Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 10
·1544-1554
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IF 4.5
Shao Xinyi,Wang Jian,Liu Zetan,Hu Na,Zhang Ruimin,Quan Cailin,Yao Xinjie,Dong Cuihua
The current SARS-CoV-2 pandemic has resulted in the widespread use of personal protective equipment, particularly face masks. However, the use of commercial disposable face masks puts great pressure on the environment. In this study, nano-copper ions assembled cotton fabric used in face masks to impart antibacterial activity has been discussed. To produce the nanocomposite, the cotton fabric was modified by sodium chloroacetate after its mercerization, and assembled with bactericidal nano-copper ions (about 10.61 mg·g −1 ) through electrostatic adsorption. It demonstrated excellent antibacterial activity against Staphylococcus aureus and Escherichia coli because the gaps between fibers in the cotton fabric allow the nano-copper ions to be fully released. Moreover, the antibacterial efficiency was maintained even after 50 washing cycles. Furthermore, the face mask constructed with this novel nanocomposite upper layer exhibited a high particle filtration efficiency (96.08% ± 0.91%) without compromising the air permeability (28.9 min·L −1 ). This green, economical, facile, and scalable process of depositing nano-copper ions onto modified cotton fibric has great potential to reduce disease transmission, resource consumption, and environmental impact of waste, while also expanding the range of protective fabrics.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xushuo Yuan,Wentao Yao,Decai Ji,Li Liu,Yanfei Lin,Heyang Zeng,Tao Jin,Kaimeng Xu,Guanben Du,Lianpeng Zhang
To achieve real-time monitoring of Au 3+ , a corn bract cellulose-based fluorescent probe MAC-1 for was synthesized. MAC-1 showed good fluorescence properties in DMF-H 2 O (1:9, v /v, pH = 7.4) solution, showed a fluorescence emission peak at 520 nm with quenching fluorescence properties for Au 3+ . The structure of MAC-1 was analyzed by SEM (Sample microstructure images), XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), 1 H NMR, Elemental analysis, EDS, Mapping and TG (Thermogravimetry) were analyzed. The fluorescence properties of the probe were also characterized by UV spectrophotometer and fluorescence spectrophotometer. The results showed that the recognition of Au 3+ by the probe MAC-1 exhibited high selectivity and high sensitivity. Moreover, it is highly resistant to interference and has a short response time, which can be rapidly responded within 1 min. In addition, to improve the practical application of the probe, the probe was prepared as a fluorescent composite film and the fluorescence effect shown by the fluorescent composite film is consistent with the fluorescence change of the probe MAC-1 itself. The fluorescent composite film also has excellent selectivity and good overall physical and mechanical properties. This study provides a meaningful reference for the detection of Au 3+ and further expands the application field of agroforestry waste.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Miao Wang,Shuai Zhang,Xiangjun Liu,Yayun Ma,Junqi Wang
A comprehensive study of alkali and alkaline earth metal (AAEM) salts including two different anions (Cl - and CH 3 COO - ) in the catalytic pyrolysis of cellulose to produce levoglucosan (LG), bio-oil, and biochar were investigated. At the same time, the catalytic pyrolysis mechanism was also speculated. The thermogravimetric analyzer (TGA) and lab-scale fixed-bed reactor system were used to determine the thermal degradation process and the pyrolysis products of LG, bio-oil, and biochar. The optimized pyrolysis parameters were obtained by using Box-Behnken design-response surface method. According to the results, AAEM salts significantly boosted the yield of biochar, as well as greatly cut down the output of LG and bio-oil. The rank of effect on LG yield was as follows: CaCl 2 , MgCl 2 > CH 3 COOK, CH 3 COONa > (CH 3 COO) 2 Mg, (CH 3 COO) 2 Ca > KCl, NaCl. Moreover, the addition of AAEM salts considerably dropped the activation energy E of cellulose pyrolysis as well as prompted microcrystalline cellulose pyrolysis under lower temperatures. This study was pivotal in deducing the pathway of cellulose pyrolysis, thereby offering critical insights to hasten the progress of biomass utilization.
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MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 18
·2300036
·
IF 2.5
Wei Zhang,Yi Sun,Yiting Xu,Xiaobo Yu,Yajin Fang,Fei Liu,Haining Na,Jin Zhu
Fabrication of fluorescent cellulose with aggregation-induced emission (AIE) characteristics is usually achieved by grafting tetraphenylethylene (TPE) to the cellulose backbone using TPE derivatives with highly active functional groups such as carboxylic, isothiocyanate, and alkynyl groups. However, besides the complicated synthetic routes of these TPE derivatives, conversion of hydroxyl groups in the cellulose chain to more reactive groups such as amine or azide groups is usually involved, and the resulting products have a degree of substitution (DS) of TPE lower than 0.08. Herein, a facile one-pot strategy for the grafting of a TPE group to the cellulose backbone with high DS of up to 0.22 in a CO 2 switchable solvent under mild reaction conditions is reported. The hydroxyl groups in the cellulose are in situ converted to cellulose carbonate intermediately during the dissolution step. Subsequently, nucleophilic substitution between the intermediate and a halogenated TPE derivative with bromine atom as leaving group is carried out to achieve the effective grafting of TPE. The synthetic route for this promising TPE derivative is much more convenient than those of TPE derivatives reported in previous studies. This work suggests a new and facile pathway for the synthesis of high-emission fluorescent cellulose with AIE functionality.
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NANO
·
2022
·
IF 1.438
Qian Sun,Jin Yang,Zulin Da,Yongsheng Yan
With the rapid development of the chemical industry, oil/ water emulsion separation is receiving global attention. It is particularly important to find a low-cost, convenient, economical and environmentally friendly method to prepare superhydrophilic/ underwater superoleophobic membranes for oil/ water emulsion separation. In this paper, discarded cigarette butts were used as raw materials, combined with chitosan to form a superhydrophilic/ underwater superoleophobic membrane through a phase inversion method. The performance of CA/CS membrane is controlled by adjusting the ratio of cellulose acetate and chitosan. The cigarette butts are washed in ethanol solution to remove impurities to obtain cellulose acetate, and then chitosan and polyvinylpyrrolidone (PVP) are added to build the micro–nano structure on the surface of the membrane. The prepared CA/CS composite membrane was superhydrophilic/ underwater superoleophobic. For the oil-in-water emulsion, the filtrate of the CA/CS membrane can hardly see the oil droplets through electron microscope. CA/CS membrane has a higher emulsion permeation flux (more than 340 L m − 2 h − 1 ) and a higher separation efficiency (more than 97.1%). In addition, the membrane has good reusability within 10 cycles. This method can reduce the harm of cigarette butts to nature and can also be used for oil–water separation. The method of turning discarded cigarette butts into treasure is worthy of social advocacy.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Kaiyue Zhang,Di Wu,Limin Chang,Wenhao Duan,Yong Wang,Wenjuan Li,Jianglei Qin
The application of biodegradable hydrogels in medical field has drawn great attention because their networked structure provided ideal spaces for drug loading and cell growth. In this research, the boronic acid was coupled onto carboxyethyl cellulose (CMC) to synthesize boronic acid grafted CMC (CMC-BA) conveniently and self-healing hydrogel was fabricated with polyvinyl alcohol (PVA) crosslinking through dynamic boronic ester bond. The CMC-BA/PVA hydrogel showed good biocompatibility and could be degraded by cellulase and in vivo . The hydrogel formed fast fit for localized injection to cover the irregular wounds and localize the antitumor drugs to the tumor site. The in vivo wound repairing experiment revealed the hydrogel could form airtight adhesion to the wound site to reduce blood loss and accelerate the wound repairing rate. The hydrogel as a drug release carrier also reduced the acute in vivo toxicity of DOX with antitumor performance well preserved through a controlled release profile. Based on the above advantages, the CMC-based hydrogel with boronic ester connection should have great potential in biomedical areas with profitable future.
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MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
An Liu,Shu He,Jie Zhang,Jia Liu,Wei Shao
Although zeolitic imidazole framework-8 (ZIF-8) has been widely used as the organic dye adsorbent, a suitable carrier is needed to solve the issues of low stability and poor dispersibility in water. Poly(acrylic acid) was grafted onto cellulose to prepare MAA aerogel with more active sites for MB adsorption which was applied as the carrier for ZIF-8. Here, ZIF-8/MAA composite aerogel was prepared by in situ growing the ZIF-8 nanoparticles onto the walls of the pores of MAA aerogel. The prepared adsorbent was characterized by SEM, FTIR, and TG analysis . A series of adsorption experiments were carried out to optimize the various parameters affecting MB adsorption behaviors (the adsorbent dosage, solution pH, initial MB concentration, adsorption time, and adsorption temperature). The experimental data for the adsorption process followed a pseudo-secondary kinetic model, more in line with the Langmuir isotherm (R 2 = 0.992), with a maximum adsorption capacity of 1492.99 mg/g. The prepared adsorbent exhibited great reusability even after five repeated cycles of adsorption-regeneration. The adsorption mechanism was discussed in depth. Thus, the prepared ZIF-8/MAA aerogel can be used as an environmentally friendly, efficient, stable and reusable adsorbent for MB in wastewater treatment.
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Gels
·
2022
·Vol. 9
·期 1
·10
·
IF 4.432
Yanjin Tang,Yuhan Lai,Ruiqin Gao,Yuxuan Chen,Kexin Xiong,Juan Ye,Qi Zheng,Zhenxing Fang,Guangsheng Pang,Hoo-Jeong Lee
Functional aerogels composed of regenerated cellulose and tungsten oxide were fabricated by implanting tungsten-oxide nanodots into regenerated cellulose fiber. This superfast photochromic property benefitted from the small size and even distribution of tungsten oxide, which was caused by the confinement effect of the regenerated cellulose fiber. The composite was characterized using XRD and TEM to illustrate the successful loading of tungsten oxide. The composite turned from pale white to bright blue under ambient solar irradiation in five seconds. The evidence of solar absorption and electron paramagnetic resonance (EPR) demonstrated the fast photochromic nature of the composite and its mechanism. Furthermore, carbon fiber filled with preferential growth tungsten-oxide nanorods was obtained by annealing the photochromic composite in a N2atmosphere. This annealed product exhibited good absorption across the whole solar spectrum and revealed an excellent photothermal conversion performance. The water evaporation rate reached 1.75 kg m−2h−1under one sun illumination, which is 4.4 times higher than that of pure water. The photothermal conversion efficiency was 85%, which shows its potential application prospects in seawater desalination.Keywords:functional aerogels;regenerated cellulose;color center;solar absorbent;desalination
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Junkang Lin,Chenglong Fu,Wenchao Zeng,Dong Wang,Fang Huang,Shan Lin,Shilin Cao,Lihui Chen,Yonghao Ni,Liulian Huang
Cellulose and its derivatives have received much attention as green raw materials to prepare ultrafiltration membranes. However, the inferior performance (low rejection, poor anti-fouling etc.) hinders their development. To improve the preparation of cellulose based ultrafiltration membrane and its performance, in this study, we developed a facile strategy to fabricate cellulose acetate ultrafiltration membranes by adding methyl acetate (MAC, as a co-solvent) to N, N-dimethylacetamide (DMAc). The results show that the pore morphologies of the membrane can be regulated by adjusting the DMAc to MAC ratio. Under optimal conditions, the pure water flux can reach 188.0 L/m 2 h, with the BSA rejection ratio of 95.2 %, which is about 20 % higher than the control. Furthermore, the anti-fouling and long-term stability of ultrafiltration membranes have improved significantly. The above results support the conclusion that using a mixed solvent by adding MAC to DMAc is effective for tuning the pore structure of cellulose-based ultrafiltration membrane, hence, improving its performance for water purification .
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Zhe Sun,Yudi Kuang,Mehraj Ahmad,Yang Huang,Sha Yin,Farzad Seidi,Sha Wang
Hydrogel with 3D networks have shown great potential for ion transportation and energy conversion. However, the micron size pores of hydrogel greatly limit the ion selectivity and energy conversion performance. Here, we report a bacterial cellulose (BC) derived hydrogel membrane with double-network (DN) and tailored ion transport channels by rationally filling acrylic acid (AAc)- co -acrylamide (AAm)- co -methyl methacrylate (MMA) polymers into BC hydrogel micropores. Fabricated AAM/BC DN hydrogel membrane displays a unique hierarchical interconnected porous structure and 3D cation transport channels. From the results, the maximum power density reached up to 7.63 W·m −2 at 50-fold salinity gradient under alkaline conditions (pH 11). Interestingly, the power density of 45.5 W·m −2 was achieved through acid-base neutralization reaction. Furthermore, hydrogel successfully obtained a power density of 28.4 W·m −2 from a mixed system of paper black liquor wastewater/seawater. The results of this investigation suggested the enormous potential of BC-based nanofluidic membrane in sustainable osmotic energy conversion.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Lili Dong,Suxia Ren,Xiuqiang Zhang,Yantao Yang,Qinglin Wu,Tingzhou Lei
In recent years, nanocellulose-based bioinorganic nanohybrids have been exploited in numerous applications due to their unique nanostructure , excellent catalytic properties, and good biocompatibility. To the best of our knowledge, this is the first report on the simple and effective synthesis of graphene/cellulose (RGO/CNC) matrix-supported platinum nanoparticles (Pt NPs) for nonenzymatic electrochemical glucose sensing. The Pt/RGO/CNC nanohybrid presented a porous network structure, in which Pt NPs, RGO, and CNCs were integrated well. Here, cellulose nanocrystals act as a biocompatible framework for wrapped RGO and monodispersed Pt nanoparticles , effectively preventing the restacking of graphene during reduction. The superior glucose sensing performance of Pt/RGO/CNC modified glass carbon electrode (GCE) was achieved with a linear concentration range from 0.005 to 8.5 mM and a low detection limit of 2.1 μM. Moreover, the Pt/RGO/CNC/GCE showed remarkable sensitivity, selectivity, durability, and reproducibility. The obtained results indicate that the CNCs-based bioinorganic nanohybrids could be a promising electrode material in electrochemical biosensors.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Yabi Yang,Shuang Liu,Guoliang Zhang,Ziqing Hu,Liang Jin,Bingqing Quan,Xiaoyun Hao,Hao Wu,Xiaofan Ji,Xiang Lu
The design of cellulose nanofiber (CNF)-encapsulated polyethylene glycol (PEG)-based phase change composites (PCCs) has shown great promise toward overcoming the phase transition process’s leakage. Whereas, the leakage is inescapable for intricate industrial occasions such as extrusion and collision. Thereby it’s requisite to monitor the products’ leakage. Herein, a fluorophore with aggregation-induced emission (AIE) effect was employed to prepare fluorescent PCCs. In detail, Pmix2 was picked to dip into the skeleton CNF6 to construct CNF6/Pmix2 with dim green. What’s more, the free fall of 500 g weight, 983 times of CNF6/Pmix2′s weight, was applied to the materials to simulate the possible force that occurred in real industrial processes. Obviously, CNF6/Pmix2′s leakage is seen on dark occasions, whereas CNF6/PEG’s leakage trace is hardly observed, evidencing CNF6/Pmix2 possesses the capacity of monitoring leakage. Additionally, CNF6/Pmix2 displays excellent thermal energy storage and reusability, illustrating promising energy conversion and storage applications.
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