Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Shuya Rui,Na Liu,Lingwei Ren,Yang Liu,Zian Liu,Binghui Wu,Hua Pan,Zhiping Ye
Traditional Mn-Ce catalysts for selective catalytic reduction (SCR) of NO with CO (CO-SCR) in iron and steel flue gases are often hindered by competitive adsorption of NO and CO, which compromises catalytic efficiency. In this study, we present a Ni-doped Mn-Ce catalyst that overcomes these challenges, achieving 96 % NO conversion, 98 % N 2 selectivity, and 44 % CO conversion at 175 °C. Comprehensive characterization of the catalyst reveals that Ni doping significantly enhances Mn-Ce interactions, boosting oxygen vacancy density and promoting efficient redox cycling between Mn 3 + /Mn 4+ and Ce 3+ /Ce 4+ . Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) confirms preferential NO adsorption at oxygen vacancy sites, minimizing CO-NO competition and stabilizing the Langmuir-Hinshelwood mechanism, where both gases co-adsorb and react at oxygen-rich vacancies. Mechanistic insights suggest that Ni facilitates electron transfer, weakening the N–O bond in NO and accelerating its dissociation, resulting in faster NO reduction. This study establishes Ni doping as a promising strategy for improving the low-temperature performance of Mn-Ce-based CO-SCR catalysts, paving the way for more efficient catalytic systems.
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高影响因子
Nanoscale
·
2019
·Vol. 12
·期 3
·2022-2027
·
IF 6.97
Chao Peng,Huanhuan Xing,Yuan Xue,Jin Wang,Jing Li,Erkang Wang
Two-dimensional (2D) Mn–Fe layered double hydroxide (LDH) nanosheets are firstly examined to mediate an O-phenylenediamine (OPD) based fluorescent switch in the presence of ascorbic acid (AA). On one hand, Mn–Fe LDH mimicked the functions of oxidase to catalyze the oxidation of OPD to OPDox, emitting fluorescence at 565 nm. On the other hand, Mn–Fe LDH acts as a superior catalyst for the reaction between AA and OPD to generate 3-(1,2-dihydroxyethyl)furo[3,4-b]quinoxalin-1(3H)-one (N-heterocyclic compound) with an emergence of the maximum emission at 425 nm (ca. 6 fold). The presence of AA not only induces the enhanced emission at 425 nm from the N-heterocyclic compound, but also leads to decreased fluorescence at 565 nm due to the decomposition of Mn–Fe LDH nanosheets. On the basis of the reversed fluorescence response at 425 and 565 nm, ratiometric fluorescence sensing methods (ΔF425 nm/ΔF565 nm) are developed for the determination of AA. With the assistance of alkaline phosphatase (ALP), the activity of ALP can be monitored using the ratiometric platform based on the hydrolyzing ascorbic acid 2-phosphate to yield AA with the detection limit of 0.16 mU mL−1. Different from the traditional ratiometric sensing platform, where two fluorescent probes are often introduced, the present ratiometric system derived from one signal precursor holds great potential in developing a facile platform and broadens the application of 2D nanomaterials in the field of biology.
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高影响因子
CORROSION
·
2023
·Vol. 79
·期 5
·486-496
·
IF 1.6
Zhao Yinghai,Li Wei,Wang Zhenwen,Li Ning,Xu Yanling,Li Deyu
In recent years, in the field of tinplate production, it has become a trend to use lower tin coating mass to lower production costs. However, the preparation of low Sn-coated steel must face two significant problems: toxic chromate post-treatment and low corrosion resistance. In this work, we developed an Mn-Al-P chemical conversion coating using a process sequence-adjusted tinplate of 0.5 g/m 2 tin coating mass as an alternative to the chromate treatment. Meanwhile, by adjusting the subsequence of the reflowing process and the post-treatment process, the wash water and electricity consumption were effectively reduced. The influence of reflowing time on the microstructural appearance, phase composition, surface element distribution, and corrosion resistance of this new brand tinplate was studied. Moreover, the composition was determined by x-ray photoelectron spectroscopy, and further discuss the formation mechanism of this coating. The results show that this mutielement coating could effectively fill tin-free zones on the surface of the tinplate and improve the corrosion resistance when the reflowing time is properly set up to 3.5 s after the process adjustment. However, continually extending the reflowing time would cause the phosphate coating to fall off, leading to the corrosion resistance deterioration. The coating was mainly made up of a series of amorphous phosphate compounds and metal oxides, which was suitable for a tinplate with low tin coating mass.
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MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Asim Mushtaq,Yike Hou,Cong Tian,Tianhao Deng,Changliang Xu,Zhichao Sun,Xiangdong Kong,M. Zubair Iqbal
Multifunctional magnetic photosynthesizer nanocomposites are highly desired to improve the efficacy of the early cancer diagnosis and therapy. However, design a highly biocompatible theranostic system with controlled size and shape at the nanoscale without altering the original properties of the primary materials is a challenging task. Herein, rhombic shaped manganese (Mn) doped titanium dioxide (TiO 2 ) nanocomposites are designed to enhance the generation of reactive oxygen species (ROS) by photocatalytic property and spin relaxation for MRI. Transmission electron microscopy (TEM) results revealed the average size of the synthesized Mn-TiO 2 rhombic nanocomposites (RNCs) was about 20–30 nm with homogeneous shape and dispersion. EDS and XPS analyses proved the incorporation of Mn ions into the anatase TiO 2 lattice. After Pluronic® F-68 surface modification, Mn-TiO 2 -PF-68 RNCs demonstrated negligible toxicity and physiological stability. Prepared fluorescein isothiocyanate (FITC) labeled RNCs are encapsulated by the plasma membrane and surrounded the nucleus of 4T1 mice breast cancer cells which improve the efficiency of prepared RNCs. In addition, the Mn 3+ ions remarkably enhanced the positive contrast (T 1 ) for magnetic resonance imaging (MRI) and presented significant r 1 relaxivity and low r 2 /r 1 relaxivity ratio. Finally, Mn 3+ doped with photosensitizers (TiO 2 ) also exhibited a great synergistic effect of photo-killing in vitro by developing hydroxyl radicals. Therefore, the as-prepared Mn–TiO 2 RNCs are promising candidate as a new kind of multifunctional agent for both MRI and PDT applications.
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JOURNAL OF MEDICINAL CHEMISTRY
·
2021
·
IF 7.446
Keyu Chen,Pan Li,Chunrong Zhu,Zhiyang Xia,Qian Xia,Lei Zhong,Bin Xiao,Tao Cheng,Changqiang Wu,Chengyi Shen,Xiaoming Zhang,Jiang Zhu
Liver-specific contrast agents (CAs) can improve the Magnetic resonance imaging (MRI) detection of focal and diffuse liver lesions by increasing the lesion-to-liver contrast. A novel Mn(II) complex, Mn-BnO-TyrEDTA, with a lipophilic group-modified ethylenediaminetetraacetic acid (EDTA) structure as a ligand to regulate its behavior in vivo, is superior to Gd-EOB-DTPA in terms of a liver-specific MRI contrast agent. An MRI study on mice demonstrated that Mn-BnO-TyrEDTA can be rapidly taken up by hepatocytes with a combination of hepatobiliary and renal clearance pathways. Bromosulfophthalein (BSP) inhibition imaging, biodistribution, and cellular uptake studies confirmed that the mechanism of hepatic targeting of Mn-BnO-TyrEDTA is the hepatic uptake of the amphiphilic anion contrast agent mediated by organic anion transporting polypeptides (OATPs) expressed by functional hepatocytes.
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高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Xiangdong Zhu,Caiyan Shen,Tian Qiu,Yu Zhang,Wei Xu,Guorong Hu,Yanbing Cao,Zhongdong Peng,Ke Du
Driven by the growing demand for energy density of lithium-ion batteries, ultra-nickel- rich layered oxides LiNi x Co y Mn z O 2 (x > 0.9) (ultra-Ni-rich NCM) cathodes attract considerable attention. However, these cathode materials suffer from severe structural degradation during cycling, primarily due to phase transitions, which significantly hinders their long-term application. In this work, ultra-Ni-rich NCM cathode materials with Co- and Mn-rich surface architectures are synthesized using Co/Mn-rich shell precursors and are systematically investigated to evaluate the suitability of different surface chemistries under various electrochemical conditions. The results reveal that the Co-rich surface significantly enhances the electrochemical kinetics by mitigating the Li + concentration gradient between the surface and bulk, thereby effectively suppressing structural degradation. In contrast, the Mn-rich surface, due to the presence of electrochemically inert Mn 4+ , leads to sluggish kinetics and incomplete phase transitions within the voltage window of 2.8–4.3 V. This results in a lower capacity but notably improved structural integrity. Upon increasing the upper cutoff voltage to 4.4V, the Mn-rich shell cathode undergoes more complete phase transitions, leading to a substantial improvement in capacity while maintaining superior structural stability.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xiong Zhao,Jianwu Wei,Jing Li,Xianli Li,Anxiang Guan,Peican Chen,Liya Zhou,Jie Tian,Jiahong Pan,Binbin Luo,Qi Pang
Advanced photocatalytic architectures for sustainable CO 2 reduction encounter two significant challenges involving severe electron-hole recombination and limited active sites. Herein, we synthesize a Z-scheme heterojunction composing of Mn-doped CsPbBr 3 nanoplatelets (Mn-CPB) and zinc phthalocyanine (ZnPc) via self-assembly. Mn 2 + doping in CsPbBr 3 induces spin polarization, creating spin-polarized hot electrons. These electrons transfer via the Z-scheme interface to ZnPc’s Zn 2+ center, thereby enhancing photocarrier separation and mobility and promoting CO 2 adsorption-activation. The heterostructure achieves an exceptional CO evolution rate of 15.17 μmol g −1 h −1 with 78.31 % selectivity, surpassing the performance of individual components under visible light. In-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and density functional theory (DFT) calculations confirm the formation of key intermediates (•CO 2- ) during CO 2 adsorption and reduction. This work presents a strategy integrating spin regulation with interfacial band alignment, advancing perovskite-derived photocatalysts for solar-to-chemical conversion.
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120584
·
IF 7.2
Jian Wang,Kejia Lu,Wei Wang,Jianjun Yu,Yaqi Peng,Guanghua Xia,Guanjie Wang
Atomic defects in catalysts (such as vacancies, substituted atoms, or interstitial atoms) are the decisive factors in initiating low-temperature catalytic reactions. The study achieved the selective exposure of Mn-doped CeO 2 (111) crystal planes and facilitated the migration of oxygen species at the interface through the regulation of Mn and Ce precursors, thereby enhancing the low-temperature catalytic performance for chlorobenzene (CB). The Mn: Ce precursor ratio strongly influences activity; Mn 1 Ce 1 shows optimal performance with T 50 ≈ 142 ℃ and T 90 ≈ 192 ℃. Structural analyses confirm Mn incorporation into the CeO 2 lattice across multiple facets, optimizing Mn-O v -Ce interfacial sites, increasing surface acidity, and elevating oxygen‑vacancy (O v ) concentration (3.6 ×10 13 spins/g). CB was nearly completely mineralized to CO 2 at 240 ℃, while chlorine was mainly removed as HCl. Oxygen is crucial for the dynamic generation and cycling of O v , effectively replenishing the consumed adsorbed oxygen (O ads ) during catalysis, whereas the presence of water vapor causes competitive adsorption, reducing catalytic activity. In-situ DRIFTS, in-situ EPR, and DFT calculations demonstrated that surface O ads are the primary active oxygen species. CB trapped by O v is sequentially converted into intermediates (e.g., phenol and benzoquinone) and ring-opening products (e.g., maleic anhydride and formic acid) under the action of O ads , ultimately mineralizing into CO 2 . The Mn-doped CeO 2 (111) crystal facet exhibited the lowest CB adsorption energy (-2.4 eV), O v formation energy (1.1 eV), and HCl formation energy (-1.3 eV). Furthermore, Mn serves as a dechlorination site, effectively promoting C-Cl bond cleavage and inhibiting chlorine poisoning at CeO 2 interface.
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高影响因子
Communications Chemistry
·
2025
·Vol. 8
·期 1
·389
·
IF 6.2
Han Lei,Tan Jingying,Zhang Yucui
Given the promising prospect of nanozymes in colorimetric test strips, it is essential to eliminate the interferences of their multi-activities and various colors on the test strip. Here, white Mn-based metal-organic frameworks (Mn-MOFs) with ultrathin 2D morphology (3 nm thick) were successfully synthesized by a simple ultrasonic approach. The origin of the white optical property in Mn-MOFs was systematically investigated, revealing that it stems from specific metal-ligand coordination polymerization rather than morphological features or defect states. Mn-MOF nanozymes possessed exclusive peroxidase-mimicking activity rather than oxidase-like activity, effectively resisting O 2 interference during colorimetric assay. Moreover, Mn-MOF nanozymes displayed unique substrate selectivity without additional modification. Unlike other colored nanozymes, the whiteness of Mn-MOF nanozymes enhanced the paper’s whiteness, boosting contrast for colorimetric detection on test strip. This study pioneers a systematic investigation into the origin of whiteness in MOF nanozymes. The coordination-defined properties enable interference-free optical design and O 2 -resistant on-site detection.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 11
·3526-3536
·
IF 4
Junxiang Zhou,Yudeng Wang,Bo Feng,Yong Sun,Jiafu Wang
Ternary transition metal oxides (TMOs) are potentially promising anode materials for lithium storage with high power and energy density. Designing appropriate electrode structures is an effective strategy to sufficiently exhibit the advantages of TMOs for lithium storage. Here, we present the synthetic process and electrochemical properties of carbon-coated mesoporous Ni–Mn–Co–O (NMCO) nanowire arrays (NWAs) grown on Ni foam as an integrated electrode for lithium-ion batteries (LIBs). The electrochemical measurements show that the carbon-coated NMCO integrated electrode exhibits high capacity and cycling properties. In addition, we have also developed an all one-dimensional (1D) structural full cell using an LiMn2O4 nanorod cathode and an NMCO/Ni NWAs@C-550 anode, which exhibits relatively outstanding cycling properties.
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Qin Guo,Chaoting Guan,Luna Luo,Zhen Wang,Hanping Pan,Jin Jiang
Fenton and Fenton-like systems have been successfully applied in treatment of refractory pollutants in water and wastewater, but the formation and disposal of large amounts of ferric sludge is a matter of concern. This study demonstrated that Mn(IV)/HSO 3 − system could effectively degrade atrazine (ATZ) through generation of Mn(III) and SO 4 •− as primary reactive intermediates and meanwhile the sludge could be well controlled. Mn(IV) could be in situ regenerated from oxidation of Mn(II) (i.e., Mn(IV) final transformation product in Mn(IV)/HSO 3 − system) by oxygen under alkaline condition, and was reused for efficiently catalyzing HSO 3 − to degrade ATZ. The metal ions (e.g., Ca(II), Mg(II), Zn(II) and Al(III)) commonly used as coagulant had negligible effects on ATZ degradation by Mn(IV)/HSO 3 − system. The oxidation products of ATZ were identified to further clarify the role of various reactive intermediates in Mn(IV)/HSO 3 − system. Deethyl-atrazine (DEA) and atrazine amide (CDIT) were two primary products during ATZ transformation by Mn(IV)/HSO 3 − system. The molar ratio of CDIT to DEA ([CDIT]/[DEA]) was quantified to be 3.0–4.0 during ATZ transformation by Mn(IV)/HSO 3 − system, which was much higher than those (∼2.3 and ∼0.7) obtained in the cases of authentic SO 4 •− and •OH oxidation (i.e., UV/PDS and UV/H 2 O 2 system), respectively. This result indicated that Mn(III) was a more selective reactive intermediate than SO 4 •− , which was also proved by tertiary butanol scavenging experiments. Based on these findings, the Mn(IV)/HSO 3 − system may be operated in a sequencing batch reactor (SBR) as a durable, efficient, and recyclable technology to treat recalcitrant contaminants in water and meanwhile to achieve ‘zero discharge’ of sludge.
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高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 51
·期 2
·553-561
·
IF 4.39
Dangli Gao,Kaiwei Ma,Peng Wang,Xiangyu Zhang,Qing Pang,Hong Xin,Zihan Zhang,Huan Jiao
Traditional fluorescent materials used in the anti-counterfeiting field usually exhibit monochromatic luminescence at a single-wavelength excitation, which is easily forged by sophisticated counterfeiters. In this work, Zn2GeO4:Mn,x%Li (x = 0 and 20), Zn2GeO4–NaLiGe4O9:Mn,x%Li (x = 50 and 70) and NaLiGe4O9:Mn micro-phosphors with multi-chromatic and multi-mode luminescence have been successfully synthesized via a hydrothermal approach followed by an annealing treatment. As expected these Li+ doped Zn2GeO4:Mn and Zn2GeO4–NaLiGe4O9:Mn phosphors exhibit a double peak emission including a long green afterglow (∼540 nm) and red photoluminescence (∼668 nm). By tuning Li+ doping concentrations, a gradual colour output and a tuneable afterglow duration are achieved. In particular, the Zn2GeO4:Mn,Li and NaLiGe4O9:Mn phosphors exhibit excellent performance as security inks for printing luminescent numbers and anti-counterfeiting patterns, which show an afterglow time-dependent or excitation wavelength-dependent luminescence colour evolution. This work proves the feasibility of the Li+ doping strategy in emission tuning, which can stimulate further studies on multi-mode luminescent materials for anti-counterfeiting applications.
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