APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Chong Jia,Ying Wu,Lijie Xu,Shuguang Han,Lu Gan
Herein, binary composite catalysts based on MnO 2 and CoFe 2 O 4 were prepared to degrade bisphenol A (BPA) and dimethyl phthalate (DMP) by coupling with peroxymonosulfate (PMS), in which CoFe 2 O 4 was located either at the outer (MnO 2 @CoFe 2 O 4 ) or at the inner (CoFe 2 O 4 @MnO 2 ) positioning. The catalysts possessed higher degradation efficiency than both pristine CoFe 2 O 4 and MnO 2 , in which MnO 2 @CoFe 2 O 4 provided the highest PMS activation capability. The positioning of each component influenced significantly the variety and intensity of the generated reactive oxidative species, in which MnO 2 @CoFe 2 O 4 generated more hydroxyl radical ( OH) whereas CoFe 2 O 4 @MnO 2 generated more non-radical singlet oxygen ( 1 O 2 ). Therefore, MnO 2 @CoFe 2 O 4 could degrade both BPA and DMP with high degradation rate, while CoFe 2 O 4 @MnO 2 only exhibited promising degradation efficiency towards BPA since DMP was inert to 1 O 2 . Comparatively, CoFe 2 O 4 @MnO 2 had better catalytic stability and water matrix adaptability than MnO 2 @CoFe 2 O 4 when degrading BPA, since OH was vulnerable water with complicated compositions. This study provides a new insight for the design and selection of composite catalyst towards the degradation of organic pollutants with discrepant structures and properties.
研究领域:
环境科学
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催化化学
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污染治理
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jie Jin,Yang Bao,Feihu Li
Integrating MnO2 with carbon is a reliable strategy to improve capacitive deionization (CDI) performance by leveraging the unique properties of both components (i.e., MnO2 and carbon). However, the influences of preliminary functionalization of carbon (e.g., nitrogen doping, KOH activation) and pairing of cathodes and anodes on the CDI performance have yet to be systematically explored. Herein, we prepared a group of MnO2-decorated mesoporous carbon composites with nitrogen as a dopant (i.e., MK-NMCS, K-NMCS, NMCS, and CS), and systematically evaluated the desalination performance of various cathode//anode pairs in a hybrid capacitive deionization (HCDI) for capturing Na+, Cu2+, and Pb2+, respectively. Of all electrodes, the MK-NMCS//K-NMCS pair demonstrates the optimum desalination performance based on salt adsorption capacity (SAC) and cycling stability, offering a SAC of 25.4 mg g–1 and a SAC retention of 102.4% after 50 consecutive charge–discharge cycles at 1.2 V in 500 ppm of NaCl solution. In addition, the MK-NMCS//K-NMCS electrodes also show the maximum ion adsorption capacity (IAC) toward Cu2+ and Pb2+ ions compared to other cathode//anode pairs, attaining an IAC of 37.0 and 30.0 mg Cu2+ per gram electrode materials at 1.2 V in 500 and 200 ppm of Cu2+ solutions, respectively (cf. 32.2 mg of Pb2+ per gram of electrode materials in 200 ppm of Pb2+ solution). Besides, these electrodes exhibit excellent cycling stability when applied in removing each heavy metal ion separately, with IAC retentions of 90.0 and 98.5% after 50 cycles toward Cu2+ and Pb2+ ions, respectively. Mechanical analysis reveals that both heavy metals are likely to be sequestered via capacitive electrosorption by carbon, intercalation with MnO2, and surface complexation at the external surface of the [MnO6] octahedral layers. Our results demonstrated a great potential of the MnO2-decorated N-doped carbon//prefunctionalized carbon pairs, in particular, the MK-NMCS//K-NMCS electrode pair for capturing heavy metal ions via HCDI platforms. Such prefunctionalization and pairing strategies are very promising for screening high-performance composite electrodes for wastewater remediation.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Wanying Fu,Hongying Wang,Yanwei Chen,Jinglei Ding,Guiye Shan
In this work, a gold nanocluster with lysine (Lys) as a ligand was fabricated, and a novel nanocomposite probe (AuNCs@Lys-MnO 2 ) was prepared based on fluorescence resonance energy transfer (FRET). AuNCs@Lys-MnO 2 was manufactured for sensitive and rapid sensing of glutathione (GSH) in human serum. Gold nanoclusters (AuNCs@Lys) and manganese dioxide nanosheets (MnO 2 nanosheets) are combined by electrostatic interaction. MnO 2 nanosheets can quickly quench the fluorescence of AuNCs@Lys through FRET. GSH has strong reducing ability, which can reduce MnO 2 and degrade AuNCs@Lys-MnO 2 FRET system. The presence of GSH subsequently releases AuNCs@Lys, which causes partial recovery of fluorescent signal. The nanocomposite probe is successfully applied to detect GSH in human serum. Detection range is near the normal value in human serum, and there is no need to dilute the serum during the detection process. This is a fast, simple, and cost-effective strategy. The method can detect GSH in the concentration range of 0.5 to 1000 μM, and has a very high sensitivity, the detection limit is as low as 5 nM.
研究领域:
分析化学
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纳米技术
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生物传感器
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生物医学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Weipan Peng,Shenghui Li,Yating zhang,Qiuting Zhang,Wenna Li,Houyu Han,Dianming Zhou,Sheng Wang,Jin Chang,Xiaoqun Gong
Tumors progression is usually characterized by proliferation, migration, and angiogenesis , and it leads to uncontrolled tissue growth and blocks the mechanism of apoptosis. Therefore, targeted angiogenesis and anti-apoptosis is considered promising therapeutic strategy for cancer prevention and treatment. Herein, we report a versatile and intelligent MnO 2 -PEI-DNAzymes (MnPDs) nanodevice for self-sufficient anti-tumor angiogenesis and pro-apoptosis synergistic gene silencing, coupling multi-target bimodal in situ imaging. Intracellularly, the multifunctional charge-reversal MnPDs undergo reduction and lysis by the overexpressed GSH, actualizing enhanced MR imaging and sufficient DNAzyme cofactors in tumor tissue, and enabling miRNA-155 and telomerase biomarkers dual-fluorescence imaging. Under the precise multimodal imaging, the dual DNAzymes enable self-sufficient Early growth response-1 (EGR1) and Survivin (SUR) mRNAs synergistic silencing, effectively inhibiting tumor angiogenesis and anti-apoptotic. Considering that accurate and efficient therapy has become a trend in cancer therapy, our proposed self-sustaining multifunctional nanodevice is promising for broad clinical applications.
研究领域:
癌症生物学
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纳米技术
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基因治疗
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分子成像
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Zhuo-Rui Jiang,Yuxin Li,Yu-Xiao Zhou,Xiaoyu Liu,Changhua Wang,Yeqing Lan,Ying Li
Co 3 O 4 -MnO 2 /BC, as an efficient activator of peroxymonosulfate (PMS) for the decomposition of soluble sulfonamide antibiotics, was successfully obtained via anchoring Co 3 O 4 -MnO 2 nanoparticles on rice straw biochar (BC). The results demonstrated that 25 mg/L sulfadiazine (SDZ) could be thoroughly destructed by a combination of PMS (1 mM) and Co 3 O 4 -MnO 2 /BC (0.1 g/L) within 10 min. The pseudo-first-order rate constant ( k ) of the SDZ degradation was high up to 0.482 min −1 , which was much larger than those reported in previous literature. The superior stability of the catalyst was confirmed through 5 recycle runs with approximately 100% degradation of SDZ and less than < 0.7 mg/L leached metal ions. Singlet oxygen ( 1 O 2 ) and sulfate radicals (SO 4 •− ) were proved to be the principal reactive oxygen species (ROS) responsible for the degradation of SDZ. Combining the identification of ROS as well as intermediates during the SDZ degradation process, the possible catalytic mechanisms and the pathways of the SDZ degradation were deduced. The results further demonstrated that the combination of Co 3 O 4 -MnO 2 /BC and PMS also possessed a universal degradation capacity towards other typical organic pollutants, such as sulfisoxazole, sulfamethoxazole, bisphenol A and phenacetin. This is the first report on high-efficient heterogeneous activating PMS by Co 3 O 4 -MnO 2 /BC to eliminate soluble sulfonamide antibiotics, which makes it valuable for developing eco-friendly and efficient catalysts for the PMS activation.
研究领域:
环境科学
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催化
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水处理
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Yuan Zhang,Weina Meng,Xiao Li,Dong Wang,Shaomin Shuang,Chuan Dong
Development of multifunctional enzymatic nanomaterials with rapid and sensitive characteristics for glutathione determination is extremely urgent for early cancer diagnosis. Herein, a core–shell ultrasensitive nanozyme (denoted as CPT/DM-FA) for triple-mode glutathione sensing and specific in vitro cancer detection is constructed. The dendritic mesoporous silica nanoparticle (DMSN) core not only acts as a camptothecin carrier, but also offers the nanoplatform to synthesize the MnO2 shell. Due to the DMSN-regulated high dispersion of MnO2, the atomic utilization efficiency of MnO2 is surprisingly enhanced, and leads to notable enzymatic activity with Km 0.136 μM and Vmax 0.59 μM/s. In addition, by integrating the quenching ability based on fluorescence resonance energy transfer and oxidase-mimic-mediated 1O2, O2– generation of MnO2, the fluorescence, UV–vis, and colorimetric method for glutathione sensing is established with a comprehensive linear range from 2 to 250 μM and a limit of detection of 0.654 μM. Besides, after surface folic acid modification, the CPT/DM-FA could also specifically detect cancer cells from 25 to 1 50 000 through the color reaction of 3,3′,5,5′-tetramethylbenzidine. We believe this nanozyme could afford a potential strategy to amplify the nanozyme activity for further biomedical applications.
研究领域:
纳米技术
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生物医学工程
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分析化学
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癌症诊断
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材料科学
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产品关联
DOI
高影响因子
ANALYST
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2021
·Vol. 146
·期 16
·5115-5123
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IF 4.616
Haiyang Yao,Difei Jiang,Gaoqiu Dong,Jiamin Sun,Shasha Sun,Lingling Li,Fenfen Zheng,Weiwei Xiong
Dynamically monitoring intracellular glutathione (GSH), a crucial biomarker of oxidative stress, is of significance for the diagnosis and treatment of certain diseases. Although manganese dioxide (MnO2) based GSH fluorescent sensors have exhibited high sensitivity and good selectivity owing to the specific reactivity between GSH and MnO2, near-infrared (NIR) MnO2 based nanoprobes for GSH detection are scarce. Herein, we have developed a NIR activatable fluorescence nanoprobe for the imaging and determination of intracellular GSH based on a core–shell nanoparticle, consisting of NIR emitted gold nanocluster doped silica as the fluorescent core and manganese dioxide as the GSH-responsive shell (named AuNCs@MnO2). Due to the absorption competition mechanism, the outer MnO2 shell rather than the inner AuNCs core preferentially absorbed the excitation light, thus leading to fluorescence quenching of the inner AuNCs core. Upon addition of GSH, the fluorescence of the nanoprobe restored along with the reduction of MnO2 to Mn2+ because of the absorption competition disappearance-induced emission. The activatable fluorescence linearly increased upon changing the GSH concentration in the range of 2 to 5000 μM with a detection limit of 0.67 μM. The cytotoxicity test shows that the AuNCs@MnO2 nanoprobes have a good biocompatibility. After entering the cancer cells, the intracellular GSH degraded the outermost MnO2 shell and initiated the NIR fluorescence restoration of AuNCs, which can be used to monitor the dynamic change of intracellular GSH. This strategy provides an NIR-activatable way to detect GSH levels in living cells and offers a promising platform for the diagnosis and treatment of GSH-related diseases.
研究领域:
生物医学工程
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纳米技术
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分析化学
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细胞生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Xingjian Dai,Jinsong Rao,Zhihao Bao,Kailin Li,Li Feng,Dan Song,Li Zhao,Wei Li,Xiaoying Liu,Shuang Yi,Pan Dong,Yuxin Zhang
Design and fabrication of core–shell nanomaterials with excellent properties such as multifunctionality, tunability, and stability for the removal of recalcitrant pollutants from wastewater is highly valued. In this work, magnetic MnO 2 @NiFe@DE nanocomposites with double-core@shell structures were obtained via a two-step hydrothermal method for efficiently removing tetracycline, anionic and cationic dyes through the synergistic effect of oxidation and adsorption. The novel nanomaterial displayed superior removal of methyl orange, methylene blue, and tetracycline in low pH solutions with 100%, 100%, and 83%, respectively. The effects of solution pH, adsorption time, and contaminant concentration on the performance of the nanocomposite were also investigated, and the pseudo-second-order kinetic model well described the data. Physical adsorption including electrostatic adsorption, anion exchange, and hydrogen bonding are the predominant mechanisms for contaminant removal. The oxidation mechanism is mainly hydroxyl radical action. Through the use of permanent magnets, the recovery process of the adsorbent and the adsorbed dyes and antibiotics is energetically and economically sustainable. This as-synthesized nanocomposite as multifunction material has a high removal rate, low cost, and easy separation, and the applicability in treating the solutions with low pH, which is promised to be an efficient organic wastewater remover in practical applications.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Shuqi He,Yaozhi Liu,Hong Wu,Wenjun Zhao,Zhiqing Xue,Yue Zhang,Sibo Wang,Jing Wang,Xiao-Xia Liu,Xiaoqi Sun
Rechargeable aqueous Zn-MnO 2 batteries are promising for large-scale energy storage. A two-electron transfer reaction of MnO 2 /Mn 2+ is available for the cathode, delivering a high theoretical capacity of 616 mAh g −1 . However, this process requires protons, and its practical contribution in conventional mildly acidic zinc batteries is limited. Herein, an organic redox mediator of Tiron is demonstrated to realize dominant two-electron transfer energy storage in MnO 2 cathode materials. The reversible hydroquinone/benzoquinone redox couple of Tiron allows facile spontaneous chemical reaction with MnO 2 to generate Mn 2+ as well as electrochemical redox in zinc cells according to combined in situ/ex situ analysis. Theoretical calculations further reveal that Tiron reduces the energy required for Mn release from the MnO 2 lattice. Therefore, Tiron not only boosts the two-electron reaction of MnO 2 but also reactivates any dead materials. Thanks to these effects, the MnO 2 cathode achieves a high capacity of 525 mAh g −1 at 0.3 A g −1 , far exceeding 384 mAh g −1 in the baseline system. The lifespan also extends four times to 12 000 cycles at 5 A g −1 together with stable capacity retention. This work presents an effective strategy to encourage the high-capacity reaction path of MnO 2 cathodes in aqueous zinc batteries.
研究领域:
储能
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电化学
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材料科学
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电池技术
✓ 已验证
产品关联
DOI
高影响因子
Foods
·
2024
·Vol. 13
·期 13
·2009
·
IF 4.7
Guifang Xie,Fujing Mao,Yirui Huang,Li Wen,Zhichang Sun,Zhenyun He,Xing Liu
Deoxynivalenol (DON) is a common mycotoxin that contaminates cereals. Therefore, the development of sensitive and efficient detection methods for DON is essential to guarantee food safety and human health. In this study, an enzyme cascade amplification-based immunoassay (ECAIA) using a dual-functional alkaline phosphatase-linked single-chain fragment variable fusion tracer (scFv-ALP) and MnO2nanosheets was established for DON detection. The scFv-ALP effectively catalyzes the hydrolysis of ascorbyl-2-phosphate (AAP) to produce ascorbic acid (AA). This AA subsequently interacts with MnO2nanosheets to initiate a redox reaction that results in the loss of oxidizing properties of MnO2. In the absence of ALP, MnO2nanosheets can oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to produce the blue oxidized product of TMB, which exhibits a signal at a wavelength of 650 nm for quantitative analysis. After optimization, the ECAIA had a limit of detection of 0.45 ng/mL and a linear range of 1.2–35.41 ng/mL. The ECAIA exhibited good accuracy in recovery experiments and high selectivity for DON. Moreover, the detection results of the actual corn samples correlated well with those from high-performance liquid chromatography. Overall, the proposed ECAIA based on the scFv-ALP and MnO2nanosheets was demonstrated as a reliable tool for the detection of DON in corn samples.
研究领域:
食品安全
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分析化学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
·
2019
·
IF 1.584
Huabo Huang,Renpeng Chen,Shuaiyi Yang,Liang Li,Yulan Liu,Juan Huang
To obtain the promising pseudocapacitance of MnO2, the composite hydrogel of MnO2 and polyaniline (PANI) was fabricated using in situ polymerization of aniline hydrochloride in the aqueous solution containing commercial MnO2 nanoparticles and additives. Both scanning electron microscopy and transmission electron microscopy results indicated that the composite hydrogel exhibited a 3-D porous structure, within which MnO2 nanoparticles were uniformly embedded. The investigations of cyclic voltammetry, galvanostatic charge−discharge, and electrochemical impedance spectroscopy demonstrated superior supercapacitor (SC) performance of the hydrogel electrode even with high loading. The electrode with loading of 1.5 mg cm–2 showed a favorable specific capacitance (293 F g–1, 10 mV s–1), which only decreased to 258 F g–1 when the loading of the electrode was seven times higher (10.8 mg cm–2). Furthermore, the hydrogel electrode displayed good cycle stability in the acidic solution (81% capacitance retention after 1000 charge/discharge cycles). The favorable electrochemical performance of the composite hydrogel should be attributed to the fast electron/ion transport and good protection for MnO2 in the 3-D porous structure. Due to the facile one-pot synthesis and optimized nanostructure, it could be expected that MnO2-embedded 3-D porous PANI composite hydrogels have great application in the field of high-performance electrode with high loading for SCs.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2021
·
IF 1.134
Ting-Hua LI,Su-Qing SHI,Xue-Song LU,Lu-Lu SHI,Shan-Shan WEI,Hui GUO,Xin-Yu ZHANG,Hong-Yuan ZHANG,Guo-Ying SUN
Versatile nano-theranostic agents are highly desirable for the precision nanomedicine of tumors in recent years. In this work, a multifunctional diagnostic and therapeutic agent Bi 2 S 3 -MnO 2 @BSA-Ce6 (BMBC) was successfully prepared by a combination strategy of facile chemical coupling and biomineralization under mild conditions. These BMBC nanoparticles with an average diameter of 17.6 ± 4.6 nm exhibited favorable physiological stability and negligible toxicity. This agent expressed outstanding performance of photothermal conversion (η = 45.8%) under 808 nm laser radiation and generation of 1 O 2 under 650 nm laser irradiation. Due to the strong X-ray attenuation performance of element Bi and the highly effective magnetic moment of Mn 2+ , this agent exhibited favorable performance of X-ray computed tomography (CT) imaging (35.60 HU•mL•mg −1 ) and magnetic resonance (MR) imaging (r 1 = 5.22 mM −1 •s −1 ) in vitro. Furthermore, most of the HeLa cells treated with BMBC NPs were dead in the MTT and Calcein-AM/PI staining experiments, demonstrating the excellent effect of intracellular synergistic therapy. Overall, this theranostic agent could serve as a promising nano-platform for photothermal/photodynamic synergistic therapy of tumors under the guidance of infrared thermal (IRT)/MR/CT imaging.
研究领域:
纳米医学
·
癌症治疗
·
医学影像
·
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）