Catalysis Science & Technology
·
2019
·Vol. 9
·期 18
·5090-5099
·
IF 5.726
Yi Yu,Shuilian Liu,Jian Ji,Haibao Huang
Ozone pollution has aroused worldwide concern for its adverse impact on both the environment and human health. A series of MnO2 catalysts with different crystallinities were prepared for ozone decomposition. The crystallinity of MnO2 was regulated by varying the calcination temperature of an amorphous MnO2. The calcination temperature was confirmed oddly to have a significant effect on the morphology, the textural properties and the surface chemistry of manganese oxides. Both the pristine amorphous MnO2 and the one calcined at 300 °C (MnO2-300) exhibited superior catalytic activity for ozone decomposition owing to the abundant surface oxygen vacancies, large specific surface area, and high oxygen mobility, which were derived from the amorphous structure. FTIR and in situ DRIFTS experiments revealed that calcination generated the hydrophobic MnO2-300, which showed enhanced water resistant ability compared with the pristine amorphous MnO2, and significantly suspended catalyst deactivation. Moreover, the oxidation state of Mn slightly changed in the used MnO2-300, further maintaining the high activity. This work may broaden the horizons of designing catalysts with high stability and efficiency for ozone decomposition.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2026
·
IF 6.5
Xiaoxue Sun,Jiawei Yang,Zhen Shen,Linghao Wu,Haifei Xu,Guojun Ma,Ning Han,Yunfa Chen
Amorphous MnO 2 /MnC 2 O 4 heterostructures was constructed. • MnO 2 -2 possesses abundant oxygen vacancies, heterointerfaces, and a large surface area. • The MnO 2 -2 achieved 94 % O 3 removal at a high WHSV of 1,440,000 mL/(g·h) with cycling durability over five cycles. • The heterostructures facilitate rapid electron transfer and relieve the accumulation of deactivating intermediate oxygen species. • The strategy reduced wastewater by 67 % and enhanced space-time yield by 37 %. Constructing synergistic active sites in manganese dioxide (MnO 2 ) catalysts has attracted increasing attention as an effective strategy to improve ozone decomposition. Herein, we report a composite structure of amorphous MnO 2 /MnC 2 O 4 heterostructures as an efficient synergistic catalyst for ozone decomposition. Structural and surface analyses reveal the formation of a multiphase composite featuring high-density oxygen vacancies, abundant heterointerfaces, and a large specific surface area. In situ diffuse reflectance Fourier transform infrared ( in situ DRIFT) spectroscopy reveals a synergistic mechanism: amorphous MnO 2 promotes ozone adsorption and activation, while the heterointerface accelerates electron transfer to prevent the accumulation of deactivating oxygen species. Benefiting from this synergy, the catalyst achieves 94 % conversion under an ultra-high weight hourly space velocity (WHSV) of 1,440,000 mL/(g·h). It also demonstrates excellent performance in different scenarios, including high ozone concentrations (1000 ppmV), humidity resistance (65 % RH), cycling durability (5 cycles), and long-term stability (20 h). Furthermore, the monolithic catalyst maintains high efficiency for over 24 h. This work not only provides an effective room-temperature strategy for synthesizing active MnO 2 -based catalysts but also significantly alleviates the poisoning effect of adsorbed impurity ions on active sites, demonstrating great potential for practical application. Download: Download high-res image (629KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Laibo Song,Yunchao Hu,Hengjie Liu,Zhen Jin,Jinlong Chang,Wenlong Zhang,Xianglong Zhu,Lanqi Jia,Wu Ren,Yi Yu
An interface-driven antibacterial platform is built using spiky MnO 2 microparticles. • Topology-associated mechano-bactericidal effects are combined with nanozyme activity. • The platform inactivates bacteria, inhibits biofilm formation, and partially disrupts mature biofilms. Bacterial infections, particularly those associated with biofilms, remain difficult to treat because bacteria are protected by the extracellular polymeric matrix and the local microenvironment. In this work, we developed spiky manganese dioxide (SP-MnO 2 ) microparticles serving as an interface-driven mechanochemical antibacterial platform combining topology-associated interactions with nanozyme activity. The spiky morphology facilitated bacterial capture and promoted close contact between bacteria and material, providing a structural basis for mechano-bactericidal interactions. At the same time, MnO 2 consumed glutathione and promoted reactive oxygen species generation through its nanozyme activity, thereby weakening antioxidant buffering and inducing oxidative damage near bacterial surfaces. Through this combined mechanochemical action, SP-MnO 2 achieved >97% antibacterial efficiency against planktonic bacteria, inhibited biofilm formation, and partially disrupted mature biofilms in vitro . Mechanistic comparisons further showed that the spiky morphology made a substantial contribution to the antibacterial activity by promoting bacteria-material interactions and localized oxidative damage. SP-MnO 2 also exhibited acceptable short-term cytocompatibility and hemocompatibility. Overall, this work introduces a proof-of-concept antibacterial platform and provides a rational strategy for enhancing antibacterial activity through morphology-regulated bacteria-material interfaces. An interface-driven mechanochemical antibacterial platform based on spiky MnO 2 microparticles combines topology-associated mechano-bactericidal effects with MnO 2 nanozyme activity. Download: Download high-res image (190KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
Results in Chemistry
·
2025
·
IF 4.2
JianGuo Huang,Rashid Khan,Chunhui Zhai,Xianting Ding,Li-Sha Zhang,Jin-Ming Wu,Zhizhen Ye
The development of efficient disinfection techniques that can persistently eradicate viruses or disrupt their transmission is of paramount significance for curbing the spread of pandemics. Existing disinfection techniques commonly suffer from secondary pollution and difficulty in achieving continuous disinfection while ensuring safety and effectiveness, particularly in crowded environments. In this study, we adopted ozone synergistic catalytic oxidation (OSCO) technology for the highly efficient disinfection of bacteria and viruses. The OSCO route is based on the catalytic decomposition of ozone into active radicals in the presence of an optimized rod-like Cu/MnO 2 catalyst. The high catalytic activity of the Cu-doped MnO 2 catalyst can be attributed to the presence of numerous oxygen vacancies, which facilitate the catalytic decomposition of ozone into active radicals. This method serves multiple purposes, including the eradication of bacteria and viruses as well as the prompt decomposition of ozone to prevent any potential leakage. A disinfection rate of 99.9 % for both Staphylococcus albicans and H1N1 viruses was achieved within 20 min. The catalyst also demonstrated exceptional efficiency in degrading residual ozone, achieving a high removal rate of 99.99 % within 25 min, thus assuring safe disinfection. Density functional theory (DFT) calculations further supported that Cu doping induced lattice defects in MnO 2 , promoting the formation of interfacial oxygen vacancies and in turn favoring the catalytic oxidation process. The current OSCO technology offers a highly efficient and secure disinfection method with a wide range of potential applications in various fields.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 12
·1-14
·
IF 3.8
Xing Yonglei,Liu Huijuan,Ha Yu,Jin Xiaoyong,Kou Beibei,Yang Rui,Ni Gang
MnO 2 /CoMoO 4 / NF (Nickel foam) was obtained by loading MnO 2 onto the surface of CoMoO 4 /NF using electrodeposition. The results of degradation experiments showed that the degradation efficiency of levofloxacin (LVF) (15 ppm, pH = 6.12) over MnO 2 /CoMoO 4 //NF reached 80.4% in 30 min when the PMS concentration was 0.08 mM. When the pH was lower or higher than the pH value of the original solution, the performance of the material significantly decreased due to the repulsive effect between the catalyst and SO 5 2− . Cobalt and manganese ions exhibited a synergistic effect on the activation of PMS. The HCO 3 − ions showed the most significant inhibitory effect on the degradation of LVF. The free radical trapping experiments indicated that ·OH, and O 2 · − were the main active species in the degradation process of levofloxacin. The cyclic stability experiments proved the MnO 2 /CoMoO 4 /NF catalysts were efficient, stable and easy to recover. Graphical
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
Science China-Materials
·
2024
·
IF 6.8
Ge Dejie,Ren Debao,Duan Yamin,Luo Xuan,He Shuailin,Qin Wenjun,Wang Fei,Yin Wen,Ma Lixin,Yang Yong,Zhang Cheng
The inherent tumor microenvironment (TME) of hypoxia and high glutathione (GSH) hinders the production of reactive oxygen species (ROS), yet which are crucial roles to make the oxygen-independent chemodynamic therapy (CDT) outstanding. Herein, we constructed hyaluronic acid (HA)-modified and peroxymonosulfate (PMS)-loaded hollow manganese dioxide (HMn) nanoparticles for not only TME-response drug release but also the distinct ROS donors to strengthen CDT. Upon enriched in the tumor site, the prepared nanotheranostic agent (HA@HMn/PMS) depleted local GSH to reduce MnO 2 to Mn 2+ , followed by generating •OH and •SO 4 − through Fenton-like reaction and activation of PMS, respectively. The bring in of •SO 4 − , a rare radical possessing exceptional oxidizing ability and oxygen-independent property, breaks the limitations of traditional ROS and causes serious damage to tumor cells. In a xenograft mouse tumor model, detailed studies demonstrated that HA@HMn/PMS can significantly inhibit tumor growth. This work inspires the enormous potential of CDT in investigating the application of multifunctional nanosystems by combining the consumption of GSH and the synergistic effect of multiple radicals in oncotherapy.
研究领域:
生物医学工程
·
纳米医学
·
肿瘤治疗学
✓ 已验证
产品关联
DOI
高影响因子
Nanomedicine-Nanotechnology Biology and Medicine
·
2021
·
IF 6.458
Song-Bin Yang,Xiao-Liu Li,Kai Li,Xin-Xin Zhang,Mei Yuan,Yi-Sha Guo,Xia Bi
Stroke is one of the most serious problems that seriously affect people's health and brings huge economic burden to society. The development of new nanocarriers with desired degradability and targeted ability is of great significance for efficient drug delivery. In recent years, nano drug delivery system has developed rapidly and applied to treat ischemic stroke . Here, we report the synthesis and functionalization of monodisperse hollow structured MnO 2 (H-MnO 2 ). The highly monodisperse H-MnO 2 with uniform morphology was obtained by in situ growing MnO 2 on solid silica nanoparticles and subsequently removing the silica core. After successive modification of poly ethylene glycol(PEG), we further verified their protective effect on ischemic stroke in our study.
研究领域:
医学
·
生物材料学
·
神经科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Lingxiao Fu,Xiaofeng Wu,Yongbin Zhu,Lei Yao,Chengqiang Wu,Haixiang Cheng,Yiran Xu,Jun Hu,Weijun Gao
Manganese dioxide (MnO 2 ) is a Mn deposit widely accumulated in the corrosion layer of pipelines, and iodide (I − ) is a halogen ion frequently detected in waters. The biofilm dwelling on the corrosion scales often secretes extracellular polymeric substances (EPS) into drinking water . The paper aimed to study the I − oxidation by MnO 2 and iodinated disinfection byproducts (I-DBPs) formation with biofilm EPS as a precursor. More than 93% of formed free iodine was finally converted into organic iodine in the MnO 2 /I − /EPS system. Compared with humic acid , EPS had a lower carbonaceous I-DBPs (C-IDBPs) formation while a higher nitrogenous I-DBPs (N-IDBPs) formation. The formation of iodomethanes (I-THMs), iodoacetonitriles (I-HANs) and iodoacetic acids (I-HAAs) decreased with the increase of pH due to the weakening of polarization effect and redox potential , while the iodoacetamides (I-HAcAms) formation achieved the maximum at pH 6.0 due to the difference between the hydrolysis rate of I-HANs and decomposition rate of I-HAcAms. The I-DBPs formation was positively correlated with I − concentration, while negatively correlated with MnO 2 dose. Protein components displayed a higher formation of N-IDBPs and C-IDBPs than polysaccharide components due to higher nitrogen proportion and more iodination sites. Among 20 protein monomers , aspartic acid was considered as the most important precursor of the four investigated I-DBPs species. The paper is helpful to understand the I-DBPs formation when I − in the bulk water come into contact with Mn deposits attached by biofilm.
研究领域:
环境科学
·
水处理
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 2
·381-386
·
IF 3.069
Qi Wang,Xulu Ma,Houhua Lv,Awen Wei,Tingxuan Wu,Lifeng Ding,Xiang Ma,Chunlei Ma
Ascorbic acid (AA) is an esstential micronutrient in the human body and participates in vital processes. It can only be supplemented by external intake, making the determination of AA in food or beverages of significance. In the present work, MnO2 nanoparticle (MnO2 NP) based turn-off colorimetry was established for AA determination on the basis of AA-stimulated inhibition of catalytic oxidation. MnO2 NPs were synthesized through a biotemplating method and displayed effective catalytic oxidation activity for oxidation of TMB, triggering a chromogenic reaction. Interestingly, the introduction of AA induced the decomposition of MnO2 NPs and as a consequence decreased the colour. Therefore, sensitive and selective turn-off colorimetry for AA detection was established and a satisfactory linear range of 0.5–30 μM with a detection limit of 0.28 μM was obtained. This MnO2 NP-based method was activated via a novel sensing principle, complementing and facilitating colorimetry for AA.
研究领域:
分析化学
·
纳米技术
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2018
·
IF 0
Dao Yan Feng,Yu Xiao Li,Hui Yang,Xing Zhong Guo
Hierarchical porous SiO2@C@MnO2 monoliths have been fabricated by two step approaches: Elemental carbon was covered the internal surface of porous silica monoliths with impregnation and carbonized in inert atmosphere, and MnO2 was directly grown on the skeleton of SiO2@C accompanied by redox reaction between C and KMnO4. The effects of glucose and KMnO4 concentrations, and hydrothermal reaction on the morphology of MnO2 particles on the surface of SiO2 monoliths were investigated in detail. The results showed that the optimal factors of reaction condition involved 0.08 mol·L-1 glucose solution, 0.03 mol·L-1 KMnO4 solution and the reaction time of 5 h. SEM images and BET results indicated that the macroporous structure of the as-prepared material was preserved after modification, while the specific surface area and pore volume decreased with increasing amount of MnO2 to some degree. The XPS spectra of SiO2@C@MnO2 is in good agreement with reported data in MnO2. The crystal phase of MnO2 was α-MnO2 after thermal treatment at the temperature of 600 °C from the XRD patterns. Three-dimensional porous well-defined morphological SiO2@C@MnO2 be promising materials for the catalytic elimination of air pollutants since large quantities can be obtained from porous structure combined with α-MnO2 equipped with high active performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
Small
·
2025
·
IF 12.1
Anhui Yu,Zhiguang Guo
The directional transport and precise control of droplets and bubbles are crucial for future applications, but remain challenging due to complex fluid dynamics and application limits. In light of existing research on droplet manipulation, a MnO 2 /carbon microsphere (MnO 2 /Cs) covalently grafted lubricant-infused slippery surface (SPM) is designed for the manipulation of droplets and bubbles. The structure and morphology of the MnO 2 /Cs are examined using X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM), and the elemental composition and chemical bonds of the compounds are characterized by X-ray photoelectron spectroscopy (XPS), Raman spectra and Fourier transform infrared spectrometer (FTIR). The SPM with a sliding angle as low as 3° is prepared. On the SPM, the rapid transportation and precise control of small droplets can be achieved, with the transportation speed of 5 µL droplets reaching 1 mm s −1 and the round-trip control of droplets also being feasible. The surface is capable of controlling the speed of a 100 µL droplet with a precision of 0.49 mm s −1 , while a 50 µL droplet can be directed with a load of 1 mg. Moreover, bubbles with a volume of 5 to 20 µL can also be transported.
研究领域:
材料科学
·
流体力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Batteries-Basel
·
2024
·Vol. 10
·期 6
·189
·
IF 4.6
Libo Song,Yuanyue He,Zhendong Li,Zhe Peng,Xiayin Yao
Sluggish transfer kinetics caused by solid–solid contact at the lithium (Li)/solid-state electrolyte (SE) interface is an inherent drawback of all-solid-state Li metal batteries (ASSLMBs) that not only limits the cell power density but also induces uneven Li deposition as well as high levels of interfacial stress that deteriorates the internal structure and cycling stability of ASSLMBs. Herein, a fast Li+transfer scaffold is proposed to overcome the sluggish kinetics at the Li/SE interface in ASSLMBs using an α-MnO2-decorated carbon paper (CP) structure (α-MnO2@CP). At an atomic scale, the tunnel structure of α-MnO2exhibits a great ability to facilitate Li+adsorption and transportation across the inter-structure of α-MnO2@CP, leading to a high critical current density of 3.95 mA cm−2at the Li/SE interface. Meanwhile, uniform Li deposition can be guided along the skeletons of α-MnO2@CP with minimized volume expansion, significantly improving the structural stability of the Li/SE interface. Based on these advantages, the ASSLMBs using α-MnO2@CP protected the Li anode and can stably cycle up to very high charge/discharge rates of 10C/10C, paving the way for developing high-power ASSLMBs.
研究领域:
材料科学
·
电化学
✓ 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）