximately: ketones > esters > alkanes > alcohols > acids. The total yields of ketones enhanced markedly (from 20.00 to 41.83%) with the increasing of TEMPO. The results showed that TEMPO catalyst under appropriate reaction conditions improved the selectivity of platform chemicals with carbonyl, which had an obvious contribution on the converting of ketones.
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ACS Applied Materials & Interfaces
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2019
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IF 8.456
Wei Zhao,Zihao Feng,Zhenhua Liang,Yanfeng Lv,Fukang Xiang,Chuanyin Xiong,Chao Duan,Lei Dai,Yonghao Ni
Vitrimer, the third category of polymer materials, combines the properties of traditional thermosets and thermoplastics and has gained much interest from industry since the first report in 2011. Currently, many researchers focus on the exploration of new chemistry for novel vitrimer synthesis but pay less attention to the fabrication of vitrimer composites based on known vitrimer systems. The latter can not only largely decrease the cost of vitrimers but also provide a facile way to increase the variety of vitrimer-based materials and extend the applications of vitrimers in different fields. In this study, we developed a new class of vitrimer composite using polycarbonate as a matrix and natural cellulose paper as the reinforcing framework for the first time. The resultant materials possess exceptional mechanical properties and great thermal/chemical stability, simultaneously exhibiting a series of smart properties, such as shape-memory, reshaping, self-healing, and reprocessing. Noteworthily, the two main components of the resultant materials, polycarbonate and natural cellulose, can be easily recycled under mild conditions; thus, these new vitrimer composites qualify as novel green and sustainable materials.
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CARBOHYDRATE POLYMERS
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2019
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IF 6.044
Xinyue Liu,Xiaojun Qi,Yupeng Guan,Yingying He,Shuai Li,Hongxia Liu,Li Zhou,Chun Wei,Chuanbai Yu,Yunhua Chen
We report here the development of transparent and strong polymer composites reinforced by unmodified cellulose nanofibrils (CNFs) with a Pickering emulsion gelation strategy. The CNFs entangle and firmly stabilize on the surface of emulsion droplets containing polymethyl methacrylate (PMMA) solution, leading to the gelation of the emulsions. CNFs/PMMA composites were generated via vacuum filtration and solvent washing of the gel and a subsequent two-step hot pressing. The composites contained a unique self-assembled two-tier hierarchy of CNFs networks and demonstrate promising transparency, tensile strength, flexibility, and an extremely low thermal expansion. Remarkably, these properties are highly tunable with varying the concentration of CNFs and the volume ratio of the water to oil phase. This work offers a facile route to realize the well dispersion of unmodified CNFs in hydrophobic polymer matrix and achieve high performance of polymeric materials reinforced by CNFs.
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ACS Omega
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2019
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IF 2.584
Feng Shen,Shuang Sun,Jirui Yang,Mo Qiu,Xinhua Qi
A key problem in the conversion of cellulose into chemicals and fuels is the low product yield from cellulose due to its robust structure. In this work, for the first time, cellulose was pretreated with coupling of liquid nitrogen and ball milling (LN–BM) for cellulose hydrolysis. After the LN–BM treatment, the glucose yield from cellulose by HCl in water increased by almost 2 times and yield of formic acid catalyzed by H2SO4–NaVO3 was more than 3-fold that obtained from untreated cellulose. The yields were also much higher than that from the individually ball-milled cellulose. The structure variation of cellulose indicated that reduction of both crystallinity index and molecular weight contributed to improving the conversion efficiency, but the former was the dominant factor. The combination of liquid nitrogen and ball milling developed in this work is an effective and environment-friendly approach for cellulose pretreatment.
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Scientific Reports
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2017
·Vol. 7
·期 1
·1-8
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IF 4.259
Zhang Hui,Li Yuqi,Lu Zexiang,Chen Lihui,Huang Liulian,Fan Mizi
Oil-water separation has recently become a worldwide concern because of the increasing oil spill accidents and industrial oily wastewater generation. Herein, a facile method with the combined superhydrophobic coating and adhesive was used to fabricate superhydrophobic TiO 2 NPs coated cellulose sponge. The developed materials exhibited excellent superhydrophobicity (WCA = 171°) and superoleophilicity (OCA = 0°), which can separate a variety of oil-water mixtures, including chloroform, toluene, kerosene and other contaminations. A high separation efficiency up to 98.5% for chloroform-water mixture was achieved when used for gravity-driven oil/water separation test. More importantly, the as-prepared samples exhibited excellent chemical stability and mechanical abrasion resistance even towards various corrosive oil/water mixtures (such as strong acid, alkali solution and salt-water environment) or a strong abrasion by aluminium oxide sandpaper of 600 mesh. In addition, the separation efficiency remained above 93% even after 40 scratch cycles, and the materials could be reused with a stable hydrophobicity, indicating a strong potential for industrial application.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2017
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IF 4.075
Yongkang Bai,Xin Chen
Herein, a fast water responsive shape memory polymer composites based on hydroxyethyl cellulose (HEC) has been fabricated by crosslinking with graphene oxide (GO) and citric acid (CA). The swelling behavior, mechanical properties, micro-topography, thermal stability, as well as water and moisture induced shape memory performance of this composite were all fully investigated to demonstrate its functions. After crosslinking with GO and CA, the composite exhibited excellent mechanical properties with tensile strength over 100 MPa, which was nearly 4 times higher than pure HEC. Moreover, the pre-deformed composite was able to fully recover to its original shape in aqueous environment, which not only quickly happened in water (14 s), but also occurred in wet air with relative humidity about 70 within only 5 min. With such outstanding properties, we envisage that this composite could play a significant role in developing new generations of water responsive sensors, actuators and biomedical devices.
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Surfaces and Interfaces
·
2024
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IF 5.7
Xiongwei Dong,Qi Sun,Xincan Shi,Zixiong Yin,Beini Zeng,Zheng Huang,Xiang Li
Lyocell fibers, the most successful regenerated cellulose fibers, have already attracted much attention. However, the use of traditional Lyocell fibers in the field of personal protective equipment (PPE) is limited, due to the lack of antibacterial properties. Additionally, the flame-retardant properties of Lyocell fibers are also required for the specific applications. Here, we co-conjugated phosphorus flame retardants and copper-thiosemicarbazone complexes with antibacterial performance on Lyocell fibers through chemical crosslinkers. The chemical composition and morphology of our engineered Lyocell fibers were fully characterized, and their mechanical properties were also maintained. Flame retardants can import flame-retardant properties (LOI: 25.0 % - 25.7 %) to Lyocell fibers, which also show promising antibacterial activity , suppressing Escherichia coli (GIR: 20.51 % - 66.67 %) and Staphylococcus aureus (GIR: 74.19 % - 93.54 %). Such an improved sustainable formulation can be used to produce the next-generation of Lyocell-based PPE, to meet the demand for the antibacterial and flame-retardant properties of fibers in special applications.
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Journal of Cleaner Production
·
2024
·
IF 9.7
Yang Liu,Chunbao Zhou,Asif Ali Siyal,Chenglong Liu,Yingwen Zhang,Jie Fu,Huimin Yun,Jianjun Dai,Xiaotao Bi
In this paper, a cleaner pyrolysis strategy combining microwave heating, catalyst and carbon dioxide was explored for converting biomass components into higher quality products. Catalytic pyrolysis was more favorable for the decomposition and conversion of complex biomass structures. For furfural residue pyrolysis , potassium sulfate contained in sample served as the main catalytic component. Potassium sulfate promoted the increase of phenols in bio-oil. Notably, carbon dioxide atmosphere promoted the decomposition of substances and exerted a significant effect on biomass pyrolysis , which increased bio-oil yield and declined gas yield. When the pyrolysis atmosphere was changed from nitrogen to carbon dioxide, the I D /I G ratio decreased from 1.07 to 0.74, indicating that carbon dioxide decreased defect structure in biochar. Carbon dioxide enriched the porous structure and surface roughness of biochar. Also, carbon dioxide as a carrier gas was found to be more effective than nitrogen in improving the heating values of biochar and the acidity of bio-oil under carbon dioxide was lower than that under nitrogen, which was conducive to the subsequent utilization of biochar and bio-oil. Carbon dioxide promoted the production of alcohols, alkenes , and alkanes in bio-oil. Beneficially, the interaction of cellulose and lignin inhibited the release of hydrogen chloride . At last, this study also provides insights into the mechanism of catalyst and CO 2 on biomass microwave pyrolysis .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Yingqi Gu,Yucai Shen,Tinghao Wu,Fangzhou Hu,Tingwei Wang
In recent years, considerable attention has been given to the utilization of biomass for producing bio-based foams, such as starch-based foams. Despite their renewability and widespread availability, these foams still present certain drawbacks regarding their poor mechanical properties and flammability . To tackle these concerns, a metal ion cross-linking strategy was employed by incorporating calcium ions (Ca 2+ ) solution into foamed starch/cellulose slurry. Followed by ambient drying, starch/cellulose composite foam was successfully fabricated with a remarkable enhancement in various properties. Specifically, compared to the control sample, the compressive strength and modulus increased by 26.2 % and 123.0 %, respectively. Additionally, the Ca 2+ cross-linked starch/cellulose composite foam exhibited excellent heat resistance , water stability, and flame retardancy. The limiting oxygen index (LOI) reached 52 %, with a vertical combustion rating of V-0. Along with the addition of 2 phr diatomite , it demonstrated a significant enhancement on flame retardancy with a LOI of 65 %, although the apparent density of the composite foam was not low enough. This study indicated a green and simple method to obtain starch-based composite foams with enhanced comprehensive properties including thermal, water stability, mechanical, and flame retardancy, expanding their potential applications in areas such as building materials and rigid packaging.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yiyi Zhang,Minfeng Chen,Junjie Lu,Hong Ma,Wenhui Liu,Jingxuan Yu,Qinghua Tian,Junling Xu,Jizhang Chen
Aqueous zinc-ion batteries hold substantial promise, benefiting from their cost-effectiveness, high safety, and impressive power density. Nonetheless, their performance is compromised by Zn dendrites and by-product formation at the Zn anode. Hydrogel electrolytes are considered a viable solution to these issues. This study proposes to fabricate anisotropic carboxymethyl cellulose hydrogel electrolyte with aligned channels through a straightforward directional freezing technique, aiming to simultaneously achieve good mechanical properties and large ionic conductivity. Meanwhile, Zn(ClO 4 ) 2 is introduced into hydrogel electrolyte to establish ternary hydrogen-bonding network, so as to enhance frost resistance. Thanks to these benefits, the anisotropic hydrogel electrolyte (denoted as Ani-hydrogel) manifests improved Zn 2+ ion transfer, expedited desolvation process, favored planar Zn 2+ ion diffusion, and promoted interfacial kinetics. Accordingly, Zn dendritic growth and parasitic reactions can be efficiently impeded, contributing to significantly improved reversibility of Zn stripping/plating. With the use of Ani-hydrogel electrolyte, the duration of Zn//Zn cell is extended to 1200 h under 2 mA cm −2 and 2 mAh cm −2 , and the Zn//Cu cell can be stably operated for 300 cycles. The Zn//MnO 2 battery with Ani-hydrogel electrolyte delivers superior cyclability at both room temperature and –10 ℃. This study underlines the importance of anisotropic architecture for hydrogel electrolytes.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Bang An,Mingcong Xu,Wenye Sun,Chunhui Ma,Sha Luo,Jian Li,Shouxin Liu,Wei Li
Cellulose nanocrystals (CNCs)-based stimuli responsive photonic materials demonstrate great application potential in mechanical and chemical sensors. However, due to the hydrophilic property of cellulose molecular, a significant challenge is to build a water-resistant photonic CNCs material. Here, inspired by butterfly wings with vivid structural color and superhydrophobic property, we have designed a CNCs based superhydrophobic iridescent film with hierarchical structures. The iridescent colored layer is ascribed to the chiral nematic alignment of CNCs, the superhydrophobic layer is ascribed to the micro-nano structures of polymer microspheres. Specially, superhydrophobic iridescent CNCs film could be used as an efficient colorimetric humidity sensor due to the existence of ‘stomates’ on superhydrophobic layer, which allowed the humid gas to enter into and out from the humidity responsive chiral nematic layers. Meanwhile, superhydrophobic iridescent films show out-standing self-cleaning and anti-fouling performance. Moreover, when the one side of the CNCs film was covered with superhydrophobic layer, the Janus film displays asymmetric expansion and bending behaviors as well as responsive structural colors in hydrous ethanol. This CNCs based hierarchical photonic materials have promising applications including photonic sensors suitable for extreme environment and smart photonic actuators.
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