CRYSTENGCOMM
·
2023
·Vol. 25
·期 30
·4355-4363
·
IF 3.1
Ling Li,Yuwei Zhong,Yongfei Hu,Jilin Bai,Fen Qiao,Abdelaal S. A. Ahmed,Ghafar Ali,Xiujian Zhao,Yi Xie
All-inorganic lead halide perovskite (LHP) nanomaterials have been recognized as a competitive candidate for optoelectronic applications. However, the lead toxicity and intrinsic instability have limited their commercialization. Herein, a facile room-temperature approach is developed for the synthesis of an environmentally friendly all-inorganic orange-red-emitting Ag-doped and Mn-doped lead-free halide double perovskite Cs2NaBiCl6 (CNBC) in the shape of an octahedron. Only very weak orange-red photoluminescence (PL) is observed in the undoped CNBC octahedrons. However, both Ag and Mn doping heavily enhance the PL intensity of the CNBC samples. The stability of the representative Ag-doped and Mn-doped CNBC is studied under various conditions such as an ambient environment, high temperatures up to 400 °C, and UV irradiation. The alcohol-based photocatalytic performances of the samples are investigated by degradation of Rhodamine B (RhB), methyl orange (MO) and methylene blue (MB) in ethanol, demonstrating a strong and stable photodegradation activity. This work will offer a facile and cost-effective protocol in doped lead-free double perovskites as a stable and environmentally friendly alternative for environmental photocatalysts.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 19
·1-13
·
IF 2.8
Hu Lifang,Yang Kun,Liu Xijing,Zhu Jichao,He Jie,Chen Xiaoyang
Semiconductor photocatalysis is a green and environmentally friendly antibiotic wastewater treatment technology without secondary pollution. In this paper, a series of montmorillonite (MMT) samples loaded with Cu, Mn, and Ni were prepared by impregnation method. The structure and spectral response of the as-prepared samples were characterized by powder X-ray diffraction, energy-dispersive spectroscopy, laser Raman spectroscopy, X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS), electrochemical impedance spectroscopy, and photocurrent response test. The photocatalytic degradation of tetracycline hydrochloride (TCH) was carried out under simulated solar irradiation, and the photocatalytic properties of MMT samples with different loads were investigated. The characterization results show that Cu and Mn have strong interaction with MMT, and composite photocatalyst Cu 10 Mn 10 -MMT has the smallest Nyquist arc and higher photocurrent intensity. Degradation experiments on TCH showed that Cu 10 Mn 10 -MMT had the best photocatalytic degradation, with a degradation rate of 79.78%, three times that of the original MMT. Active substances capture experiments showed that h + and O 2 . − were the main active substances for the degradation of TCH by Cu 10 Mn 10 -MMT. After the combination of Cu, Mn, and MMT, the band structure changed, resulting in more h + and O 2 .− involved in the redox reaction, thereby improving the photocatalytic degradation performance of TCH. In this work, a promising photocatalyst is used to efficiently and greenly degrade antibiotic wastewater.
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CHEMOSPHERE
·
2023
·
IF 8.8
Jiayi Luo,Yunqiang Yi,Zhanqiang Fang
In order to fully exploit the potential of magnetic biochar-based persulfate (PS) systems, Mn was utilized to modify the magnetic biochar-based catalysts through impregnation-pyrolysis method. Taking metronidazole (MNZ), a typical antifungal drug, as the target contaminant, the reactivity of the synthesized magnetic biochar (MMBC) catalyst was evaluated. The degradation efficiency of MNZ in MMBC/persulfate system was 95.6%, which was 13.0 times higher than that in MBC/PS system. The characterization experiments confirmed the degradation of metronidazole by surface binding free radicals, the ·OH and 1O2 played the key role in remove of MNZ in the system of MMBC/PS. Physicochemical characterization, Fe(II) semi-quantitative analysis and masking experiments confirmed that the doping of MBC with Mn increased its Fe(II) content (43.0 mg/g), approximately 7.8 times higher than that of pristine MBC. The increase of Fe(II) content in MBC is the key reason to improve the optimization of MBC modified with Mn. Simultaneously, both Fe(II) and Mn(II) were the key components of PS activation by magnetic biochar. This paper presents a method to optimize the high efficiency of PS activation by magnetic biochar.
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PubMed
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 8
·2493-2499
·
IF 5
Junxing Wang,Fangwei Liu,Jianzhou Wu,Shihui Zou,Jie Fan
Engineering Mn–Na2WO4 catalysts for efficient oxidative coupling of methane (OCM) at low temperatures (T ≤ 700 °C) is appealing yet challenging. Herein, we report a LaCeZr ternary oxide supported Mn–Na2WO4 catalyst, which achieves 20.9% C2 yield at 700 °C with at least 50 hour stability. Characterizations suggest that LaCeZr ternary oxides can promote the redox properties of Mn–Na2WO4 catalysts, which facilitate O2 activation at low reaction temperatures and generate more active oxygen species to activate CH4 into C2 products.
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ACS Nano
·
2019
·
IF 13.903
Shuang-Shuang Wan,Qian Cheng,Xuan Zeng,Xian-Zheng Zhang
Here, a Mn(III)-sealed metal–organic framework (MOF) nanosystem based on coordination between Mn(III) and porphyrin (TCPP) via a one-pot method was designed and constructed. Mn(III), as a sealer, not only quenched TCPP-based fluorescence but also inhibited reactive oxygen species (ROS) generation, which made MOFs an “inert” theranostic nanoparticle. Interestingly, upon endocytosis by tumor cells, MOFs were disintegrated into Mn(II) and free TCPP by intracellular glutathione (GSH) in tumor cells, owing to redox reaction between Mn(III) and GSH. This disintegration would lead to consumption of antioxidant GSH and activated Mn(II)-based magnetic resonance imaging (MRI) as well as TCPP-based fluorescent imaging. More importantly, such a GSH-regulated TCPP release could implement controllable ROS generation under irradiation, which avoided side effects (inflammation and damage of normal tissues). As a consequence, after unlocking by GSH, Mn(III)-sealed MOFs could significantly improve the therapeutic efficiency of photodynamic therapy by combining controlled ROS generation and GSH depletion after precise dual tumor homing.
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Nano Energy
·
2019
·
IF 15.548
Biwei Wang,Jinxiang Zou,Xiaochen Shen,Yuchi Yang,Guangzhi Hu,Wei Li,Zhenmeng Peng,Dustin Banham,Angang Dong,Dongyuan Zhao
Iron-nitrogen-carbon (Fe-N-C) materials featuring Fe-N 4 moieties are promising candidates to replace commercial Pt/C catalysts for the oxygen reduction reaction (ORR). Here we report a novel Mn-Fe-N/S@mC catalyst comprising atomically dispersed Fe-N 4 sites and a trace amount of Mn-N 2 S 2 sites, which are homogeneously anchored on an ordered mesoporous graphitic carbon framework. This dual-metal catalyst is realized based on the chemical conversion of self-assembled Mn 0.43 Fe 2.57 O 4 nanocrystal supracrystals, with the dual metal sites and the graphitic framework derived from nanocrystal cores and the associated capping ligands, respectively. When evaluated as electrocatalysts for the ORR, Mn-Fe-N/S@mC exhibits excellent catalytic activity in alkaline media , outperforming conventional Pt/C and most non-precious-metal catalysts reported previously. Notably, the synergistic effect of having Fe and Mn together improves the catalytic activity by a factor of ~ 5. To better understand the high efficiency of Mn doping in enhancing the activity of Fe-N 4 sites, density functional theory calculations were carried out, revealing that the synergistic interaction between the dual metal sites reduces the *OH reduction energy barrier during the oxygen reduction pathway.
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MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Zhen Cao,Ji Li,Li Wang,Ke Xing,Xi Yuan,Jialong Zhao,Xin Gao,Haibo Li
In this work, the effects of Co 2+ ions on the structural and luminescent properties of intrinsic and Mn doped CsPbCl 3 NCs were studied by using photoluminescence (PL) spectroscopy, X-ray diffraction (XRD) spectroscopy, and transmission electron microscopy (TEM). The undoped and Mn doped CsPbCl 3 NCs with various Co/Pb molar ratios were synthesized at 190 °C. It was found that the quantum yields of purple emissions in these CsPbCl 3 NCs were greatly enhanced up to 30% after Co 2+ ions were doped. The diffraction peaks in XRD patterns shifted to a large angle with the increase of Co/Pb molar ratio, indicating Co doping in Pb-site. Further both intrinsic and Mn doped CsPbCl 3 NCs exhibited uniform cubes with average sizes of 8–10 nm and good crystallinity after Co doping. The enhancement of purple emissions from excitons in the CsPbCl 3 NCs was related to the reduction of nonradiative defects in these NCs through Co 2+ doping.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 23
·22818-22828
·
IF 2.8
Sun Yanlong,Zheng Tong,Zhang Guangshan,Liu Bei,Wang Peng
The regeneration of adsorbent by thermal method may transfer the adsorbed organic pollutants into the air phase. Herein, manganese and cerium are loaded on adsorbent as catalyst to mineralize the adsorbed organic pollutants during regeneration. The modified adsorbent is characterized by scanning electron microscope-energy dispersive spectrometer, Brunauer Emmett Teller-Barrett Joyner Halenda, and X-ray photoelectron spectroscopy. Regeneration of modified adsorbent is evaluated by adsorbent yield and mineralization percentage of the absorbed organic pollutants. The results demonstrate that the mineralization percentage of tetracycline increased about 100% after the modification. Besides, the loaded catalyst can significantly reduce the regeneration temperature. Furthermore, cerium can reduce the adverse impact causes by manganese which will decrease the adsorption capacity of adsorbent. Kinetics, equilibrium, thermodynamic, and other adsorption properties of modified adsorbent towards tetracycline are further studied. The theoretical maximum of adsorption capacity calculated by Langmuir model is 196.4 mg g −1 , and the kinetics of adsorption fits pseudo-second-order model. The adsorption of tetracycline on the adsorbent is feasible, spontaneous, and endothermic. The properties of synthesized composite material are stable; the yield of Ce/Mn/Al 2 O 3 adsorbent can keep higher than 95% even after five adsorption/regeneration cycles. This research provides another perspective on the design and regeneration of adsorbent, which focus on reducing the secondary pollution during adsorbent regeneration process.
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CATALYSIS TODAY
·
2019
·
IF 4.888
Peiman Xu,Lijun Qiu,Licheng Wei,Yiyi Liu,Dingsheng Yuan,Yi Wang,Panagiotis Tsiakaras
The efficient design of highly active, economical and stable electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolyte still remains a great challenge. Herein, Mn doped Ni 2 P microflowers with porous feature directly grown on Ni foam have been successfully synthesized via a facile hydrothermal method and phosphorization treatment. By detailed analyzing X-ray photoelectron spectroscopy results, it can be found that the electronic structure of Ni 2 P can be efficiently regulated by Mn doping. As expected, the Mn-doped Ni 2 P microflowers with an optimal Mn/Ni ratio of 0.053 exhibit a low overpotential of 205 mV for HER and 330 mV for OER to achieve a current density of 100 mA cm −2 in 1.0 M KOH solution. Furthermore, when this electrocatalyst is adopted as both the cathode and anode for overall water splitting, a current density of 10 mA cm -2 is achieved at a cell voltage as low as 1.58 V, accompanied with high stability.
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APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Jianan Li,Xinyong Li,Xin Wang,Libin Zeng,Xin Chen,Jincheng Mu,Guohua Chen
In this work, a spinel cobalt doped manganese oxide catalyst with the morphology of rambutan-like hollow sphere was successfully obtained by a facile carbon sphere-templated and post-calcined strategy. Multiple strategies such as visible light assistant, Jahn-Teller (J-T) effect, Co-Mn synergistic interaction, and abundant active sites exposed have been considered together in this elaborated system. Theoretical calculation was performed to simulate and analysis the catalyst crystal properties. Visible light assistant cobalt doped manganese oxides possessed a much superior performance and the CoMn1/3 sample exhibited the highest catalytic activity. Norfloxacin (NOR) degradation paths were analyzed by HPLC-MS and the visible light-PMS activation coupling mechanism on cobalt manganese oxides was finally speculated from numerous aspects. This study not only provides the multiple regulations of catalysts from the electronic states and morphology, but also demonstrates the promising potential of various coupling techniques integrated in the contaminant remediation.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 39
·20922-20931
·
IF 8.867
Jieyu Liu,Meng Yu,Xuewei Wang,Jie Wu,Changhong Wang,Lijun Zheng,Dachi Yang,Hui Liu,Yan Yao,Feng Lu,Weichao Wang
An alternative material SmMn2O5 mullite with regard to Pt/C is proposed to catalyze the oxygen reduction reaction (ORR) by combining density functional theory (DFT) calculations and experimental validations. Theoretical calculations are performed to investigate the bulk phase diagram, as well as the stability and electrocatalytic activity of the ORR under alkaline conditions for SmMn2O5 (001) surfaces, which are passivated by nitrogen atoms to avoid any spurious interference. The adsorptions of relevant ORR species (O*, OH*, OOH* and OO*) tend to compensate the coordination of manganese atoms to form Mn-centered octahedral or pyramidal crystal fields, and the corresponding binding energies fulfill a linear relationship. An oxygen molecule prefers to be reduced to OH−via a four-electron pathway and this prediction is verified by electrochemical measurements on the as-prepared SmMn2O5 catalyst with a nanorod structure. Volcano curves are obtained to describe the trends in theoretical ORR activity as a function of a single parameter, i.e. the oxygen binding energy. An overpotential of 0.43 V is obtained at the O* binding energy around 3.4 eV, which is close to the experimental observation (0.413 V) in this work. SmMn2O5 mullite exhibits favorable ORR activity and superior stability with only ∼5% decay in activity over 20 000 s of chronoamperometric operation in contrast to ∼15% decrease of Pt/C, making it a promising candidate for a cathode catalyst.
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JOURNAL OF ADVANCED OXIDATION TECHNOLOGIES
·
2016
·Vol. 19
·期 2
·358-365
·
IF 0.738
Yanfang Liu,Guixia Li,Zhili Zhang,Xiang Gao,Jianrui Niu,Junna Zhao,Zaixing Li
γ-Al 2 O 3 supported Manganese and Ferric oxide (Mn-Fe/Al 2 O 3 ) were synthesized and used as catalyst for ozonation of bisphenol A (BPA) in aqueous solution. It was conducted in a semi-batch reactor under different operational conditions, i.e., varying initial pH, ozone flow rate, initial BPA concentration and catalyst dosage. The results indicated that the presence of Mn-Fe/Al 2 O 3 lead to a great enhancement in ozonation of BPA. Using 5 g/L Mn-Fe/Al 2 O 3 evaluated BPA (50 mg/L) removal efficiency up to 84.1% under particular reaction conditions, while that of the single ozonation process was 48.5%. The influence of tert-butanol demonstrated that initiation of hydroxyl radicals was involved and plays an important role in catalytic ozonation. The decrement of solution pH in catalytic ozonation was much higher than that in ozone alone, indicating much small molecule acids produced in catalytic ozonation process. The repeated use the Mn-Fe/Al 2 O 3 proved that it had a good reusability and stability.
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