Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yujiao Zou,Chenyu Li,Ni Li,Yili Zhao
Silver nanoparticles (Ag NPs)-based nanomaterials are effective catalysts for a wide range of reactions. The recyclability and efficient catalytic properties of Ag-based nanocatalysts have been the focus of significant research interest. Herein, to address these challenges, we incorporated Fe 3 O 4 nanoparticles (NPs) into a polyvinyl alcohol/polyethyleneimine (PVA/PEI) solution to fabricate PVA/PEI@Fe 3 O 4 nanofibrous mats via electrospinning. Subsequently, the magnetic nanofibrous mats were homogenized to produce short magnetic nanofibers, which can be easily separated from the solution using a magnet. These short PVA/PEI@Fe 3 O 4 nanofibers were then immersed in an aqueous solution of AgNO 3 to adsorb and reduce Ag ions, resulting in the formation of Ag NPs with an average diameter of approximately 15 nm, uniformly dispersed on the nanofiber surface. The resulting short PVA/PEI@Fe 3 O 4 /Ag nanofibers exhibit excellent catalytic activity for the reduction of 4-NP, achieving a high conversion rate of 97.0 %. Furthermore, they demonstrated remarkable recyclability, maintaining high catalytic activity throughout six consecutive cycles. The short magnetic nanofibers proposed in this study are anticipated to facilitate the practical application of electrospun nanofibers in the catalytic removal of pollutants.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2014
·Vol. 73
·期 2
·299-305
·
IF 1.547
Wang Zhen-Zhen,Zhai Shang-Ru,Zhang Feng,Xiao Zuo-Yi,Zhai Bin,An Qing-Da
This work presented a novel, facile, cost-effective and environmentally friendly approach for the preparation of magnetic core–shell structured catalyst i.e. Fe 3 O 4 @SN–Ag (abbreviation of Fe 3 O 4 @SiO 2 –NH 2 –Ag). During the process of preparation, Ag nanoparticles were in situ generated with amino groups in the surface of Fe 3 O 4 @SN serving as green reductant and stabilizer in the absence of any additional toxic reductant or organic reagent. Magnetic core, Fe 3 O 4 , was easily prepared through solvothermal method. The subsequent coating and surface amino functionalization of SiO 2 was accomplished via one-pot sol–gel method, which was green and time-saving. What’s more, the resulting catalyst exhibited excellent catalytic property (the reaction was finished within 2 min) and reusability (reused at least seven times) in the reduction of 4-nitrophenol.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INORGANIC BIOCHEMISTRY
·
2011
·
IF 3.317
Li-Jun Tang,Xiang Chen,Yu-Na Sun,Jia Ye,Jing Lu,Ying Han,Xing Jiang,Chan-Chan Cheng,Cheng-Cheng He,Pei-Hong Qiu,Xiao-Kun Li
A new series of complexes of a ligand 4′, 7, 8-trihydroxy-isoflavone with transition metal (zinc, copper, manganese, nickel, cobalt) and selenium have been synthesized and characterized with the aid of elemental analysis , IR, electron ionization mass spectrum (EI-MS) and 1 H NMR spectrometric techniques . The compounds were evaluated for their in vitro antibacterial activities and antitumor properties. The metal complexes were found to be more active than the free ligand. Investigation on the interaction between the complexes and calf-thymus DNA (CT DNA) showed that the absorbance of CT DNA increased and the maximum peak (λ max = 260 nm) red-shifted, while the intensity of fluorescence spectra of Epstein-Bart DNA (EB-DNA) gradually weakened, which indicated that all of these metal complexes tightly combined with CT DNA.
研究领域:
生物化学
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药物化学
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2018
·Vol. 33
·期 6
·1437-1443
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IF 0.524
Zhou Wei,Fu Wenxing,Zhang Yucang
Banana pseudo-stem was liquefied in the mixture of polyhydric alcohols of polyethylene glycol (PEG400) and glycerol. Hydroxyl value of liquefied products ranged from 294.8 to 370.2 mg KOH/g and \({\bar M_n}\) was about 430. Liquefied products (LBPP) could be used as raw materials for polyurethane by reacting with 4, 4’-diphenylmethane diisocyanate (4, 4’-MDI) and PEG400 to synthesize liquefied product-based polyurethane (LBPP-PU) adhesive. To analyze in depth the creation of urethane linkage among LBPP, PEG400 and 4, 4’-MDI, factors which had effects on the residue content were all investigated. They were characterized by FT-IR and TG. The shear strength of LBPP-PU adhesive was improved when decreasing the percentage of the substitution of PEG400 by LBPP. The adhesive strength was obtained from T-peel of aspen/polyurethane adhesive joints, and the maximum lap shear strength (4.40 MPa) was obtained when 16.70% of LBPP was added to the LBPP & PEG400 system.
研究领域:
材料科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2015
·
IF 4.891
Hongling Guo,Yong Cui,Qingwen Tian,Shang Gao,Gang Wang,Daocheng Pan
The Cu2ZnSn(S,Se)4 (CZTSSe) has gained extensive attention in thin film solar cells due to their potential as a nontoxic, low-cost, and earth-abundant absorber material, and a rapid increase in power conversion efficiencies has been demonstrated in laboratory. Compared with the most successful hydrazine-based solution process, the nanocrystal-based ink method and non-hydrazine molecular precursor solution approach are more eco-friendly for fabricating high-efficiency CZTSSe solar cells. However, it is hard to obtain a complete large-grain CZTSSe absorber thin film which can facilitate the transport of photogenerated carriers while minimize grain boundary recombination. Here, we present a simple and effective strategy to significantly enhance grain growth of CZTSSe absorber layers by insetting Sb2S3, CuSbS2, and NaSb5S8 thin films. The incorporation of Sb-based thin films can induce grain growth in the selenization process, and did not produce the impurity phase confirmed by XRD patterns and Raman spectra. It was found that the order of the crystal growth promotion ability is Sb2S3 > CuSbS2 > NaSb5S8 under the same experimental conditions. The presented approach can be extended to other solution processes of fabricating CZTSSe solar cells to enhance their microstructural properties, which are critical for applications in CZTSSe absorbers with fine-grain layers.
研究领域:
材料科学
·
光伏技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PLoS One
·
2021
·Vol. 16
·期 9
·e0255504
·
IF 3.24
Jing Zhang,Zhou-Tao Pei,Ya-Ni Zhao,Meng Zhang,Li-Ling Zhang,Wen-Qiang Wang,Jing-Ya Wu,Ran Yu,Li-Wei Sun
Benzophenone (BPs) and 4-Methylbenzylidene Camphor are used as ultraviolet (UV) filters to protect the skin and hair in personal care products. The discharging of the three chemicals may endanger the receiving water ecosystem. In the present study, the mutagenicity of BP-6, BP-8, and 4-Methylbenzylidene Camphor was tested using the Salmonella typhimurium reverse mutation test (Ames test) in the system with and without rat liver microsomal preparations (S9). Four S . typhimurium strains, TA97, TA98, TA100, and TA102 were employed in the Ames tests. The mutagenicity was detected from all three chemicals. The addition of S9 increased the mutation ratios of three chemicals to four strains, except BP-6 to TA100 strain and 4-MBC to TA97 and TA98 strain. In the mixed experiment, all positive effects were detected in the absence of S9. However, the results all became negative in the presence of S9. For the mixture of BP-6 and 4-MBC, positive results were detected on four tester strains except for the TA100 strain. For the mixture of BP-6, BP-8, and 4-MBC, positive results were detected on four strains. The mixture test results showed antagonism in mutagenicity for the mixture of BP-6 and 4-MBC to TA98 and TA100 strains and the mixture of BP-6, BP-8, and 4-MBC to TA100 and TA102 strains.
研究领域:
环境科学
·
毒理学
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生物学
✓ 已验证
DOI
高影响因子
PLANT CELL AND ENVIRONMENT
·
2025
·
IF 6.3
Hongcheng Zhao,Jiarui Xu,Lin Huang,Yizhe Ding,Xianyong Lin,Chengliang Sun
Beneficial microbiomes significantly modulate root hair morphogenesis, yet the underlying signalling pathways remain unclear. Through comprehensive phenotypic analysis, we demonstrated that Azospirillum brasilense , a well-known plant-growth-promoting rhizobacteria (PGPR), promotes root hair development by prolonging the elongation period. The promotion of root hair growth by A. brasilense is attributed to increased auxin accumulation in root apices and enhanced shootward transport from the root tip, which is mediated by the accumulation of the auxin importer auxin transporter protein 1 (AUX1) in the lateral root cap and the overlying epidermis. Chemical or genetic disruption of auxin signalling abolished bacteria-induced root hair responses. Furthermore, A. brasilense upregulated several root hair-related basic helix-loop-helix family transcription factors, including root hair defective 6 (RHD6) and RHD6-LIKE 1 (RSL1), which control root hair development through RSL4. Morphological analysis revealed that while the rsl2rsl4 double mutant remained hairless after inoculation, A. brasilense successfully rescued root hair growth in rhd6rsl1 . These findings suggest that A. brasilense can bypass RHD6 to activate RSL4, which then drives root hair development dependent on ROS. Collectively, our study uncovers the core signalling components modulated by A. brasilense to fine-tune root hair responses.
研究领域:
植物生物学
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微生物学
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发育生物学
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分子信号传导
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根际细菌-植物互作
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Qianghua Ye,Fanyong Yan,Depeng Kong,Jin Zhang,Xuguang Zhou,Jinxia Xu,Li Chen
Carbon dots (CDs) were covalently linked to 4-carboxyphenylboronic acid molecules to form the 4-carboxyphenylboronic acid molecules-functionalized CDs (CPBA-CDs). The CPBA functional groups, which were reactive toward vicinal diols, could covalently bridge the catechol with the vicinal diol structures and would cause the fluorescence quenching via the static quenching mechanism. As the concentration of catechol increased, the fluorescent signal gradually decreased. The fluorescent response for catechol detection was in the linear ranges from 0.1 to 56 μM with the detection limit of 115 nM. We further demonstrated that CPBA-CDs with good biocompatibility were easily and quickly internalized by human umbilical vein endothelial cells and are particularly suitable for multicolour real-time cellular imaging.
研究领域:
分析化学
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生物医学工程
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细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
CHIRALITY
·
2018
·Vol. 30
·期 11
·1225-1232
·
IF 1.833
Yinjun Zhang,Feifei Cheng,Hongde Yan,Jianyong Zheng,Zhao Wang
The kinetic resolution of (R,S)-1-(4-chlorophenyl)ethylamine was accomplished using a commercial lipase from Candida antarctica (Novozym 435). The performance of this lipase was investigated for the enantioselective amidation of (R,S)-1-(4-chlorophenyl)ethylamine, leaving the target product (S)-1-(4-chlorophenyl)ethylamine in its unreacted form. The effects of various types of solvents and an acyl donor, the molar ratio of the substrate to the acyl donor, and the reaction temperature were studied. The optimum reaction conditions were found to result in amidation with methyl 2-tetrahydrofuroate at 40°C in methyl tert-butyl ether, with a substrate/acyl donor molar ratio of 1:2.4. The conversion rate of (R,S)-1-(4-chlorophenyl)ethylamine was 52%, with an enantiomeric excess of 99% towards the unreacted substrate in a reaction time of 22 hours. Finally, using optically pure (S)-1-(4-chlorophenyl)ethylamine as the raw material, the chemical synthesis of (S)-N-(1-(4-chlorphenyl)ethyl)-2-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-ylthio)acetamide, a novel triazolopyrimidine herbicide, was achieved, and the total yield and purity were 83.5% and 95.3%, respectively.
研究领域:
生物化学
·
有机合成
·
酶工程
✓ 已验证
DOI
PubMed
高影响因子
Microbial Cell Factories
·
2024
·Vol. 23
·期 1
·1-16
·
IF 4.3
Wang Yifan,Shu Dan,Li Zhemin,Luo Di,Yang Jie,Chen Dongbo,Li Tianfu,Hou Xiaonan,Yang Qi,Tan Hong
Background Currently, industrial fermentation of Botrytis cinerea is a significant source of abscisic acid (ABA). The crucial role of ABA in plants and its wide range of applications in agricultural production have resulted in the constant discovery of new derivatives and analogues. While modifying the ABA synthesis pathway of existing strains to produce ABA derivatives is a viable option, it is hindered by the limited synthesis capacity of these strains, which hinders further development and application. Results In this study, we knocked out the bcaba4 gene of B. cinerea TB-31 to obtain the 1′,4′- trans -ABA-diol producing strain ZX2. We then studied the fermentation broth of the batch-fed fermentation of the ZX2 strain using metabolomic analysis. The results showed significant accumulation of 3-hydroxy-3-methylglutaric acid, mevalonic acid, and mevalonolactone during the fermentation process, indicating potential rate-limiting steps in the 1′,4′- trans -ABA-diol synthesis pathway. This may be hindering the flow of the synthetic pathway. Additionally, analysis of the transcript levels of terpene synthesis pathway genes in this strain revealed a correlation between the bchmgr , bcerg12 , and bcaba1-3 genes and 1′,4′- trans -ABA-diol synthesis. To further increase the yield of 1′,4′- trans -ABA-diol, we constructed a pCBg418 plasmid suitable for the Agrobacterium tumefaciens -mediated transformation (ATMT) system and transformed it to obtain a single-gene overexpression strain. We found that overexpression of bchmgr , bcerg12 , bcaba1 , bcaba2 , and bcaba3 genes increased the yield of 1′,4′- trans -ABA-diol. The highest yielding ZX2 A3 strain was eventually screened, which produced a 1′,4′- trans -ABA-diol concentration of 7.96 mg/g DCW (54.4 mg/L) in 144 h of shake flask fermentation. This represents a 2.1-fold increase compared to the ZX2 strain. Conclusions We utilized metabolic engineering techniques to alter the ABA-synthesizing strain B. cinerea , resulting in the creation of the mutant strain ZX2, which has the ability to produce 1′,4′- trans -ABA-diol. By overexpressing the crucial genes involved in the 1′,4′- trans -ABA-diol synthesis pathway in ZX2, we observed a substantial increase in the production of 1′,4′- trans -ABA-diol.
研究领域:
生物技术
·
微生物学
·
代谢工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yan Chen,Shao-Chun Wu,Jiao-Jiao Han,Xi Yan,Xiao-Jing Guo,Wan-Zhong Lang
Catalytic Pd decorated graphene oxide (Pd/GO) membrane with efficient catalytic activity was developed by in-situ reduction of Pd 2+ on GO nanosheets followed by vacuum filtration. A high 4-nitrophenol (4-NP) reduction efficiency was achieved by using the Pd/GO catalytic membrane with layered structure because of evenly distribution of Pd nanoparticles (NPs) in the interlayer space of GO membrane, ensuring sufficient contact between 4-NP molecules and Pd NPs. The apparent kinetic rate constant and turnover frequency (TOF) reached to 138.4 s −1 and 813 h −1 under a continuous-flow system using 4000 mg/L of 4-NP at 20 °C. During a 300 min of continuous-flow catalysis, the 4-NP conversion was kept above 98% at 20 °C. This high catalytic efficiency of the Pd/GO catalytic membrane under high 4-NP concentration and continuous-flow catalysis made it promising and competitive in the application of catalytic membrane for efficient catalytic process.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 25
·11380-11389
·
IF 3.591
Rui Yang,Yifei Liu,Zhen Dong,Haiyan Li,Zhiwen Ye
As an environmentally friendly energetic group, the azide group can not only control the melting point but also increase the energy of the compound. Therefore, the design and synthesis of energetic compounds with azido groups have long been a focus of research in the field of energetic materials. 3-R-4-(5-methyleneazide-1,2,4-oxadiazol-3-yl)furazan energetic materials were synthesized and fully characterized. Using computational chemistry methods, the interactions of some compounds were studied, and the physical and chemical properties of all of compounds were examined. The results show that 3-amino-4-(5-methyleneazide-1,2,4-oxadiazol-3-yl)furazan (2) has a melting point similar to that of TNT and can be a potential carrier for molten-cast explosives. Hydroxylamine salt (4) has an excellent detonation velocity and detonation pressure of 9090 m s−1 and 35.76 GPa, respectively, and its energy is significantly higher than that of RDX, enabling replacement of RDX as a high-energy explosive. Although the detonation performance of compound 4 is slightly lower than that of HMX, its sensitivity is better than that of HMX, which shows that compound 4 still has a high application value. Non-covalent interactions (NCIs) and Hirshfeld surface models indicate that hydrogen bonding and π–π interactions are the key factors that reduce the sensitivity of compounds. Therefore, our results for 3-R-4-(5-methyleneazide-1,2,4-oxadiazol-3-yl)furazan energetic materials suggest that it may be competitive for application in both molten-cast explosives and high-energy explosives.
研究领域:
化学
·
材料科学
·
爆炸物研究
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）