RSC Advances
·
2017
·Vol. 7
·期 27
·16423-16427
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IF 3.108
Guangming Li,Nan Lv,Jilin Zhang,Jiazuan Ni
A sensitive fluorescent nanosensor based on MnO2 quenching fluorescent carbon quantum dots was facilely developed by MnO2 in situ formed in the pores of C-dots/ZIF-8 hybrid nanocomposite. The C-dots/ZIF-8 hybrid nanocomposite was synthesized via a rapid method within 5 min at room temperature. Then, the MnO2 was directly incorporated into the ZIF-8 framework via redox reaction between the C-dots/ZIF-8 hybrid nanocomposite and KMnO4. The resulting fluorescent nanosensor exhibited a relatively uniform particle size of about 100 nm, good water-dispersibility and a highly selective fluorescence response toward ascorbic acid with a detection limit as low as 83 nM and a linear range of 0.5–8 μM.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2019
·Vol. 166
·期 15
·B1653
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IF 3.12
Duozhe Chen,Shuang Wang,Maoxiang Liu,Juanjuan Gao,Haiou Song,Shupeng Zhang
Bionics-inspired streptococcus-like NiCo2O4 coated needle-like MnO2 architecture has been synthesized successfully, denoted as NiCo2O4-MnO2, and the nonenzymatic electrochemical sensor based on NiCo2O4-MnO2 exhibits highly sensitive determination toward glucose. MnO2 nanowires are regarded as effective nucleation sites, which allows uniformly growing of NiCo2O4 as electrocatalytic centers on its surface by a hydrothermal method. The rational combination of streptococcus-like NiCo2O4 and needle-like MnO2 can effectively prevent the aggregation of nanomaterials due to the formation of 3D network, promote the electron transportation, and provide more electrocatalytic sites. The attractive nanostructure and composition were better confirmed by scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy, etc. The strong coupling of NiCo2O4-MnO2 inspires the synergistic effect, showing a low detection limit of 0.036 μM (S/N = 3) for glucose in 0.1 M NaOH, a high sensitivity of 2887.57 μAmM−1cm−2 and a wide response range (from 1 to 7100 μM). Moreover, the novel sensor exhibited high stability and good reproducibility. The sensor was highly selective to glucose in the presence of commonly interfering species like dopamine, uric acid, ascorbic acid, sodium chloride, fructose, galactose and mannose, and successfully applied to sensing glucose concentration in human serum samples.
研究领域:
材料科学
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生物医学工程
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分析化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Jing Deng,Yongjian Ge,Chaoqun Tan,Hongyu Wang,Qingsong Li,Shiqing Zhou,Kejia Zhang
Nanoscale α-MnO 2 with different morphologies (nanoparticles, nanoflowers and nanorods) were synthesized via a facile hydrothermal method and tested in peroxymonosulfate (PMS) activation for ciprofloxacin (CIP) degradation. The catalytic activity of α-MnO 2 mainly relied on the specific surface area and crystallinity, and followed the order of α-MnO 2 nanoflowers > α-MnO 2 nanorods > α-MnO 2 nanoparticles > commercial MnO 2 . Acidic condition was more beneficial to CIP removal than neutral condition, and the degradation would be greatly accelerated in alkaline circumstance. The introduction of chloride and bicarbonate displayed concentration-dependent dual effect. The presence of natural organic matter (NOM) exerted the detrimental effect on CIP degradation. Eleven oxidation products were identified by UPLC–MS/MS and the changes of their concentrations were monitored, five products showed monotonous uptrend while four intermediates present monotonous downtrend once they were generated. Piperazine ring cleavage, hydroxylation and F/OH substitution were found to be the important oxidation pathways. The acute toxicity of resulted solution gradually decreased with the lapse of time, and higher PMS concentration favored the detoxification. The CIP removal in α-MnO 2 /PMS process was also efficient under the actual water background, which was testified by the results of fluorescence excitation-emission matrix (EEM).
研究领域:
环境科学
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化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yufei Wang,Yong Ma,Jingjing Zhou,Kehe Su,Baoliang Zhang,Qiuyu Zhang
Fe 3 O 4 @MnO 2 hollow microspheres with a high specific surface area were prepared by hydrothermal method, and the MnO 2 nanosheets were stacked on the surface of Fe 3 O 4 hollow microspheres to form corolla-like microspheres. Based on the successful fabrication of these microspheres, bovine serum albumin (BSA)-imprinted Fe 3 O 4 @MnO 2 microspheres were fabricated via free radical polymerization. Water-soluble modified chitosan and 2-hydroxyethyl acrylate (HEA) were used as functional molecules, because of their good biocompatibility and affinity with protein, which were demonstrated by circular dichroism spectrum and computational methods. The prepared imprinted materials exhibited the excellent imprinted performance for BSA. The adsorption amount (Q), the imprinting factor (IF), and the selectivity factor (β) were 140.6 mg/g, 3.3, and 5.5, respectively.
研究领域:
生物化学
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材料科学
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医学检测
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Juanjuan Feng,Yu Tian,Kunlin Li,Fei Wang,Kai Li,Ping Ning
Toxic H 2 S limits the high-value utilization of high-concentration CO in yellow phosphorus tail gas. High-performance adsorbents play a significant role in the purification of yellow phosphorus tail gas and the recovery of CO. In this study, manganese-based adsorbents doped with other metals (Cu, Co, Ni, Ce, and Fe) were synthesized and tested for H 2 S removal. The results demonstrate that doping α-MnO 2 with metals significantly enhances its desulfurization performance. Notably, the 20 % Ni/Mn adsorbent achieves the best performance, exhibiting an adsorption duration of approximately 50 h under test conditions and H 2 S capacity up to 854.35 mg/g. Mechanism studies show that the performance improvement is mainly attributed to the doping of Ni, which disrupts the growth of the α-MnO 2 rod-like structure, promoting the formation of fine particles and exposing more crystal interfaces. This is conducive to the migration and release of active lattice oxygen species on the adsorbent, thereby enhancing the adsorption-oxidation performance of the adsorbent for H 2 S. Moreover, Ni significantly promotes the formation of high-valent Mn, enhancing the adsorbent’s oxidation capability and facilitating the decomposition of H 2 S. This study proposes an innovative synthetic strategy for constructing adsorbents with high H 2 S adsorption performance under anaerobic and dry conditions.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2024
·
IF 8.5
Jingfang Guo,Feng Zhao,Zhenhui Yue,Zhen Lei
Rapid and accurate detection of carbosulfan residues in vegetables is important for ensuring food safety. Herein, based on the unique hydrolysis behavior of carbosulfan, a nanozyme-based colorimetric sensing platform was proposed for detection of carbosulfan. Hollow polydopamine/MnO 2 nanoparticles (H-PDA/MnO 2 NPs) with excellent oxidase-like activity were synthesized, which can promote the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) into blue oxidative product (oxTMB). Under acidic conditions, carbosulfan can be decomposed and produce reductive sulfide species (-SH), which are capable to disintegrate MnO 2 NPs, resulting in decreased oxidase-like activity of H-PDA/MnO 2 NPs. Based on the inhibitory effect on oxidase activity of H-PDA/MnO 2 NPs, an acetylcholinesterase-free colorimetric assay was proposed for detection of carbosulfan with low limit of detection of 0.63 ng mL −1 . Integrating test swabs with smartphone, a portable colorimetric sensor was constructed, showing great potential for on-site detection. To demonstrate the feasibility of this method, carbosulfan in real vegetable samples were determined.
研究领域:
食品安全
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分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
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2024
·
IF 5.2
Xin Xu,Bolin Xia,Amirreza Gholivand,Xiaoyu Zhang,Yunpeng Zhang,Linhui Liu,Daiqi Ye,Peirong Chen
Selective dissolution is highly promising for tailoring the structures and functions of metal oxides toward various applications. Here, we demonstrate a successful fabrication of porous γ-MnO 2 by selectively dissolving Ca in a CaMnO 3 perovskite (CMO) via dilute HNO 3 treatment. The perovskite-derived γ-MnO 2 (denoted as CMO-72 h) outperformed drastically the pristine CaMnO 3 and a commercial γ-MnO 2 in the catalytic oxidation of NH 3 and NO, two representative gaseous pollutants in the atmosphere. Physicochemical characterization by X-ray photoelectron spectroscopy and temperature-programmed techniques (including H 2 -TPR, O 2 -TPD and NH 3 -TPD) suggests that the excellent catalytic performance of CMO-72 h is associated with its low–temperature reducibility and abundant surface–active oxygen species. Specifically, acid treatment led to the oxidation of Mn 3+ to Mn 4+ on the surface, increasing significantly the Mn 4+ /Mn 3+ ratio from 0.76 (for CMO) to 1.45 (for CMO-72 h) and, meanwhile, generating additional surface oxygen vacancies . As a result, O 2 molecules can be easily adsorbed and activated on the CMO-72 h, leading to improved performance in NH 3 and NO oxidation. This study may offer new opportunities in the synthesis of high-performance Mn oxide catalysts for environmental applications.
研究领域:
环境科学
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材料科学
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催化化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2014
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IF 4.058
Jie Liu,Zhiwei Zhao,Penghui Shao,Fuyi Cui
Heterogeneous catalysts with low cost, little hazardous, high effective and facile separation from aqueous solution are highly desirable. In this study, magnetic Fe 3 O 4 –MnO 2 core–shell nanocomposites with various Fe/Mn weight ratios were synthesized through a facile one pot method and then characterized. These as-synthesized solids were applied to activate the peroxymonosulfate (PMS) for 4-chlorophenol degradation. The sample 3 with a Fe/Mn molar ratio of 4:1, which can be separated conveniently through external magnetic field, exhibited higher activity than other Fe 3 O 4 –MnO 2 nanocomposites, pure MnO 2 and physical mixture of Fe 3 O 4 and MnO 2 . The effects of operational parameters on the catalytic activity of sample 3, including initial Oxone and pollutant dosage, pH and catalyst dosage, were assessed. The catalyst had high stability and good reusability according to five successive repeated reaction. The reactive radicals generated in the PMS/Fe 3 O 4 –MnO 2 nanocomposites system were sulfate radical (SO 4 − ) and hydroxyl radical ( OH). The enhancement of the nanocomposites may be attributed to the interaction of Fe 3 O 4 with MnO 2 on the basis of the in situ ATR-FTIR analysis and XPS spectrum.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CATALYSIS TODAY
·
2020
·
IF 5.825
Linhao Yu,Hong Chen,Zhe Wen,Mengmeng Jin,Zewei Ma,Xueli Ma,Yushuai Sang,Mengmeng Chen,Yongdan Li
Selective oxidation of 5-hydroxymethylfurfural (HMF) to 2, 5-diformylfuran (DFF) with molecular oxygen is realized with an α-MnO 2 catalyst under mild conditions. In this work, α-MnO 2 exhibited the best performance among the samples examined. Meanwhile, solvent shows a significant effect on the product selectivity and isopropanol is found good for improving the selectivity of DFF. 93.2 % conversion of HMF was achieved at 140 °C for 4 h with 84.3 % selectivity of DFF. Moreover, α-MnO 2 catalyst keeps good reusability in recycling for five times. The reaction pathway indicated that the lattice oxygen species on α-MnO 2 is involved in the selective oxidation of hydroxyl group in HMF molecule.
研究领域:
催化化学
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绿色化学
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2022
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IF 6.796
Le Thi Thao,To Van Nguyen,Van Quy Nguyen,Ngoc Man Phan,Ki Jae Kim,Nguyen Nhat Huy,Nguyen Trung Dung
Wastewater containing an azo dye Orange G (OG) causes massive environmental pollution , thus it is critical to develop a highly effective, environmental-friendly, and reusable catalyst in peroxymonosulfate (PMS) activation for OG degradation. In this work, we successfully applied a magnetic MnFe 2 O 4 /α-MnO 2 hybrid fabricated by a simple hydrothermal method for OG removal in water. The characteristics of the hybrid were investigated by X-ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, Fourier transform infrared spectroscopy , Brunauer–Emmett–Teller method, vibrating sample magnetometry, electron paramagnetic resonance, thermogravimetric analysis , and X-ray photoelectron spectroscopy. The effects of operational parameters (i.e., catalytic system, catalytic dose, solution pH, and temperature) were investigated. The results exhibited that 96.8% of OG degradation was obtained with MnFe 2 O 4 /α-MnO 2 (1:9)/PMS system in 30 min regardless of solution pH changes. Furthermore, the possible reaction mechanism of the coupling system was proposed, and the degradation intermediates of OG were identified by mass spectroscopy . The radical quenching experiments and EPR tests demonstrated that SO 4 • ̶ , O 2 • ̶ , and 1 O 2 were the primary reactive oxygen species responsible for the OG degradation. The hybrid also displayed unusual stability with less than 30% loss in the OG removal after four sequential cycles. Overall, magnetic MnFe 2 O 4 /α-MnO 2 hybrid could be used as a high potential activator of PMS to remove orange G and maybe other dyes from wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
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2022
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IF 5.545
Li Yongfeng,Liao Qianyan,Ling Weizhao,Ye Fan,Liu Fangfang,Zhang Xipeng,He Jiajun,Cheng Gao
Exploring high-efficiency and stable monolithic structured catalysts is vital for catalytic combustion of volatile organic compounds. Herein, we prepared a series of Pd/δ-MnO2 nanoflower arrays monolithic integrated catalysts (0.01–0.07 wt% theoretical Pd loading) via the hydrothermal growth of δ-MnO2 nanoflowers onto the honeycomb cordierite, which subsequently served as the carrier for loading the Pd nanoparticles (NPs) through the electroless plating route. Moreover, we characterized the resulting monolithic integrated catalysts in detail and evaluated their catalytic activities for toluene combustion, in comparison to the controlled samples including only Pd NPs loading and the δ-MnO2 nanoflower arrays. Amongst all the monolithic samples, the Pd/δ-MnO2 nanoflower arrays monolithic catalyst with 0.05 wt% theoretical Pd loading delivered the best catalytic performance, reaching 90% toluene conversion at 221°C at a gas hourly space velocity (GHSV) of 10,000 h−1. Moreover, this sample displayed superior catalytic activity for o-xylene combustion under a GHSV of 10,000 h−1. The monolithic sample with optimal catalytic activity also displayed excellent catalytic stability after 30 h constant reaction at 210 and 221°C.
研究领域:
环境科学
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催化材料
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化学工程
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 41
·15340-15347
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IF 8.307
Lin Tian,Zijun Huang,Weidan Na,Yuanyuan Liu,Shuai Wang,Yu He,Wenjing Cheng,Tianzi Huang,Zhao Li,Tongxiang Li
The biocatalytic design of nanomaterials with enzyme-like activity is considered a reliable and promising toolkit for the generation of diagnostic agents in complex biological microenvironments. However, the preparation of nanomaterials while maintaining a high catalytic activity in tumor cells (pH 6.0–6.5) poses a prominent challenge. Herein, we constructed a biomimetic enzyme-trigged dual-mode system with colorimetry at 652 nm and photothermal biosensors to detect glutathione based on hollow MnO2-nanosheet-decorated Ag nanowires (Ag@MnO2) as an oxidase-like nanozyme. As expected, Ag@MnO2 catalyzed the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the absence of H2O2, leading to a blue-colored oxidized TMB (oxTMB) that displayed oxidase-like activity in pH 6.0. Interestingly, the portable dual-mode colorimetry and photothermal method for GSH was developed based on the redox reaction between GSH and oxTMB. This detection method exhibited a wide linear range of 0.1–55 μM for GSH with a low detection limit of 0.08 μM. This work highlights a new insight into nanotechnology by taking advantage of biomimetic design in biological analysis.
研究领域:
生物化学
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纳米医学
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诊断学
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DOI
高影响因子
危险品化学品经营许可证（带存储）