POLYMER COMPOSITES
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2024
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IF 4.8
Jingliang Xu,Zhiyuan Wang,Asraful Alam,Leiyu Liu,Shen Zhang
This study presents a novel hydrophobic lignocellulosic bioplastic from corn stover reinforced by oxidized cellulose and in situ regenerated lignin. Cellulose-lignin mixture as a matrix was obtained by acid-recyclable deep eutectic solvent (DES) pretreatment of corn stover in mild conditions. Triethoxy(octyl)silane (C 14 H 32 O 3 Si) was employed to improve the water stability of the bioplastic by vapor deposition. The results show that the hydrophobic bioplastic has a high tensile strength, measuring 62.36 MPa. The water contact angle of the bioplastic was increased from 8.50° to 121.9° after hydrophobic modification. We prepared oxidized cellulose-reinforced cellulose paper by different particle size distributions of oxidized cellulose to investigate the reinforcement of oxidized cellulose. The tensile strength of oxidized cellulose cellulose paper increased from 14.41 to 21.18 MPa with the addition of oxidized cellulose. The zeta potential of oxidized cellulose is −47.99 mV, which shows a more negative charge due to carbonyl groups. The repulsive force of oxidized cellulose contributes to the formation of a brick-and-mortar microstructure with cellulose-lignin mixture. It demonstrates that oxidized cellulose can act as bio-adhesives and has a good toughening effect on the mechanical properties of bioplastic. Highlights Lignocellulosic bioplastic was prepared by DES pretreatment of corn stover. Oxidized cellulose was used to reinforce the lignocellulosic bioplastic. The tensile strength of the bioplastic was 62.36 MPa after the reinforcement process. Trieth-oxy(octyl)silane was employed to improve water stability. The water contact angle of the bioplastic was increased from 8.50° to 121.9°.
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Nature Communications
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2018
·Vol. 9
·期 1
·1-9
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IF 12.353
Pei Songfeng,Wei Qinwei,Huang Kun,Cheng Hui-Ming,Ren Wencai
Graphene oxide is highly desired for printing electronics, catalysis, energy storage, separation membranes, biomedicine, and composites. However, the present synthesis methods depend on the reactions of graphite with mixed strong oxidants, which suffer from explosion risk, serious environmental pollution, and long-reaction time up to hundreds of hours. Here, we report a scalable, safe and green method to synthesize graphene oxide with a high yield based on water electrolytic oxidation of graphite. The graphite lattice is fully oxidized within a few seconds in our electrochemical oxidation reaction, and the graphene oxide obtained is similar to those achieved by the present methods. We also discuss the synthesis mechanism and demonstrate continuous and controlled synthesis of graphene oxide and its use for transparent conductive films, strong papers, and ultra-light elastic aerogels.
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CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Qinglong Zeng,Xiaofeng Xie,Xiao Wang,Yan Wang,Guanhong Lu,David Y.H. Pui,Jing Sun
The ever increasing problem of air pollution has provoked the research and development of highly-efficient photocatalysts. Herein, Ag nanowires@TiO 2 composite photocatalyst with improved photocatalytic performance was fabricated by a facile one-step solvothermal procedure. The formation of one-dimensional Ag nanowires@TiO 2 core-shell nanostructures could not only broaden the light-absorbing range of TiO 2 catalysts through the surface plasmon resonance effect of Ag nanowires , but also enable the effective separation of photoinduced electron-hole pairs. Under the irradiation of a 260 W fluorescent lamp, the composite with 0.5 wt% Ag nanowires exhibited the highest photocatalytic activity in short contact time (4.8 min), and the corresponding gaseous acetaldehyde removal ratio was 72%, which was much higher than that of bare TiO 2 (37%). The photocatalyst also showed ultrastable activity in the 15 weeks usage, which ensured their practical applications in the air purification field. An in-depth mechanism of the photodecomposition of acetaldehyde was proposed on the basis of the electron spin resonance (ESR) tests and the scavenger experiments. O 2 − reactive radicals was found to play a predominant role in the oxidation and decomposition of acetaldehyde. The outstanding performance of the composite materials and the thoroughly understanding of the reaction mechanism would cast light on the purposively design and optimization of TiO 2 -based catalysts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Xinyi Zhu,Bowen Li,Yimin Fan,Juan Yu
Achieving both low solid content and printability for cellulose nanofiber inks remains challenging. In this study, mild hydroxyl-yne click chemistry was used to chemically crosslink dipropiolate ester of polyethylene glycol (DA-PEG) with 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) oxidized cellulose nanofibers (TOCN), forming TOCN-PEG (TP) inks. This crosslinking network allowed for effective viscosity control, with TP ink viscosity increasing by 128.5 % upon PEG addition. As a result, direct ink writing (DIW) 3D printing of TOCN was feasible at low concentrations (1.0–2.0 wt%). The printed TP hydrogel scaffolds exhibited high mechanical strength, bearing loads over 500 times their weight, and fluorescence due to conjugated double bonds and carbonyl groups. Additionally, cell viability rates exceeded 96 % at 24 h and 93 % at 48 h, indicating non-cytotoxicity (viability >80 %). Thus, the easily customizable TP inks prepared via hydroxyl-yne click chemistry hold promise for various applications, especially in 3D-printed bio-cellular scaffolds.
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EUROPEAN POLYMER JOURNAL
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2025
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IF 6.3
Rui-Dong Wang,Yi-Fei Zhang,Xiao-Long Han,Yu-Kun Gao,Ting-Ting You,Peng-Gang Yin
This work explores the design and optimization of polyrotaxane-based solid polymer electrolytes (SPEs) by adjusting crosslinker, composition, and polyrotaxane coverage ratio. By incorporating poly (ethylene glycol) (PEG) crosslinkers and refining their molecular weight and loading, we developed SPEs exhibiting high ionic conductivity (7.05 × 10 −5 S/cm at 30 °C), excellent flexibility (elongation at break over 270 %) and thermal resistance above 150 °C. Investigations into polyrotaxane with reduced coverage ratios revealed limitations in mechanical properties and ionic conductivity, emphasizing the importance of PEG crosslinker and the need of a robust cross-linked network. This study underscores the potential of polyrotaxane cross-linked networks for advanced SPE applications and provides insights for future design strategies in the field.
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Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Guobao Ning,Huan Liang,Linjiang Guo,Xiaokang Lu,Lin Xiao,Tianle Qi,Hui Zhao,Can-Peng Li
The application of single-atom nanozymes in the removal of organic dye pollution by advanced oxidation process (AOPs) have been widely concerned. However, the application of single-atom nanozymes in AOPs is rarely reported. In this work, a kind of Fe-and nitrogen-codoped carbon (Fe-N-C) with peroxidase-like and laccase-like activities was prepared by calcining Fe-doped MOF, then the chiral peptides were introduced into single-atom nanozymes, and chiral single-atom nanozymes (L-Au@FeNC) were successfully prepared. The L-Au@FeNC can effectively activate PMS to degrade different kinds of organic dyes and also shows high cycle stability. In addition, the results of quenching experiment and electron paramagnetic resonance (EPR) test show that 1 O 2 produced during PMS activation plays an important role in the degradation of organic dyes, and O 2 ·- , ·OH, and SO 4 ·- are also produced during PMS activation, suggesting that the degradation of selected organic dyes include radical and non-radical pathways. It should be noted that L-Au@FeNC showed higher activity than D-Au@FeNC in enzyme-like activity (laccase-like and peroxidase-like) experiment and organic dye degradation, the results of molecular docking simulation indicated that it may be due to the better binding force of L peptide to the substrate of enzyme-like reaction and organic dye than D peptide. This chiral single-atom nanozymes provide a new idea for the application of organic dye degradation and enzyme-like catalysis design.
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CARBOHYDRATE POLYMERS
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2024
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IF 10.7
Wenjing Li,Jilun Guan,Huayang Fang,Yuheng Jiang,Yu Zhong,Shaohong Shi,Fangchao Cheng
Cellulose possesses numerous favorable peculiarities to replace petroleum-based materials. Nevertheless, the extremely high hygroscopicity of cellulose severely degrades their mechanical performance, which is a major obstacle to the production of high-strength, multi-functional cellulose-based materials. In this work, a simple strategy was proposed to fabricate durable versatile nanocellulose films based on sustaining CO 2 capture and in-situ calcification. In this strategy, Ca(OH) 2 was in-situ formed on the films by Ca 2+ crosslinking and subsequent introduction of OH − , which endowed the films with high mechanical strength and carbon sequestration ability. The following CO 2 absorption process continuously improved the water resistance and durability of the films, and enabled them to maintain excellent mechanical properties and promising light management ability. After a 30-day CO 2 absorption process, the water contact angle of the films can be increased from 43° to 79°, and the weight gain rate of the films in a 30 h water-absorption process can be sharply decreased from 331.2 % to 52.2 %. The films could maintain a high tensile strength of 340 MPa, and result in a CO 2 absorption rate of 3.5 mmol/g cellulose after 30 days. In this study, the improvement of durability and carbon sequestration of nanocellulose films was achieved by a simple and effective method.
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ACS Applied Nano Materials
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2024
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IF 5.3
Mingdong Xu,Yongling Yu,Guojun Shi,Panming Jian,Xu Hou,Enxian Yuan
Although single metal sites on graphitic carbon nitride (g-C3N4) are extensively employed in the catalysis field, the related study is based on the flat g-C3N4 surface model, which is far beyond the reality of the curved structure involved in g-C3N4. Herein, g-C3N4 nanorods with diameters of 9.0 and 7.0 nm are synthesized via the hard template approach to support single-atom Co for the catalytic oxidation of cyclohexane. Comprehensive characterizations, combined with theoretical calculations, find that the curved structure would broaden the space of g-C3N4 interlayers, modulate the electronic structure, and reduce the coordination number of atomic Co. The mechanism study reveals that compared with Co atoms on a flat g-C3N4 surface, the low-coordinated Co atoms anchored on a curved g-C3N4 surface are capable of enhancing the reactant adsorption and facilitating the oxygen dissociation, thereby boosting the catalytic cyclohexane oxidation. The cyclohexane conversion on resultant Co/g-C3N4-9 nm reaches up to 22.4% at the overall selectivity of above 95% under mild reaction conditions, outperforming state-of-the-art nonprecious metal-based catalysts. The present work not only offers a synthesis strategy of the effective single-atom metal catalysts for the cyclohexane oxidation but also sheds light on the origin of the enhanced catalytic performance of curved g-C3N4-based catalysts.
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NEW JOURNAL OF CHEMISTRY
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2024
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IF 2.7
Yu Gao,Siyu Liu,Xu Huang,Weiwen Lu,Jian Huang,Hua Zhang,Yong Zhang,Jinhua Wang,Shanshan Xi,Jun Liu,Tao Luo
Considering the difficulty in recovering powder materials and the low photocatalytic efficiency, we have developed a series of Fe-MOFs (MIL-53(Fe), NH2-MIL-53(Fe), MIL-101(Fe), NH2-MIL-101(Fe) and MIL-100(Fe)) on pure iron mesh. In this study, the growth of Fe@MILs on the iron mesh was confirmed through SEM, XRD, and FT-IR characterizations. Among the photocatalytic experiments, Fe@NH2-MIL-53(Fe) and Fe@NH2-MIL-101(Fe), which are amine-functionalized, showed improved photocatalytic activity. This improvement is believed to be due to the combination of NH2 functionality and electron transfer to the Fe-O cluster centre, resulting in dual excitation pathways. Furthermore, Fe@MIL-100(Fe) showed the highest performance for the removal of Cr(VI), with over 92% of Cr(VI) being removed in the fifth photocatalytic cycle. Mechanism indicated that the close connection between the compact structure of Fe-MOFs and effective electron migration. Additionally, sacrificial reagent experiments identified two important species for Cr(VI) reduction: electrons (e-) and superoxide radicals (O2-). The photocatalytic recovery tests showed a 97% recovery rate of Cr(VI). This work offers a novel solution for the treatment of water sources contaminated with Cr(VI).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Shuyu Chen,Zhengkai Wu,Xueying Cheng,Lu Chen,Yunning Chen,Yingna Guo,Changhua Wang,Qingkun Shang
In this work, we used a simple hydrothermal method to in-situ grow Zn 3 In 2 S 6 on MIL-100(Fe) octahedra, and obtained a MIL-100(Fe)@Zn 3 In 2 S 6 Z-scheme heterojunction photocatalyst. We systematically studied its performance in degrading phenol and p-nitrophenol (PNP) under visible light. MIL-ZIS 6 -2 can remove 89.1 % of phenol within 120 min and nearly 100 % of PNP within 60 min. Its photocatalytic activity to the degradation of phenol is 30.7 times and 1.7 times higher than that of MIL-100(Fe) and Zn 3 In 2 S 6 , respectively. And the photocatalytic activity to degrade PNP is 18.2 times and 1.4 times higher than MIL-100(Fe) and Zn 3 In 2 S 6 . Further research was conducted on its band structure and photocatalytic response mechanism through photoelectric performance, ultraviolet photo-electron spectroscopy, and electron spin resonance spectrometer testing. The results showed that the formation of Z-scheme heterojunction not only increased the specific surface area of the composite photocatalyst, enabling it to provide more reaction sites, but also effectively suppressed the recombination of photogenerated holes and electrons, improving the redox ability of the photocatalyst. This work provides a new perspective for constructing efficient Zn 3 In 2 S 6 -based composite photocatalysts and addressing environmental issues.
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ACS Applied Nano Materials
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2024
·
IF 5.3
Hongyan Du,Kaihe Lv,Mei-Chun Li,Jinsheng Sun,Xianbin Huang,Yuan Geng,Haokun Shen,Yecheng Li,Muhammad Arqam Khan
Drilling fluid additives that maintain wellbore stability have attracted considerable attention because of the frequent occurrence of wellbore instability accidents during drilling operations. However, achieving long-term wellbore stability in practical applications remains challenging. Herein, we report the application of chitin-based amphiphobic nanocomposites (PFTMS@ChNCs/SiO2) to maintain the wellbore stability of oil-based drilling fluids (ODFs). The PFTMS@ChNCs/SiO2 was prepared using a template approach, generating silica shells on the surface of chitin nanocrystals via the sol–gel method, followed by modification with 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (PFTMS). The PFTMS@ChNCs/SiO2 exhibited excellent thermal and chemical stability; even after heating in hot air at 200 °C for 24 h or soaking in hot fluids at 150 °C for 7 d, the contact angle of water and oil on the PFTMS@ChNCs/SiO2 remained above 120°, making them suitable for the harsh drilling fluid conditions. The shale treated with PFTMS@ChNCs/SiO2 demonstrated remarkable liquid-repelling properties and maintained good mechanical strength even after prolonged immersion in high-temperature fluids. Moreover, incorporating PFTMS@ChNCs/SiO2 into ODFs improved their performance, including enhanced rheological properties, better filtration control, and improved mud cake quality. Filtration tests showed a 39.6% reduction in fluid loss, whereas the filtration medium permeability decreased to 0.211 × 10–4 mD. This study presents a promising method for wellbore stabilization in ODFs and a direction for chitin nanocrystals in oil and gas engineering applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Haiying Wei,Jinsheng Rui,Min You,Xiaochun Wang,Yangxun Wang,Chengwen Zhu,Mengtao Ma,Huining Xiao
Fruits are susceptible to ethylene ripening and microbial infestation, which can lead to spoilage and further significant economic losses. Thus, using functional preservation materials is an effective controlling technology to improve the post-harvest quality and extend the shelf life of fruits. Hence, a dual-function cellulose-based paper with exceptional antibacterial efficiency, favourable ethylene removal performance, improved mechanical and hydrophobic properties was prepared by covalently grafted antibacterial guanidine salt and surface-modified ethylene scavenger. When the amount of guanidine salt grafted and ethylene scavenger is 1.85 wt% and 1.5 g·m −2 , respectively, the prepared cellulose paper exhibited about 99 % ethylene conversion and killing efficiency with no leaching, which extending the post-harvest avocado preservation time to 20 days at room temperature. Packaging with the preservation paper effectively reduced hardness and consumption of soluble solids in avocado during storage, maintaining their appearance and nutritional quality. These findings highlight the excellent preservation capabilities of the dual-function paper, making it a promising material for fruit and vegetable preservation in small and medium planting areas and households.
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