CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Sheng-Jie Chen,Ming-Jun Zhu,Si-Ying Cui
High salinity waste, such as food waste, is difficult for microbial utilization as high salt increases cellular osmosis. In this study, a novel cellulolytic halotolerant (<150 g/L salinity) strain Clostridium thermopalmarium HCD (halotolerant and cellulose-degrading strain) was screened from paper sludge, which obtained 108.47 and 42.53 mM hydrogen from cellobiose under 30 and 80 g/L NaCl respectively. HCD could improve 25.14 % hydrogen production of MT (a mixed thermophilic Clostridiales ) consortium from co-substrates of pretreated sugarcane bagasse and food waste as bio-enhancer. Microbial community analysis showed that the inoculation of HCD profoundly changed the original community structure and dominant species of MT with the prolongation of fermentation time, leading to increase utilization of co-substrates and higher hydrogen production. In response to high salinity, HCD regulated the cell shape from a slender rod to a stubby one, balancing the high osmotic pressure. Furthermore, HCD could secrete and transport betaine as the main response to high salinity. Betaine could mediate the Na/K pump-like transport system, especially Na + /H + antiporter to balance the intracellular osmotic pressure. Betaine could also relieve cell membrane damage, improving the transportation of extracellular P ions to the intracellular. Moreover, betaine could increase the levels of extracellular polymers and intracellular ATP. This study provided a halotolerant hydrogen-producing strain and its halotolerant mechanism, which paid a solid foundation for the utilization of high-salt waste biomass.
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Materials Today Nano
·
2024
·
IF 8.2
Kaiyu Li,Yuan Liang,Xiaojie Lv,Shuohan Huang,Yanping Wang,Yong He,Yumin Xia
The conductive modification of cellulose substrates can be achieved through the attachment of nanocarbons (NCs), enabling the production of a wide range of wearable eco-friendly sensors. However, the economical fabrication of durable wearable devices on cellulose, without disrupting the conjugated structure of NCs, poses an enduring challenge. In this work, we report a stable dispersion system of NCs by using an imidazole type poly (ionic liquid) (PIL-Cl). Various kinds of cellulose substrates only require simple immersion in the dispersion liquid to attain conductivity. The paper and cotton fabric conductors fabricated in this manner exhibited exceptional flexibility, bendability, and electrical stability. We designed joint motion detectors with a large strain range (GF = 1.3) by origami, in which the electrical performance remained stable after undergoing 5000 cycles of maximum deformation (−50 %–150 %). Additionally, by utilizing computer aided technology, NCs-(PIL-Cl) system can create conductive patterns in any form. Based on this, we have manufactured a range of wearable electronic sensors, including masks for monitoring respiration, touch-sensitive circuits and information transmission devices on cotton clothing. This system provides a low-cost option for the fabrication of cellulose wearable sensors, suitable for large-scale production and applications.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Qianwen Lu,Hengfeng Li,Zhijian Tan
Wearable electronics significantly impact health monitoring, clinical care, and human-machine interfaces. Eutectogels, which utilize deep eutectic solvents (DES) address the drawbacks of hydrogels, such as weight loss and poor temperature tolerance, as well as the high costs and toxicities associated with ionogels. Despite these advances, most eutectogels serve only as sensors or epidermal electrodes and rarely fulfill both functions simultaneously. In this study, we present a multifunctional eutectogel designed to function in both ways. Incorporating natural cotton cellulose nanofibers as nanofillers reinforced the tensile strength of the resultant eutectogel by 7.47 times compared to that of the pure eutectogel, reaching 4.93 MPa. This eutectogel exhibited high ionic conductivity (1.22 S m −1 ), strong adhesion (1562.2 kPa to iron), self-healing ability (80.37% strain recovery and 80.53% tensile strength recovery), a broad temperature tolerance (−40 to 80 °C), and antibacterial properties. It demonstrates high sensitivity for the real-time strain detection of human activities and accurately captures electrophysiological signals, enabling the control of a small car. This versatile eutectogel has excellent potential for use in flexible wearable electronics.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Siyu Ge,Tian Tian,Zurong Du,Yapeng Dun,Jun Zhang,Haoran Wu,Ting Yu
Flexible supercapacitors offer significant potential for powering next-generation flexible electronics. However, the mechanical and electrochemical stability of flexible supercapacitors under different flexibility conditions is limited by the weak bonding between neighboring layers, posing a major obstacle to their practical application. In this paper, natural coniferous pulp cellulose was successfully modified with ethylenediamine and NiSe 2 /Cell-NH 2 /MoS 2 cellulose flexible electrodes (NCMF) were fabricated by phase transfer and hydrothermal methods. The amino-modified cellulose (Cell-NH 2 ) acts as a “bridge” between NiSe 2 and MoS 2 , significantly enhancing the interfacial bonding strength of the flexible electrode. The integrated flexible electrode exhibited a high area capacitance (2475 mF/cm 2 ), strong tensile strength (10.3 MPa), and excellent cycling stability (92.1 % capacitance retention after 2500 cycles). The sandwich-structured monolithic supercapacitor achieved both a high electrode capacitance (56.78 F/cm 2 ) and a high energy density (1971.53 μWh/cm 2 ), while maintaining long cycling life (72.73 % capacitance retention after 2000 cycles) and large deformation capability. This makes it suitable for stable power supplies in electronic products and opens new possibilities for the flexible wearable industry. This technology enables stable power supplies for electronic products and paves the way for advancements in the flexible wearable industry.
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Polymers
·
2024
·Vol. 16
·期 13
·1784
·
IF 4.7
Mengyao Cao,Yanglei Chen,Jie Sha,Yanglei Xu,Sheng Chen,Feng Xu
Triboelectric nanogenerators (TENGs) show promising potential in energy harvesting and sensing for various electronic devices in multiple fields. However, the majority of materials currently utilized in TENGs are unrenewable, undegradable, and necessitate complex preparation processes, resulting in restricted performance and durability for practical applications. Here, we propose a strategy that combines straightforward chemical modification and electrospinning techniques to construct all-cellulose nanofiber-based TENGs with substantial power output. By using cellulose acetate (CA) as the raw material, the prepared cellulose membranes (CMs) and fluorinated cellulose membranes (FCMs) with different functional groups and hydrophobic properties are applied as the tribopositive and tribonegative friction layers of FCM/CM-based triboelectric nanogenerators (FC-TENGs), respectively. This approach modulates the microstructure and triboelectric polarity of the friction materials in FC-TENGs, thus enhancing their triboelectric charge densities and contact areas. As a result, the assembled FC-TENGs demonstrate enhanced output performance (94 V, 8.5 µA, and 0.15 W/m2) and exceptional durability in 15,000 cycles. The prepared FC-TENGs with efficient energy harvesting capabilities can be implemented in practical applications to power various electronic devices. Our work strengthens the viability of cellulose-based TENGs for sustainable development and provides novel perspectives on the cost-effective and valuable utilization of cellulose in the future.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
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IF 8.4
Mingmin Jia,Xiong-Fei Zhang,Yicheng Zhou,Hengyang Mao,Yijiang Zhao,Jianfeng Yao
In this work, Amine-functionalized CNF/UiO-66 (CNF–NH 2 /UiO-66) composite membranes were fabricated by incorporating UiO-66 nanoparticles in the CNF–NH 2 matrix. The CO 2 -facilitated transfer channels can be constructed in the CNF–NH 2 /UiO-66 composite membrane. As a natural polymer material, CNF–NH 2 would absorb water and form a gel-like structure under humidification. The adsorbed water can convert CO 2 into bicarbonate ions (HCO 3 − ) through the catalysis of amino groups on CNF–NH 2 . Moreover, in CNF–NH 2 /UiO-66 composite membranes, HCO 3 − could quickly migrate to the permeate side promoted by the porous UiO-66, facilitating CO 2 transport. The optimum membrane gave a CO 2 permeability of 257.0 Barrer with a CO 2 /CH 4 ideal selectivity of 71.3.
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FOOD HYDROCOLLOIDS
·
2011
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IF 2.659
Changdao Mu,Jimin Guo,Xinying Li,Wei Lin,Defu Li
Glycerol-plasticized gelatin edible films with a new kind of dialdehyde polysaccharide , dialdehyde carboxymethyl cellulose (DCMC) as crosslinking agent are successful prepared using casting techniques. The mechanical properties, thermal stability, light barrier properties, swelling behavior as well as water vapor permeability (WVP) of the gelatin–DCMC films are investigated. The results indicate that the addition of DCMC causes tensile strength (TS) and thermal stability to increase and elongation at break (EB) to decrease, suggesting the occurrence of crosslinking between gelatin and DCMC. The light barrier measurements present high values of transparency at 280 nm and low values of transparency at 600 nm of the gelatin–DCMC films, indicating that gelatin–DCMC films are very transparent (lower in transparency value) while they have excellent barrier properties against UV light. Moreover, the values of transparency at 280 nm increase with the increased DCMC and glycerol content, suggesting the potential preventive effect of gelatin–DCMC films on the retardation of product oxidation induced by UV light. Furthermore, the addition of DCMC can greatly decrease the water vapor permeability (WVP) and equilibrium swelling ratio (ESR) down to values about 1.5 × 10 −10 g m/m 2 s Pa and 150%, revealing the potential of DCMC in reducing the water sensitivity of gelatin-based films. In common for hygroscopic plasticizer in edible films, the addition of glycerol gives increase of EB and WVP and decrease of thermal stabilities and ESR of the gelatin–DCMC films.
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SENSORS AND ACTUATORS B-CHEMICAL
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2012
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IF 3.898
Zhan Zhou,Qianming Wang
Here two novel terbium silica xerogels (H a and H b ) were assembled into cellulose hydrogels and two transparent films with narrow emission were successfully fabricated as fluorescent probes . We have found that the nitrite addition entailed efficient quenching effects of the photoluminescence intensity, contrasting the stable emissions upon exposure to other comparative ions (SO 4 2− , CO 3 2− , ClO 3 − , NO 3 − , AcO − , OH − , F − , Cl − , Br − , I − , K + , Na + , Fe 2+ , Mn 2+ , Pd 2+ , Cd 2+ , Co 2+ , Cu 2+ and Fe 3+ ). The recognition process may be ascribed to the coordination interaction between terbium ions and NO 2 − . Linear functions for spectroscopic titrations were obtained in both hydrogel-based films and the new soft sensors exhibit a dynamic range for determination of nitrite from 1 × 10 −5 to 1 × 10 −4 M.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2010
·Vol. 119
·期 2
·1204-1210
·
IF 1.203
Shaoping Yang,Shiyu Fu,Hao Liu,Yiming Zhou,Xueyun Li
Environment-friendly carboxymethyl cellulose (CMC) hydrogel beads were successfully prepared using epichlorohydrin (ECH) as a crosslinking agent in the suspension of fluid wax. There was an ether linkage formed between ECH and CMC, which was identified from bands in FTIR spectra of the prepared hydrogel. The prepared hydrogel beads with diameters about 4 mm were apparently spherical and fully transparent. The X-ray diffraction (XRD) spectra indicated that the adsorption of metal ion onto the oxygen atom of carboxyl group led to change in crystallinity patterns of hydrogels. The scanning electron microscope (SEM) images clearly showed that the hydrogels had an internal porous structure. The adsorption capacity increased as initial concentrations of metal ions and the pH value of metal ion solution increased. Freundlich and Langmuir isotherm models were employed to analyze the data from batch adsorption experiments. There are vey good correlation coefficients of linearized equations for Langmuir model, which indicated that the sorption isotherm of the hydrogel beads for metal ions can be fitted to the Langmuir model. The maximum adsorption amount of hydrogel beads for metal ions is 6.49, 4.06, and 5.15 mmol/g for Cu(II), Ni(II), and Pb(II), respectively. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
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CARBOHYDRATE POLYMERS
·
2012
·
IF 3.628
Haiping Li,Wanguo Hou,Xiuzhi Li
The electrostatic and hydrogen bonding interactions between xanthan gum (XG) and semisynthetic cationic cellulose (JR400) in aqueous solution are investigated via stability map, FT-IR spectra, thermogravimetric analysis, potentiometric measurement and rheological method. The stability map shows three regions, a stable region with XG as the major component, a flocculated region and another stable region with JR400 as the major component. The stability of mixing system depends on both the concentration fraction of JR400 ( f JR ) and the overlapping concentrations of these two polymers. In the region near the stoichiometric f JR , the mixture shows stoichiometric flocculation, which is independent of the total polymer concentration. However, in the regions away from the stoichiometric f JR , the mixtures are stable when the concentration of major polymer component is higher than its overlapping concentration. In stable regions, the electrostatic and hydrogen bonding interactions can enhance the viscosity of mixing system at appropriate f JR values.
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ChemSusChem
·
2010
·Vol. 4
·期 1
·79-84
·
IF 4.767
Zhi Wang,Qiang Lu,Xi-Feng Zhu,Ying Zhang
Graphical It′s not diamond, it′s zirconia: SO 4 2− /ZrO 2 is an efficient catalyst for the production of levoglucosenone by fast pyrolysis of cellulose admixing catalysts. The optimal temperature for preparation of levoglucosenone is in the range of 320–350 °C. In the presence of the SO 4 2− /ZrO 2 , the levoglucosenone content of pyrolysis liquid is greatly increased at 335 °C compared to pure cellulose. Sulfated zirconia was employed as catalyst for fast pyrolysis of cellulose to prepare levoglucosenone (LGO), a very important anhydrosugar for organic synthesis. The yield and the selectivity of LGO were studied in a fixed-bed reactor at different temperatures and cellulose/catalyst mass ratios. The experiments of catalyst recycling were also carried out. The results displayed that from 290 to 400 °C, the liquid and solid accounted for more than 95 wt % of products, and the higher temperature led to more liquid and less solid products. The introduction of SO 4 2− /ZrO 2 could promote cellulose conversion and LGO production. The temperature had a similar effect on the yield and selectivity of LGO at different cellulose/catalyst mass ratios. The maximum yield was obtained at 335 °C. Although the structure of the parent ZrO 2 was retained after recycles, which was confirmed by X-ray diffraction and N 2 adsorption–desorption measurements, the activity of SO 4 2− /ZrO 2 could only be partially recovered by simply calcination. The catalytic activity decrease could be mainly attributed to SO 4 2− leaching, and the activity could be restored by further impregnation of H 2 SO 4 .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 7
·1-14
·
IF 2.8
Wu Honghao,Wang Xiwen
In this work, the lithium iron phosphate (LiFePO 4 ) /multi-walled carbon nanotubes (MWCNTs)/ketjen black (KB)/regenerated cellulose (RC) freestanding composite electrodes were prepared by using 1-ethyl-3-methylimidazolium diethyl phosphate ([Emim]DEP) /dimethyl sulfoxide (DMSO) as the solvent system for the application of lithium-ion battery cathode. The electrodes were characterized and analyzed by Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscope (EIS), and constant-current charge/discharge. The results indicate that the electrodes possess a three-dimensional layered network structure comprising RC and MWCNTs intertwined and lapped. The LiFePO 4 and KB particles can be inlaid and distributed on the surface of the network structure or among the pores, which enhances the multi-directionality and conduction rate of electron conduction, as well as the utilization efficiency of LiFePO 4 . The electrode comprising a 3:1 ratio of MWCNTs to KB and a LiFePO 4 loading of 40 wt% performed best overall, with initial discharge specific capacities of 177.12, 143.02, and 127.12 mAh·g −1 at rates of 0.1, 2, and 5 C, respectively. Moreover, the capacity retention was 99.82% after 50 cycles at 0.1 C and 94.58% after 200 cycles at 2 C. The Coulombic efficiency remained above 97% during 50 cycles at 0.1 C and above 98% during 200 cycles at 2 C. The electrodes exhibit favorable electrochemical performance and flexibility, which hopefully match the evolution of electrochemical energy storage devices toward lightweight and flexibility.
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