APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Mingji Xu,Xi Ran,Ruoli Chen,Maoshen Chen,Ruijuan Qi,Chengqin Dai,Chunhua Luo,Hui Peng,Hechun Lin
Gas sensors based on metal/metal oxide heterostructures have shown rapid advancements due to their excellent sensing performance. However, it is difficult to control the formation of Cu/CuO nanostructure due to the easy oxidation of copper and limits its sensing application. Herein, we reported the controlled oxidation of Cu superfine particles (SPs) to form Cu/CuO nanostructure via reducing CuO with monoethanolamine, oxidized with H 2 O 2 and then in-situ annealed at 250 °C. The organic residue generated during the reducing step plays a key role in controlling the oxidation of Cu SPs to form Cu/CuO nanostructure. The nanomaterial was used to fabricate gas sensor, which presents excellent p-type sensing performance to ethanol with good selectivity and a good linear relationship in the range of 1 to 100 ppm ethanol. The response to 100 ppm ethanol can be up to 99.40 under 200 °C operating temperature, and the response under 250 °C is 30.66 with the shorter response and recovery time of 214 s and 74 s, respectively. The sensing mechanism can be explained by the adsorption–desorption model. This study provides a promising strategy for the synthesis of Cu/CuO nanostructure and open a new avenue for the development of highly sensitive ethanol sensor.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yuan-yuan Ren,Cheng Liu,Yu-ye Luo,Tariq Mehmood,Yu-lin Zheng
Magnetic ion exchange resin (MIEX) pretreatment has been widely used to enhance the performance of waterworks, but the high-salinity organic desorbent produced during the resin regeneration is difficult to be safely disposed of. The present study aimed to investigate the removal of DOM and retention of salts from MIEX desorbent via zero-valent iron (ZVI)-assisted Fenton reaction . ZVI/H 2 O 2 mediated Fenton reaction was further validated by various analytical approaches such as 3D-EEM, Molecular weight distribution, Zeta potential , size, dissolution of iron ions, etc. In batch experiments, 73.26% reduction of DOC and 97.66% of UV 254 were achieved in 40 min at optimal H 2 O 2 concentration (20 mM), 2 g/L dose of ZVI, and pH of 3, respectively. The removal of organics was ascribed to the direct oxidation of ZVI/H 2 O 2 and flocculation of the iron released during the oxidation . It should be noted that the high concentration of Cl - in system favored the organic removal and its enhanced performance lied in the production and oxidation of HOCl/OCl - . The treated liquid can be reused to regenerate the saturated resin with only a small amount of salt supplementation to obtain a similar recovery performance to that of a freshly configured 10% NaCl solution. Moreover, the retrieval and utilization of ZVI particles and other properties of MIEX desorbent after ZVI/H 2 O 2 treatment were all promising and up to the mark: after four reuses, the mineralization of organic matter differs by 8.81% from the first time, which could be compensated by supplying new ZVI. This research will facilitate the recycling of resin desorbate and expand the market for MIEX applications.
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CHEMOSPHERE
·
2022
·
IF 8.943
Dongdong Liu,Dengqian Chen,Zhengkai Hao,Yibo Tang,Lipeng Jiang,Tianqi Li,Bing Tian,Cuiping Yan,Yuan Luo,Boyin Jia
In this work, a comparative study of efficient degradation of Rhodamine B (RhB) in CoFe 2 O 4 /H 2 O 2 and CoFe 2 O 4 /PMS systems was performed. Batch experiments indicated that the RhB degradation rate of CoFe 2 O 4 /H 2 O 2 system reached 95.5% at 90 min under the condition of 0.5 g L −1 of CoFe 2 O 4 dosage, 10 mM of H 2 O 2 concentration and 3.0 of initial pH. At certain conditions of initial pH = 7.0, 0.3 g L −1 of CoFe 2 O 4 dosage, 7 mM of PMS concentration, CoFe 2 O 4 /PMS system could completely degrade RhB within 90 min. EPR and quenching experiments indicated that •OH was the main active species of CoFe 2 O 4 /H 2 O 2 system, and •OH, SO 4 • - , •O 2 − and 1 O 2 participated in RhB degradation of CoFe 2 O 4 /PMS system. The circulate of Co(II)/Co(III) and Fe(II)/Fe(III) on the CoFe 2 O 4 surface promoted the formation of free radical species in the two system. In CoFe 2 O 4 /PMS system, the formed •O 2 − and SO 5 • - realized the generation of non-free radical species ( 1 O 2 ). The LC-MS results indicated that N -de-ethylation, chromophore cleavage, opening rings and mineralization were the main steps for the RhB degradation of the two systems. After five cycles of degradation experiment, the CoFe 2 O 4 /H 2 O 2 and CoFe 2 O 4 /PMS systems still maintained the high degradation rate (85.2% and 92.4%) and low mass loss (2.7% and 3.09%). In addition, CoFe 2 O 4 /PMS system had better potential value for the actual water and multi-pollutant degradation than CoFe 2 O 4 /H 2 O 2 system. Finally, the toxicity analysis and cost assessment of the two oxidation systems were preliminarily evaluated.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yi Su,Qizhan Zhang,Ge Song,Wenyang Fu,Minghua Zhou,Ying Zhang
A novel continuous-flow H 2 O 2 electrochemical generator using a natural air diffusion electrode (NADE) as the cathode was designed and the two compartments of the generator were separated by a cation exchange membrane. The reactor did not require aeration, which saved aeration energy consumption. The reactor showed good performance in generating H 2 O 2 up to 50.8 mg/h/cm 2 with the energy consumption of 25.2 kWh/kg H 2 O 2 , and maintained a high current efficiency of about 70–94% in the current density range of 20 to 100 mA/cm 2 . The yield of H 2 O 2 and current efficiency remained high and stable in a wide pH range of 3 ∼ 9. H 2 O 2 produced in the generator was delivered to a flow-Fenton reactor for the occurrence of the Fenton reaction and the degradation of sulfamethazine (SMT), which avoided the problem of excessive generation and ineffective consumption of H 2 O 2 in the electro-Fenton process and improved the utilization rate of H 2 O 2 . Moreover, due to the introduction of H 2 O 2 solution with low pH to the flow-Fenton reactor, the pH of the working solution did not need adjustment. The flow-Fenton process achieved 99% of SMT removal, 90% of H 2 O 2 utilization rate, and 54% of TOC removal within 20 min under the optimum conditions. The degradation of several other contaminants (2,4-dichlorophenoxyacetic acid, tetracycline and carbamazepine) was investigated and all of the removals were maintained above 97%. The study is promising for the practical electrochemical production of H 2 O 2 and application of flow-Fenton for contaminants degradation.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Shujun Sun,Jun Zhang,Changdong Sheng,Hui Zhong
Currently, most advanced oxidation denitrification technologies require long flue gas residence time to obtain ideal NO removal efficiency. The NaOH-catalyzed H 2 O 2 system proposed in this paper can obtain 98% NO removal efficiency under the condition of flue gas residence time of 3 s. The mechanism of NO removal and H 2 O 2 decomposition to O 2 were proposed. It was confirmed with ESR (Electron-spin-resonance), inhibitor experiments and UV-Vis spectrophotometer that the main group in the reaction process was·O 2 - radicals, which reacted with NO to form ONOO - , and ONOO - would be gradually transformed into NO 3 - and NO 2 - in the air. The effect of some primary factors on the NO removal efficiency and the percentage of H 2 O 2 decomposition to O 2 were also investigated. The increase of initial pH has a positive effect on NO removal, while the promotion of NO removal by increasing H 2 O 2 concentration and reaction temperature is limited and the increase of NO has a negative effect on NO removal. Initial pH has a dual impact on the percentage of H 2 O 2 decomposition to O 2 , H 2 O 2 concentration and reaction temperature promote the decomposition of H 2 O 2 to O 2 , while NO concentration has an inhibiting effect on it.
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RSC Advances
·
2021
·Vol. 12
·期 1
·595-601
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IF 3.361
Lijuan Chen,Xiang Li,Zezhi Li,Kejian Liu,Jianping Xie
Peroxidases are present widely in microorganisms and plants, and catalyze many reactions. However, the activity of natural peroxidases is susceptible to external conditions. We prepared carbon nanoparticles (CNPs) using an environmentally friendly and simple method. These CNPs were demonstrated to possess intrinsic peroxidase-like activity. CNPs could catalyze the reaction of a peroxidase substrate, 3,3,5,5-tetramethylbenzidine (TMB), in the presence of H2O2 to produce a blue solution at 652 nm. CNPs exhibited higher peroxidase activity than that of other carbon-based nanomaterials. Moreover, CNPs retained their high peroxidase activity after being reused several times. Glutathione (GSH) can change the blue color of oxidized TMB into a colorless hue at 652 nm. Based on this fact, qualitative and quantitative approaches were employed to detect GSH using a colorimetric method. This method showed a broad detection range (2.5–50 μM) with a limit of detection of 0.26 μM. This method was shown to be accurate for GSH detection in a cell culture medium compared with that using a commercial assay kit. Our findings could facilitate application of CNPs in biomedical areas.
研究领域:
纳米技术
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生物化学
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分析化学
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生物医学工程
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高影响因子
INORGANIC CHEMISTRY
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2018
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IF 4.7
He-Qi Zheng,Chun-Yan Liu,Xue-Yu Zeng,Jin Chen,Jian Lü,Rong-Guang Lin,Rong Cao,Zu-Jin Lin,Jin-Wei Su
Natural enzyme mimetics with high catalytic activity at nearly neutral pH values are highly desired for their applications in biological systems. Herein for the first time a stable MOF, namely MOF-808, has been shown to possess high intrinsic peroxidase-like catalytic activity under acidic, neutral, and alkaline conditions. As a novel peroxidase mimetic, MOF-808 can effectively catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine when H2O2 serves as oxidant, accompanied by a significant color variation in the solution. The catalytic activity and the color variation were greatly dependent on H2O2 concentration, and thus MOF-808 can be applied to the colorimetric sensing of H2O2. The H2O2 detection limit is 4.5 μM, and the linear range is 10 μM to 15 mM. In view of the significant inhibition effect produced by ascorbic acid, a facile and sensitive approach for colorimetric sensing of ascorbic acid was successfully established. The AA detection limit is 15 μM, and the linear range is 30–1030 μM. Further investigation found that the catalytic activity of MOF-808 could be mainly ascribed to the Zr–OH(OH2) groups. Such active Zr–OH(OH2) groups can be effectively shielded by gluconic acid, and subsequently the catalytic activity of MOF-808 was significantly suppressed. With these findings, a facile and selective colorimetric assay for glucose sensing has been successfully explored via combination of the glucose oxidation with the TMB oxidation. The glucose detection limit is 5.7 μM, and the linear range is 5.7–1700 μM. MOF-808 is one of the best colorimetric biosensors among the peroxidase mimics reported for H2O2, AA, and glucose detection.
研究领域:
材料科学
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分析化学
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生物化学
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xiao Zhang,Bin Ren,Xi Li,Biming Liu,Shiwen Wang,Peng Yu,Yanhua Xu,Guoqiang Jiang
Carbon-bridge-modified malonamide (MLD)/g-C 3 N 4 (CN) was prepared by copolymerization of MLD with urea and melamine and loaded with Fe 3 O 4 for the high-efficiency removal of tetracycline (TC) in water under photo-Fenton. The prepared catalysts were characterized by SEM, TEM , N 2 adsorption–desorption analysis, XPS, XRD, and FTIR, which proved that the modification method successfully introduced the C bridge into the carbon nitride molecular system and increased the structural defects of the catalyst. The Carbon-bridge-modified MLD/CN/Fe 3 O 4 also had good visible-light response and charge-separation and transport abilities in the photoelectrochemical test. Degradation results showed that the photo-Fenton degradation of TC reached 95.8%, and the mineralization rate was 55.7% within 80 min at 80 mM H 2 O 2 dosage, 0.5 g/L catalyst dosage, and near-neutral pH by 0.8MLD/CN/Fe 3 O 4 . Moreover, the oxidation products and mineralization pathways of TC were explored by LC-MS. Toxicity analysis indicated low environmental threat of the intermediates in TC mineralization. EPR analysis and H 2 O 2 decomposition efficiency analyses showed an improvement in the H 2 O 2 decomposition performance of 0.8MLD/CN/Fe 3 O 4 . This work could provide a valuable insight for the application of heterogeneous photo-Fenton technology in wastewater treatment .
研究领域:
环境科学
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化学工程
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材料科学
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水处理技术
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 2
·951-958
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IF 1.354
Lou Doudou,Tian Yanyan,Zhang Yu,Yin Junjie,Yang Ting,He Chuan,Ma Ming,Yu Wei,Gu Ning
We found that the peroxidase-like activity of gold nanoparticles (GNPs) followed the Michaelis-Menten kinetic model and was dependent on environmental pH and temperature, which was very similar to natural Horseradish Peroxidase (HRP). However, unlike HRP, which needs a lower H2O2
concentration with a very narrow range to reach a maximum reaction rate and avoid enzyme poisoning, GNPs have very high activity, even at an H2O2 concentration two orders of magnitude higher than HRP. It was demonstrated that H2O2 treatment could
enhance the peroxidase-like activity of GNPs, resulting thus in the activity increase in a circular catalytic reaction by the reduplicative use of GNPs. It was also found that the peroxidase-like activity of GNPs responded sensitively to nanoparticle size and surface modifications. When used
in an immunoassay, GNPs were generally conjugated with antibody and blocked with hydrophilic macromolecules to construct a nanoprobe. This strongly reduced the peroxidase-like activity and detection sensitivity of GNPs, therefore, restricting their use as peroxidase mimetics. We presented
a novel strategy that combined the nanoprobes with gold staining to expose fresh catalytic gold surfaces and obtained a great increase in detection sensitivity.
研究领域:
生物化学
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纳米技术
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分析化学
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免疫学
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高影响因子
MOLECULAR MEDICINE
·
2024
·Vol. 30
·期 1
·1-16
·
IF 6
Xie Bin,Chen Qiong,Dai Ziyu,Jiang Chen,Chen Xi
Background Chronic obstructive pulmonary disease (COPD) is a chronic inflammatory lung disease associated with high morbidity and mortality worldwide. Oxidative injury and mitochondrial dysfunction in the airway epithelium are major events in COPD progression.Methods and resultsThe therapeutic effects of Progesterone (P4) were investigated in vivo and in vitro in this study. In vivo, in a cigarette smoke (CS) exposure-induced COPD mouse model, P4 treatment significantly ameliorated CS exposure-induced physiological and pathological characteristics, including inflammatory cell infiltration and oxidative injury, in a dose-dependent manner. The c-MYC/SIRT1/PGC-1α pathway is involved in the protective function of P4 against CS-induced COPD. In vitro, P4 co-treatment significantly ameliorated H2O2-induced oxidative injury and mitochondrial dysfunctions by promoting cell proliferation, increasing mitochondrial membrane potential, decreasing ROS levels and apoptosis, and increasing ATP content. Moreover, P4 co-treatment partially attenuated H2O2-caused inhibition in Nrf1, Tfam, Mfn1, PGR-B, c-MYC, SIRT1, and PGC-1α levels. In BEAS-2B and ASM cells, the c-MYC/SIRT1 axis regulated P4’s protective effects against H2O2-induced oxidative injury and mitochondrial dysfunctions.Conclusion P4 activates the c-MYC/SIRT1 axis, ameliorating CS-induced COPD and protecting both airway epithelial cells and smooth muscle cells against H2O2-induced oxidative damage. PGC-1α and downstream mitochondrial signaling pathways might be involved.
研究领域:
呼吸病学
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药理学
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细胞生物学
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分子生物学
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Hongyan Cao,Bin Li,Xubao Jiang,Xiaoli Zhu,Xiang Zheng Kong
In contrast to conventional fluorescent polymers featured by large conjugation structures, a new class of fluorescent polymers without above conjugations are gaining constant interest owing to their significant academic importance and promising applications in diverse fields. These unconventional fluorescent polymers are in general composed of heteroatoms (e.g. N, O, P, and S) under different forms. Here we report our recent study on polyurea, prepared by a very simple one step precipitation polymerization of toluene diisocyanate in a binary solvent of water-acetone. This polyurea, basically consisting of phenyl ring and urea group, shows fluorescent emission in a broad concentration range, from very low (10 −5 mg/mL) to its solubility limit (50 mg/mL), and in a wide range of emission wavelength from UV to visible regions of up to 500 nm under varied excitation wavelength. The emission behaviors were fully studied under different concentrations and excitations. It was concluded that the emission in UV region was intrinsic due to the conjugation between the phenyl and the adjacent urea unit; while the emission in visible region, strongly excitation dependent, was caused by the cluster formation of the molecular chains, in accordance with the cluster-triggered-emission (CTE) mechanism. The formation of the cluster was tested through dynamic light scattering, FTIR and UV absorbance. Tested in presence of different metal ions, Fe 3+ demonstrated a quenching effect with high selectivity. Based on this study, different paper-based sensors were designed to detect Fe 3+ , H 2 O 2 in bioanalysis and for data encryption. This work provides a simple way to prepare a polyurea, a novel type of unconventional fluorescent polymer, with high emission performance distinct from its known analogues.
研究领域:
高分子化学
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材料科学
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分析化学
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生物技术
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高影响因子
Nanoscale Advances
·
2020
·Vol. 2
·期 4
·1583-1589
·
IF 0
Feng Lv,Yuzhu Gong,Yingying Cao,Yaoyao Deng,Shufeng Liang,Xin Tian,Hongwei Gu,Jun-Jie Yin
Effective alcohol detection represents a substantial concern not only in the context of personal and automobile safety but also in clinical settings as alcohol is a contributing factor in a wide range of health complications including various types of liver cirrhoses, strokes, and cardiovascular diseases. Recently, many kinds of nanomaterials with enzyme-like properties have been widely used as biosensors. Herein, we have developed a convenient detection method that combines Au@PtRu nanozymes and alcohol oxidase (AOx). We found that the Au@PtRu nanorods exhibited peroxidase-like catalytic activity that was much higher than the catalytic activities of the Au and Au@Pt nanorods. The Au@PtRu nanorod-catalyzed generation of hydroxyl radicals in the presence of H2O2 was used to develop an alcohol sensor by monitoring the H2O2 formed by the oxidation of alcohol to acetaldehyde in the presence of AOx. When coupled with AOx, alcohol was detected down to 23.8 μM in a buffer solution for biological assays. Notably, alcohol was successfully detected in mouse blood samples with results comparable to that from commercial alcohol meters. These results highlight the potential of the Au@PtRu nanorods with peroxidase-like activity for alcohol detection, which opens up a new avenue for nanozyme development for biomedical applications.
研究领域:
生物传感器
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纳米技术
·
分析化学
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生物医学工程
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