CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Yingju Miao,Hongchao Luo,Manoj Pudukudy,Yunfei Zhi,Wenbo Zhao,Shaoyun Shan,Qingming Jia,Yonghao Ni
Old corrugated containers with low recyclability were used as raw materials to synthesize a series of aerogels with varying cellulose concentrations in NaOH/urea solution via a freeze-drying process. The resulting aerogels had a rich porous structure with specific surface areas in the range of 132.72–245.19 m 2 .g −1 and mesopore volumes in the range of 0.73–1.53 cm 3 .g −1 , and were tested for CO 2 sorption at ambient temperature and pressure, displaying excellent CO 2 adsorption capacities in the range of 1.96–11.78 mmol.g −1 . Furthermore, the CO 2 /N 2 selectivity of aerogels decreased with decreasing specific surface area, which was mainly caused by the decrease in CO 2 capture. In addition, the CO 2 sorption capacity of the sample with 2% cellulose content, CA-2, exceeded the values reported so far for many other sorbents with higher specific surface areas, and showed reasonable cyclic stability for CO 2 capture. Therefore, this adsorbent represents an attractive prospect for CO 2 uptake at room temperature .
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高影响因子
LANGMUIR
·
2019
·
IF 3.683
Gaihuan Ren,Xiaoyang Zheng,Hui Gu,Wenwen Di,Zengzi Wang,Yanlin Guo,Zhenghe Xu,Dejun Sun
Cellulose nanocrystals (CNCs) with excellent biodegradability are promising biomaterials for use as responsive Pickering emulsifiers. However, the high hydrophilicity of CNCs limits their emulsification ability. Some existing studies have utilized complicated covalent modification procedures to increase the hydrophobicity of CNCs. To simplify the modification process, we prepared hydrophobically modified CNCs (CNCs-M2005) via simple and controllable electrostatic interactions with thermosensitive M2005. The obtained CNCs-M2005 exhibited temperature and CO2 dual-responsive properties. Subsequently, stable oil/water Pickering emulsions were prepared using the partially hydrophobic CNCs-M2005 at 20 °C. However, demulsification occurred when the temperature increased to 60 °C. This temperature-induced demulsification resulted from the dehydration of polyethylene oxide and polypropylene oxide, causing the aggregation of the CNCs-M2005, as shown by dynamic light scattering and transmission electron microscopy experiments. In addition, demulsification was also achieved after bubbling CO2, which was attributed to the dissociation of the partially hydrophobic CNCs-M2005. The temperature and CO2 dual-responsive biosafe Pickering emulsions open up opportunity for the design of intelligent food, cosmetic, and drug delivery systems.
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POLYMER INTERNATIONAL
·
2022
·Vol. 72
·期 4
·406-415
·
IF 3.213
Qiushan Chen,Meijie Qu,Hai Wang,Ping Tang,Rongkun Liu,Rui Zhang,Yuezhen Bin
Hygroscopic thermal fibers are a kind of functional material that makes use of moisture to generate heat for fabrics. In this work, composite fibers of polyacrylonitrile (PAN) and microcrystalline cellulose (MCC) with various compositions were prepared using a solution spinning method. Besides the promotion of mechanical properties of PAN by addition of cellulose reported in previous research, this study focused on the hygroscopic thermal property of blends and spun fibers of PAN and cellulose. The content of MCC in the composite fibers has a significant effect on the hygroscopic thermal property. At a temperature of 17 °C and humidity of 90%, the maximum temperature increase of composite fibers could reach 4.9 °C. The composite fibers exhibited an obvious temperature response of on–off humidity circulation during testing. The breaking strength of the composite fibers was higher than 100 MPa. The influence of addition of cellulose on morphology, especially on the crystallinity and lateral size of PAN microfibrils, and the relationship between the morphology and hygroscopic thermal property were investigated by means of wide-angle X-ray diffraction and small-angle X-ray scattering in terms of experiment and theory. A smaller lateral size of microfibril led to a better hydroscopic thermal property. The composite fibers were expected to be used in temperature regulation clothing. © 2022 Society of Industrial Chemistry.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Li Zhong,Zhaoji Dong,Yuanquan Liu,Chuchu Chen,Zhaoyang Xu
Anisotropic hydrogels have attracted extensive attention because they are similar to natural hydrogel-like materials and exhibit superiority and new functions that isotropic hydrogels cannot. Here, we fabricated strong and tough carboxymethyl cellulose-based conductive hydrogels with oriented hierarchical structures through pre-stretching, solvent displacement induced phase separation, and subsequent ionic crosslinking immobilization. Solvent displacement made the pre-stretched carboxymethyl cellulose-based polymer network more dense and linear, while the toughness of the hydrogel was further improved under the effect of phase separation. Strong and tough hydrogels were prepared by combining pre-stretching and phase separation; the variation range (tensile strength of 2.24–6.19 MPa and toughness of 19.41–22.92 MJ/m 3 ) can be adjusted by the stretching ratio. Compared with traditional carboxymethyl cellulose-based hydrogels, the tensile strength and toughness were increased by 49 times and 15 times, respectively. In addition, the hydrogels had good underwater stability, ion cross-linking made the hydrogels have good conductivity, and the directional stratification structure gave the hydrogels conductive anisotropy. These characteristics give hydrogel sensors broad application prospects in flexible wearable devices, anisotropic sensors, and intelligent underwater devices.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Zhiyang Lin,Linhan Li,Kaige Song,Bin Yang,Guoqing Zhou,Gengrong Zhang,Jiang Teng,Erlong Wang,Xiaoqiang Liu,Fei Ling,Gaoxue Wang,Tianqiang Liu
Viruses are the most abundant microorganisms on the earth, their existence in contaminated waters possesses a significant threat to humans. Waterborne viral infections could be fatal to sensitive population including young child, the elderly, and the immune-compromised. It is imperative to remove viruses during water treatment to better protect public health, especially in the light of evidence of detection of coronaviruses genetic fragments in raw sewage. We reported bench-scale experiments evaluating the extent and mechanisms of removal of a model virus (spring viremia of carp virus, SVCV) in water by adsorption. Microspheres made by boronic acid-modified bacterial cellulose with excellent mechanical strength were successfully fabricated as packing materials for the column to remove glycoproteins and enveloped viruses from water. The synthesized adsorbent was characterized by attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), and Brunauer Emmett Teller (BET) measurement. The adsorption efficiency of glycoproteins was investigated by SDS-PAGE and the Broadford protein assay, while the binding capacity with the virus (spring viremia of carp virus) was monitored by cell culture to calculate the viral cytopathic effect and viral titer caused by the virus. The data obtained from the above experiments showed that ∼3-log removal of SVCV in 3 h, which significantly reduced the virus concentration from microspheres packed column. The present study provides substantial evidence to prove beyond doubt that material based on bacterial cellulose seems to have the potential for virus removal from water which can be extended to systems of significant importance.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Kang Zheng,Wen-Li Gong,Mingbang Wu,Lin Liu,Xiaoxue Qiu,Yaotao Shan,Juming Yao
Amphoteric cellulose porous microsphere adsorbents (ACM) with high contents of functional groups were prepared by carboxylation and amination reactions. The obtained ACM possess similar contents of carboxyl groups (1.52 mmol/g) and amino groups (1.51 mmol/g). In addition, the modified microspheres exhibited excellent mechanical properties benefiting from the dense porous structures. The ACM could simultaneously remove the cationic dye methyl orange (MO) as well as the anionic dye methylene blue (MeB) with adsorption capacities as high as 345.32 mg/g and 616.12 mg/g, respectively. Another the microspheres are also with good regeneration that the adsorption capacities still maintained more than 90 % after 8 cycles.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Chen Cheng,Rendang Yang,Yang Wang,Danning Fu,Jie Sheng,Xiaohui Guo
Bacterial cellulose (BC) lithium-ion batteries separators possess outstanding thermal dimensional stability and electrolyte wettability, but theirs nano diameter and high aspect ratio lead to poor porosity and pore size uniformity of dense BC separators, limiting the Li + transmission in the separators. In this paper, chitosan (CS) with different molecular weight was grafted onto BC (named OBCS), and a high-performance OBCS separator with excellent pore structure and tunable pore size was prepared by simple suction filtration. The spacing and dispersion uniformity of OBCS were improved by the CS grafted on BC surface, thus improving the pore structure and porosity of OBCS separators. The results showed that the obtained OBCS separators not only have excellent physicochemical properties, but also exhibit higher electrochemical performances than the commercial polypropylene (PP) separator. This work provides a new feasible strategy for improving the pore structure and porosity of nanocellulose separators.
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ACS Nano
·
2022
·
IF 18.027
Di Lu,Mengfei Li,Xiaoqing Gao,Xiao Yu,Lihong Wei,Shoujun Zhu,Yan Xu
Near-infrared circularly polarized light is attractive for wide-ranging applications. However, high-performance near-infrared circularly polarized light is challenging to realize. Here, we show that left-handed chiral photonic cellulose nanocrystal (CNC) films produced from ultrasonicated suspensions enable right-handed circularly polarized luminescence with a dissymmetry factor of −0.330 in the second near-infrared window (NIR-II). We present a theoretical analysis of the adverse effect of structural defects and luminescence intensity heterogeneity on the right-handed circularly polarized luminescence glum inside the bandgap and the occurrence of left-handed circularly polarized luminescence at the band edges. We demonstrate the potential of the chiral photonic CNC films with NIR-II circularly polarized light for cancer cell discrimination. The present work identifies key scientific questions in CNC-based circularly polarized luminescence materials research.
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Journal of CO2 Utilization
·
2022
·
IF 8.321
Ren Wu,Agula Bao
With the development of large-scale animal husbandry, large amounts of manure have brought great harm to the ecological environment, thus limiting sustainable development of human and animal husbandry. Biomass carbon has been extensively studied as an adsorption material. The rational use of cow dung as biomass has important research significance for the ecological environment. However, most previous work has directly converted biomass to carbon, which limits its application due to the poor quality stability of the biomass porous carbon and large variations in performance resulting from the complexity of biomass composition and microstructure. In this work, porous carbons were prepared after pretreatment of cow dung with NaOH-urea solution to extract cellulose and activate KOH. The results showed that the materials prepared under the optimal conditions (pre-carbonization temperature of 600 °C, cellulose-to-KOH ratio of 1:1) exhibited an ultrahigh specific surface area (1345 m 2 /g) and micropore ratio (74.24%). The capacities for adsorption of CO 2 at 273 K and 298 K and 1 bar were as high as 4.61 mmol/g and 3.26 mmol/g, respectively. This study expands the application range for cellulose and has significance for future preparation of porous carbon materials by extracting cellulose from biomass.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Wenjing Ren,Junkuo Gao,Chao Lei,Yuanbo Xie,Yurong Cai,Qingqing Ni,Juming Yao
Metal-organic frameworks (MOFs) as catalysts for the activation of peroxymonosulfate (PMS) to remove recalcitrant organic contaminants has been well reported, however, the separation of MOFs from the solution is difficult because of their powder state, which limits their applications. In the present study, zeolitic imidazole framework (ZIF) materials, ZIF-9 and ZIF-12 were pioneered to load on cellulose aerogels, and the hybrid aerogels as metal catalysts to effectively activate PMS for Rhodamine B (RB), tetracycline hydrochloride (TC) and p-nitrophenol (PNP) degradation. The hybrid aerogels/PMS system could remove PNP about 90% in 1 h, which hard to remove from water. The pH value of the solution had no effect on the degradation process, which demonstrated that the hybrid aerogels had excellent pH tolerance. In addition, the mechanism of PNP degradation was investigated by electron paramagnetic resonance (EPR) and free radical trapping methods. The results showed that PMS could effectively activate by hybrid aerogels to produce sulfate radicals (SO 4 −), hydroxyl radicals ( OH), and revealed that SO 4 − play a key role in degradation. The most important feature of hybrid aerogels is can be easily separated from the solution. The obtained results showed that the hybrid aerogels exhibit excellent recyclability, with no significant effect on degradation. The prepared hybrid aerogels are green, environmentally friendly with high catalytic efficiency. Further, the outstanding degradation of PNP demonstrates the promising prospects of hybrid aerogels as advanced oxidation process (AOP) catalysts.
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Smart Molecules
·
2026
·Vol. 4
·期 3
·e70104
·
IF 16.8
Wenjuan Wang,Minxin Wang,Changhong Lin,Geyuan Jiang,Jianfei Zhou,Dawei Zhao
Ionogels hold great promise in the fields of flexible electronics and energy devices. However, a persistent challenge lies in the inherent trade-offs among mechanical strength, ionic conductivity, and thermal stability. Here, we report a double-network cellulose-polyvinyl alcohol (Cel/PVA) ionogel via a facile [Emim]BF 4 displacement regeneration process. The ionogel with a densified supramolecular structure showed a tensile strength of 7.20 MPa, an ionic conductivity of 18.71 mS⋅cm −1 , a wide electrochemical window of 3.50 V, and outstanding thermal stability up to 135°C. Moreover, flexible sensors fabricated from this ionogel can detect various stimuli, including pressure, temperature, touch, and human pulse signals, producing detectable electrical signal outputs. In addition, the ionogel demonstrates reversible charge-discharge behavior when tested as an electrolyte in a supercapacitor configuration. This work provides an effective structural design strategy for synergistically optimizing the comprehensive performance of cellulose ionogels, paving the way for their use in next-generation flexible electronic devices.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Dev Raj Acharya,Siyu Liu,Hongyun Lu,Dafaallah Albashir,Pankaj Koirala,Ying Shi,Qihe Chen
The current requirements of food safety regulations and the environmental impact stemming from plastic packaging can only be addressed by developing suitable bio-nanocomposite films. Therefore, this study is dedicated to the fabrication of multifunctional film composed of gelatin, bacterial cellulose nanofibrils (BCNF), and black pepper essential oil nanoemulsion (BPEONE) and application for duck meat preservation. BCNF was prepared through ultrasonication of cellulose derived from Komagataeibacter xylinus . BPEONE observed spherical morphology with a diameter ranging from 83.7 to 118 nm. A film matrix containing a higher gelatin proportion than BCNF was more effective in trapping BPEONE. However, increasing the BPEONE fraction showed more surface abrasion and voids in the film morphology. A flexible film with good interaction, crystallinity, and greater thermal stability (421 °C) was developed. Nevertheless, film hydrophobicity (118.89°) declined, resulting in a notable effect on water solubility, swelling, and water vapor permeability. Moreover, the film had improved antibacterial and antioxidant activities , coupled with controlled release characteristics. Consequently, the developed film effectively retarded the lipid oxidation , inhibited microbial growth , and extended the shelf life of duck meat at refrigeration (4 °C) by 3 days, and made the film a promising alternative in the realm of bio-active packaging technology.
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