ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Hui Li,Ziyi Wang,Jingye Zhao,Yuwei Guan,Yueying Liu
A dual colorimetric and ratiometric fluorescent assay is constructed for the detection of glutathione (GSH) based on MnO2 nanosheets (MnO2 NS). Amplex Red (AR) and curcumin (CUR) fluorescence-pairing probes have opposite responses to MnO2 NS with fluorescence quenching and oxidase-like property. MnO2 nanosheets can largely quench the fluorescence of curcumin. However, the fluorescence of oxidized AR (oxAR) was obviously raised via the catalytic oxidation reaction of no fluorescent AR. The color of the solution gradually changes from yellow to orange. However, MnO2 nanosheets lose the fluorescence quenching capacity and oxidase-like property after the addition of GSH. Therefore, the fluorescence intensity of curcumin shows an obvious increase and the intensity of oxAR a decrease, accompanied by the restoration of the solution color from orange to yellow. For MnO2 nanosheets, the linear relationship between the absorbance ratio of the two substrates and the GSH concentration (50–15 000 nM) is obtained with the detection limit of 16 nM. Besides, the ratiometric fluorescent method has a good linear range from 10 to 5000 nM for GSH. The detection limit is as low as 4.2 nM. Further, this method can not only be used for the determination of GSH in an aqueous solution but also shows a high responsive ability to GSH in human serum. This result indicates its potential in bioanalysis and disease diagnosis.
研究领域:
分析化学
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生物化学
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纳米技术
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生物医学工程
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Xueming Bao,Leilei Wu,Yuanyuan Yu,Bo Xu,Li Cui,Man Zhou,Qiang Wang,Ping Wang
Nowadays, with the rapid growth of population and acceleration of global urbanization, the microbial contamination on textiles and continuous formaldehyde (HCHO) releases from indoor decoration have aroused public attentions along with the textile consumption. Herein, a green, novel method for preparation of a multifunctional cotton fabric was reported, via the combination use of mussel-inspired fabrication of amine-quinone networks (AQN) and in-situ deposition of manganese dioxide (MnO 2 ). Unlike the conventional methods under extreme conditions, in this method, the MnO 2 particles were efficiently deposited on the fiber surfaces at room temperature within 30 min in the presence of reductive AQN surface composed of polyethyleneimine (PEI) and dopamine, and the MnO 2 -deposited cotton fabric exhibits efficient photothermal antibacterial capability against both Staphylococcus aureus and Escherichia coli , with inactivation efficiencies over 97% after 20 min of irradiation. In addition, this multi-functional fabric shows prominent UV-shielding property (UPF > 100) and HCHO purification ability, making 106.04 μg of HCHO rapidly removed within 30 min by 2.5 g of modified cotton. Therefore, we believe that the functional fabric exhibits wide applications in the fields of home textiles for antibacterial and air purification under mild conditions, and the special AQN structure can be further expanded to fabrications of other multifunctional nano-composites.
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Journal of Cleaner Production
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2023
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IF 11.1
Xiunan Cai,Qingling Liu,Qing Yang,Fuzheng Fu,Yanjuan Zhang,Tao Gan,Huayu Hu,Zuqiang Huang
To effectively utilize the hazardous industrial solid waste manganese residue (MR), a MR-derived Fe 2 O 3 -baesd photocatalyst with efficient charge transfer, abundant reactive sites and high redox performance was developed for simultaneously removing organic pollutants and heavy metals . Herein, a novel “confined growth” strategy was proposed to fabricate an amorphous MnO 2 decorated α-Fe 2 O 3 @geopolymer sphere (A-MnO 2 /Fe 2 O 3 @GS) Z-scheme heterojunction by ion exchange method, which was used as a photo-Fenton catalyst for efficiently reducing Cr(VI) and degrading ciprofloxacin (CIP). Characterization results reveal that the 3D hydrangea-like MnO 2 with low crystallinity could not only capture and accelerate electron transfer but also act as an electron conduction bridge and a surface oxygen adsorption site, resulting in efficient separation and utilization of charge. More importantly, the photocatalytic reduction capacity was greatly enhanced in Z-scheme heterojunction owing to the lower conduction band potential of MnO 2 . A-MnO 2 /Fe 2 O 3 @GS showed excellent photocatalytic activity with CIP removal of 99.1% within 40 min and Cr(VI) removal of 97.6% within 50 min, which were 8.13 and 3.47 times higher than those catalyzed by Fe 2 O 3 @GS, respectively. This can be ascribed to the formation of intimate interface, internal electrostatic field , and rich structure defects in the Z-scheme heterojunction. This work offers a new idea to construct Z-scheme photocatalysts with high reactivity for environmental modification.
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FOOD CHEMISTRY
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2022
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IF 9.231
Bo Peng,Chunjuan Wang,Xueyan He,Yongjun Ma,Min Zhou,Xin Ma,Shengguo Zhao,Yanjun Fang
A triple-mode colorimetric and fluorescent sensing scheme based on manganese dioxide nanoparticles (MnO 2 NPs) and carbon quantum dots (CQDs) were developed to determine nitrite. MnO 2 NPs can oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) into a blue oxidation product (TMBox), which is further oxidized into a yellow diimine derivative by nitrite. The ratio of absorbance at 652 nm to 452 nm was monitored as signal response for UV–vis detection mode. A “turn-off” CQDs fluorescence probe was also constructed for fluorescent detection mode. Smartphone tool kit was used to capture the color of sample for smartphone-based measurement. Various analytical performance under different detection modes were obtained and compared. The proposed methods were applied to food samples with satisfactory recoveries (83.3–106 %). The results were validated with AOAC standard spectrophotometric method. The current triple-mode detection were accurate, convenient, low-cost and fast for analyzing nitrite in foods and water samples on-site.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Qing Zhang,Shangshang Ma,Li Zhang,Hongyan Wang,Xin Zhuo,Guizhi Wang,Yanyun Shen,Keying Zhang,Shao Su
Microfluidic chip for sensing heavy metal ions has been strongly attended due to its merits, but still remains a large challenge from long analysis time derived from the preconcentration process of metal ions. Herein, a heated flow channel was manufactured by 3D printing combined with a filter paper to construct a microfluidic chip, the thermocapillary convection strategy was introduced to accelerate ions migration, allowing for rapidly recognizing metal ions. The MnO 2 nanosheets-Au nanostars (MnO 2 NSs-AuNSs) film was employed as modifier to fabricate a flexible screen printed electrode (SPE) for high-efficiency detecting metal ions based on thermocapillary convection accelerating accumulation method. To verify the proposed strategy, the detection of Cu 2+ was chosen as a model. The results revealed that the proposed strategy possessed a rapid detection to Cu 2+ , which greatly improved the detection efficiency (saved 400 s of preconcentration time) and achieved a detection limit down to 0.0270 ppb. Interestingly, the constructed method was successfully used to evaluate Cu 2+ concentration in sweat samples with satisfactory results. This proposed method maybe provide new insight to develop a novel approach to rapidly and sensitively detect metal ions, which possess huge utilization potentiality for safeguarding human health.
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DIAMOND AND RELATED MATERIALS
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2022
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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.
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VACUUM
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2022
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IF 4.11
Peng Deng,Hua Fang,Rui Liu,Xueyong Guo,Pengwan Chen
The development of novel catalysts with high-activity to improve the thermal-induced pyrolysis of energetic molecular perovskite is of great importance. In this work, flower-like MnO 2 nanostructure was fabricated by a facile hydrothermal method with KMnO 4 as only precursor, and its thermal-induced pyrolysis performance of energetic molecular perovskite DAP-4 was studied. Results showed the catalysis thermal-induced pyrolysis peak temperature of DAP-4 had reduced by 50 °C from 386 °C (raw DAP-4) to 336 °C (DAP-4/10 wt% MnO 2 ) by the flower-like MnO 2 nanostructure , with rich oxygen vacancy added. The heat release of DAP-4 thermal-induced pyrolysis processes had a trend of increasing from 3423 J/g to 3563 J/g first and then decreasing to 2223 J/g. The apparent activation energy of DAP-4 had been reduced to 144 kJ/mol with addition of 10 wt% MnO 2 . The catalysis mechanism of MnO 2 with flower-like nanostructure on thermal-induced pyrolysis of DAP-4 was provided.
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FOOD CHEMISTRY
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2021
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IF 7.514
Xinfa Cai,Meijuan Liang,Fei Ma,Zhaowei Zhang,Xiaoqian Tang,Jun Jiang,Can Guo,Sherif Ramzy Mohamed,Amira Abdel Goda,Dawood H. Dawood,Li Yu,Peiwu Li
Lateral flow immunoassay (LFIA) is the most effective real-time detection method for aflatoxin B 1 (AFB 1 ). Here, we constructed a nanozyme-strip based on MnO 2 nanosheets (MnO 2 NSs) as a catalytic label for detection of AFB 1 . By taking advantage of the MnO 2 -TMB catalytic amplified system, the new test achieves rapid detection with high sensitivity and ultrawide range. The limit of detection of the assay was 15 pg mL −1 , which was over 100-fold lower than the maximum limit set by the European Union (EU) of AFB 1 in foods. In addition, the strip test could offer 7 dynamic detection ranges, spanning 4 orders of magnitude, which could cater to the varieties of limits on AFB 1 residues in foods and feeds set by different countries. The estimated recoveries were in the range of 85.67%-106.38% with coefficients of variations (CVs) less than 9.68%. Overall, the developed approach is a rapid, reliable, sensitive and widely available tool for on-site detection of AFB 1 .
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-10
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IF 5.833
Xing Yanyan,Chen Meiling,Zhao Yunkun,Xu Jiabi,Hou Xiaohong
Novel Fe 3 O 4 @C@MnO 2 composites were successfully synthesized for the first time via an interfacial reaction between magnetic porous carbon and KMnO 4 , in which the magnetic porous carbon was derived from the pyrolysis of Fe-MIL-88A under N 2 atmosphere. Interestingly, the obtained Fe 3 O 4 @C@MnO 2 composites were found to have triple-enzyme mimetic activity including peroxidase-like, catalase-like, and oxidase-like activity. As a peroxidase mimic, Fe 3 O 4 @C@MnO 2 composites could catalyze the oxidation of TMB into a blue oxidized product by H 2 O 2 . As a catalase mimic, Fe 3 O 4 @C@MnO 2 could catalyze the decomposition of H 2 O 2 to generate O 2 and H 2 O. As an oxidase mimic, Fe 3 O 4 @C@MnO 2 could catalyze the direct oxidation of TMB to produce a blue oxidized product without H 2 O 2 . Reactive oxygen species measurements revealed that the oxidase-like activity originated from 1 O 2 and O 2 − ∙and little∙OH generated by the dissolved oxygen, which was catalyzed by the Fe 3 O 4 @C@MnO 2 in the TMB oxidation reaction. The oxidase-like activity of Fe 3 O 4 @C@MnO 2 was investigated in detail. Under the optimized conditions, a rapid, sensitive, visual colorimetric method for dopamine detection was developed based on the inhibitory effect of dopamine on the oxidase-like activity. The proposed method allows for dopamine detection with a limit of detection of 0.034 μM and a linear range of 0.125–10 μM. This new colorimetric method was successfully used for the determination of dopamine in human blood samples. Graphical abstract
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 10
·1-10
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IF 5.833
Xu Shengrui,Dong Panlong,Qin Ming,Liu Hailin,Long Anying,Chen Changpo,Feng Suling,Wu Hongjing
Core-shell structured Fe 2 O 3 /CeO 2 @MnO 2 microspheres were fabricated and used as solid-phase microextraction coating for determination of polycyclic aromatic hydrocarbons (PAHs) in water samples. XPS spectra demonstrated the generation of abundant surface oxygen on Fe 2 O 3 /CeO 2 @MnO 2 microspheres, which provided binding sites for enhancement of analyte extraction. Under optimized conditions, the proposed method presented good linearity in the concentration range 0.04–100 ng mL −1 , with low limits of detection varying from 0.38 to 3.57 ng L −1 for eight PAHs. Relative standard deviations for a single fiber and five batches of fibers were in the ranges of 4.1–8.2% and 7.1–11.4%, respectively. The proposed method was successfully used for determination of PAHs in real river water samples with recoveries ranging from 87.1 to 115.9%. The proposed method using as-prepared Fe 2 O 3 /CeO 2 @MnO 2 microspheres as SPME coating exhibit significant potential for real sample analysis due to its excellent reproducibility, high sensitivity, and good linearity. Graphical abstract
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NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 46
·期 3
·1120-1126
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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.
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ANALYTICA CHIMICA ACTA
·
2021
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IF 6.558
Fang Liu,Tiantian Lei,Yingli Zhang,Yaping Wang,Yu He
In this work, boron carbon oxynitride quantum dots (BCNO QDs) were prepared by a one-step hydrothermal process of ethanolamine and boric acid . BCNO QDs exhibited blue fluorescence with the optimal excitation/emission fluorescence peak at 335 and 420 nm, respectively. As an efficient fluorescence quencher , manganese dioxide (MnO 2 ) nanosheets can effectively quench the fluorescence of BCNO QDs via the inner filter effect (IFE). Acetylcholinesterase (AChE) catalyzes the hydrolysis of acetylcholine (ATCh) to produce thiocholine (TCh). TCh can reductively degrade MnO 2 nanosheets to generate Mn 2+ , thereby recovering the fluorescence of BCNO QDs. Organophosphorus pesticides (OPs) can inhibit the activity of AChE enzymes , thereby preventing the production of TCh and the decomposition of MnO 2 nanosheets, resulting in the fluorescence “turn-off”. Therefore, the concentration of OPs can be detected by measuring the fluorescence intensity change of AChE-ATCh-MnO 2 -BCNO-QDs system. Under optimal experimental conditions, the dynamic detection range of paraoxon is 0.1–250 ng mL −1 , and the detection limit is 0.03 ng mL −1 . Meanwhile, the reaction system also showed concentration-dependent visual color changes from colorless to brownish. Furthermore, we prepared a portable BCNO QDs test paper. By using a smartphone to identify the RGB values of the reaction solution and the corresponding test paper, we carried out the digital image chromaticity analysis, which can shorten the detection time and reduce the detection cost, and provide an effective solution for the rapid detection of OPs on site.
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