Catalysis Science & Technology
·
2016
·Vol. 6
·期 12
·4260-4270
·
IF 5.287
He Huang,Chuanhui Zhang,Lei Wang,Genqin Li,Liang Song,Guangci Li,Sifu Tang,Xuebing Li
A series of HZSM-5 supported MnOx catalysts with different manganese contents were prepared by an incipient impregnation method and tested for the catalytic oxidation of toluene. The catalytic results indicate that 10% MnOx/HZSM-5 exhibits the optimum catalytic activity, excellent catalytic durability in dry conditions and high regeneration capability in humid conditions. The dispersion of MnOx species on the HZSM-5 surface significantly reduces coke formation and simultaneously efficiently accelerates the oxidative decomposition of coke deposition during toluene catalytic oxidation. An obvious cooperative action is present on the MnOx/HZSM-5 catalysts for the catalytic oxidation of toluene, which is originally attributed to the excellent toluene adsorption capacity and trapping ability of HZSM-5 as well as the superior redox ability of the MnOx species. The correlation between characterizations and the catalytic results reveals that the mesoporous structure and low-temperature reducibility of MnOx are key factors responsible for the catalytic performance of toluene oxidation. Moreover, the Brønsted acid sites of the HZSM-5 zeolite, as active promoters, play a significant role in the catalytic oxidation of toluene through a comparative analysis with SiO2 and Al2O3 supported MnOx catalysts. The existence of a cooperative action between the redox ability of the MnOx species and the acidic properties of the HZSM-5 zeolite in the MnOx/HZSM-5 catalysts results in a high catalytic activity for the reaction.
研究领域:
催化化学
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环境科学
·
材料科学
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DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 9
·697
·
IF 4.3
Yuanqi Peng,Lezhu Su,Meng Liu,Chen Zeng,Bo Xiang,Zhuoyao Xie,Zijing Hu,Nan Zhou
The development of green, efficient, and stable pesticides for controlling agricultural pathogens remains a critical research focus. Elemental sulfur, although widely used for its bactericidal and insecticidal properties, suffers from aggregation, poor dispersibility, and limited contact with target organisms, restricting its effectiveness. In this study, we synthesized a novel biochar–sulfur composite by combining sustainable biochar with sulfur at low temperatures. The resulting material exhibited enhanced dispersibility and a five-fold increase in bactericidal efficacy compared to sulfur alone, as demonstrated in tests againstR. solanacearumandE. coli. Additionally, the composite maintained 80% efficacy after five cycles of use, highlighting its favorable cyclic performance. Mechanistic studies revealed that biochar accelerates sulfur’s redox reaction, generating free radicals that drive efficient bactericidal action. This work provides a simple and sustainable approach for developing sulfur-based antimicrobial pesticides, offering new opportunities for sulfur utilization in agriculture.
研究领域:
农业科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 12
·e202500499
·
IF 2
Tianzhu Shao,Qi Wang,Jiahao Wei,Gonggang Sun,Xinbao Li
Graphical The study focuses on the synthesis of SCR catalysts with high activity and excellent alkali resistance. The redox performance and surface acidity of VWTi are enhanced and the atomic valencies is optimized through the doping of Ce and Bi. Therefore, the catalytic activity of the catalyst is significantly enhanced and excellent catalytic activity is maintained even after KCl poisoning. Ce-doped V 2 O 5 -WO 3 /TiO 2 (CeVWTi) and its subsequent modifications have been recognized as effective catalysts for the selective catalytic reduction of NO. Herein, CeVWTi catalysts doped with varying amounts of bismuth sulfate (Bi 2 (SO 4 ) 3 ) were synthesized and evaluated for their activity and alkali resistance. These catalysts were characterized using XPS, BET, SEM, H 2 -TPR, NH 3 -TPD, and XRD techniques. The optimal doping level of Bi 2 (SO 4 ) 3 was 1 wt.%. The NO conversion rate of the catalyst co-doped with Ce and Bi was 71.6% under the reaction conditions of 300 °C, gas hour space velocity (GHSV) = 200,000 h −1 with a gas composition of 550 ppm NO, 550 ppm NH 3 , 5.6% O 2 , and N 2 as the balance. The NO conversion efficiency of the Bi 0.01 CeVWTi catalyst was maintained at 90.7% after the addition of 1 wt.% KCl poisoning under the reaction conditions of 350 °C, GHSV = 200,000 h −1 , 550 ppm NO, 550 ppm NH 3 , 5.6% O 2 , and N 2 as the balance. Characterization showed that, despite the reduction in the specific surface area of the catalyst and some acidic sites due to Bi doping, the redox performance of Bi 0.01 CeVWTi was significantly enhanced. The excellent redox performance was maintained even after KCl poisoning.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
International Heart Journal
·
2026
·Vol. 67
·期 4
·396-405
·
IF 1.4
Xingchun Mo,Ping Lu,Xiaojing Yang
Endothelial cell pyroptosis is a key factor promoting plaque instability in atherosclerosis (AS). Serum/Glucocorticoid Regulated Kinase 1 (SGK1) is upregulated in AS, but its upstream regulatory mechanisms and role in pyroptosis remain unclear. This study aims to elucidate the mechanism of action of the GATA Binding Protein 3 (GATA3)/SGK1 axis in ox-LDL-induced endothelial cell pyroptosis.
""AS and pyroptosis"" related genes were screened using bioinformatics analysis. Transcription factor binding sites in the SGK1 promoter region were predicted using JASPAR. After establishing a pyroptosis model in ox-LDL-induced mouse aortic endothelial cells (MAECs), the effects of the GATA3/SGK1 regulatory axis on pyroptosis were detected using qRT-PCR, LDH release assays, and ELISA; the regulatory relationship was validated using the GATA3 inhibitor Pyrrothiogatain and SGK1 overexpression; and the mechanism of action of SGK1 was elucidated using a Caspase1 inhibitor (VX-765).
Bioinformatics analysis identified 65 pyroptosis-related genes that were upregulated in AS, and this study focused on SGK1. The SGK1 promoter region contains 4 GATA3 binding sites. Ox-LDL significantly upregulated GATA3, SGK1, cleaved-Caspase-1, GSDMD-N and NLRP3 expression, while pyrrothiogatain reduced SGK1 expression and alleviated cellular damage and excessive inflammation. SGK1 overexpression reversed the protective effect of Pyrrothiogatain. Mechanistic studies showed that SGK1 overexpression exacerbated ox-LDL-induced pyroptosis, while VX-765 significantly reversed this effect.
This study elucidates that GATA3 activated SGK1 transcription by directly binding to its promoter region, thereby promoting Caspase1/GSDMD-dependent endothelial cell pyroptosis.
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Yifan Han,Peng Chen,Wendong Zhang,Yaqing Chen,Menglin Li,Sihua Deng,Qi Zhou,Wensheng Fu
High entropy oxides (HEOs) have excellent light absorption performance, abundant active sites, and good photocatalytic stability, but there is currently little research on their photocatalytic activity for NOx. This work prepared (BiCoNiCuMn)Ox by a two-step solid-state grinding and high-temperature calcination method, and its photocatalytic NO removal efficiency reached 55%. However, the catalyst is significantly deactivated during the cyclic reaction process. In order to further investigate the deactivation mechanism, a series of comprehensive characterization techniques were employed in this study, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT). The research results indicate that the nitrate (NO3–) generated during the reaction process is the main factor leading to the deactivation of (BiCoNiCuMn)Ox. The accumulation of nitrate ions (NO3–) on the surface of the catalyst leads to the formation of an insulating layer, which hinders the performance of the catalyst. This study not only provides important insights into the deactivation mechanism of the (BiCoNiCuMn)Ox photocatalyst, but also establishes a theoretical framework for the practical application of high entropy oxides in environmental remediation.
研究领域:
环境科学
·
材料科学
·
光催化
·
空气污染控制
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产品关联
DOI
PubMed
高影响因子
MACROMOLECULES
·
2025
·
IF 5.2
Chen Lin,Han Hu,Hanxu Zhu,Qingyang Luan,Zhenzhong Li,Jinggang Wang,Jin Zhu
Common biodegradable polyesters are degraded under favorable conditions, such as industrial compost. Poly(butylene adipate-co-terephthalate) (PBAT) is one of the most prospective and prevalent biodegradable polymer, while its degradation in natural environment is slow. Herein, we introduce a stimulus group with disulfide bonds to obtain a poly(butylene adipate-co-dithiodipropionate-co-terephthalate) (PBADiT) copolyester. Their melting temperature is higher than 120 °C and the thermal stability is sufficient for melt processing. They show high modulus (>110 MPa) and high toughness when ≤30% of disulfide bonds are introduced. BDi (butylene dithiodipropionate) units show slightly lower hydrolysis and enzymatic degradation ability, and PBADiT copolymers show acceptable storage stability in a damp environment. The redox response of PBADiT helps realize on-demand degradation after use. From 0.01 to 1 mol/L H2O2 solutions, the hydrolysis of PBADiT can be regulated or accelerated by 15 days of fast hydrolysis with weight loss exceeding 40%. Reductive conditions, represented by 0.2 mol/L dithiothreitol (DTT) solutions, are also an efficient stimulus source for achieving rapid breakage of PBADiT. Hence, PBADiT copolymers provide a new approach for sustainable and degradable materials with required usage time and impart the polymer with accelerated degradation in redox environments.
研究领域:
材料科学
·
环境科学
·
生物化学
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产品关联
DOI
高影响因子
Energy Material Advances
·
2021
·
IF 0
Shuzhi Hu,Liwen Wang,Xianzhi Yuan,Zhipeng Xiang,Mingbao Huang,Peng Luo,Yufeng Liu,Zhiyong Fu,Zhenxing Liang
A novel electroactive organic molecule, viz., 1-(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl)-1′-(3-(trimethylammonio)propyl)-4,4′-bipyridinium trichloride ((TPABPy)Cl3), is synthesized by decorating 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) with viologen, which is used as the positive electrolyte in neutral aqueous redox flow battery (ARFB). Extensive characterizations are performed to investigate the composition/structure and the electrochemical behavior, revealing the favorable effect of introducing the cationic viologen group on the electroactive TEMPO. Salient findings are as follows. First, the redox potential is elevated from +0.745 V for TEMPO to +0.967 V for decorated TEMPO, favoring its use as the positive electrolyte. Such an elevation originates from the electron-withdrawing effect of the viologen unit, as evidenced by the nuclear magnetic resonance and single crystal structure analysis. Second, linear sweep voltammetry reveals that the diffusion coefficient is 2.97×10−6 cm2 s−1, and the rate constant of the one-electron transfer process is 7.50×10−2 cm s−1. The two values are sufficiently high as to ensure low concentration and kinetics polarization losses during the battery operation. Third, the permeability through anion-exchange membrane is as low as 1.80×10−11 cm2 s−1. It is understandable as the positive-charged viologen unit prevents the molecule from permeating through the anion exchange membrane by the Donnan effect. Fourth, the ionic nature features a decent conductivity and thus eliminates the use of additional supporting electrolyte. Finally, a flow battery is operated with 1.50 M (TPABPy)Cl3 as the positive electrolyte, which affords a high energy density of 19.0 Wh L-1 and a stable cycling performance with capacity retention of 99.98% per cycle.
研究领域:
化学
·
能源科学
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DOI
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xueyue Mi,Yi Li,Xingming Ning,Jinhu Jia,Haitao Wang,Yuguo Xia,Yan Sun,Sihui Zhan
The emergence of antibiotics in the environment, especially in drinking water, poses potential harm to human health. It’s urgent to develop effective methods to remove antibiotics in drinking water. In this work, a series of mesoporous Mn x Co 3−x O 4 nanoparticles with high surface area were successfully synthesized and firstly used as effective stable electro-Fenton catalysts to degrade ciprofloxacin (CIP). The removal of CIP achieved to 100% within 5 h. Experimental and density functional theory (DFT) studies verified the existence of redox pairs of Mn 2+ /Mn 3+ and Co 2+ /Co 3+ . Scanning electrochemical microscopy (SECM) results suggested that the redox reaction capacity of MnCo 2 O 4 was enhanced and the electron transfer rate on the surface of this bimetallic oxide was 2.67 and 1.6 times the number of MnO 2 and Co 3 O 4 , respectively. The effective degradation of CIP was mainly associated with the increased electron transfer rate and advanced redox reactivity owing to the synergistic effect of manganese and cobalt entrapped in the matrix of mesoporous structure which provided more accessible active sites. The degradation intermediates and possible process mechanism were investigated in detail. The reusability of MnCo 2 O 4 -CF cathode was evaluated five cycles with minimal ion leaching which the concentration of Mn and Co in the system was lower than 2.5 and 3.4 ppm, respectively. This work provides further understanding for removal process of organic pollutants by investigation of redox couple and electron transfer rate of the promising MnCo 2 O 4 -CF cathode.
研究领域:
环境科学
·
材料科学
·
生物学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 112
·92292-92302
·
IF 3.84
Meng Cai,Mengyuan Ye,Xingxing Shang,Honghao Sun,Mingxing Liu,Hongmei Sun,Zhuo Ma,Hongda Zhu
Polymeric micelles as nanocarrier-based drug delivery systems provide an innovative platform for selectively delivering active molecules and offer better antitumour activity. However, circulation stability in vivo, controllable drug intracellular release and high targeting efficiency are several practical challenges for micelles. Therefore, we developed cRGD-modified and shell crosslinked micelles (RSCMs) based on amphiphilic poly(styrene-co-maleic anhydride) (SMA). RSCMs exhibited a spherical shape and were homogeneous with an average diameter of 106.1 nm and a low polydispersity of 0.087. In comparison, after crosslinking the micelles possessed better stability against dilution and stronger redox-response towards dithiothreitol (DTT). The SMA micelles displayed high drug loading capacity for hydrophobic DOX with a drug loading of approximately 14.1–19.2% (w/w) and an encapsulation efficiency of 72.1–82.7% (w/w). The in vitro release studies of shell crosslinked micelles showed that DOX release was minimal (<25%, 24 h) under physiological conditions. However, in the presence of 10 mM DTT, accelerated release of DOX was achieved (60%, 24 h). MTT assays in B16F10 cells indicated that RSCMs displayed low cytotoxicity up to a concentration of 500 μg ml−1. Moreover, the IC50 value showed that cRGD-DOX-ss-M could be more effective than other groups. In vitro, cellular uptake was further studied with confocal laser scanning microscopy and flow cytometry, both the qualitative and quantitative results demonstrated that cRGD-DOX-ss-M possessed much better specificity to cancer cells and superior stimulated release property in cytoplasm. Notably, cRGD-DOX-ss-M could more efficiently be delivered to and release into the nuclei of αvβ3 integrin over expressing tumor cell line (B16F10) than counterparts of integrin-deficient tumor cells (Hela). Thus, these cRGD-modified redox-sensitive micelles have appeared as a technology platform with great potential for targeted anticancer drug delivery and release for integrin over expressing tumor cells.
研究领域:
药剂学
·
肿瘤学
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Yiqing Zeng,Fengye Lyu,Yanan Wang,Shule Zhang,Qin Zhong,Zhaoxiang Zhong
High N 2 O selectivity of MnO x -TiO 2 catalyst hinders its development in ammonia selective catalytic reduction (NH 3 -SCR) of NO x . Herein, a series of MnO x -TiO 2 catalyst with different Mn/Ti ratio were prepared by wet-impregnation method to study the N 2 O formation during ammonia selective catalytic reduction (NH 3 -SCR) of NO x from the perspective of catalyst. It is found that MnO x and TiO 2 species are the mainly redox and acid sites for the NH 3 -SCR denitration reaction over MnO x -TiO 2 catalyst, respectively. As the Mn/Ti ratio increases, MnO x species layer expanded on TiO 2 support, leading to increase of redox sites but decrease of surface acid sites. These changes contribute to the occurrence of the no-selective oxidation of NH 3 on MnO x species and the over-activation of NH 3 at Mn-Ti interface, resulting in the formation of N 2 O via the route of 2NH 3 + 2O 2 → N 2 O + 3H 2 O and 4NO + 4NH 3 + 3O 2 → 4N 2 O + 6H 2 O, respectively. Through this work, it can be speculated that both improving MnO x dispersion and increasing surface acidity of catalyst are feasible strategy for suppressing the N 2 O formation on MnO x -TiO 2 .
研究领域:
环境科学
·
催化化学
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产品关联
DOI
高影响因子
APPLIED GEOCHEMISTRY
·
2022
·
IF 3.841
Peiwen Zhang,Shaofeng Wang,Danni Zhang,Yumeng Wang,Yu Song,Yongfeng Jia
Thioarsenic species are widely existed in transitional environments with varying redox potential such as hot springs and paddy fields , where arsenite , sulfide and thioarsenites may be exposed to ambient air. However, arsenic speciation, especially the kinetics of arsenic transformation in such scenarios are not well studied. Here we present results from both kinetic experiments and computational information on the formation mechanisms of thioarsenic species from the sulfide-driven oxidation of arsenite (13.3 μM) under air atmosphere at circumneutral pH (6.5–10.5, covering the usual groundwater pH range). Ion chromatography-hydride generation atomic fluorescence spectrometry (IC-HG-AFS) was used for the determination of non-thiolated arsenic and thioarsenate species as well as indirect identification of thioarsenites at environmentally relevant As concentration. Results showed that the ambient air facilitated the thiolation and oxidation of arsenite, during which thioarsenites were served as intermediates. It was supported by our ab initio DFT calculation showing that the activity towards oxidation was in the order of: monothioarsenite > dithioarsenite > trithioarsenite > arsenite. The thiolation of arsenite was decreased with pH with a rate constant of 0.2–1.7 h −1 ; while the oxidation of thioarsenites by air was increased with pH with a rate constant of 0.1–0.45 h −1 . The results of this study shall improve our mechanistic understanding on the formation of thioarsenic, and shed light on the potential intermediate roles played by thioarsenites in environments with varying redox potential or intermittent anoxia, such as paddy fields, peatlands , hot springs etc.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2022
·
IF 13.7
Jiaqi Si,Guofeng Zhao,Tian Lan,Jiayong Ni,Weidong Sun,Ye Liu,Yong Lu
The MnOx-Na2WO4-based catalysts show the most promise for practical application in the oxidative coupling of methane (OCM), but its working mechanism is still open for debate. Herein, we attempt to reveal the role of Na2WO4 in a low-temperature light-off Mn7SiO12–Na2WO4/Cristobalite catalyst system. Three catalysts with Mn7SiO12–Na2WO4, Mn7SiO12, and Na2WO4 supported on cristobalite were rationally tailored, tested in the OCM reaction, and deeply characterized by 17O-labeling solid state nuclear magnetic resonance and Raman combined with temperature-programmed reaction/desorption methods. The OCM reaction proceeds via the Na2WO4-modulating Mn7SiO12 ↔ MnSiO3 redox with CH4/O2. The Na2WO4 substantially reduces the trigger temperature of such a redox cycle and gets it running selectively instead of combustion. Neither direct redox of Na2WO4 nor oxygen spillover between Na2WO4 and Mn7SiO12 was observed. Nevertheless, oxygen exchange between O2 and Na2WO4 will still occur via the Td-WO4 ↔ Oh-WO6 tautomerization only in case of re-oxidizing MnWO4 (Oh-WO6) formed during reaction at >750 °C back to Mn7SiO12 and Na2WO4 (Td-WO4).
研究领域:
催化化学
·
材料科学
✓ 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）