JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·Vol. 31
·期 8
·3573-3584
·
IF 5.3
Chen Zixuan,Sun Fei,Zhao Huakun,Yu Tao,Yang Weidong,Li Qian,Li Yan
Poly (lactic acid) (PLA) is a bio-based polymer that is derived from renewable plant resources, such as corn, cassava, and other crops. It has a wide range of potential applications. However, currently, the PLA produced on an industrial scale is a thermoplastic polymer, which has poor mechanical strength and poor flame retardancy. These mediocre properties limit its potential uses in housings, structural interior of automotives, and packaging. The present study aimed to overcome the limitations of thermoplastic PLA by developing a synthesis route for producing thermosetting PLA with improved flame retardancy. The synthesis involved reacting 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) with itaconic acid (IA), polymerizing the product with pentaerythritol (PENTA) and lactic acid (LA) oligomer, and end-functionalizing with methacrylic anhydride (MAAH). The success of the synthesis was confirmed by analyzing the results of Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance ( 1 H NMR) analysis. The curing kinetics is elaborated by Kissinger’s and Crane’s methods with outstanding fitting. Increasing the LA-to-PENTA ratio results in higher molecular weight and larger arm length, leading to less crosslinking density and lower phosphorus content. A 10:1 LA-to-PENTA mole ratio contributes to UL-94 V1 ranking, 24% limit oxygen index (LOI), 183 kJ/g heat release capacity (HRC), and 21.4 kJ/g total heat release (THR) indicating the admirable flame retardancy. The development of flame-retardant thermosetting PLA could be a significant step forward in expanding its potential applications and improving its properties.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Wang Xianhui,Pei Chunlei,Zhao Zhi-Jian,Chen Sai,Li Xinyu,Sun Jiachen,Song Hongbo,Sun Guodong,Wang Wei,Chang Xin,Zhang Xianhua,Gong Jinlong
Redox catalysts play a vital role in chemical looping oxidative dehydrogenation processes, which have recently been considered to be a promising prospect for propylene production. This work describes the coupling of surface acid catalysis and selective oxidation from lattice oxygen over MoO 3 -Fe 2 O 3 redox catalysts for promoted propylene production. Atomically dispersed Mo species over γ-Fe 2 O 3 introduce effective acid sites for the promotion of propane conversion. In addition, Mo could also regulate the lattice oxygen activity, which makes the oxygen species from the reduction of γ-Fe 2 O 3 to Fe 3 O 4 contribute to selectively oxidative dehydrogenation instead of over-oxidation in pristine γ-Fe 2 O 3 . The enhanced surface acidity, coupled with proper lattice oxygen activity, leads to a higher surface reaction rate and moderate oxygen diffusion rate. Consequently, this coupling strategy achieves a robust performance with 49% of propane conversion and 90% of propylene selectivity for at least 300 redox cycles and ultimately demonstrates a potential design strategy for more advanced redox catalysts.
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JOURNAL OF MATERIALS RESEARCH
·
2023
·Vol. 38
·期 9
·2339-2348
·
IF 2.7
Zhou Jiajie,Li Longyang,Zhu Lijing,Zeng Zhixiang,Zhang Jinwei,Lin Cunguo
When the impact force of the droplets is low (the Weber number is low), the influence of the solid surface and the lubricating liquid cannot be ignored. Here, slippery liquid-infused surfaces were prepared by hydrochloric acid etching and low surface energy triethoxy-1H,1H,2H,2H-tridecafluoro-n-octylsilane modification on Al sheets, then infiltrated with different lubricating liquids. The bounce behavior of droplets is studied under the condition of controlling the Weber number is 19. The results show that the lubricating liquids can be locked when the roughness is sufficient. The adhesion of a slippery liquid-infused surface is related to the surface tension and viscosity, which is lower, and it is more beneficial to droplet bounce. But lubricating fluids with too low viscosity are more likely to be lost from the microstructure after being struck by droplets. It is significant for the application of slippery liquid-infused surfaces in low impact. Graphical Abstract
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International Journal of Environmental Science and Technology
·
2023
·Vol. 20
·期 12
·13399-13410
·
IF 3.1
Xiong H.,Peng S.,Zhang B.
Nonionic surfactants with ideal surface properties and lower ecotoxicities have been highly attended in metal bioleaching and pollutant bio-treatment in environmental science field. In this study, both Acidithiobacillus ferrooxidans HX3 and Tween 80 (or Triton X-100) presence in cultures, bio-production and development of schwertmannite as a potential metal scavenger were investigated. To explore their correlations, the resulting ferric oxyhydroxides under various surfactant levels (lower/optimal/higher ones for Gp I/II/III treatments) were identified by many characterization methods. Result showed that after 48 h of normally bacterial reproduction, surfactant-rich cultures with Tween 80 more than 50 mg/L (25 mg/L for Triton X-100) could only achieve down 80% of ferrous oxidation percent and 10 7 cells/mL of cell numbers, while those with lower surfactant level were ahead 12 h. Culture pH values decreased to about 2.4 (or 2.0) from initially 2.8. All initial ferric oxyhydroxides were only pincushion-schwertmannite spheres. When cells sequentially reproduced within 36 h–48 h, presence of surfactants (except for Triton X-100 at 75 mg/L) could induce schwertmannite-pincushion assembling on developed spherical particles with a little of diamond-jarosite. And then during bacterial stability state (48 h–72 h), the pincushion assemblages on developed schwertmannite-spheres would disappear, following occurrence of more jarosite amount. Obviously, schwertmannite stability and morphological evolvement were affected by type and level of the added surfactants. These results will give a convincing proof for understanding biomineralization principles of iron minerals in natural environments with nonionic surfactants.
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JOURNAL OF NANOBIOTECHNOLOGY
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2023
·Vol. 21
·期 1
·1-14
·
IF 10.2
Yu Hao,Li Yijia,Pan Yining,Wang Hongning,Wang Wei,Ren Xiaobin,Yuan Hang,Lv Ziru,Zuo Yijia,Liu Zhirong,Lin Wei,Yao Qingqing
With increased diabetes incidence, diabetic wound healing is one of the most common diabetes complications and is characterized by easy infection, chronic inflammation, and reduced vascularization. To address these issues, biomaterials with multifunctional antibacterial, immunomodulatory, and angiogenic properties must be developed to improve overall diabetic wound healing for patients. In our study, we prepared porous poly (L-lactic acid) (PLA) nanofiber membranes using electrospinning and solvent evaporation methods. Then, sulfated chitosan (SCS) combined with polydopamine-gentamicin (PDA-GS) was stepwise modified onto porous PLA nanofiber membrane surfaces. Controlled GS release was facilitated via dopamine self-polymerization to prevent early stage infection. PDA was also applied to PLA nanofiber membranes to suppress inflammation. In vitro cell tests results showed that PLA/SCS/PDA-GS nanofiber membranes immuomodulated macrophage toward the M2 phenotype and increased endogenous vascular endothelial growth factor secretion to induce vascularization. Moreover, SCS-contained PLA nanofiber membranes also showed good potential in enhancing macrophage trans-differentiation to fibroblasts, thereby improving wound healing processes. Furthermore, our in vitro antibacterial studies against Staphylococcus aureus indicated the effective antibacterial properties of the PLA/SCS/PDA-GS nanofiber membranes. In summary, our novel porous PLA/SCS/PDA-GS nanofiber membranes possessing enhanced antibacterial, anti-inflammatory, and angiogenic properties demonstrate promising potential in diabetic wound healing processes.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-8
·
IF 16.6
Chen Biao,Huang Wenhuan,Zhang Guoqing
Pure organic room-temperature phosphorescence (RTP), particularly from guest-host doped systems, has seen exponential growth in the last several years due to their high modulation flexibility, and yet challenges remain with respect to mechanistic elucidations and advantageous applications. Here we show that by constructing guest-host doped RTP systems from chiral components, namely, chiral amino compound-modified phthalimide hosts and naphthalimide guests, a chiral-selective RTP enhancement phenomenon can be observed. For example, R -enantiomeric guests in R -enantiomeric hosts produce strong red RTP afterglow while no appreciable RTP could be observed in the S-R guest-host counterpart. An unprecedented RTP intensity difference > 10 2 folds with the ability to distinguish an enantiomeric excess of 98% could be achieved. Temperature-dependent measurements suggest that a chirality-dependent energy transfer process may be involved in the observed phenomenon, which can be harnessed to extend the RTP application to the chiral recognition of amino compounds, such as amino alcohols.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 18
·51876-51886
·
IF 5.8
Yu Weiting,Zhu Jieyun,Chen Sizhuo,Tang Juntao,Ye Jiexu,Song Shuang
The electrocatalytic reduction of CO 2 towards CO is one of the most desirable routines to reduce atmospheric CO 2 concentration and maintain a global carbon balance. In this work, a novel porous NiCu-embedded ZIF-derived N-doped carbon nanoparticle (NiCu@NCNPs) catalyst has been identified as an active, highly selective, stable, and cost-effective catalyst in CO 2 reduction. A CO selectivity as high as 100% has been achieved on NiCu@NCNPs which is the highest reported to date. The particle current density of CO on NiCu@NCNPs is around 15 mA cm –2 under the optimized potential at −0.9 V vs. RHE. The NiCu@NCNPs electrode also exhibits excellent stability during the five sequential CO 2 electroreduction experiments. The superior catalytic performance of NiCu@NCNPs in CO 2 RR can be related to its microstructure with high electrochemical surface area and low electron transfer resistance. Furthermore, a kinetic analysis has shown the formation of intermediate *COOH is the rate-determining step in CO 2 RR towards CO. According to the results of density functional theory (DFT) calculations, a low Gibbs-free energy change (∆ G ) for the rate-determining step leads to the enhanced catalytic performance of CO 2 RR on NiCu@NCNPs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-11
·
IF 2.8
Feng Jingmin,Zhang Yajuan,Lu Yang,Shan Yiting,Guo Xiang,Zhou Hongqing
In this study, CaO–B 2 O 3 –SiO 2 (CBS) glass–ceramics were prepared and compounded with different contents of ZrSiO 4 . The sintering behavior, phase composition, microstructure, dielectric properties, thermal properties, and mechanical properties of this CBS glass–ceramic composite ZrSiO 4 ceramic system were investigated. The results show that CBS glass–ceramic can be sintered densely at 750 °C. However, the crystallinity is unexpectedly low and the dielectric properties are greatly damaged. Surprisingly, the addition of ZrSiO 4 improved the dielectric constant of the composites and achieved a dielectric adjustable in the range of 6.0–7.8. When the composite was sintered at 830 °C for 15 min with 35% ZrSiO 4 addition, the bulk density of the composite increased to 2.93 g/cm 3 . The dielectric constant measured at a high frequency of 13 GHz was 6.93 and the dielectric loss of 1.66 × 10 –3 . Accordingly, the addition of ZrSiO 4 reduced the thermal expansion coefficient of the composite to 6.1 ppm/°C and increased the flexural strength of the composite to 248 MPa.
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Scientific Reports
·
2023
·Vol. 13
·期 1
·1-13
·
IF 4.6
Ma Peipei,Li Jinlei,Huang Qing,Wei Shijie,Ge Hurong,Wang Zhizhong
To investigate the potential mechanism of resveratrol in anti-fatigue by network pharmacology and molecular docking, and to investigate the anti-fatigue efficacy of resveratrol through in vitro animal experiments. Resveratrol action targets and fatigue-related targets were obtained using various databases. The anti-fatigue targets of resveratrol were obtained using the Venn diagram, uploaded to the String database, imported into Cytoscape 3.7.1, and constructed into a Protein-protein interaction network. The target genes were then subjected to Gene ontology and Kyoto encyclopedia of gene and genome enrichment analysis. Molecular docking verification was performed on the binding ability of the core target to resveratrol. Using swimming-trained mice as exercise models, exhaustive swimming time and fatigue-related biochemical parameters were used as indicators to investigate the effects of resveratrol on exercise endurance and energy metabolism. 104 anti-fatigue targets and 10 core target genes of resveratrol were obtained. KEGG analysis enrichment included AGE-RAGE signaling pathway in diabetic complications, Human cytomegalovirus infection, and Pathways in cancer. Molecular docking showed that the core target genes TP53, PIK3R1, AKT1, PIK3CA, and MAPK1 had good binding activity to resveratrol. Animal experiments showed that resveratrol could prolong the exhaustive swimming time of endurance-trained mice (P < 0.01), decrease aspartate aminotransferase, alanine aminotransferase, uric acid, blood lactate (P < 0.01), decrease blood urea nitrogen (P < 0.05), increase the liver glycogen, muscle glycogen (P < 0.01). Conclusion: Resveratrol has the characteristics of multiple targets and multiple pathways in anti-fatigue; resveratrol can enhance exercise endurance in mice.
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CELLULOSE
·
2022
·Vol. 30
·期 4
·2597-2610
·
IF 6.123
Liu Hongxia,Fan Wei,Miao Yaping,Dou Hao,Shi Yang,Wang Shujuan,Zhang Xinqing,Hou Lin,Yu Xichen,Lam Su Shiung,Ge Shengbo
Worldwide, 45 million tons of waste cotton textiles are produced annually, of which 75% is burned and buried, leading to serious environmental pollution. In this study, a method for directly preparing colored regenerated cellulose fibers (CRCFs) from dyed cotton textile waste (DCTW) was demonstrated. The tensile strength of CRCFs reached 226 MPa, which was equivalent to that of commercial viscose fibers. CRCFs exhibited excellent color fastness and hydrophilicity. In addition, CRCFs can be reprocessed into secondary CRCFs. The tensile strength of secondary CRCFs was 14.64% less than that of the primary CRCFs due to the reduction in the polymerization degree of secondary CRCFs; however, it also can be woven into fabrics. The exploration of the secondary utilization of CRCFs provides an experimental basis for prolonging the service life of DCTW. This approach of preparing CRCFs achieves closed-loop recycling of waste colored cellulose textiles and prevents environmental pollution caused by decoloring and dyeing.
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International Journal of Environmental Research
·
2022
·Vol. 17
·期 1
·1-18
·
IF 3.229
Huang Wen,Tang Yaxin,Zhang Xueping,Chen Jiao,Lu Yixin,Luo Jinqi,Zhang Jianqiang
Biochar could be used as a green and efficient carbon-based material for activation of PMS to degrade antibiotics. In this study, different carbon structured bio-chars were prepared from sheep manure by varying the pyrolysis method and conditions. The biochar was characterized by Brunauer–Emmett–Teller, electron microscopy scanning, elemental analysis and N 2 adsorption–desorption isotherms to establish the conformational relationships between different carbon structures and the degradation of sulfadiazine (SDZ) by activated PMS. The results showed that the pyrolysis temperature accelerates the generation of biochar pore structures, the nitrogen atmosphere facilitates the generation of mesoporous structures, and the appropriate residence time effectively reduces the polarity and enhances the aromaticity of the biochar. When the dosages of G600-1.0 h and PMS were 0.6 and 0.5 g·L −1 , respectively, 10 mg·L −1 of SDZ could be completely removed within 50 min and still had good activation efficiency after 3 cycle tests. The results of the radical quenching test, electron paramagnetic resonance analysis and X-ray photoelectron spectroscopy indicated that the defective structure on the surface of G600-1.0 h activates the radical pathway of PMS (SO 4 ·− , ·OH and O 2 ·− ), while the C=O group and graphitic nitrogen promote the production of the non-radical pathway ( 1 O 2 ). In the degradation of SDZ, the radical pathway was dominated by the production of SO 4 ·− . In summary, a new biochar-based PMS activator was designed and prepared by optimizing the pyrolysis conditions, with a view to providing new technological support for a green, efficient and low-cost treatment method for antibiotic wastewater, as well as a new option for the resource utilization of manure sources. Graphical Abstract
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JOURNAL OF PLANT GROWTH REGULATION
·
2019
·Vol. 39
·期 1
·358-369
·
IF 2.179
Cui Dandan,Mo Yuncai,Zeng Lingjie,Feng Kai,Feng Xiaoyun,Huang Jialing,He Mengling,Zhang Xiaoyuan,Teng Xifeng
The response of Dendrobium officinale Kimura et Migo ( D. officinale ) to continuous UV-B irradiation at different carbon to nitrogen ratios (C/N ratios) was investigated. Seedlings grown for 60 days were incubated under aseptic conditions with UV-B irradiation (15.6 µW cm −2 ) at different C/N ratios: control group (CK; C/N 30 without UV-B), UV-B + CK (C/N 30 with UV-B irradiation, similarly hereafter), UV-B + C/N 120, UV-B + C/N 60, UV-B + C/N 15, UV-B + C/N 10, UV-B + C/N 7.5. Growth parameters (the defoliation rate and the sprout number), photosynthetic pigments (carotenoids, chlorophyll a and chlorophyll b), total polysaccharides, total alkaloids, and activities of antioxidant enzymes were determined following 4, 8, 12, and 16 days of continuous UV-B exposure. Results indicated that UV-B irradiation increased the defoliation rate and the content of carotenoids, total polysaccharides and total alkaloids, as well as the activities of antioxidant enzymes. Conversely, UV-B irradiation reduced the sprout number and chlorophyll content in D. officinale . Compared with UV-B + CK, lower C/N ratio treatments (UV-B + C/N 15, UV-B + C/N 10 and UV-B + C/N 7.5) enhanced the defoliation rate and sprout number, but decreased antioxidant enzyme activities and total polysaccharide content during the whole period, and reduced total alkaloid content after 4 days of UV-B exposure. Following initial UV-B irradiation, lower C/N ratios increased the contents of carotenoid and chlorophyll b, while after 8 days, a reversal in carotenoid content was observed, and after 12 days, a reversal in chlorophyll b content was observed. Optimizing the C/N ratio (C/N 60) resulted in lower defoliation rate, higher photosynthetic pigments and total polysaccharides, and increased activities of antioxidant enzymes, whereas no significant change in sprout number and total alkaloid content was recorded under long-term UV-B irradiation. Furthermore, the UV-B + C/N 120 treatment negatively affected D. officinale in terms of an increased defoliation rate and reduced sprout number, photosynthetic pigments, and total alkaloids. Therefore, results suggested that an appropriate C/N ratio (C/N 60) could ameliorate the adverse effects of continuous UV-B irradiation on D. officinale .
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