JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Xiuying Liu,Jiao Zhou,Qianna Xia,Bowen Li,Qiaohui Gao,Shuaiqi Zhao,Aimal Khan,Aihua Xu,Xiaoxia Li
The development of efficient and eco-friendly Mn-based hybrids for the degradation of biorefractory organic pollutants via peroxymonosulfate (PMS) activation is highly desired. In this study, a novel graphite nanosheet (GNs)-based Fe-Mn bimetallic oxide (Fe doped birnessite MnO 2 , FeMn/GNs) was synthesized under mild conditions. Compared with monometallic Fe or Mn oxide on GNs, FeMn/GNs exhibited a higher surface area, decreased Mn oxidation states, stronger interaction with GNs, and more active sites for PMS adsorption. Among different Fe/Mn ratios, Fe 2 Mn 1 /GNs showed the optimum performance for bisphenol A (BPA) degradation with the first-order rate constant of 0.22 min −1 , which was about 8.5 and 12.9 times higher than that of Mn/GNs and Fe/GNs, respectively. Different from the pollutant-catalyst-PMS electron transfer mechanism for Mn/GNs, the direct two-electron transfer in FeMn/GNs+PMS system, was mainly processed between the simultaneously activated BPA and PMS. This was probably based on the double adsorption sites of Fe and Mn species on the same catalyst: PMS was adsorbed by Fe species through hydroxyl groups, while BPA was mainly coordinated with Mn species due to the layered structure and hydrophobicity of the Mn oxide. This study is expected to provide the rational design of efficient Mn-based hybrids for PMS activation.
研究领域:
环境科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Di Jiang,Nan Lu,Leibo Li,Haoqun Zhang,Jiashuang Luan,Guibin Wang
Compressibility of zinc-manganese oxide (Zn-MnO 2 ) batteries is an essential element of modern flexible electronics. Hydrogel electrolytes with superior elasticity and compressibility are highly demand to guarantee a stable energy output of the flexible Zn-MnO 2 battery. Herein, a highly compressible hydrogel electrolyte was developed by introducing soybean protein isolate nanoparticles (SPI) into covalently cross-linked polyacrylamide (PAAM) polymer networks . The SPI/PAAM hydrogel electrolyte for Zn-MnO 2 battery possessed outstanding reversible compressibility due to the aggregation of SPI nanoparticles on the PAAM chains through the weak electrostatic interaction , which could dissipate energy effectively. Consequently, the Zn-MnO 2 battery based on the compressible hydrogel electrolyte displayed a decent specific capacity (299.3 mA h g −1 ) and desirable capacity retention rate (78.2%) after 500 charge/discharge cycles. Notably, the device could maintain stable power output under 96% compress strain and light the bulb even under severe mechanical stimulation like being-bent and hammered. It’s believed that the compressible Zn-MnO 2 batteries hold enormous potential as the energy storage devices in the field of flexible wearable electronics.
研究领域:
材料科学
·
电化学
·
柔性电子
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 5
·1-9
·
IF 5.3
Yan Qinghua,Wu Ruixue,Wang Jiaxin,Mao Jian,Nan Wenbin
Abstract To accurately detect tumor marker carbohydrate antigen 72-4 (CA72-4) of serum samples is of great significance for the early diagnosis of malignant tumors. In the present study, MnO 2 /hollow nanobox metal-organic framework (HNM)-AuPtPd nanocomposites were prepared via multi-step synthesis and superposition method and a series of characterizations were carried out. A highly sensitive immunosensor Ab/MnO 2 /HNM-AuPtPd/GCE based on the composite nanomaterial was further prepared and used to detect the tumor marker CA72-4. The constructed immunosensor achieved signal amplification by increasing the electrocatalytic activity to H 2 O 2 by means of the synergistic effect of MnO 2 ultra-thin nanosheets (MnO 2 UNs) and HNM-AuPtPd. At the same time, the electrochemical properties of the immunosensor were analyzed using cyclic voltammetry, electrochemical impedance, amperometry (with the test voltage of −0.4 V), and differential pulse voltammetry. The experimental results showed that the MnO 2 /HNM-AuPtPd nanocomposites were successfully prepared, and the immunosensor Ab/MnO 2 /HNM-AuPtPd/GCE demonstrated an excellent electrochemical performance. The electrochemical immunosensor had the highest detection sensitivity under the optimal experimental conditions, such as incubation pH of 7.0, incubation time of 60 min, with the addition of 15 μL of H 2 O 2 , and in the concentration range 0.001–500 U/mL. It had a low detection limit of 1.78×10 −5 U/mL (S/N = 3). Moreover, the serum sample recovery were in the range from 99.38 to 100.52%. This study provides a new method and experimental basis for the detection of tumor markers in clinical practice. Graphical Abstract
研究领域:
生物医学工程
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分析化学
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肿瘤学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2019
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IF 7.467
Yunzhao Liu,Xiaowei Chi,Qi Han,Yuexiu Du,Jiaqi Huang,Yu Liu,Jianhua Yang
Rechargeable Zn-ion batteries (ZIBs) have attracted extensive attention, but their practical application is hindered by the limited cycling life and complicated preparation process of cathode materials . Here, we develop a facile yet scalable chemical precipitation/spray-granulation combined methodology for the fabrication of α-MnO 2 nanofibers/carbon nanotubes hierarchically assembled microspheres (α-MnO 2 /CNT HMs) as the cathode material for aqueous ZIBs . The α-MnO 2 evenly anchoring to the CNTs-based framework shows significantly increased tap density compared with pristine α-MnO 2 , which can effectively enhance the electrochemical stability. Owing to the synergistic merits of highly conductive carbon nanotubes network and α-MnO 2 nanofibers with desirable structure features, within our knowledge, the highest areal energy density of 0.98 Wh cm −2 at 0.2 A g −1 and the record cycling stability with 96% capacity retention over 10000 cycles at 3 A g −1 among the reported cathodes for ZIBs are achieved. Zn 2+ and H + co-insertion reaction mechanism with high reversibility is further revealed. Fast kinetic of the H + insertion/extraction process renders the cell excellent cycling stability. Facile preparation of nanofibrous α-MnO 2 based micro-composite, cost benefit of the source materials, and the superior battery performance provide new approaches for the practical applications of ZIBs.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
VACUUM
·
2020
·
IF 2.906
Jiaxing Song,Tao Guo,Miao Yao,Jialin Chen,Wen Ding,Fengli Bei,Yiming Mao,Zhongshen Yu,Junyi Huang,Xiaonan Zhang,Qin Yin,Shuo Wang
The performance of energetic materials is mainly reflected in two aspects, thermal performance and combustion performance. To figure out the differences in reaction performance, in this paper, thermal and combustion properties of Al/CuO, Al/Fe 2 O 3 and Al/MnO 2 nanothermites were studied respectively by thermal analysis and fast heating wire experiments. According to the thermal analysis, the exothermic peak temperature points of Al/MnO 2 , Al/CuO, Al/Fe 2 O 3 nanothermites were 552.1 °C, 563.1 °C and 565.3 °C, respectively, while the sequence of activation energy calculated from low to high was Al/Fe 2 O 3 , Al/CuO, Al/MnO 2 nanothermites. By the way, the values of Al/CuO and Al/Fe 2 O 3 nanothermites showed little difference in temperature and activation energy. The ignition energy characterized by direct current had little difference among them, and the sequence from low to high was Al/MnO 2 , Al/Fe 2 O 3 , Al/CuO nanothermites, corresponding to 1.169 A, 1.214 A and 1.221 A, respectively. As for burning rate, Al/CuO burnt the fastest clearly while the Al/Fe 2 O 3 burnt the longest. In terms of combustion performance, Al/CuO and Al/MnO 2 were basically the same, with little splash of sparks, and the concentrations of combustion energy were better. The combustion phenomenon of Al/Fe 2 O 3 nanothermite was quite unique with a large number of scattered sparks and poor energy concentration. Finally, the intrinsic reasons for above different phenomena of these three nanothermites were analyzed and discussed.
研究领域:
材料科学
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化学工程
·
燃烧科学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-11
·
IF 5.3
Huang Ziyu,Yang Guangwei,Deng Qiuling,Zhang Xuhui,Wei Xiaoping,Li Jianping
Methidathion (MTDT), a common organophosphorus pesticide with high insecticidal activity, is widely used for pest control. However, the misuse of MTDT leads to widespread residues and endangers human health. Therefore, it is crucial to develop a simple and highly sensitive method for the detection of MTDT residues. Herein, ZIF-90/MnO 2 /g-C 3 N 4 /Fe 3 O 4 composite particles were synthesized: The MnO 2 nanosheets could absorb the energy of the excited g-C 3 N 4 to quench the ECL of g-C 3 N 4 while ZIF-90 acted as a mimetic enzyme to catalyze the formation of thiocholine from MTDT. The thiocholine caused the reduction of MnO 2 to Mn 2+ , restoring the ECL signal of g-C 3 N 4 . Combined with molecular imprinting technique, an electrochemiluminescence sensor was constructed for the determination of MTDT. The determination range was 1.00 × 10 –9 ~ 7.00 × 10 –7 g/L, and the detection limit was 6.58 × 10 –10 g/L. Structurally similar organophosphorus pesticides showed no cross-reactivity. The method has high sensitivity and specificity, and has been successfully applied to the determination of MTDT residue in fruits with recoveries in the range 93.75% ~ 102.37%. Graphical abstract
研究领域:
分析化学
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环境科学
·
农药检测
✓ 已验证
DOI
PubMed
高影响因子
TALANTA
·
2020
·
IF 5.339
Yun Shu,Jinlong Gao,Jingyuan Chen,Jing Yan,Jiawei Sun,Dangqin Jin,Qin Xu,Xiaoya Hu
Near−infrared (NIR) emitting Ag 2 S quantum dots (QDs) are excellent fluorescent nanoprobes for bioassays with low toxicity. A novel fluorescent sensing platform which employing NIR fluorescent Ag 2 S QDs and MnO 2 2D nanosheets as NIR emitters and quenchers is designed for rapid and selective determination of glutathione (GSH). A facile and efficient approach was demonstrated for the synthesis of NIR fluorescent Ag 2 S QDs with the emission of 845 nm. Then the NIR fluorescent nanoprobe of Ag 2 S QDs−MnO 2 nanosheets is obtained by adsorbing Ag 2 S QDs onto the surface of MnO 2 nanosheets which have atomically thick two−dimensional structure and high specific surface area. And the NIR fluorescence of Ag 2 S QDs is quenched by the MnO 2 nanosheets. The presence of GSH could reduce MnO 2 to Mn 2+ that results in the restoration of NIR fluorescence for Ag 2 S QDs. The NIR fluorescent nanoprobe could be used for highly selective detection of GSH. Also a low detection limit of 60 μmol/L was obtained. Because NIR fluorescence of the Ag 2 S QDs can efficiently reduce the interferences from background scattering and autofluorescence. The NIR fluorescent nanoprobe was directly applied to monitor the GSH level in human serum sample with high accuracy and precision.
研究领域:
生物传感
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纳米医学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yaru Zhang,Zhenchao Li,Xin Zhang,Mingyang Wang,Ziting Lin,Ying Zhang,Aihua Liu
Nanozymes have favorable activity and good stability, which are potential alternatives to natural enzymes and widely applied in biosensing. However, nanozymes based electrochemical sensors are fewer, because many nanozymes are not easy to form efficient electrocatalytic interface and experience interference from the possible oxidizable species. Herein, ultrathin MnO 2 nanosheets (MnO 2 NSs) were synthesized by reduction of KMnO 4 in acidic environment by chemical precipitation method. The MnO 2 NSs show excellent catechol oxidase mimicking activity. The steady-state kinetics of MnO 2 NSs shows a higher V max of 3.441 µM s −1 . Additionally, the catalytic mechanism is that in the presence of oxygen, catechol or its analogues are oxidized to quinone or quinoids, while oxygen is reduced to H 2 O. Afterwards, the possible mechanism of dopamine (DA) at MnO 2 NSs-modified electrode is investigated. DA is first catalytically oxidized to dopamine quinone (DQ) by MnO 2 NSs based catechol oxidase , which further undergoes irreversible electrochemical reduction to DA involving two protons and two electrons transfer during the process. On the basis of this, a selective and ultrasensitive amperometric detection of DA at 0.0 V (vs. SCE) was explored, which have two linear parts, 0.01–20 μM and 20–100 μM DA with the LOD of 4.1 nM (S/N = 3). Most importantly, the presence of oxidizable species including ascorbic acid, uric acid and cysteine may coexist with DA in biological systems do not exhibit any appreciable interference. The as-proposed method was applicable to detect DA in human serum samples with good satisfactory accuracy and recovery. This research casts prospect to apply nanozymes for electrochemical sensor with excellent analytical performance.
研究领域:
生物化学
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分析化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 3
·1120-1126
·
IF 3.591
Wenwen Liu,Qing Kang,Pengcheng Wang,Feimeng Zhou
The ratiometric fluorescence immunoassay is known as a spectrofluorimetric variant for the sensitive and quantitative analyses of biomarkers. However, there are few comparative studies between it and the traditional, single-wavelength-based immunoassay. In this work, a ratiometric fluorescence immunoassay was designed via fluorescence resonance energy transfer (FRET) in a system comprising MnO2 nanosheets, o-phenylenediamine (OPD), and fluorescent carbon nanodots (FCNs). The MnO2 nanosheet oxidizes OPD, producing a fluorescence peak at 580 nm, while FCNs exhibit a fluorescence peak at 490 nm. Under the effect of FRET, the fluorescence at 580 nm increases significantly while the fluorescence at 490 nm is reduced. The FRET effect was confirmed by our fluorescence lifetime measurements. We optimized the experimental conditions that include solution pH, OPD concentration, and reaction time. By electrostatically coating the MnO2 nanosheets with antibody molecules and using the resultant materials as a detection probe, the ratiometric fluorescence sensing was extended to the detection of alpha fetoprotein (AFP) in human serum samples on a 96-well titer plate. Our ratiometric fluorescence immunoassay possesses a good dynamic range (from 0.14 to 130.43 pM). The detection limit was estimated to be 0.13 pM (0.009 ng mL−1), which is 7.6-fold lower than that of the single-wavelength-based immunoassay. The measurement results of serum samples from healthy and patient donors are highly comparable to those measured by chemiluminescence for the same donors, demonstrating the viability for serological assays of important cancer markers.
研究领域:
生物化学
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医学检验
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Xuehan Xiao,Zongxue Yu,Zhong Yang,Juan Wang,Qingcan Xiang Ximei Zhu
The treatment of oilfield wastewater has been a problem for oil workers for a long time. Indeed, it is economical, efficient and environmental friendly to treat oilfield wastewater with membrane. However, the contamination and stability of membrane limit the application of membranes. This study focuses on improving the long-term integrated treatment of oilfield wastewater by commercial PVDF membranes in different environments. Sepiolite(Sep)@MnO 2 composites were synthesized by hydrothermal method . SEP@MnO 2 and graphene oxide(GO) were left on the commercial PVDF membrane after vacuum filtration. Then the membrane was subjected to 120 vacuum thermal reduction. The prepared Sep@MnO 2 /RGO composite membrane showed good separation result and flux for different proportion of oilfield wastewater. Moreover, it can remove some common salt (NaCl,MgSO 4 , CaCl 2 , MgCl 2 ) and heavy metal ions (Ni 2+ , Fe 3+ , Cr 6+ ) in oilfield wastewater. Even more valuable, a few addition of H 2 O 2 to oilfield wastewater caused an oxidation reaction and the produced in situ microbubbles greatly enhance the antifouling property of the membrane. After 15 cleaning tests and 12 h of cycling, the membrane still showed strong separation ability. Compared with other oil-water separation membranes reported, this membrane demonstrated a longer and better separation effectively. All the work promotes the application of membrane separation technology in oilfield wastewater treatment . Hopefully, the application of in-situ microbubble method on membrane will solve the problem of membrane pollution in oilfield wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2020
·
IF 7.635
Zhen Lei,Zhenyu Li,Meiling Guo,Pei Li,Teng Da,Sicai Wang,Yuanpeng Wu,Yi He,Jingyu Chen
Filtration membranes (FMs), with robust anti-fouling performance, are highly desirable for practical oily wastewater purification but still a challenge to be realized without water pre-wetting procedure. Herein, we demonstrate a novel and effective route to address this challenge by decorating MnO 2-x nanowires on carbon cloth membrane (MCM) via simple hydrothermal method , in which the existence of oxygen vacancies on the outer surface of MnO 2-x nanowires can greatly enhance the H 2 O adsorption capacity even under oil, thus the oil-fouling problem can be solved by simply immersing the oil-polluted membrane into water and shaking. Besides the superamphiphilic performance in air and underwater superoleophobic (underwater oil contact angle > 155° against diverse oils), our MCM also exhibits unexpected under-oil superhydrophilic properties, Moreover, high separation efficiency for diverse oil/water mixtures (>99.8%) and oil-in-water emulsions (>98.3%) have been also achieved based on our product. These outstanding properties make our sample hold a great potential in practical oily/water purification.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3399-3404
·
IF 4.58
Song Hu,Wang Yunhan,Wang Guanquan,Wei Hongyuan,Luo Shunzhong
The authors report on a chromogenic system based MnO 2 nanosheet and the chomgenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB). The MnO 2 nanosheet can oxidize TMB in acidic environment to form a yellow solution with an absorption peak at 450 nm. The process does not require the presence of an enzyme or H 2 O 2 . However, on addition of ferrous ion to the chromogenic system, the MnO 2 nanosheet is decomposed via the redox reaction that occurs between Fe(II) and MnO 2 . As a result, the intensity of the absorption at 450 nm is reduced. This finding is exploited in a photometric method for determination of Fe(II) that shows high selectivity and a 0.3 μM detection limit (based on the 3σ/slope criterion). Fe(II) can also be detected visually in concentrations down to 100 μM. The method was applied to the determination of Fe(II) in spiked water samples and gave satisfactory recoveries.
Schematic illustration of the chromogenic system composed of MnO 2 nanosheets and 3,3′,5,5′-tetramethylbenzidine (TMB) for highly sensitive colorimetric detection of ferrous ion (Fe 2+ )
研究领域:
分析化学
·
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）