CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yang Wu,Lifeng Lin,Fidèle Suanon,Anyi Hu,Ya-Nan Sun,Zhi-Min Yu,Chang-Ping Yu,Qian Sun
The aim of this study was to quantify the removal of halogenated pollutants (using triclosan as a model pollutant) from aqueous solution by zero-valent iron coupled with a weak magnetic field. We determined the removal efficiency of triclosan from a sodium sulfate solution at different pH values under both aerobic and anaerobic conditions. The removal of triclosan followed pseudo-first-order kinetics in both the presence and absence of a weak magnetic field. The calculated rate constants indicated higher removal efficiencies of triclosan under the aerobic condition compared to the anaerobic condition. In addition, increase of triclosan removal from acidic solutions was achieved with the assistance of weak magnetic field. X-ray diffraction and X-ray photoelectron spectroscopy analysis indicated that FeO(OH) and Fe 3 O 4 were the main aerobic transformation products, suggesting that the zero-valent iron surfaces were completely oxidized. The aerobic and anaerobic transformation products of triclosan were analyzed by liquid chromatography tandem mass spectrometry. The results indicated that the application of a weak magnetic field could be an efficient and cheap treatment process to improve the removal of halogenated pollutants by zero-valent iron, which may be developed for future use.
研究领域:
环境科学
·
污染控制
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Microbiology
·
2022
·
IF 6.064
Li Xiaomei,Chen Fei,Xiong Yi,Guo Linna,Xu Jingjing,Lin Yanli,Ni Kuikui,Yang Fuyu
The aim of this study was to investigate the influence of Perilla frutescens, alone or in combination with Lactobacillus plantarum a214 or citric acid, on forage oat silage quality, bacterial and fungal microbiological profile during ensiling and aerobic exposure. With the exception of Perilla frutescens, all additives could improve silage quality of forage oat based on lower ammonia-nitrogen content and higher residual of water soluble carbohydrates during anaerobic fermentation compared to control silage, especially in Perilla frutescens combined with citric acid (CAPF). Lactobacillus was the dominant bacteria in all silages, while CAPF group increased the relative abundance of Lactobacillus lindneri and Lactobacillus brevis compared to control silage. The application of Perilla frutescens suppressed the relative abundance of yeasts such as Pichia fermentans and Wickerhamomyces anomalus in response to aerobic exposure, especially in CAPF treatment, leading to high acetic acids and lower dry matter loss, as well as good aerobic stability. Therefore, Perilla frutescens, alone or in combination with citric acid, has potential to improve aerobic stability of forage oat silage by shifting bacterial and fungal community composition, and can be used as new additive to prepare high-quality silage for animal production.
研究领域:
微生物学
·
动物营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2013
·Vol. 15
·期 8
·2215-2221
·
IF 6.828
Tianliang Lu,Zhongtian Du,Junxia Liu,Hong Ma,Jie Xu
Catalytic oxidation of non-activated aliphatic alcohols with molecular oxygen is rather challenging, especially in an aqueous medium in the absence of an additional base. Bismuth is usually used as a promoter of platinum-based catalysts. In this work, bismuth oxide was explored as a support, and Pt0 nanoparticles supported on bismuth oxide (Pt/Bi2O3) exhibited high activity for aerobic oxidation of n-butanol using water as a solvent in the absence of an additional base under optimized conditions. Besides n-butanol, liquid primary aliphatic alcohols with low solubility in water could also be smoothly oxidized into the corresponding carbonyl compounds with molecular oxygen. Pt/Bi2O3 reduced by H2 at about 200 °C showed the highest activity for aerobic oxidation of n-butanol. At this temperature, platinum oxide was reduced to Pt0 and bismuth oxide could be reduced partially which might change the surface property of bismuth oxide.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yurong Zhang,Junpeng Wang,Meiying Niu,Jun Tang,Zhipeng Chen,Chao Wan,Qingping Ke
Manganese oxides (MnO x ) have been emerged as highly active catalysts for the aerobic oxidation of biomass-derived compounds. Herein, a facile urea–redox hydrothermal method was employed to scalable synthesis of MnO x oxides with surface abundant unsaturated Mn and O species. The defective MnO x (MnO x –D) catalyst exhibits remarkable catalytic performance, enabling the room-temperature aerobic oxidation of biomass–derived alcohols with yields exceeding 99%. This represents a substantial 90.8-fold increase in activity compared to commercial MnO 2 . Moreover, MnO x –D catalyst demonstrates broad substrate scopes for various biomass–derived alcohols and displays recyclability for the aerobic oxidative conversion of 5-hydroxymethylfurfural (HMF) over five cycles. Through a comprehensive analysis involving X–ray photoelectron spectroscopy (XPS), in–situ infrared (IR) spectroscopy, and controlled experiments, it is established that the presence of surface–adsorbed H 2 O species on MnO x –D catalyst significantly influences its catalytic performance. Mechanism studies reveal that the aerobic oxidation of biomass–derived R–CH 2 –OH compounds into the corresponding aldehydes can proceed via radical and non–radical pathways. Notably, the catalytic activity of MnO x –D catalyst in both pathways is mediated by the surface adsorbed H 2 O species. In the radical route, surface adsorbed H 2 O and O 2 species are converted into active •OH radical species, while in the non–radical route, surface adsorbed H 2 O can form a complex of HMF––H 2 O species. Both processes enhance the abstraction of H from the O–H and C–H bonds in the R–CH 2 –OH compounds on MnO x –D catalyst. This discovery could potentially guide the development of efficient metal oxidic catalysts for the oxidation of biomass–derived R–CH 2 –OH compounds.
研究领域:
催化化学
·
材料科学
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
npj Precision Oncology
·
2025
·Vol. 9
·期 1
·1-13
·
IF 8
Wang Zexuan,Guo Yaoyu,Hu Kefei,He Tingjiang,Qin Tong,Zhang Ludan,Xu Fang,Xu Yuanzhi,Cheng Mingjiao,Zhang Jintao,Zhao Qianwei
Phosphoglycerate mutase 2 (PGAM2) is a crucial glycolytic enzyme. Recently, we have found that both the protein and acetylation levels of PGAM2 are down-regulated in hepatocellular carcinoma (HCC) tissues. However, the functional significance of PGAM2 in HCC progression remains poorly characterized. In this study, we demonstrated that PGAM2 functioned as a tumor suppressor in HCC progression, and knockdown of PGAM2 promoted proliferation of HCC cells and tumor growth both in vitro and in vivo. Moreover, we identified lysine 100 (K100) in PGAM2 as the predominant deacetylation site of sirtuin-2 (SIRT2), and that deacetylation of K100 destabilized PGAM2 by promoting its ubiquitination and degradation. Importantly, we discovered that PGAM2 suppressed aerobic glycolysis through an enzymatic activity-independent mechanism in HCC cells. Mechanistic investigations revealed that PGAM2 knockdown upregulated lactate dehydrogenase A (LDHA) expression via activation of the signal transducer and activator of transcription 3 (STAT3). Furthermore, we found that knockdown of PGAM2 sensitized HCC cells to sorafenib treatment. In conclusion, these findings elucidate the tumor-suppressive role of PGAM2 in HCC progression and its post-translational regulation through SIRT2-mediated deacetylation, which provide novel biomarkers and therapeutic targets for HCC treatment.
研究领域:
肿瘤学
·
分子生物学
·
代谢研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 29
·14634-14643
·
IF 11.301
Chuan-Shu He,Rong-Rong Ding,Guan-Nan Zhou,Di He,Peng Fan,Xiao-Hong Guan,Yang Mu
Surface passivation is one of the most challenging aspects in the successful application of zero-valent iron (ZVI) for water decontamination, especially when oxygen is inevitably present. This study found that the coexistence of HA ranging from 0 to 40.0 mg-C/L appreciably improved the pseudo-first-order kinetic rate constant of pollutant diatrizoate (DTA) reduction by ZVI from 0.0454 to 0.1365 h−1 under aerobic conditions. For the first time, it revealed that the coexistence of HA could accelerate the reductive removal of organic contaminants via ZVI surface depassivation rather than the previously proposed electron-shuttle mechanism under aerobic conditions. Interestingly, both DTA removal and Fe0 consumption were found to undergo two stages in the presence of HA, with an initial slight enhancement attributed to the Fe(III)–HA complex formation partially suppressing iron precipitation, followed by a remarkable promotion arising from the HA-associated iron oxide detachment from the Fe0 surface. These findings not only provide a good strategy to enhance ZVI reactivity with minimal extra cost and complexity under aerobic conditions, but also help understand the ZVI behavior in practical applications.
研究领域:
环境科学
·
污染治理
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 125
·期 2
·789-806
·
IF 1.515
Yan Huaipu,Zhang Hong-Yu,Wang Liping,Zhang Yuecheng,Zhao Jiquan
The immobilization of ruthenium species on polyethylenimine (PEI) modified magnetic nanoparticles coated with silica afford a multifunctional catalyst (Fe 3 O 4 @SiO 2 @PEI@Ru(OH) x ) for the aerobic oxidation/Knoevenagel condensation of alcohols and active methylene compounds. A wide scope of alcohols and malononitrile could be converted to their corresponding condensation products in excellent yields under mild conditions. This catalyst has advantages of leaching-free of ruthenium species and ease of recovery by an external magnet. The activity deactivation of the catalyst was investigated and was ascribed to the transformation of surface Ru 3+ to Ru 4+ in the process of aerobic oxidation of alcohols.
研究领域:
化学催化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 10
·1089
·
IF 2.935
Lili Liu,Xiaojing Zhou,Yongmei Yan,Jie Zhou,Wenping Zhang,Xishi Tai
The metal-organic zeolite imidazolate framework-8 (ZIF-8) supported gold-silver bimetallic catalysts with a core-shell structure (Au@Ag/ZIF-8 and Ag@Au/ZIF-8) and cluster structure (AuAg/ZIF-8) were successfully prepared by the deposition-redispersion method. Energy dispersive X-ray spectroscopy (EDS) elemental mapping images displayed that in the Au@Ag/ZIF-8 catalyst, Ag atoms were deposited on an exposed Au surface, and core-shell structured Au@Ag particles with highly dispersed Ag as the shell were formed. Additionally, the XPS investigation at gold 4f levels and silver 3d levels indicated that the Au and Ag particles of Au@Ag/ZIF-8, Ag@Au/ZIF-8, and AuAg/ZIF-8 were in a zero valence state. Among the resultant catalysts obtained in this study, Ag@Au/ZIF-8 catalysts showed the highest catalytic activity for the selective oxidation of benzyl alcohol, followed by AuAg/ZIF-8 and Au@Ag/ZIF-8. The turnover frequency (TOF) values were in the order of Ag@Au/ZIF-8 (28.2 h−1) > AuAg/ZIF-8 (25.0 h−1) > Au@Ag/ZIF-8 (20.0 h−1) at 130 °C within 1 h under 8 bar O2when using THF as solvent. The catalysts of Au@Ag/ZIF-8 and Ag@Au/ZIF-8 with core–shell structures have higher benzaldehyde selectivities (53.0% and 53.3%) than the AuAg/ZIF-8 catalyst (35.2%) in the selective oxidation of benzyl alcohol into benzaldehyde. The effect of the solvent, reaction temperature, reaction time, and reaction pressure on benzyl alcohol conversion and benzaldehyde selectivity in benzyl alcohol selective oxidation over Au@Ag/ZIF-8, Ag@Au/ZIF-8, and AuAg/ZIF-8 were also investigated. All of the catalysts showed excellent performance at 130 °C under 8 bar O2within 1 h when using THF as the solvent in the selective oxidation of benzyl alcohol to benzaldehyde. Moreover, the catalysts can be easily recycled and used repetitively at least four times.Keywords:metal-organic frameworks;core-shell;bimetallic catalyst;aerobic oxidation;benzyl alcohol
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Bowen Wu,Yixi Chen,Mingtai Liu,Yi Tang,Gengfeng Zheng,Linping Qian
The surface properties of CoMg/Al 2 O 3 were evaluated in the aerobic oxidation of p -cresol. The surface interaction is enhanced greatly after Co and Mg impregnation with the mole ratio of Co/Mg from 2 : 1 and 2 : 3. The strongest interaction for the nonpolarity and benzene ring was found on CoMg/Al 2 O 3 with Co/Mg of 2 : 3. But for the interaction with p -π group bonding with negative anion, the highest value appears on the catalyst with the Co/Mg of 2 : 2. In aerobic oxidation of p -cresol, the conversion is significantly increased with Co addition and reaches around 60 % after 24 h' reaction at 338 K. The highest selectivity of p -hydroxybenzaldehyde of 99 % is achieved on Al 2 O 3 with the co-impregnation mole ratio of Co/Mg of 2 : 2. It is suggested that medium adsorption of the reactants and strong stabilization of the intermediates facilitate the aerobic oxidation of p -cresol to p -hydroxybenzaldehyde.
研究领域:
催化化学
·
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
TETRAHEDRON
·
2023
·
IF 2.1
Zhiwei Wang,Rong Zhao,Jia Lin,Chaoyang Liu,Qiang Jia,Changhu Chu
A highly efficient and Tempo-free catalytic aerobic alcohol oxidation method has been developed using charcoal-supported Cu 0 nanoparticles（Cu-A） in conjunction with pyridine. Various alcohols, bearing different functional groups, can be readily oxidized to their corresponding ketones and aldehydes under mild conditions.
研究领域:
化学
·
催化
·
有机合成
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2014
·Vol. 4
·期 12
·4308-4312
·
IF 4.76
Ran Ma,Cheng-Bin Huang,An-Hua Liu,Xue-Dong Li,Liang-Nian He
An environmentally benign CO2/glycol reversible acidic system was developed for the iron(III)-catalyzed aerobic oxidative iodination of electron-rich aromatics without the need for any conventional acid additive or organic solvent. Notably, moderate to high isolated yields (up to 97%) of the aryl iodides were attained with comparable regioselectivity when ferric nitrate nonahydrate was used as the catalyst with molecular iodine under 1 MPa of CO2.
研究领域:
有机化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Yanghe Fu,Long Sun,Huan Yang,Lai Xu,Fumin Zhang,Weidong Zhu
The Ni-doped NH 2 -MIL-125(Ti) catalyst was developed for the photocatalytic aerobic oxidation of aromatic alcohols upon visible light irradiation. The results show that different aromatic alcohols can be effectively transformed to their corresponding aldehydes with almost absolute selectivity using O 2 as the oxidant over Ni-doped NH 2 -MIL-125(Ti) upon visible light irradiation. Compared with the parent catalyst NH 2 -MIL-125(Ti), Ni-doped NH 2 -MIL-125(Ti) exhibits a significantly enhanced photocatalytic activity for the selective oxidation of aromatic alcohols. Preliminary studies indicate that the doping of Ni nanoparticles into NH 2 -MIL-125(Ti) could improve the visible-light harvesting, charge-separation, and electron-transport of the resultant catalyst, leading to the enhanced photocatalytic activity. The current work provides some guidance in the development of MOF-based photocatalysts for organic syntheses.
研究领域:
材料化学
·
有机合成
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）