WATER RESEARCH
·
2021
·
IF 11.236
Shi-Qi Tian,Jing-Yao Qi,Yun-Peng Wang,Yu-Lei Liu,Lu Wang,Jun Ma
After reaction with permanganate or ferrate, the resulted Mn-loaded and Fe-loaded biochar (MnOx/biochar and FeOx/biochar) exhibited excellent catalytic ozonation activity. O 3 (2.5 mg/L) eliminated 48% of atrazine (ATZ, 5 μM) within 30 min at pH 7.0, while under identical conditions, ozonation efficiency of ATZ increased to 83% and 100% in MnOx/biochar and FeOx/biochar (20 mg/L) heterogeneous catalytic systems, respectively. Radical scavenger experiment and electron paramagnetic resonance (EPR) analysis confirmed that hydroxyl radical (•OH) was the dominant oxidant. Total Lewis acid sites on MnOx/biochar and FeOx/biochar were 3.5 and 4.1 times of that on the raw biochar, which induced enhanced adsorption of O 3 and its subsequent decomposition into •OH. Electron transfer via redox pairs on MnOx/biochar and FeOx/biochar was observed by cyclic voltammetry scans, which also functioned in the improved catalytic capacity. Degradation pathways of ATZ in MnOx/biochar and FeOx/biochar ozonation systems were proposed, with 34.6% and 44.8% of dechlorination effect accomplished within 30 min of reaction, which was improved by 4.1 and 5.3 times compared to pure ozonation. After 12-hour treatment, acute toxicity of ATZ oxidation products was reduced from 38.3% of pure ozonation system to 14.5% and 6.3% of activated ozonation systems with MnOx/biochar and FeOx/biochar, respectively. Mn-loaded biochar and Fe-loaded biochar have great potential for heterogeneous catalytic ozonation of polluted water.
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PubMed
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 4
·793-803
·
IF 3.117
Zhuo Chen,Lvming Dong,Cheng Zhou,Binze Zhou,Zhi Zheng,Rong Chen,Jianfeng Zang
Two-dimensional all-inorganic halide perovskites (CsPbX3, X = Cl, Br or I) have emerged as prominent materials due to their unique properties, including ultrathin thickness in high surface area for catalysis, good mechanical flexibility for flexible electronics/optoelectronics, and high charge extraction and transport for photodetectors. However, the high luminescence of two-dimensional Mn-doped CsPbX3 that is crucial to light-emitting diodes and display applications remains unfulfilled. The existing synthesis approaches of two-dimensional Mn-doped CsPbX3 usually result in low luminescence because of either low solubility of precursors at low temperature or high concentrated nanocubes at high temperature (e.g. 180 °C). Herein, we report a moderate-temperature and atmospheric approach to synthesize highly luminescent Mn-doped CsPbCl3 nanoplatelets with only 4 monolayers. Different Mn–Pb feed ratios are explored to study the morphology evolution from nanocubes to nanoplatelets and the corresponding influence of two emission peaks at around 400 nm and 600 nm. The photoluminescence quantum yield (PLQY) of our Mn-doped CsPbCl3 nanoplatelets is up to 53.76%, which is the highest reported value in Mn-doped two-dimensional all-inorganic halide perovskites. The nanoplatelets exhibit excellent stability at room temperature in air (over 60 days). For the first time, both orange-red and warm white light-emitting diodes (LEDs) have been achieved through the nanoplatelets as the color conversion materials. Moreover, flexible composite fluorescent polymer films based on the nanoplatelets are demonstrated with high luminescence and stability (over 6 months), which indicate prominent potential in flexible displays.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 21
·215605
·
IF 3.551
Yu-Wei Liu,Shao-Hong Guo,Si-Qi You,Chun-Yi Sun,Xin-Long Wang,Liang Zhao,Zhong-Min Su
Halide perovskites have been employed as photocatalysts for CO2 photoreduction due to their excellent optical properties and unique electronic structure. However, their photocatalytic performance is relatively poor. Herein, we demonstrate a new strategy with Mn-doped CsPb(Br/Cl)3 mixed-halide perovskites as catalysts to enhance the efficiency of CO2 photoreduction. By tuning the content of Mn, a series of CsPb(Br/Cl)3:Mn perovskites are obtained and show high efficiency in CO2 conversion to CO and CH4. For the optimum catalyst sample, especially, the yields of CO and CH4 reach 1917 μmol g−1 and 82 μmol g−1 which are 14.2 and 1.4 times higher than those of CsPbBr3. This work provides new insights into improving the reactivity of perovskites in CO2 photoreduction.
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高影响因子
INORGANICA CHIMICA ACTA
·
2020
·
IF 2.304
Ping-Ping Sun,Yu-Hang Zhang,Xuehua Yu,Qi Shi,Bo Tian,Jun Gao,Fa-Nian Shi
A new 3-dimensional (3D) Mn-based metal organic framework (Mn-MOF) was created through hydrothermal method. This Mn-MOF has the molecular formula of C 10 H 10 Mn 3 N 4 O 12 and possesses orthorhombic symmetry in the Pbcn space group. As the electrode material for supercapacitors, a small amount of Cu powder is added to modify the electrode material (Mn-MOF-Cu), which has higher specific capacitance, better cycle stability and longer cycle life than the Mn-MOF. The specific capacitance of the optimized electrode material can reach 1606 F g −1 at 0.5 A g −1 , which is significantly higher than the original Mn-MOF electrode material (1106 F g −1 ). The key aspect which improves the electrochemical behavior of Mn-MOF-Cu is the introduction of Cu powder as a conductive additive, so that the advantages of the unique 3D structure of the Mn-MOF in terms of electron transport can be better displayed.
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Nano Energy
·
2023
·
IF 17.6
Yin Qin,Bin Cao,Xiao-Ye Zhou,Zhuorui Xiao,Hanxiang Zhou,Zhenyi Zhao,Yibo Weng,Jianshuai Lv,Yang Liu,Yan-Bing He,Feiyu Kang,Kaikai Li,Tong-Yi Zhang
The development of efficient oxygen evolution reaction (OER) electrocatalysts is of vital importance for acidic water decomposition. Currently, the rutile structured RuO 2 is considered to be the best candidate and has been studied widely. However, the state-of-the-art rutile RuO 2 still suffers from unsatisfactory activity and stability, while other crystalline structures of Ru-based oxides are seldom reported as OER electrocatalysts. The present work, for the first time, successfully synthesizes orthorhombic (Ru, Mn) 2 O 3 electrocatalyst through cation exchange. The orthorhombic (Ru, Mn) 2 O 3 particles exhibit the outstanding electrocatalysis performance as OER electrocatalyst, showing an ultralow overpotential of 168 mV at 10 mA cm −2 in acidic water and good stability in 40 h of OER. The outstanding electrocatalysis performance is attributed to the distinct Ru d -band structure together with the larger surface density of Ru active site, which reduces the free energy of the rate-limiting step during OER.
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Nanomaterials
·
2023
·Vol. 13
·期 17
·2408
·
IF 5.3
Shijie Wang,Dongxue Song,Lijun Liao,Bo Wang,Zhenzi Li,Mingxia Li,Wei Zhou
Doping engineering of metallic elements is of significant importance in photocatalysis, especially in the transition element range where metals possess empty ‘d’ orbitals that readily absorb electrons and increase carrier concentration. The doping of Mn ions produces dipole interactions that change the local structure of BiOCl, thus increasing the specific surface area of BiOCl and the number of mesoporous distributions, and providing a broader platform and richer surface active sites for catalytic reactions. The combination of Mn doping and metal Bi reduces the forbidden bandwidth of BiOCl, thereby increasing the absorption in the light region and strengthening the photocatalytic ability of BiOCl. The degradation of norfloxacin by Bi/Mn-doped BiOCl can reach 86.5% within 10 min. The synergistic effect of Mn doping and Bi metal can change the internal energy level and increase light absorption simultaneously. The photocatalytic system created by such a dual-technology combination has promising applications in environmental remediation.Keywords:photocatalysis;BiOCl;manganese doping;self-assembly
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高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Cai-Yong Zhu,Meng-Ting Shen,Meng-Jie Qi,Ya-Yu Zhao,Zhen Xu,Peng Li,Jie Ru,Wei Gao,Xiu-Mei Zhang
A new 3D Mn-MOF was prepared with the ligand H 2 L (H 2 L = 5-(pyrazin-2-yl) isophthalic acid) by solvothermal method. Then the Mn-MOF was used as a precursor to synthesize CdS/Mn-MOF composites. The degradation efficiency of Rhodamine B (RhB) by CdS/Mn-MOF (theoretical mass ratio of CdS to Mn-MOF is 1:1) is 98.7% in 60 min, which is 19.7 times and 2.3 times that of Mn-MOF and CdS, respectively. The outstanding performance is owed to the loading of CdS, which significantly broadens the photoresponsive range of Mn-MOF and improves the utilization of visible light. Meanwhile, the heterojunction formed between Mn-MOF and CdS can effectively inhibit the recombination of photogenerated electrons and holes. Furthermore, the photocurrent intensity of CdS/Mn-MOF(50) is higher than that of Mn-MOF and CdS. The photocatalytic performance of CdS/Mn-MOF(50) also exhibits excellent stability and reusability . In addition, the enhanced mechanism of photocatalytic activity was investigated systematically.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Lufang Fan,Jiahui Han,Kai Wei,Changchang Ma,Sheng Feng,Yun Zhou,Xiaojun Dai,Zhiwei Ye,Yang Wang
This study aimed to regulate the band structure and enhance the reduction ability of CdS by substituting it with Mn 2+ . Subsequently, this nano MnCdS solid solution was anchored on the surface of truncated octahedral Cu 2 O through a simple hydrothermal process, forming an S-scheme heterojunction at the interface between MnCdS and Cu 2 O. Equilibrating the Fermi level at the MnCdS/Cu 2 O heterojunction led to spontaneous diffusion of electrons in MnCdS to Cu 2 O, generating an internal electric field that drove the recombination of electrons in the conduction band (CB) of Cu 2 O and holes in the valence band (VB) of MnCdS. Consequently, this process preserved the powerful photogenerated electrons in the CB of MnCdS, facilitating robust photocatalytic hydrogen evolution . The MnCdS/Cu 2 O exhibited a photocatalytic hydrogen evolution rate of 66.3 mmol g −1 h −1 , which was 3.4- and 54.3-times higher than that of MnCdS (19.4 mmol g −1 h −1 ) and Cu 2 O (1.2 mmol g −1 h −1 ), respectively. This study elucidates advanced S-scheme heterojunction catalyst architectures for photocatalytic hydrogen production.
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POWDER TECHNOLOGY
·
2023
·
IF 5.2
Yuming Xi,Yangcheng Lu
In this work, a facile one-pot two-step mechanochemical technology is firstly developed to prepare Fe/Mn-based binary hexacyanoferrates (Na x (FeMn)[Fe(CN) 6 ] y , FeMnHCF)/carbon composites by coupling in-situ construction of the conductive network and solid-state reaction. It is found that construction of hierarchical conductive network is favorable to improve the rate performance and cycling stability, with an 80.5% capacity retention over 1000 cycles at 360 mA/g. Furthermore, the capacity attenuation and stabilization mechanisms are investigated by GITT, EIS , and ex-situ XRD . The capacity attenuation in the early stage can be attributed to the large charge transfer resistance, while in the latter stage the long cycling stability is ascribed to the solid solution reaction with the mitigated stress distortion during the desodiation/sodiation process. Overall, the proposed mechanochemical synthesis of Fe/Mn-based binary hexacyanoferrate shows great potential in environmental friendliness and cost-saving production as well as comprehensive product performance.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ming Yan,Jiangtao Huang,Mengliu Yang,Hao Zhang,Yu Zhu,Nengyu Zhou,Juan Wang
MAX phases are layered ternary carbides and nitrides with unique properties, doping transition metals in it is attracting significant attentions for the processing of this relatively new class of materials. In this paper, a magnetic solid solution MAX phase V 2 (Sn 1− x A x )C ( A = Mn, Fe, Co) was synthesized by doping Mn/Fe/Co atoms into V 2 SnC by pressure-less sintering. The XRD results show that when x = 0.4, the characteristic peak shifts to the right, and the substitution reaches saturation. SEM and TEM show that doping does not change the original layered morphology and hexagonal crystal form, but only the lattice constants decrease slightly. Magnetic test results indicate that V 2 (Sn 1− x A x )C is a typical low-temperature magnetic material with a Curie temperature around 60 K, and the magnetization increases with the increase of doping amount. Moreover, we explained the reasons of V 2 SnC doping A-site instead of M-site and the changing trend of the magnetic moments by first-principles calculations, which are consistent with the experimental results.
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OPTICAL MATERIALS
·
2019
·
IF 2.687
Changhong Li,Ye Li,Tianliang Zhou,Rong-Jun Xie
Mn-doped CsPbCl 3 (CsPbCl 3 :Mn) perovskite colloidal quantum dots (QDs) attract a great deal of interests, and have great potentials for various optoelectronics applications due to their outstanding optical and electrical properties. However, practical applications of CsPbCl 3 :Mn QDs are severely limited by the cumbersome preparation methods and low photoluminescence quantum efficiency (PLQY). Herein, we propose a single-step ultrasonic synthesis method to successfully synthesize CsPbCl 3 :Mn QDs with controlled size and morphology by changing the Mn:Pb ratio. Simultaneously, we introduce triethylamine (TETN) to passivate the surface of CsPbCl 3 :Mn QDs. The phase purity, microstructure, chemical composition and photoluminescence properties of the samples were investigated by means of various analytic techniques. The synthesized QDs exhibit dual emissions of 411 and 601 nm, ascribing to the excitonic emission of QDs and the characteristic Mn 2+ emission, respectively. The quantum yield of the CsPbCl 3 :Mn QDs could therefore be significantly improved from 17.49 to 41.15%. We believe that the facial synthesis method and the surface passivation of TETN can also be applied to other transition metal or lanthanide ions doped lead halide perovskite QDs.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Yanbo Xing,Xi Yuan,Sihang Ji,Michio Ikezawa,Ruosheng Zeng,Haibo Li,Yasuaki Masumoto,Jialong Zhao
Highly luminescent Mn doped perovskite nanocrystals (NCs) are promising in solid state lighting. The thermal stability of Mn 2+ luminescence in Mn: CsPbCl 3 NC/mesoporous silica (MPS) composites was studied at temperature ranging from 80 K to 450 K by steady-state and time-resolved photoluminescence (PL) spectroscopy. The Mn: CsPbCl 3 NCs with various Mn doping concentrations were synthesized by changing the Mn/Pb molar ratios at 190 °C. It was found that the Mn doped NC films showed a more significant decrease in PL intensities and lifetimes at high temperature above 320 K than the Mn doped NC/MPS films, indicating that the Mn 2+ luminescence in doped NC/MPS films exhibited better thermal stability than that of NC films. Further the broadening and shifts of Mn 2+ emission bands in doped NC and NC/MPS films were observed at elevated temperature. The temperature-dependent linewidths of Mn 2+ emission bands were discussed by electron-phonon coupling.
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