OPTICAL MATERIALS
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2025
·
IF 4.2
Lan Fang,Dengfeng Luo,Jing Zhang,Fukang Wang,Jiayang Zhang,Zheheng Zheng,Zhiqun Xu,Guobin Huang
The commercial applications of lead halide perovskites are limited by their adverse environmental hazards and intrinsic instability. One promising strategy to mitigate the Pb 2+ content is the doping of X 2+ transition metal ions into cesium lead halide CsPbX 3 (where X = Cl, Br, I) perovskite nanocrystals (PNCs). In this study, an ultrafast high-power ultrasonic synthesis method is employed to ensure uniform nucleation and growth of co-doped (Zn, Mn): CsPbCl 3 PNCs. Various analytical techniques are utilized to investigate the phase purity, microstructure, chemical composition, and photo-luminescence properties of the co-doped PNCs. Density functional theory (DFT) calculations reveal that the significantly enhanced optical performance of co-doped (Zn, Mn): CsPbCl 3 PNCs is primarily due to the increased formation energy resulting from the successful incorporation of Zn 2+ into Mn-doped CsPbCl 3 PNCs, without introducing new defect states. Additionally, the co-doped (Zn, Mn): CsPbCl 3 PNCs exhibit high sensitivity and selectivity in detecting Cu 2+ ions. Our findings propose a novel approach for tuning the optical properties of co-doped (Zn, Mn): CsPbCl 3 PNCs, highlighting their potential for applications in fluorescence sensors.
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WATER RESEARCH
·
2024
·
IF 11.4
Hongmei Tang,Meiqing Chen,Pingxiao Wu,Yihao Li,Tianming Wang,Jiayan Wu,Leiye Sun,Zhongbo Shang
Schwertmannite (Sch) is considered as an effective remover of Chromium (Cr) due to its strong affinity for toxic Cr species. Since the instability of Sch, the environmental fate of Cr deserves attention during the transformation of Sch into a more stable crystalline phase. The ubiquitous manganese(II) (Mn(II)) probably affects the transformation of Sch and thus the environmental fate of Cr. Therefore, this study investigated the impact of Mn(II) on the transformation of Cr-absorbed Sch (Cr-Sch) and the associated behavior of SO 4 2− and Cr. We revealed that the transformation products of Cr-Sch at pH 3.0 and 7.0 were goethite and Sch, respectively. The presence of Mn(II) weakened the crystallinity of the transformation products, and the trend was positively correlated with the concentration of Mn(II). However, Mn(II) changed the transformation products of Cr-Sch from hematite to goethite at pH 10.0. Mn(II) replaced Fe(III) in the mineral structures or formed Mn-O complexes with surface hydroxyl groups (-OH), thereby affecting the transformation pathways of Sch. The presence of Mn(II) enhanced the immobilization of Cr on minerals at pH 3.0 and 7.0. Sch is likely to provide an channel for electron transfer between Mn(II) and Cr(VI), which promotes the reduction of Cr(VI). Meanwhile, Mn(Ⅱ) induced more -OH production on the surface of secondary minerals, which played an important role in increasing the Cr fixation. In addition, part of the Mn(Ⅱ) was oxidized to Mn(Ⅲ)/Mn(Ⅳ) at pH 3.0 and pH 7.0. This study helps to predict the role of Mn(II) in the transformations of Cr-Sch in environments and design remediation strategies for Cr contamination.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 22
·13106-13115
·
IF 10.7
Ziying Shi,Enzuo Liu,Biao Chen,Junwei Sha,Lihua Qian,Zhijia Zhang,Xiaopeng Han,Wenbin Hu,Chunnian He,Naiqin Zhao,Jianli Kang
The interaction mechanism of the multi-element oxide electrodes remains a challenge, despite the fact that their synergy can not only improve the electronic structure, but also broaden the working potential window to some extent. Herein, the simple NiMn alloy system was taken up as a model to investigate the origin of the wide voltage window. Compared with conventional electrodes, this sandwich-type nanoporous-NiO(MnOx)@Ni electrode derived from a NiMn alloy could exhibit a wide working potential window of 1.5 V in aqueous electrolyte. The facilitated successive redox reactions between NiO and MnOx throughout the entire potential window strongly promote the capacitance extension without water decomposition, despite the fact that the cycling lifespan was limited by chemical dissolution of MnOx. The assembled quasi-solid-state supercapacitor can overcome the irreversible conversion and exhibit a remarkable lifespan of 5000 cycles at 10 A cm−3 (91% retention) and high energy density (37.67 mW h cm−3 at 0.2 A cm−3). This work provides new perceptions for the design of multi-element collaborative energy storage electrodes.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Jingjing Liu,Mengyuan Zhang,Diru Liu,Yunbo Yu,Guangyan Xu,Hong He
Ammonia selective catalytic reduction (NH 3 -SCR) of nitrogen oxides (NO x ) is a widely adopted method for controlling NO x emissions. However, achieving superior low-temperature activity while maintaining high N 2 selectivity over a broad temperature range remains a major challenge. In this study, a novel mesoporous manganese–titanium–aluminum (Mn-Ti-MA-S) composite oxide catalyst was synthesized by a modified evaporation-induced self-assembly method. The incorporation of Mn and Ti into mesoporous alumina (MA) framework significantly optimized the redox-acidic properties of the Mn-Ti-MA catalyst, with Mn in a highly dispersed state with fully exposed microcrystalline structures. Subsequent sulfur treatment further transformed the Lewis acid sites into Brønsted acid sites, shifting the reaction pathway from a Lewis acid site-dominated to Brønsted acid site-dominated mechanism. This strategy successfully overcame the conventional trade-off between low-temperature activity and high-temperature N 2 selectivity in NH 3 -SCR catalysts. Consequently, the optimized Mn-Ti-MA-S catalyst exhibited excellent catalytic performance, achieving both NO x conversion and N 2 selectivity above 90 % over a wide temperature range (104–400 °C). This work highlights a synergistic strategy that integrates redox and acid sites engineering with reaction pathway regulation, enabling the development of highly efficient NH 3 -SCR catalysts.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Yuanchen Duan,Huan Li,Shiqing Li,Yu Zhou,Rouxin Liu,Zichun Gao,Wanbing Guan,Jun Yang,Jianxin Wang,Xiang Wan,Chunning Zhao,Weichao Wang
Thermal expansion matching is crucial for solid oxide fuel cell (SOFC) cathode design to prevent interfacial delamination or cracking. This work adopts thermal expansion coefficient (TEC) matching as the primary design principle to enable both structural stability and high catalytic activity. A Mn-based mullite-type cathode, SmMn 2 O 5 (SMO), is developed, and composite electrodes with Gd 0.1 Ce 0.9 O 1.95 (GDC) are fabricated. To reveal the structure–property relationships, TEC and electrochemical performance measurements are combined with in situ X-ray diffraction (XRD), Raman spectroscopy, and density functional theory (DFT) analysis. SMO exhibited a low TEC (8.12 × 10 −6 K −1 ) due to anisotropic lattice expansion and phonon scattering confirmed by XRD and Raman. The SMO–GDC composite displayed extremely well-matched TECs with yttria-stabilized zirconia, with only 2.36% deviation across the operating range. Electrochemically, the composite cathode achieved 580.9 mW cm −2 with polarization resistance of 0.193 Ω cm 2 and maintained stable operation for 300 h. DFT further revealed that GDC addition facilitated interfacial charge transfer and shortened Mn–Mn dimers, explaining the enhanced catalytic activity. This cathode material selection strategy, prioritizing TEC matching as the primary principle, provides a new insight into SOFC cathode development.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jianwang Wu,Mei Lin,Ming Liu,Zuliang Chen
Hydrogen peroxide (H 2 O 2 ) is a crucial eco-friendly oxidizer with increasing demand due to its wide range of applications. Activating O 2 with catalysts to generate H 2 O 2 on-site offers a promising alternative to traditional production methods. Here, we design unique crystalline/amorphous heterophase Fe-Mn core–shell chains (ZVI-Mn) for efficient on-site generation of H 2 O 2 and manipulation of subsequent H 2 O 2 activation. The yield of H 2 O 2 on-site produced by ZVI-Mn in water within 5 min was 103.7 mg·L -1 , which was much greater than that of zero-valent iron (ZVI) and amorphous Mn (A-Mn) (0 and 42.5 mg·L -1 ). Raman and density functional theory (DFT) calculations confirmed that *OOH is the key species involved in the on-site generation of H 2 O 2 . Electrochemical tests confirmed the excellent electron-transferring ability, while electron paramagnetic resonance (EPR) revealed oxygen vacancy defects in the catalysts, which proved to be conducive to improving the catalytic activity of ZVI-Mn. Additionally, by regulating the pH of aqueous solution , ZVI-Mn can simultaneously achieve efficient on-site generation of H 2 O 2 and in-situ removal of enrofloxacin from aqueous solution.
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Environmental Progress & Sustainable Energy
·
2025
·
IF 2.3
Guoting Li,Panpan Yu,Yujie Guo,Xiao Mi,Mingyu Liu,Yunlong Ran,Zhongkun He,Baogui Wang,Yingxu Liu,Tannaz Pak
Secondary effluents are regarded as both sources and sinks of emerging contaminants. Adsorption by activated coke (ACO) is successfully being applied in the advanced treatment of secondary effluent from the wastewater treatment plant of China. However, ACO proved ineffective in removing the sweetener acesulfame (ACE). Herein, both mesoporous ACO and microporous activated carbon (AC) were comparatively used for the innovative confinement of Mn oxides within their porous structures by impregnation/calcination to enhance ACE adsorption. The optimal synthesis conditions were determined to be a MnSO 4 ·H 2 O/ACO mass ratio of 1.0% and a calcination temperature of 600°C (Mn-ACO600). Mn-ACO600 exhibited superior ACE adsorption compared to Mn-modified AC. Stable adsorption performance was observed within the neutral pH range, which favors practical applications. The pseudo-second-order model best described the adsorption kinetics, indicating a possible chemisorption mechanism. Both the Langmuir and Freundlich isotherm models could effectively simulate ACE adsorption, with a q max of 299.6 mg/g at 298 K. Thermodynamic analysis indicated a spontaneous and exothermic process (Δ H 0 = −68.51 kJ/mol) with entropy reduction (Δ S 0 = −218.56 J mol −1 ·K −1 ). Both coexisting inorganic anions and natural organic matter had insignificant influences. Furthermore, the recycled Mn-ACO600 retained an acceptable adsorption capability. Three-dimensional fluorescence excitation-emission matrix analysis demonstrated that Mn-ACO600 adsorption effectively removed organic matter from real secondary effluent.
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Reaction Kinetics Mechanisms and Catalysis
·
2025
·
IF 1.7
Cheng Lijun,Lei Juan,Ren Xiaoli,Chang Hong,Ju Baihe
In this study, a series of La-α-MnO 2 catalysts with different La doping amounts were prepared by hydrothermal method. It was found that the introduction of La could reduce the crystallinity of α-MnO 2 and increase the specific surface area of the catalyst. Furthermore, La doping can significantly weaken the Mn–O bond, increase the surface Mn 3+ and O ads content, and enhance the oxygen mobility and low-temperature reducibility. The catalytic results indicated that La doping could significantly improve the catalytic oxidation performance of toluene, and 1%La-α-MnO 2 catalyst exhibited the best catalytic activity for toluene oxidation. The toluene conversion rate reaches 90% when the reaction temperature is only 215 °C. In addition, 1%La-α-MnO 2 catalyst presented good stability and repeatability during 50 h durability test under water vapor.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2015
·Vol. 53
·期 11
·1305-1309
·
IF 3.113
Yuanyuan Xu,Jinming Sun,Hou Chen,Liangjiu Bai,Qian Tao,Lili Yu,Yating Wang
2-Cyanoprop-2-yl dithionaphthalenoate (CPDN) was successfully used as the chain transfer agent to prepare polyacrylonitrile in combination with manganese(III) acetylacetonate (Mn(acac) 3 ) as the initiator. The novel polymerization exhibited well “living”/controlled characteristics. The polymerization behavior was revealed to comply with features of reversible addition–fragmentation chain transfer polymerization process. Mn(acac) 3 played a key role as the initiator rather than the radical trapping agent in polymerization and exhibited better control performance than azo-initiator. The narrowest molecular weight distribution was 1.31 under the condition of [AN] 0 :[Mn(acac) 3 ] 0 :[CPDN] 0 = 200:1:0.025 and AN:DMF = 1:1 (V/V). Various feed ratios of Mn(acac) 3 and CPDN were also investigated in detail. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53 , 1305–1309
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 11
·718
·
IF 5.4
Ma Chen,Zhang Yida,Mu Shuai,Zhang Yuan,Wei Shuoyun,Li Quanfang,Ren Shufang
A novel Hg 2+ sensing strategy has been developed based on a Mn-Au hybrid nanozyme with prominent oxidase-like activity and an aptamer-controlled catalytic switching mechanism. First, a Mn-Au hybrid nanozyme (MnAuNPs) with a distinctive “fried-egg-like” core–shell morphology was synthesized, which exhibited remarkable oxidase-like activity and rapidly oxidized 3,3’,5,5’-tetramethylbenzidine (TMB) into the characteristic blue product (OxTMB) without H 2 O 2 . The Hg 2+ -specific aptamer can adsorb onto the surface of MnAuNPs through electrostatic and Mn-phosphate coordination interactions, which blocks the catalytic sites and markedly suppresses the oxidase-like activity. In the presence of Hg 2+ , the specific T-Hg 2+ -T coordination triggers the detachment of the aptamer from the MnAuNPs surface, thereby restoring oxidase-like activity and inducing distinct color and absorbance change. Accordingly, an effective colorimetric platform for Hg 2+ detection was developed, exhibiting a linear response over the range of 1.0–50 μM with a limit of detection (LOD) of 0.32 μM. In parallel, a paper-based smartphone-assisted sensing platform was developed, enabling on-site Hg 2+ detection in the range of 5.0–50 μM with LOD of 5.0 μM. Through the colorimetric and smartphone-assisted method, accurate quantification of Hg 2+ in the Yellow River water and wastewater samples were achieved with the results in good agreement with those obtained by ICP-OES. Overall, this work establishes a simple and portable H 2 O 2 -free colorimetric sensing strategy based on Hg 2+ -induced catalytic switching for environmental Hg 2+ monitoring. Graphical
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Jing Liu,Hongxi Zhu,Lin Liu,Luliang Liao,Lingfang Qiu,Xun Xu,Youliang Shen,Ping Li,Xiaoyue Shi,Shuwang Duo
Nitrogen-defect-rich DCN enables Mn–N interfacial coupling with MnCo 2 S 4 . • Interfacial Mn–N bonding and S-scheme charge transfer promote efficient charge separation. • Enhanced ROS generation is achieved in the heterojunction under visible-light irradiation. • Optimized catalyst shows high visible-light activity and stability for TC degradation. • Degradation pathways and toxicity evolution demonstrate the deep mineralization and detoxification of TC. Constructing well-defined heterointerfaces is crucial for regulating charge separation and surface reactions in photocatalysts. Herein, MnCo 2 S 4 /g‑C 3 N 5 S-scheme heterojunctions were fabricated via an in-situ growth strategy, in which defect-associated nitrogen sites in g‑C 3 N 5 act as coordination centers to anchor Mn, forming well-defined Mn–N interfacial bonds. XANES/EXAFS analyses and density functional theory calculations confirm the presence of Mn–N coordination at the interface and reveal its role in tailoring the local coordination environment and electronic configuration of Mn. The Mn–N coupled heterointerface promotes directional separation and transfer of photogenerated carriers, as evidenced by photoelectrochemical measurements, electron spin resonance and femtosecond transient absorption spectroscopy, which demonstrate accelerated charge migration and enhanced generation of reactive oxygen species. Benefiting from this interfacial Mn–N bonding-driven charge separation, the optimized MnCo 2 S 4 /g‑C 3 N 5 -II heterojunction achieves markedly improved visible-light photocatalytic activity toward tetracycline degradation, reaching ~90.8% removal within 120 min with an apparent rate constant of 0.01371 min −1 , which far surpasses the individual components. This work highlights interfacial Mn–N bonding engineering as an effective strategy for constructing robust S-scheme heterojunctions with promoted charge separation and surface redox processes. Download: Download high-res image (182KB) Download: Download full-size image
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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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