RSC Advances
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2019
·Vol. 9
·期 14
·8039-8047
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IF 3.049
Peng Gu,Xinghua Zhu,Dingyu Yang
Mn-doped ZnO (MZO) films were prepared on glass substrates using sol–gel dip-coating technology. The microstructural, morphological, optical and photoelectric properties of MZO films were investigated at different withdrawal speeds (WS: 20, 40, 60 and 80 mm s−1). The X-ray diffraction (XRD) patterns showed that all the films obtained were polycrystalline with a hexagonal structure, and the highest crystallinity of MZO films was observed as films were deposited at 40 mm s−1. The UV-Vis spectra revealed that the average optical transmittance of all samples was over 60% and the energy band gap of films decreased from 3.616 to 3.254 eV with the increase in withdrawal speed. The formed Au/MZO/Au photodetectors (PDs) indicate that a device prepared at 40 mm s−1 shows superior properties both in response speed and detection capability, and the rise time is 1.871 s and fall time is 3.309 s at 365 nm for 3 V bias and the detectivity (D*) reaches ∼1.7 × 1010 Jones. Moreover, the responsivity of PDs is also affected by the distance between Au electrodes and external bias. This research provides a simple way to fabricate the UV PDs based on MZO films with faster response and higher detectivity.
研究领域:
材料科学
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半导体物理
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光电子学
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薄膜技术
·
纳米材料
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·
IF 12.2
Zhou Yang,Feng Yuqing,Wen Rui,Huang Qiping,Guo Qin,Lu Xixin,Han Bin,Xie Haijiao,Ma Jinxing,Jiang Jin,Ma Jun,Gao Yuan
Balancing degradation efficiency with environmental sustainability
remains a critical challenge for permanganate (Mn(VII))-based oxidation
processes in environmental remediation. In this study, we report a
novel system initiated by low-dose Mn(VII) dosage (2 μM) in
combination with peroxymonosulfate (PMS), enabling efficient removal
of emerging contaminants exemplified by bisphenol A (BPA), especially
under alkaline conditions (e.g., pH 10). Notably, distinct from conventional
radical or nonradical activation mechanisms, we identified a previously
unrecognized Mn(VII) regeneration process in the Mn(VII)/PMS system,
as supported by a series of complementary evidence from radical quenching
experiments, stopped-flow spectroscopy, DFT calculations, and kinetic
modeling. The in situ generated Mn(VI) from the reaction of Mn(VII)
and BPA was demonstrated to act as the key intermediate, which was
subsequently reoxidized by PMS via a multihydrogen-bonded complex
back to Mn(VII). This Mn(VI)/Mn(VII) interconversion, reported here
for the first time, not only effectively enhanced contaminant degradation
but also significantly improved Mn(VII) utilization efficiency. These
findings broaden the mechanistic understanding of Mn(VII)-based systems
beyond traditional free radical- and Mn(III)/Mn(V)-driven pathways
and open new insights for developing efficient and environmentally
benign water treatment technologies.
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Water
·
2024
·Vol. 16
·期 13
·1795
·
IF 3
Mengxue Li,Lanbao Zhu,Jing Wang,Li Ma,Zhengwei Pan,Wenwei Ji,Xiaoyu Sun,Ruping Li,Xia Li,Shilong Duan,Yule Tao
Mn-substituted FeOOH with different Mn/(Mn + Fe) molar ratios are synthesized, and characterized using FESEM, XRD, FTIR, ICP-OES, BET, Zeta potential, TG-DSC, XPS, and VSM. The results show that the actual doping amounts of Mn are 0%, 3.05%, 6.13%, 9.04%, 12.70%, and 15.14%, respectively. The substitution of Mn promotes the transformation of goethite from FeOOH to MnFe2O4, resulting in a saturation magnetization intensity of up to 14.90 emu/g for G-Mn15%, laying a theoretical foundation for magnetic recovery. The specific surface area of Mn-substituted FeOOH increases from 57.15 m2/g to 315.26 m2/g with an increasing Mn substitution amount. Combined with the abundant oxygen-containing functional groups such as -OH, Fe-O, and Mn-O on the surface, sufficient active sites are provided for the efficient adsorption of U(VI). The TG-DSC analysis results indicate that the substitution of Mn improves the thermal stability of goethite. In addition, XPS analysis results indicate that the substitution of Mn leads to the conversion of Fe3+to Fe2+in goethite, and the conversion of Mn2+to Mn3+replaces Fe3+in the structure of goethite. Fe-O and Mn-O coordinate participate in the adsorption and reduction process of U(VI). The batch experiment results show that the substitution of Mn promotes the adsorption performance of goethite for U(VI). When T = 303 K, pH = 4.0, m/V = 0.5 g/L, and I = 0.01 mol/L NaCl, the maximum adsorption capacity of G-Mn15% for U(VI) is 79.24 mg/g, indicating the potential value of Mn substitution for goethite in the treatment of uranium-containing wastewater.
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CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Wei Wang,Yi Wei,Lei Qiu,Maxim S. Molokeev,Hang Yang,Huiru Liu,Rui Gao,Mengyu Guan,Dong Tu,Guogang Li
Strong magnetic coupling interactions originating from a short Mn–Mn distance in some heavy Mn2+-doped matrices have important effects on luminescence of single Mn2+ ions and close-knit Mn2+–Mn2+ pairs. However, the intrinsic mechanism of controlling spectral regulation remains elusive since the underlying relationship among Mn–Mn distances, magnetic coupling interactions, and optical properties is unclear. Herein, we create an unusual red emission (620 nm) of Mn2+ in a typical tetra-coordinated lattice of Li2CdGeO4 by simply enhancing the Mn2+-doped level in addition to regular green emission (528 nm). Although the dual emission peaks occupy the same tetra-coordinated crystallographic lattice of CdO4, different temperature-dependent emission behaviors are observed, which expands a possibility in optical thermometry sensors. Detailed Mn–Mn distances are calculated via Rietveld refinement analysis, and their effects on the Mn–Mn coupling interactions are evaluated. Furthermore, the Mn–Mn coupling interaction types are identified through electron spin resonance and magnetic measurements. The continuously decreasing distances between Mn2+ ions strengthen the dipole–dipole coupling effect, resulting in the atypical red emission in a tetra-coordinated lattice environment. These findings elucidate the spectral regulation mechanism from the perspective of magnetic coupling interactions, providing a new pathway to regulate Mn2+-related emission.
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Laser & Photonics Reviews
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2025
·
IF 10
Jiayi Yang,Ming Cong,Runnan Ye,Wenya Zhao,Xihan Yu,Feng Wang,Guanjun Xiao,Bo Zou
The lack of red emission component with a high color rendering index (CRI) results in a harsh white light-emitting diode. Here, a high-pressure strategy is introduced to achieve a marked piezochromism that shifts from green to red in zero-dimensional (0D) manganese halide (C 6 H 14 N 2 )MnCl 4 . Note that after the pressure is released, the red emission with intense intensity can be stabilized at ambient conditions. The CRI and color purity of the red emission for the quenched (C 6 H 14 N 2 )MnCl 4 are significantly improved to 72 and 85.9% from the initial 14 and 66.5%, respectively. The irreversible pressure-induced amorphization highly contributes to the quenched high-efficiency red emission through the strengthening of the crystal field and Mn–Mn coupling, associated with the shortening of the Mn─Cl bond length and Mn–Mn distance. This work unravels the underlying mechanism of piezochromism from green to red, and retention of intense red emission from the Mn-based metal halides, greatly facilitating the development of new-generation amorphous-state luminescent materials.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Kaiting Chen,Xinyu Han,Qian Wang,Kaijie Liu,Xiangguang Yang,Yibo Zhang
The selective catalytic reduction of NO by CO (CO-SCR) presents an economical and promising approach to mitigate emissions of NO x and CO from motor vehicles. A bimetallic Rh-Mn supported catalyst Rh-Mn/CoAlO was synthesized through the reduction of citric acid and ethylene glycol, and subsequently employed in the CO-SCR reaction. Tests assessing its catalytic performance revealed that the Rh-Mn/CoAlO catalyst displayed superior CO-SCR activity, maintaining high efficiency (≥90 % at 230 °C) and stability while simultaneously reducing the usage of noble metals. Various characterization techniques, including H 2 -TPR, NO-TPD, CO-pulse, and XPS, indicated that the Rh-Mn/CoAlO catalyst possessed enhanced dispersion of noble metals. This increased dispersion ensured optimal contact between Rh and Mn, as well as the support, fostering a synergistic interaction that facilitated electron transfer. Consequently, the catalyst’s adsorption and activation capabilities for NO were significantly improved. In situ DRIFTs studies further elucidated that the catalyst primarily followed the E-R mechanism, wherein NO is adsorbed onto the catalyst surface, and subsequently, the N and O atoms generated from pyrolysis react with CO in the gas phase. The findings of this study are anticipated to offer an effective strategy for designing catalysts with exceptional low-temperature activity and high dispersibility for the reduction of NO using CO.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Zhimin Gong,Gaobo Wang,Huanhuan Shi,Shuai Shao,Mengjie Wang,Kun Lu,Shixiang Gao
Catalyzed oxidative coupling reactions mediated by enzyme have been proposed as an effective remediation strategy to remove micropollutants, however, little is known about how the Mn(II) redox cycling affects the horseradish peroxidase (HRP)-mediated reactions in wastewater treatment . Here, we explored the removal of two pharmaceuticals and personal care products (PPCPs), methylparaben (MeP) and acetaminophen (AAP), in HRP-mediated reaction system with dissolved Mn (II). It was found that the conversion rate of AAP was about 284 times higher than that of MeP, and Mn (II) significantly inhibited HRP-catalyzed MeP removal but had little influence on that of AAP. X-ray photoelectron spectroscopy (XPS) and theoretical calculations demonstrated that HRP converted Mn(II) into Mn(III), and then generated MnO 2 colloid, which inhibited the removal of the substrates. Moreover, the results of theoretical calculations also showed that the binding energy between HRP and Mn was 27.68 kcal/mol, which was higher than that of MeP (25.24 kcal/mol) and lower than that of AAP (30.19 kcal/mol). Therefore, when MeP and Mn (II) coexisted in the reaction system, HRP preferentially reacted with Mn(II), which explained the different impacts of Mn (II) on the removal of MeP and AAP. Additionally, Mn (II) significantly altered the product distribution by decreasing the amount of polymerization products. Overall, our work here revealed the roles of Mn (II) in the removal of MeP and AAP mediated by HRP, having strong implications for an accurate assessment of the influence of Mn(II) redox cycling on the removal of PPCPs in wastewater treatment.
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高影响因子
FUEL
·
2022
·
IF 8.035
Haoyu Huang,Xin Hu,Zhuoran Hou,Di Yang,Dan Xiang,Liwen Hu
The hydrogen is described as a clean and sustainable alternative to fossil fuels in numerous energy systems. Hydrolysis is an important method for high purity, high volume hydrogen production. In order to accelerate the kinetics of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media, it is essential to explore efficient catalysts. In this paper, the nanoscale self-supported Mn-NiS/Mn-Ni 3 S 4 composite catalysts was assembled on nickel foam. Benefiting from the lattice distortion and vacancy defects caused by the doping of Mn elements, the catalysts exposed an increasing number of electrochemical surfaces and effective active sites, showing impressive electrochemical performance with a HER overpotential of only 94.2 mV at 10 mA/cm 2 and an OER overpotential of only 253 mV to drive 50 mA/cm 2 . Applying as the bifunctional catalysts, the Mn-NiS/Mn-Ni 3 S 4 couple only achieved a low voltage of only 1.52 V to drive 10 mA/cm 2 . This paper provides new ideas and references for the rational design of high-performance sulfide catalysts with non-precious metal composites.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Wentao Li,Qian Zhang,Zuohua Liu,Changyuan Tao,Guocan Zheng,Nanxiong Chen,Dong Wang,Hufei Chen
The long-term accumulation of manganese sulfate residues can lead to the release of soluble manganese ions, thereby contaminating the surrounding environment. Although numerous methods exist to address the issue of soluble manganese ions, current harmless treatment approaches fail to consider the subsequent utilization of manganese slag. This study aims to control the magnetic properties of processed residues by adjusting the addition of barium hydroxide and the reaction duration. Our results reveal that the harmless treatment of manganese sulfate slag is achievable with various amounts of barium hydroxide, and the magnetic properties of the reconstructed slag increase with the increased barium hydroxide dosage. Magnetic separation is employed to separate the magnetic components from the reconstructed slag, and the distribution state of these magnetic substance is modulated by altering the particle size and reagent addition. Under optimal conditions, this study finds that the grade of iron was 24.17 %, the grade of manganese was 8.08 %, and the recovery could reach 79 % for iron and 70 % for manganese. Finally, the fining slag obtained by magnetic separation was utilized as an additive in the preparation of ferrites, reducing the minimum reflection loss of the ferrites to −16.18 dB, signifying up to 90 % electromagnetic wave attenuation. These findings indicate that the fining slags holds great potential as a dopant for ferrites, offering a viable pathway for the resourceful and environmentally friendly treatment of manganese sulfate residues.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Xiao Tian,Jiaxiong Xu
The reported Ag and Mn co-doped Cu 2 ZnSnS 4 thin film has better properties than single-doped Cu 2 ZnSnS 4 . However, the role of Mn in co-doped Cu 2 ZnSnS 4 thin film is still unclear. In this paper, Ag and Mn co-doped Cu 2 ZnSnS 4 thin films with different Mn amounts were prepared by sol-gel method. The crystal phases, morphologies, element compositions, and optical properties of co-doped Cu 2 ZnSnS 4 thin films were characterized to investigate the role of Mn doping. Compared with Ag single-doped Cu 2 ZnSnS 4 thin film, after the incorporation of Mn into Ag-doped Cu 2 ZnSnS 4 , the crystallinity of Cu 2 ZnSnS 4 improves and the micro-strain and dislocation density in the crystal reduce. The valence states of Cu, Zn, Sn, S, Ag, and Mn in co-doped thin film are +1, +2, +4, −2, +1, and +2, respectively. Mn doping can make the grains on the thin film surface enlarge. The MoS 2 interface layer between Cu 2 ZnSnS 4 and Mo becomes thinner and the Urbach energy of Cu 2 ZnSnS 4 decreases after Mn doping. Therefore, Mn in the co-doped Cu 2 ZnSnS 4 thin films shows beneficial effects of enhanced structural, morphological, and optical properties of the films.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Liuyang Yang,Meiqing Shen,Xinhua Li,Liwei Jia,Feng Gao,Wei Li,Xinyu Li,Gurong Shen
Passive NO x adsorbers (PNAs) are promising materials for mitigating cold-start NO x emissions, yet their performance is often limited by poor adsorption kinetics and insufficient hydrothermal durability. Herein, we report a triethanolamine (TEOA)-assisted synthesis strategy for Mn/CeZrO x PNAs that enables highly dispersed MnO x species with strengthened Mn-support interactions. Compared with conventionally prepared Mn/CeZrO x , the TEOA-modified materials exhibit (i) faster NO x adsorption rates during the initial cold-start relevant stage, (ii) a higher nitrate formation rate and a more suitable nitrate decomposition window (200–400 °C) in which the downstream selective catalytic reduction unit utilizing Cu-SSZ-13 SCR catalysts typically displays optimized NO x reduction efficiency, and (iii) enhanced hydrothermal stability with reduced MnO x agglomeration after aging. A combination of spectroscopic and microscopic techniques (XPS, UV–vis, DRIFTS, TEM/EDS) reveal that TEOA modulation promotes uniform MnO x dispersion, increases surface O ads species, and shifts MnO x speciation toward more active states. These structural and chemical modifications collectively account for the improved PNA performance. This work demonstrates a simple yet effective synthesis approach to optimize Mn-based PNAs, providing new insights into the design of thermally robust, precious-metal-free cold-start NO x control materials.
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GREEN CHEMISTRY
·
2026
·
IF 10.6
Lei Yang,Jiacheng Gao,Min Su,Li Yua,Yuan Wang,Dajun Wang,Heng Zheng,Shaojun Yuan,Like Ouyang
The depolymerization of waste polyethylene terephthalate (PET) has predominantly focused on zinc-based catalysts, benefiting from their stable Lewis acidity derived from unique 3d orbital electronic configurations. In contrast, manganese-based catalytic materials, which share similar electronic structural features, have rarely been explored. This study developed a synergistic catalytic system using commercially available, low-cost homogeneous MnCl₂·4H₂O and heterogeneous Mn₂O₃ for the methanolysis of PET which achieved complete PET conversion within 1 hour at 180°C with a dimethyl terephthalate (DMT) yield of 95.35%. Compared with other catalytic systems for PET depolymerization, the present system uniquely integrates the capability of homogeneous Mn²⁺ ions to rapidly activate methanol and swell PET with the structural stability and ease of recovery inherent to the heterogeneous Mn₂O₃ oxide. Through systematic in-situ and ex-situ characterizations (XRD, XPS, in-situ DRIFTS, etc.), it was revealed that the essence of the synergistic effect originates from a dynamic composite active center formed at the interface between Mn²⁺ and Mn₂O₃, which efficiently stabilizes key reaction intermediates and promotes product desorption. Aspen Plus process simulation and economic analysis further validate its industrial potential: although the synergistic system introduces an additional step for homogeneous catalyst recovery, its superior product yield and lower activation energy grant it significant economic advantages and industrial potential. In summary, this work establishes a novel homo-heterogeneous catalytic system, offering a strategic approach to develop efficient and scalable solutions for polyester degradation.
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