JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Dongliang Wang,Jingping Hu,Bingchuan Liu,Huijie Hou,Jiakuan Yang,Yuxiao Li,Yi Zhu,Sha liang,Keke Xiao
The electrogeneration of H 2 O 2 and electro-regeneration of ferrous are conflicting matters in electro-Fenton system. In this research, the degradation of Rhodamine B, methyl orange (MO) and 4-chlorophenol (4-CP) was investigated using a novel dual-cathode microbial fuel cell (MFC) electro-Fenton (EF) hybrid system. An air-cathode of an EF system was used for H 2 O 2 electrogeneration and a carbon felt cathode of a MFC was used to accelerate Fe 2+ regeneration. Synergistic improvement of MFC power generation and the degradation of the above refractory organics through EF reaction was achieved. The EF air-cathode was fabricated by adopting activated carbon/graphite powder mixture and PVDF binder, which showed higher H 2 O 2 generation but slower Fe 3+ reduction rate than MFC carbon felt cathode. The Rhodamine B removal rate constant and mineralization current efficiency of the MFC coupled EF were 64% and 42% higher than that of uncoupled EF, respectively. The MFC-EF coupled system also exhibited significantly higher removal efficiency for MO and 4-CP than that of un-coupled EF system. Moreover, the power density of MFC was greatly enhanced by coupling EF due to higher Fe 3+ /Fe 2+ redox potential than oxygen reduction.
研究领域:
环境科学
·
电化学工程
✓ 已验证
DOI
PubMed
高影响因子
Food & Function
·
2021
·Vol. 12
·期 11
·4897-4908
·
IF 5.396
Jinyu Chen,Yijun Yan,Leilei Zhang,Jiayu Zheng,Jinting Guo,Ruohan Li,Jiayu Zeng
Myofibrillar protein accounting for about 60% of total muscle proteins is expected to be a promising source of bioactive peptides. The purpose of the present study was to purify antioxidant peptides from myofibrillar protein hydrolysate of chicken breast by ultrafiltration and gel filtration chromatography, and evaluate their chemical antioxidant activities and protective effects in H2O2-stressed NIH-3T3 cells. Four major peptides were identified using nano-LC-ESI-MS/MS as ITTNPYDY, IGWSPLGSL, ITTNPYDYHY, and LRVAPEEHPTL. The sequenced peptides were synthesized and exhibited remarkable radical-scavenging ability, ORAC (108.2–133.5 μM TE per mg peptide), and FRAP (75.4–92.5 mM Fe2+ per mg peptide). Structure–activity relationship indicated that the antioxidant capacity of the peptides was more related to the presence of hydrophobic and antioxidant amino acids (including Trp, Val, Ile, Leu, Ala, Pro, Gly, Asp, His, and Tyr) in the sequences as well as their molecular structures. Moreover, they protected NIH-3T3 cells against oxidative damage through inhibiting ROS generation and lipid peroxidation. Especially, the antioxidant peptides ITTNPYDY and IGWSPLGSL significantly (p < 0.05) elevated intracellular glutathione level and antioxidant enzyme activities, and suppressed apoptosis by blocking caspase-3 activation. This work highlights that the selected peptides may serve as functional food ingredients with antioxidant and cytoprotective characteristics.
研究领域:
食品科学
·
生物化学
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Lele Cui,Peipei Ding,Ming Zhou,Wenheng Jing
Electrochemical technology offers the possibility of in situ hydrogen peroxide generation whose productivity greatly depends on the cathode properties and the reactor configuration. Herein, cerium oxide modified graphite felt is prepared and used as cathode. Ceramic membrane is integrated dividing the cell to two compartments and preventing decomposition of cathode-generated H 2 O 2 at the anode. H 2 O 2 is found almost impermeable through the membrane as concentration difference <0.5 M. The double-cell reactor performs higher energy efficiency than the conventional electrolytic cell. And H 2 O 2 accumulation rate has been enhanced in the double-cell in comparison with the undivided one, no matter using either bared or modified cathode. Operation parameters including flow rate of O 2 ( F O 2 ), flow rate of electrolyte solution (F solution ), applied current (I) and pH were optimized. Accumulated concentration of H 2 O 2 on the modified cathode reached 260.7 mg/L with the current efficiency up to 75.7% (working conditions C Na 2 SO 4 = 0.05 M, pH = 2, I = 50 mA, F O 2 = 0.2 L/min and F solution = 800 μL/min). The yield was 3.8 times higher than using the unmodified cathode. Energy consumption was reduced to 4.8 kWh/kg in the double-cell system (22.1 kWh/kg in the single-cell). In a conclusion, the double-compartment flow reactor is an improved configuration for energy effectiveness and increased productivity of H 2 O 2 for E-Fenton process.
研究领域:
环境工程
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电化学工程
·
材料科学
·
能源技术
·
水处理技术
·
反应器设计
·
催化材料
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2024
·Vol. 14
·期 4
·990-998
·
IF 4.4
Huichao He,Jinyu Wen,Qiwen Chen,Hai Yu,Kun Liu,Tao Han,Xiaoyan Liu,Gaili Ke,Yutong Li,Huaming Yang
The catalytic activation of HCO3−/H2O2 to generate reactive oxygen species could treat neutral or weak alkaline organic wastewater effectively. Based on the activation principle of HCO3−/H2O2 and the advantages of natural tourmaline, four types of common tourmaline powders were investigated as catalysts to activate HCO3−/H2O2 for the degradation of typical anionic (methyl orange: MO) and cationic (methylene blue: MB; rhodamine B: RhB) dyes in aqueous solution. Compared to magnesium-rich tourmaline, lithium-rich tourmaline and low Fe content tourmaline, higher activity was observed for high Fe content tourmaline (high-Fe TM) in the catalytic activation of HCO3−/H2O2 to achieve dye degradation. Furthermore, high-Fe TM exhibited acceptable stability for activating HCO3−/H2O2 for the degradation of dyes, and the co-existing ions in municipal tap water, temperature and pH had a weak influence on the catalytic activity of high-Fe TM. The degradation of dyes in the high-Fe TM/HCO3−/H2O2 system was found to be initiated by typical reactive oxygen species, which are mainly originated from the catalytic activation of HCO3−/H2O2 with high-Fe TM. Specifically, the Fe-based sites of high-Fe TM and the Fe ions dissolved with high-Fe TM co-activated HCO3−/H2O2 through heterogeneous and homogeneous catalysis, respectively. The degradation of RhB was driven by ˙OH and ˙O2−, and the degradation of MB and MO was initiated by 1O2.
研究领域:
环境化学
·
催化科学
·
水处理技术
·
材料科学
·
污染控制
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yijun Chen,Meina Cheng,Yundong Wang,Long Jin,Juanhong Li,Hailiang Yang,Sanjian Ma,Guoliang Dai,Zixia Lin,Xin Liu
Both the iron sludge and usage of H 2 O 2 restrict the promotion of the Fenton reaction. Herein, we proposed a hydrogen-accelerated oxygen reduction Fenton reaction system named MHORF-UiO-66(Zr) to try to solve the two problems under normal temperature and pressure. The active hydrogen, which is derived from H 2 catalyzed by the composite of Pd/UiO-66(Zr), could accelerate the reduction of Fe(III) and promote the electron transfer of two-electron oxygen reduction reaction to realize the self-generation of H 2 O 2 . And 45.9 mM of H 2 O 2 could be detected. As expected, 91 % of trimethoprim (TMP) could be degraded within 30 min in this system in the condition of 25 μM Fe(II), H 2 30 mL·min −1 , and Pd/UiO-66(Zr) 2g·L −1 , which was 2.94 times that of the control Fenton system. Based on these results, the feasibility of fundamentally achieving zero emission of iron sludge was successfully verified. It was confirmed that both the hydroxyl radical and singlet oxygen played the dominant roles during the reaction process through the analysis of electron spin resonance spectroscopy. After six reaction cycles, the removal efficiency of TMP could be maintained at least 94 %. It found that both the properties and morphology of this composite could remain based on the systematic characterization.
研究领域:
环境科学
·
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
ELECTROANALYSIS
·
2018
·Vol. 30
·期 6
·1047-1053
·
IF 2.851
Shuai Li,Yang Tian
The serious damage of ischemia to brain function has attracted extensive attention. As two of vital signal molecules, development of biosensors for monitoring of hydrogen peroxide (H 2 O 2 ) and pH in vivo is significant to understand the roles of H 2 O 2 and pH playing in rat brain followed by ischemia. Herein, a selective and accuracy ratiometric electrochemical biosensor was developed for quantifying H 2 O 2 and pH through both current and potential outputs in a rat brain upon ischemia. Catalase (Cat) was first employed as a specific recognition element for both H 2 O 2 and pH. Meanwhile, an inner reference molecule, ferrocene (Fc), independent of H 2 O 2 and pH, was used as a built-in correction to improve the accuracy. The reduction peak current of Cat increased with increasing concentration of H 2 O 2 from 1.0 to 230 μM. Meanwhile, the peak potential negatively shifted with increasing pH from 5.91 to 7.81, resulting in determination of H 2 O 2 and pH. Thus, combined with the remarkable analytical performance of the developed biosensor and the desirable biocompatibility of carbon fibre microelectrode (CFME), a direct and reliable approach was established to monitoring H 2 O 2 and pH in the microdialysates collected from rat brain followed by cerebral ischemia.
研究领域:
电分析化学
·
神经化学
·
生物传感器
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2011
·
IF 2.243
Shichao Xu,Wenwen Liu,Bingcheng Hu,Wei Cao,Zuliang Liu
A novel, sensitive and high selective flow-injection chemiluminescence (FI-CL) method for the determination of phenol is reported, based upon its decreasing effect on the CL reaction of luminol with hydrogen peroxide catalyzed by manganese (III) deuteroporphyrin [MnDP, Scheme 1 , 3 ] in alkaline solution. Under the selected optimized experimental conditions, the relative CL intensity was linear with phenol in the range of 4.0 × 10 −9 to 4.0 × 10 −7 g mL −1 . The detection limit (3 σ ) was 6.3 × 10 −10 g mL −1 and the relative standard deviation for 1.0 × 10 −7 g mL −1 phenol ( n = 11) was 2.99%. The regression equation was I = 120.79 + 1.14 × 1010 c ( R = 0.9936). This method has been applied to the determination of phenol in water with satisfactory results.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Bioresources and Bioprocessing
·
2021
·Vol. 8
·期 1
·1-9
·
IF 4.578
Ma Jun,Zeng Xiankun,Zhou Min,Cheng Le,Ren Difeng
Spirulina platensis protein hydrolysates were prepared by digesting protein extracts with papain, and the hydrolysates were separated into 30, 10, and 3 kDa weights using membrane ultrafiltration. The 0–3 kDa low-molecular-weight Spirulina peptides (LMWSPs) proved the highest chemical antioxidant activity by 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging ability, hydroxyl radical (·OH) scavenging activities and total antioxidant capacity. Cellular antioxidant ability of LMWPs fractions against 2000 μg/mL H2O2 induced oxidative damage of L02 cells were investigated. The MTT assay results displayed that LMWSPs at different concentrations (0–1000 μg/mL) had proliferation effect on the L02 cells and that treatment of the L02 cells with the 1000 μg/mL LMWSPs (0–3 kDa) significantly prevented H2O2-induced oxidative damage compared with control cells. Moreover, the 2′,7′-dichlorofluorescein diacetate (DCFH-DA) fluorescent probe assay showed that the levels of ROS and NO were significantly lower in the experimental group that was treated with the peptides for 24 h than in the control group. Furthermore, using the corresponding kits, the treatment inhibited the reduction of SOD activity and the increase of MDA contents in the L02 cells. Therefore, LMWSPs (0–3 kDa) may have potential applications in antioxidant and liver health products.
研究领域:
营养学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Yi Wang,Mi Yi,Kun Wang,Shuqin Song
Hydrogen peroxide (H 2 O 2 ) is a very useful chemical reagent, but the current industrial methods for its production suffer from serious energy consumption problems. Using high-activity and high-selectivity catalysts to electrocatalyze the oxygen reduction reaction (ORR) through a two-electron (2e − ) pathway is a very promising route to produce H 2 O 2 . In this work, we obtained partially oxidized multi-walled carbon nanotubes (MWCNTs) with controlled structure and composition by oxidation with concentrated sulfate and potassium permanganate at 40°C for 1 h (O-CNTs-40-1). The outer layers of O-CNTs-40-1 are damaged with defects and oxygen-containing functional groups, while the inner layers are maintained intact. The optimized structure and composition of the partially oxidized MWCNTs ensure that O-CNTs-40-1 possesses both a sufficient number of catalytic sites and good conductivity. The results of rotating ring disk electrode measurements reveal that, among all oxidized MWCNTs, O-CNTs-40-1 shows the greatest improvement in hydrogen peroxide selectivity (from ∼ 30% to ∼ 50%) and electron transfer number (from ∼ 3.4 to ∼ 3.0) compared to those of the raw MWCNTs. The results of electrochemical impedance spectroscopy measurements indicate that both the charge-transfer and intrinsic resistances of O-CNTs-40-1 are lower than those of the raw MWCNTs and of the other oxidized MWCNTs. Finally, direct tests of the H 2 O 2 production confirm the greatly improved catalytic activity of O-CNTs-40-1 relative to that of the raw MWCNTs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 8
·1596
·
IF 3.06
Yi Ma,Yunhui Feng,Wanling Zeng,Huibo Luo
This study aimed to investigate the antioxidant activity and release behavior of anthocyanin (ANC) loaded within FA-g-MD wall (ANC-FA-g-MD microcapsule) in vitro. The microencapsulation of ANC was prepared by spray drying and displayed a biphasic release profile. The combination of ANC and FA-g-MD (0.0625–1 mg/mL) showed a higher antioxidant activity than that of both individuals. A possible intermolecular interaction between ANC and FA-g-MD was studied by UV-vis spectra. Intracellular reactive oxygen species (ROS), 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide (MTT) test, and protein expression of quinone oxidoreductase 1(NQO1), glutathione reductase (GSR) and γ-glutamate cysteine ligase catalytic subunit (γ-GCLC) were measured through human colon cancer cells (HT-29). After a 24-hour incubation of the HT-29, the combinations (0–60 μg/mL) exhibited a high potential to diminish the ROS level. And the distinct upregulated expressions of GCLC and NQO1 of HT-29 were detected after treatment with combinations compared to those of single ones. These results suggested that the ANC-FA-g-MD microcapsules exerts enhanced antioxidant effect with capability of the modulation of GCLC and NQO1.Keywords:antioxidant;oxidative stress;anthocyanin;HT-29
研究领域:
食品科学
·
药理学
·
营养学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 19
·4432
·
IF 3.267
Quan Pan,Yuelin Kong,Kuan Chen,Mi Mao,Xiaohui Wan,Xiaoyan She,Qingsong Gao,Yu He,Gongwu Song
In this work, we report the synthesis of Cu-Ag bimetallic nanopartiles and g-C3N4nanosheets decorated on zeolitic imidazolate framework-8 (ZIF-8) to form a Cu-Ag/g-C3N4/ZIF hybrid. The hybrid was synthesized and characterized by Transmission electron microscopy (TEM), Fourier transformed infrared (FTIR), the X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The Cu-Ag/g-C3N4/ZIF hybrid has intrinsic peroxidaselike catalytic activity towards the oxidation of TMB in the presence of H2O2. The situ synthesis of Cu-Ag bimetallic nanopartiles on 2D support such as g-C3N4nanosheets would significantly enhance the peroxidaselike catalytic properties of individual Cu-Ag bimetallic nanopartiles and the g-C3N4nanosheets. After loading of Cu-Ag bimetallic nanopartiles and g-C3N4nanosheets on the ZIF-8, the hybrids exhibited superior peroxidaselike catalytic activity and good recyclability. Then, this method was applied for detecting glucose in human serum, owing the significant potential for detection of metabolites with H2O2-generation reactions.Keywords:Cu-Ag/g-C3N4/ZIF hybrid;nanozyme;colorimetric detection;H2O2;glucose
研究领域:
生物化学
·
纳米医学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Fengmin Qiao,Jiaomei Wang,Shiyun Ai,Lifang Li
Selenium has been successfully doped into graphite phase carbon nitride (g-C 3 N 4 ) by a simple thermal condensation method through calcinating the mixture of dicyandiamide, cyanuric acid and selenium dioxide. The morphology and composition of thus-prepared selenium doped graphite phase carbon nitride (Se-g-C 3 N 4 ) nanosheets were characterized by transmission electron microscopy (TEM), high resolution TEM, X-ray diffraction (XRD), fourier transform infrared (FT-IR) spectra and X-ray photoelectron spectroscopy (XPS). Characterization results revealed that the resultant products have typical ultrathin lamellar structure with the uniform lateral diameter of 20 nm. The amount of Se dopant is ca. 2.1 at% based on the XPS result. For the first time, ultrathin Se-g-C 3 N 4 nanosheets have been demonstrated to possess an intrinsic peroxidase activity by following the Michaelis–Menten kinetics and even have higher affinity to peroxidase substrates TMB and H 2 O 2 in comparison to that of HRP. Se-g-C 3 N 4 nanosheets is conducive to mediating electron transfer and thus to enhancing the catalytic oxidation of the substrate TMB in the presence of H 2 O 2 to produce a blue color change in aqueous solution. More importantly, a sensitive and selective method for xanthine detection was developed using xanthine oxidase and the as-prepared Se-g-C 3 N 4 nanosheets. On the basis of the high catalytic activity of Se-g-C 3 N 4 nanosheets, a rapid, sensitive, and convenient approach was developed for colorimetric detection of xanthine with detection limit 1.6 × 10 −8 mol L −1 . Taking the advantages of this, the novel Se-g-C 3 N 4 nanosheets represent a promising candidate as an enzyme mimic and may find a wide range of new applications in diagnostics and biotechnology fields.
研究领域:
生物化学
·
材料科学
·
诊断学
✓ 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）