Reaction Kinetics Mechanisms and Catalysis
·
2024
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IF 1.7
Lin Guangqiang,Mao Chunfeng,Li Menghua,Wang Ziyi,Li Qinyi,Zhan Jiaqing,Liu Junsheng
In this study, Zn–W–Bi–O catalysts with a sandwich structure were prepared by mixing zinc tungstate and bismuth nitrate to form bismuth tungstate at the interface. The catalyst was composed of bismuth nitrate as the upper layer, zinc tungstate as the lower layer, and phase interface (bismuth tungstate) as the core. The generation of phase interfaces provides a new reaction mechanism for catalytic processes. Based on the different intermediate state changes in the reaction process, the Zn–W–Bi–O catalysis system can be divided into H-S Mechanism, B-R Mechanism, and P-G Mechanism. These reaction mechanisms will simultaneously react with H 2 O 2 to generate various transition states, which will cooperatively oxidize sulfur atoms to remove them. The structural characteristics and stability of Zn–W–Bi–O catalysts were determined. There are strong stability and catalytic efficiency for Zn–W–Bi–O catalysts. The desulfurization rate can be close to 100% under optimal conditions (Catalyst of 0.02 g, ionic liquids of 0.5 mL, H 2 O 2 of 0.2 mL, model oil of 5 mL, 80 °C). Zn-W-Bi-O-2 catalysts lead to 3 times improvement in ODS activity for the upper layer and 1.25 times improvement in ODS activity for the lower layer. The catalytic reaction mechanism was obtained by the structure-activity relationship.
研究领域:
化学工程
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催化材料
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能源化学
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产品关联
DOI
高影响因子
TALANTA
·
2016
·
IF 4.035
Yijuan Long,Xiliang Wang,Dongjun Shen,Huzhi Zheng
It was found that reduced state carbon dots (r-CDs) possessed intrinsic peroxidase-like activity, and could catalytically oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 to produce a color reaction. The effects of temperature, pH, incubating time and the concentration of H 2 O 2 and TMB on catalytic activity of r-CDs were investigated. Finally we calculated the kinetic constant was ca. 0.00729 min −1 and applied r-CDs to glucose sensing by coupling glucose oxidase . As low as 2 µM H 2 O 2 could be detected with a linear range from 0.010 to 0.40 mM via this method. This study offered a simple, sensitive, and high selectivity method for glucose determination even in serum.
研究领域:
生物化学
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医学诊断
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DOI
PubMed
高影响因子
POLYMER INTERNATIONAL
·
2016
·Vol. 66
·期 5
·712-718
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IF 2.414
Lin Liu,Yueting Pei,Chaoliang He,Li Chen
Multi-responsive hydrogels have recently received considerable attention for bioapplications. Here, novel temperature- and redox-responsive polypetide hydrogels have been developed. Thermo-sensitive hydrogels based on poly(ethyleneglycol)- block -poly(γ-propargyl- l -glutamate) (PEG-PPLG) were first synthesized by the ring opening polymerization of γ-propargyl- l -glutamate N -carboxyanhydride (PLG-NCA) with amino group terminated PEG monomethyl ether (mPEG-NH 2 ) as macroinitiator and were then functionalized via the ‘thiol-yne’ click reaction between the propargyl pendents and the thiol-containing 1-propanethiol. The sol − gel phase transition of the obtained copolymer aqueous solution in response to temperature change was studied. The mass loss of the hydrogel in vitro was accelerated in the presence of H 2 O 2 , exhibiting a redox-responsive property. Further, the methyl thiazolyl tetrazolium viability results revealed that this polypetide hydrogel has excellent biocompatibility, presenting potential applications in the biomedical field. © 2016 Society of Chemical Industry
研究领域:
材料科学
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生物医学工程
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化学工程
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产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2013
·
IF 5.437
Ruimin Li,Mingming Zhen,Mirong Guan,Daiqin Chen,Guoqiang Zhang,Jiechao Ge,Ping Gong,Chunru Wang,Chunying Shu
C 60 -carboxyfullerene, C 60 [C(COOH) 2 ] 2 , has been proven to function as peroxidase mimetics that can catalyze the reaction of peroxidase substrate 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of H 2 O 2 to produce a blue color reaction. Kinetic studies further indicate that C 60 [C(COOH) 2 ] 2 has an even higher affinity to TMB than that of the natural enzyme , horseradish peroxidase (HRP). C 60 [C(COOH) 2 ] 2 /glucose oxidase (GO x )/TMB system provides a novel colorimetric sensor for glucose and shows good response toward glucose detection over a range of 1.0–40 μM with a limit of detection 0.5 μM (3 σ /slope). Moreover, this sensitive and selective sensor can be successfully applied for the quantitative determination of glucose in human serum. The results indicate that it is a simple, cheap, convenient, highly selective, sensitive, and easy handling colorimetric assay .
研究领域:
生物化学
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医学检测
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纳米材料
✓ 已验证
DOI
高影响因子
Materials Advances
·
2024
·
IF 5.2
Catherine Afriyie,Xingwang Zhang
Photocatalytic methane conversion is a sustainable approach to transform methane under mild conditions into its value-added derivatives for the petrochemical industry. However, obtaining high productivity and selectivity of desired products still remains a great challenge. In this work, high-efficiency Fe-doped two-dimensional BiVO4 nanosheets have been synthesized and evaluated for photocatalytic methane conversion with H2O, O2 or H2O2 as the oxidizer. The Fe-doped and undoped samples were obtained by hydrothermal synthesis using 3-dodecylbenzenesulfonate (SDBS) as the morphology-directing agent, and examined by XRD, SEM, EDS, TEM, XPS, UV-DRS and BET characterization techniques. The replacement of some Bi3+ with Fe3+ was a successful approach to enhance the photoexcitation process and the adsorption properties of BiVO4, resulting in an improvement in the yield of methyl oxygenates. Complete selectivity of methyl oxygenates (CH3OH and CH3OOH) was achieved, and the yield reached 217.6 μmol gcat−1 h−1 in 2 h under visible light irradiation under mild conditions over 1.0 wt% Fe-doped BiVO4 nanosheets in the presence of H2O2, outperforming most reported studies on this reaction. This work provides new insight into the choice of a suitable oxidizer for methane conversion in the BiVO4 photocatalyst system by projecting H2O2 as the relevant oxidant.
研究领域:
材料科学
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催化化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 31
·期 1
·015502
·
IF 3.399
Jiawang Guo,Yuan Lin,Qian Wang
We developed a facile method to fabricate platinum (Pt) porous nanotubes coated with interconnected Pt dendrites using the tobacco mosaic virus (TMV) as a template. The surface-exposed arginine residues of the TMV induced the selective deposition of Pt seeds on the TMV outside surface, and poly(sodium-p-styrenesulfonate) (PSS) was chosen to stabilize the dispersity of TMV coated with Pt seeds (TMV/SPt). The limited space between the Pt seeds and their uniform distribution on the TMV exterior confined the growth of Pt dendrites, resulting in continuous dendritic platinum nanotubes (TMV/DPtNT). The synergistic effects of porous dendrites and anisotropic structures of the TMV/DPtNTs provided an increase in the active sites, the enhancement of transport efficiency and long-distance electron transfer, which greatly improved the catalytic activity. We also demonstrated that such nanotubes could be used in the detection of H2O2 with good sensitivity.
研究领域:
材料科学
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生物纳米技术
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Minji Yang,Huichao He,Hongping Zhang,Xiaohui Zhong,Faqin Dong,Gaili Ke,Yaqi Chen,Jinyan Du,Yong Zhou
High surface states induced photoelectrochemical (PEC) activity and stability issue is the major performance bottleneck for nanostructured WO 3 photoanode. Here we report that amorphous TiO 2 ( α -TiO 2 ) be used as passivator to modify the surface states of WO 3 nanoflakes film for improving its PEC water oxidation performance. In comparison with bare WO 3 film, the α -TiO 2 -coupled WO 3 ( α -TiO 2 /WO 3 ) film is of higher PEC water oxidation activity and stability. The photocurrent on α -TiO 2 /WO 3 film photoanode is improved by 2 times that reached 1.4 mA/cm 2 in 0.1 M Na 2 SO 4 solution at 0.8 V ( vs. SCE). After α -TiO 2 coupling, the UV–vis absorption edge and intensity of WO 3 film do not change obviously, but the formation and oxidation kinetics of H 2 O 2 on WO 3 photoanode are modified. The density functional theory calculations indicate the monoclinic WO 3 (002) has a surface energy of 1.17 J/m 2 , whereas the α -TiO 2 /WO 3 (002) with a much lower surface energy of 0.3 J/m 2 . Additionally, the length of Ti O bond of α -TiO 2 is changed from the initial 1.929 Å to a shorter length of 1.886 Å and a longer length of 2.290 Å in α -TiO 2 /WO 3 (002) through the O 2- -W 6+ bonding effect at α -TiO 2 /WO 3 interface. Therefore, the enhanced PEC water oxidation performance on α -TiO 2 /WO 3 film can be attributed to that α -TiO 2 passivates the surface states of WO 3 nanoflakes film, and the formation of H 2 O 2 from the photoexcited-electrons/dissolved-oxygen route is depressed and the PEC oxidation of H 2 O 2 is accelerated.
研究领域:
材料科学
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能源化学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2018
·Vol. 12
·期 6
·1-10
·
IF 1.961
Mao Jie,Quan Xie,Wang Jing,Gao Cong,Chen Shuo,Yu Hongtao,Zhang Yaobin
Heterogeneous Fenton-like reaction has been extensively investigated to eliminate refractory organic contaminants in wastewater, but it usually shows low catalytic performance due to difficulty in reduction from Fe(III) to Fe(II). In this study, enhanced catalytic efficiency was obtained by employing Cu-doped BiFeO 3 as heterogeneous Fenton-like catalysts, which exhibited higher catalytic performance toward the activation of H 2 O 2 for phenol degradation than un-doped BiFeO 3 . BiFe 0.8 Cu 0.2 O 3 displayed the best performance, which yielded 91% removal of phenol (10 mg L –1 ) in 120 min. The pseudo first-order kinetic rate constant of phenol degradation in BiFe 0.8 Cu 0.2 O 3 catalyzed heterogeneous Fenton-like reaction was 5 times higher than those of traditional heterogeneous Fenton-like catalysts, such as Fe 3 O 4 and goethite. The phenol degradation efficiency could still reach 83% after 4 cycles, which implied the good stability of BiFe 0.8 Cu 0.2 O 3 . The high catalytic activity of BiFe 0.8 Cu 0.2 O 3 was attributed to the fact that the doping Cu into BiFeO 3 could promote the generation of Fe(II) in the catalyst and then facilitate the activation of H 2 O 2 to degrade the organic pollutants.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2022
·
IF 5.895
Jiaxin Li,Hengju Ge,Yang Xu,Jiahong Xie,Fujie Yan,Wei Chen
Geniposide (GEN), a main compound extracted from Gardenia jasminoides fruit, has various biological activities including anti-inflammation, cellular damage alleviation, neuroprotection, and others. However, the effect of GEN on oxidative stress in hepatic cells is yet to be investigated. Our study uncovered that GEN eliminated excess intracellular free radicals by activating the Nrf2/ARE signaling pathway in H2O2-treated hepatocytes, while the protective effect was blocked by ML385 (an inhibitor of Nrf2). Moreover, H2O2 led to upregulation of miR-27b-3p in L02 cells, which was restrained by GEN. Overexpression of miR-27b-3p greatly weakened the antioxidant capacity of GEN in hepatocytes via directly targeting the Nrf2 gene. Our findings indicated that GEN treatment recovered H2O2-induced oxidative stress via targeting miR-27b-3p and thereby enhanced the antioxidant capacity by stimulating nuclear translocation and accumulation of Nrf2. These findings suggest that inhibition of miR-27b-3p to activate the Nrf2/ARE pathway by GEN is a potential alternative for hepatic oxidative damage alleviation.
研究领域:
药理学
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细胞生物学
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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 HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jun Liao,Ling Ding,Yong Zhang,Wenkun Zhu
In this work, three kinds of biochars (PMBC-H 2 O, PMBC-PP and PMBC-HP) with excellent adsorption performance were obtained by carbonizing pig manure pre-treated with different agents. These biochars had the ordered mesoporous structures and possessed abundant active functional groups on their surface. The adsorption behaviors of the biochars towards U VI under various conditions were evaluated by batch experiment. The results showed that KMnO 4 and H 2 O 2 could enormously improve the adsorption performance of PMBC to U VI . After KMnO 4 and H 2 O 2 pretreatment , the maximum adsorption capacities of PMBC-PP (979.3 mg/g) and PMBC-HP (661.7 mg/g) were about 2.6 and 1.8 times higher than that of PMBC-H 2 O (369.9 mg/g), respectively, which was much higher than previously reported biochar-based materials. Obviously, KMnO 4 pretreatment leaded to a higher enhancement than that of H 2 O 2 . The removal mechanism of U VI on PMBC-PP was discussed in-depth. The interaction between U VI species and PMBC-PP was mainly ascribed to the abundant active sites on the surface of PMBC-PP. In a word, conversion of pig manure pre-treated with KMnO 4 into biochar not only demonstrates that PMBC-PP has great potential in the treatment of actual uranium-containing wastewater, but also provides a method for the rational utilization of pig manure to reduce the pollution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Bioscience
·
2021
·
IF 4.24
Qiang Chu,Ruoyi Jia,Chaowei Chen,Yaxuan Wang,Xin Yu,Yiru Zhang,Tao Wu,Xiaodong Zheng
Apios americana Medik leaves are rich in polyphenols and prevent glucose-induced damage in organisms. Polyphenols are a group of natural antioxidants. Therefore, a H 2 O 2 induced oxidative stress model of HepG2 cells was used to explore the protective effects of the Apios americana Medik leaves water extract (ALWE) against oxidative stress. Nine compounds were identified in ALWE using HPLC-TOF-MS including C 18 H 24 O 13 , which had not previously been reported. Fluorescence staining assays showed that the ALWE significantly decreased apoptosis, intracellular ROS generation, mitochondrial membrane potential (MMP) dissipation and mitochondrial membrane lipid peroxidation after ALWE pretreatment. Data from western blots showed that Keap1-Nrf2 and Sirt1-FoxO1 signaling pathways were involved in preventing H 2 O 2 induced oxidative stress. Transmission electron microscope and Western blot analyses indicated that autophagy contributed to the regulation of the oxidative balance. These results together indicated that ALWE is a potential antioxidant and autophagy activator, and it protects HepG2 cells against H 2 O 2 damage through activation of autophagy.
研究领域:
药理学
·
细胞生物学
·
分子生物学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Ning Sui,Fengya Liu,Ke Wang,Fengxia Xie,Lina Wang,Juanjuan Tang,Manhong Liu,William W. Yu
In this work, gold nanoparticles were synthesized, the introduction of Hg 2+ led to the formation of Au-Hg amalgam , which was found to possess an enhanced peroxidase-mimicking activity towards H 2 O 2 -mediated oxidation of 3, 3′, 5, 5′-Tetramethylbenzidine (colorless) to produce a blue product. This color reaction was exploited as a sensitive and selective method for colorimetric detection of Hg 2+ and H 2 O 2 , the linear ranges were 0.1–5 nM and 0.5–100 μ M, respectively. Furthermore, a test strip was successfully designed, it exhibited high sensitive, rapid and low cost for Hg 2+ and H 2 O 2 detection. More importantly, the colorimetric method could be successfully applied to real sample application in solution and in a test strip.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）