APPLIED CATALYSIS A-GENERAL
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2022
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IF 5.723
Yan Li,Mengna Ding,Guoxiang Yang,Lei Wang,Liulin Luo,Yingchun Miao,Yuning Huo
Acinetobacter baumannii ( A. baumannii ) was widely existed in medical wastewater and easily induced infections to threaten the human healthy. We herein reported Ag/CoO-N photocatalyst composites for effective inactivation of A. baumannii . Ag/CoO-N composites were prepared by N-doping to CoO crystal in supercritical fluid followed with photo-reduction of Ag under visible-light irradiation. N-species was incorporated in the crystal structure of CoO, on which uniform Ag nanoparticles were stably deposited. Thus, the satisfactory photocatalytic sterilization of A. baumannii irradiated by visible-light irradiation was attributed to the high capability of light trapping and the efficient separation of photo-charges. Due to photo-induced electrons as the main active species, Ag nanoparticles and CoO-N synergistically realized mineralization of cell membrane, which lead K + ions leak from cell to crack structure of bacteria, the decrease of genetic materials, and the cripple of the self-repair function in bacteria, resulting in the final cell death.
研究领域:
微生物学
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材料科学
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医学
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2020
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IF 3.905
Mudassir Hussain Tahir,Xingxing Cheng,Rana Muhammad Irfan,Rizwan Ashraf,Yiteng Zhang
The present study proposed successfully TG-FTIR as a novel technique for high quality bio oil production having desirable concentration of targeted products especially phenols and acids. TG-FTIR analysis of pine waste was performed to calculate yield of desirable chemical compounds at different temperature ranged 350−600 °C. While, bio oil was produced at each corresponded temperatures and GC–MS analysis was carried out to support TG-FTIR analysis which showed high consistency. Additionally, efficient extraction of phenolic compounds was performed via complex method using Ca 2+ as a complex agent under alkaline conditions which showed that 95 % phenols were extracted successfully. Meanwhile, production of calcium acetate in residue bio oil turns this study highly valuable for future scientific research.
研究领域:
生物质能
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2020
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IF 7.539
Zhe Dou,Guochao Xu,Ye Ni
A novel carboxylesterase Ac Est1 was identified from Acinetobacter sp. JNU9335 with high efficiency in the biosynthesis of chiral precursor of Edoxaban through kinetic resolution of methyl 3-cyclohexene-1-carboxylate (CHCM). Sequence analysis revealed Ac Est1 belongs to family IV of esterolytic enzymes and exhibits <40% identities with known carboxylesterases. The optimum pH and temperature of recombinant Ac Est1 are 8.0 and 40 °C. Substrate spectrum analysis indicated that Ac Est1 prefers substrates with short acyl and alcohol groups. Ac Est1 was highly active in the hydrolysis of CHCM with k cat of 1153 s −1 and displayed high substrate tolerance. As much as 2.0 M (280 g·L −1 ) CHCM could be enantioselectively hydrolyzed into ( S )-CHCM by merely 0.08 g·L −1 Ac Est1 with ee s of >99% ( S ) and substrate to catalyst ratio (S/C) of 3500 g·g −1 . These results indicate that the novel Ac Est1 is a promising biocatalyst in the synthesis of chiral carboxylic acids.
研究领域:
生物催化
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酶学
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药物化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Sikai Tang,Yuze Wang
Microbial-induced calcium carbonate precipitation (MICP), with its hydrophilic rough microstructures and as an environmentally friendly material modification method, has shown great potential for oil-water separation. However, its efficiency in separating oil-in-water emulsions remains challenging. This study advances the MICP method by producing microbially induced nanoscale calcium carbonate on a mesh using calcium acetate instead of traditional calcium chloride, successfully achieving efficient separation of oil-in-water emulsions. The stainless-steel mesh (SSM) after calcium acetate-MICP treatment obtained nano-elliptical flake-like vaterite (vaterite-SSM) and demonstrated superior superhydrophilicity and underwater superoleophobicity compared to the mesh coated with micro-cubic structured calcite (calcite-SSM) treated by calcium chloride-MICP. Notably, vaterite-SSM achieved a flux of up to 309 L·m −2 ·h −1 and an oil rejection rate of over 98.7 % in gravity-driven separation of oil-in-water emulsions, demonstrating significant reusability after 6 cycles. Conversely, calcite-SSM was ineffective in emulsion separation due to coating instability and large particle spacing. Additionally, vaterite-SSM effectively separated various oil-water mixtures, maintaining high performance across 30 separation cycles. This study underscores the important use of calcium acetate in MICP to obtain nano-elliptical flake-like vaterite for efficient oil-water emulsion separation, advancing the promise of MICP as an effective and sustainable method for environmental applications.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Hong Yin,Ruya Chen,Haibo Wang,Cory Schwarz,Haotian Hu,Baoyou Shi,Yili Wang
The adverse health effects of phthalate esters (PAEs) and perfluoroalkyl substances (PFAS) in drinking water have attracted considerable attention. Our study investigated the effects of PAEs and PFAS on the bacterial community and the growth of potential human pathogenic bacteria in rural drinking water distribution systems. Our results showed that the total concentration of PAEs and PFAS ranged from 1.02 × 10 2 to 1.65 × 10 4 ng/L, from 4.40 to 1.84 × 10 2 ng/L in rural drinking water of China, respectively. PAEs concentration gradually increased and PFAS slowly decreased along the pipeline distribution, compared to concentrations in the effluents of rural drinking water treatment plants. The co-occurrence of higher concentrations of PAEs and PFAS changed the structure and function of the bacterial communities found within these environments. The bacterial community enhanced their ability to respond to fluctuating environmental conditions through up-regulation of functional genes related to extracellular signaling and interaction, as well as genes related to replication and repair. Under these conditions, co-occurrence of PAEs and PFAS promoted the growth of potential human pathogenic bacteria (HPB), therefore increasing the risk of the development of associated diseases among exposed persons. The main HPB observed in this study included Burkholderia mallei , Mycobacterium tuberculosis , Klebsiella pneumoniae , Acinetobacter calcoaceticus , Escherichia coli, and Pseudomonas aeruginosa . Contaminants including particles, microorganisms, PAEs and PFAS were found to be released from corrosion scales and deposits of pipes and taps, resulting in the increase of the cytotoxicity and microbial risk of rural tap water. These results are important to efforts to improve the safety of rural drinking water.
研究领域:
环境科学
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微生物学
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公共卫生
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水质
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）