APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Runren Jiang,Guanghua Lu,Min Wang,Tianjian Dang,Jianchao Liu,Zhenhua Yan
Utilizing photocatalysis to degrade pollution is emerging as a promising way to treat wastewater, but is challenged by low efficiency and scanty toxicity cognition. In this work, Mn 3 O 4 /BiOCl based crystal plane engineering systems are applied for naproxen (NPX) degradation, and Mn 3 O 4 /BiOCl 010 displayed better degradation rate, which is 16 and 8 times than that of the Mn 3 O 4 /BiOCl 001 and BiOCl 010 . According to the degradation pathway analysis and biological toxicity experiments, the toxicity of the degradation solution increased first and then decreased, which may be caused by the mineralization of NPX and more toxic intermediates. Affected by the distinct internal charge transfer directions of the two crystal planes of BiOCl, Mn 3 O 4 /BiOCl 010 heterojunction system has a faster charge transform than that of Mn 3 O 4 /BiOCl 001 . Moreover, the valence cycle of Mn can further accelerate the charge transfer, which can also provide a powerful driving force for NPX elimination.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jing Su,Tao Lyu,Hao Yi,Lei Bi,Gang Pan
A major challenge for effective decontamination of arsenate from aqueous solution is the development of adsorbent possessing enormous high-active sites with strong affinity to realize both high adsorption capacity and reduction of arsenate down to permissive levels. Here we demonstrate that this challenge may be overcome by doping Mn atoms into La 2 O 2 CO 3 materials. The synthesized material (5.26%-MnL) achieved an arsenate capture ability superior to most other currently-reported adsorbents, with the maximum adsorption capacity of 555.6 mg/g. Additionally, this novel adsorbent could dramatically reduce the concentration of arsenate from 3775 μg/L to less than 4 μg/L, well below the acceptable value for drinking water (10 μg/L). The adsorption capacity of 5.26%-MnL was demonstrated to be >300 mg/g over a wide pH range from 4 to 9 and the efficiency was maintained >85% even after three cycles of adsorption/desorption. Through a series of characterizations, both surface complexation and ion exchange were proved to contribute to arsenate removal at low molar ratios of As(V)/5.26%-MnL while forming LaAsO 4 precipitation played a greater role at higher As(V)/5.26%-MnL ratios. Density Functional Theory (DFT) calculations suggested that Mn atoms acted as active species by not only increasing lattice defects and adsorption sites, but also by activating La 3+ in La 2 O 2 CO 3 , which lowered the adsorption energy and facilitated arsenate removal. Due to the high affinity and superior adsorption capacity towards arsenate, Mn-doped La 2 O 2 CO 3 has been demonstrated to be a promising prospect for the remediation of arsenate-polluted water.
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NANOTECHNOLOGY
·
2019
·Vol. 31
·期 6
·065603
·
IF 3.399
Chun Sun,Le Wang,Sijing Su,Zhiyuan Gao,Hua Wu,Zi-hui Zhang,Wengang Bi
White light-emitting diodes (WLEDs) based on all-inorganic perovskite CsPbX3 (X = Cl, Br, I) quantum dots (QDs) have attracted much attention and rely on mixing several colors of perovskites. However, this inevitably leads to a non-uniform light distribution and serious light loss. Here, a novel strategy was demonstrated to obtain white emission by combining the orange and blue emission from CsPb/Mn(Cl/Br)3 QDs. Notably, highly efficient white emission with a photoluminescence quantum yield of 94% was achieved by an anion exchange surface engineering (AESE) strategy. After AESE treatment the surface traps can be eliminated, resulting in improved exciton and Mn2+ emission. A prototype WLED device was fabricated and exhibited excellent optical stability, demonstrating great potential for perovskite QDs in the field of optoelectronics.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yuxiang Sun,Caiyun Yan,Jun Xie,Dan Yan,Ke Hu,Shengxin Huang,Jianping Liu,Yu Zhang,Ning Gu,Fei Xiong
Previous reports from our team revealed the significant potential advantage of Mn–Zn ferrite nanoparticles (NPs) in magnetic resonance imaging (MRI), whereas anisotropic NPs reportedly increased the blood circulation time of nanocarriers. Thus, anisotropic Mn–Zn ferrite displayed a huge potential in cancer synchronous diagnosis and treatment, that is, enhanced MRI observation was performed simultaneously when drug-targeted delivery therapy was applied to the tumor. Here, we developed three shaped Mn–Zn ferrite (Mn0.63Zn0.37Fe2O4) MNPs used as cancer theranostic nanoagents and compared the effect of the three shaped MNPs on cancer theranostics. Compared to the monodisperse sphere MNPs (S-MNPs-PPR) and clustering MNPs (C-MNPs-PPR), worm-like Mn–Zn ferrite MNPs (W-MNPs-PPR) achieved better results in T2-weighted MRI and achieved more sustained drug release than S-MNPs-PPR and more complete drug release than C-MNPs-PPR in vitro. Additionally, polyethylene glycol (PEG) coating and RGD modification encouraged the three shaped MNPs to evade the recruitment of macrophages more easily and to target the integrin-enriched endothelial cells instead. Meanwhile, W-MNPs-PPR coupled with Paclitaxel (PTX) exhibited more delivery of PTX in the integrin-enriched cells than the other two shaped MNPs, and the content of PTX was far more than that of the wild-type Taxol control group. What is more, in vivo results demonstrated that PTX-coated W-MNPs-PPR not only gained good dual-mode imaging in the tumor (MRI and fluorescence images) but also achieved longer blood circulation time and more PTX-targeted delivery to the tumor, as well as more efficiency in tumor cell killing, which make the simultaneous diagnosis and treatment of tumors to be conducted. Therefore, our works further revealed the importance of the NP shape on its functionality and ultimately provided an alternative and efficient worm-like theranostic nanoagent for tumor theranostics.
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PubMed
高影响因子
IONICS
·
2019
·Vol. 25
·期 11
·5485-5494
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IF 2.289
Wang Xiaoqing,Tian Songran,Zhang Xiaoqing,Li Guoyan,Liu Ying,Chen Botao,Cheng Bowen
A 3D Ni 3 S 2 @Mn-Co-OH/NF cross-linked nanosheet heterostructure composite electrode has been successfully fabricated by a facile two-step hydrothermal method. The as-prepared Ni 3 S 2 @Mn-Co-OH/NF composite electrode exhibits a high capacitance (3163 F g −1 at a current density of 3 mA cm −2 ), a superior rate performance (2071 F g −1 at a current rate of 30 mA cm −2 ), and stable cycling property (maintaining 96.6% of the initial capacitance after 4000 cycles at a current rate of 10 mA cm −2 ). This excellent electrochemical performance can be ascribed to the unique cross-linked nanosheet heterostructure formed directly on Ni foam current collector and the synergistic effect between Mn-Co-OH and Ni 3 S 2 of the composite electrode.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Weiwei Chen,Tongchao Shi,Juan Du,Zhigang Zang,Zhiqiang Yao,Meng Li,Kuan Sun,Wei Hu,Yuxin Leng,Xiaosheng Tang
As an outstanding less-Pb candidate, doping Mn2+ ions into perovskite quantum dots (QDs) has received significant interest in the application of light-emitting diodes (LEDs). However, their further applications are impeded by poor chemical instability. Here, the silica-wrapped Mn-doped CsPbCl3 QDs are fabricated via hydrolyzing (3-aminopropyl) triethoxysilane with improved operational stability. Also, the photoluminescence quantum yield as high as 55.4% for the CsPbMnCl3@SiO2 composite is achieved. Silica wrapping can protect the perovskite QDs from damage by temperature and humidity as well as anion exchange. Furthermore, white LED devices are prepared by employing the mixture of green CsPbBr3 QDs and orange-red CsPbMnCl3@SiO2 composites. The as-obtained white LED device operated at a forward current of 20 mA exhibits bright natural light with a high luminous efficiency of 77.59 lm/W, and the corresponding color rendering index of 82 and color temperature (CCT) of 3950 K are obtained. Additionally, the electroluminescence spectrum shows nearly no variation after 24 h operation. This work will promote the Mn-doped CsPbCl3 QDs material to the practical application in solid-state LEDs.
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PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2018
·
IF 4.841
Yuxiang Cai,Xinbo Zhu,Wenshuo Hu,Chenghang Zheng,Yang Yang,Menghan Chen,Xiang Gao
Plasma-catalytic decomposition of low concentration ethyl acetate with LaMO 3 (M = Co, Mn and Fe) perovskite catalyst was investigated in a coaxial dielectric barrier discharge (DBD) reactor. The combination of perovskite catalyst and plasma enhanced ethyl acetate decomposition, and the activity sequence was LaCoO 3 > LaMnO 3 > LaFeO 3 . Characterizations results indicated that the activation of surface oxygen species and amount of oxygen vacancies contributed to ethyl acetate decomposition remarkably. FT-IR analysis demonstrated that the employment of LaCoO3 catalyst also reduced the amount of unwanted by-products. Based on these results, reaction mechanism of ethyl acetate plasma-catalytic decomposition process was proposed.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2014
·
IF 6.007
Moa Z. Granlund,Kjell Jansson,Marita Nilsson,Jazaer Dawody,Lars J. Pettersson
The objective of this paper was to study the influence three promoters (Co, La, Mn) had on the catalytic activity of Rh-based catalysts for autothermal reforming of diesel. The catalysts were supported on CeO 2 -ZrO 2 and the loading was 1 wt.% Rh and 6 wt.% promoter. The catalytic activity was evaluated in a monolith bench scale reactor with Swedish Environmental diesel, MK1. The process parameters employed at the ATR experiments were; O 2 /C ∼ 0.45, H 2 O/C ∼ 2.5 and GHSV ∼ 50,000 h −1 , meanwhile the reactor temperature was ramped from 700 °C to 950 °C. The catalysts were compared based on their fuel conversion, H 2 yield and the selectivity of different short-chain hydrocarbons. The results showed that all three catalysts had both high fuel conversion and H 2 yield in the optimal ATR operation temperatures. The H 2 yield and fuel conversion were increasing in the order Rh/Mn, Rh/La, Rh/Co. To get further insight in the difference between the materials the fresh and aged catalytic materials were characterized. The characterization methods used were H 2 -temperature programmed reduction (H 2 -TPR), powder X-ray diffraction (XRD), and BET surface measurements. The BET surface measurements showed that promotion with La gave improved thermal stability of the material. The XRD showed a high dispersion of all metals except Co, which was present as crystals in the size range of the particles of the support.
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高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Guoling Wu,Ping Li,Dongbo Xu,Bifu Luo,Yuanzhi Hong,Weidong Shi,Chunbo Liu
Visible-light-driven manganese doped SrTiO 3 nanocubes with various manganese atomic percentages in the range of 3–7%, were prepared by a hydrothermal method. These obtained photocatalysts were systematically characterized by XRD, EDX, TEM, STEM, XPS, UV–vis, PL, EIS. The results demonstrated that the Mn 4+ has substituted into the lattice of SrTiO 3 nanocubes and the absorption onset shifted toward the visible region. It is beneficial to the photocatalytic degradation of tetracycline under the visible light irradiation. Interestingly, the optimal doping atomic percentages at 5% exhibited the highest degradation rates (66.7%) in 60 min. The high photocatalytic activity could be ascribed to the Mn doping adjustment the energy band of SrTiO 3 and the highly effective separation of photo-generated electron–hole pairs. Furthermore, the possible photocatalytic mechanism has been discussed based on the active species trapping experiments and ESR analysis.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 20
·15110-15117
·
IF 3.84
Chunyan Zhang,Jiasheng Lai,Juncheng Hu
A series of Mn-doped CdS hollow sphere photocatalysts has been directly synthesized by a simple and facile hydrothermal route for the first time. It was demonstrated that GSH acts as the S source and a gas bubble-template in this process. The products were characterized by XRD, SEM, TEM, HRTEM, XPS, and UV-vis spectroscopy. The as-prepared CdS and Mn-doped CdS hollow spheres all showed much higher activity than P25 under visible light (λ > 420 nm) irradiation. Among them, the 2.0 mol% Mn-doped CdS sample exhibited the highest photoactivity for the removal of organic pollutant RhB, and about 99.2% MO was decomposed after 50 min of visible light irradiation. Moreover, this catalyst also showed good stability, and after four cycles, the degradation efficiency still remained at 85%. The excellent photoactivity of the as-prepared Mn-doped CdS hollow spheres could be attributed to the synergistic effects of its appropriate band-gap structure and the special porous spherical morphology. The unique hollow sphere structure may favor the harvesting of excited light due to its special multiple scattering effect within the interior space, and the doping of Mn2+ may facilitate the generation of photoinduced electrons and hole pairs, and inhibit their recombination rate by acting as temporary trapping sites. This material may have great application potentials in environmental remediation and energy harvesting.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 13
·F1483
·
IF 3.259
Yingjie Chen,Shiben Liu,Zhihao Shi,Jianhua Yu,Hongzhou Dong,Yong Qin,Liyan Yu,Lifeng Dong
Ag-MFe2O4 (M = Co, Mn) nanocomposites were synthesized and loaded onto carbon supports. As-prepared Ag-MFe2O4/C demonstrated higher catalytic activity for oxygen reduction reaction (ORR) than Ag+MFe2O4/C. The direct coupling and electron transfer between Ag and MFe2O4 in nanocomposites were proposed to enhance their catalytic activities. The Koutecky-Levich plots confirmed a direct four-electron reaction pathway for the ORR on Ag-MFe2O4/C. Furthermore, Ag-MFe2O4/C showed superior catalytic activities and excellent stability for oxygen evolution reaction (OER). Thus, Ag-MFe2O4/C nanoparticle are potential non-Pt candidates with bi-functional catalytic activity for ORR and OER.
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高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Hongyan Chen,Xing Chang,Daming Chen,Jinbao Liu,Ping Liu,Yuan Xue,Hualin Lin,Sheng Han
A hierarchically flower-like structure with nanoarrays coupled with 3D macroporous sponge graphene combines the preponderances of the hierarchical nanoarchitecture and composition to enhance electrochemical performance. A graphene-karst cave flower-like Ni-Mn layered double oxides (GL) electrode material was prepared through a mild hydrothermal-carbonization process. As an electrode material, the resulting GL composite exhibited excellent performance with high specific capacitance (1,648 and 1,252 F g −1 at 0.5 and 10 A g −1 , respectively) and good cycling stability (almost 96% retention after 6,000 charge-discharge cycles) for energy storage electrode. The GL composite material acting as a positive electrode for the asymmetric supercapacitor also exhibited high specific capacitance of 116.56 F g −1 at 0.5 A g −1 and excellent cycling stability with 86.7% capacitance retention after 6,000 cycles at a current density of 5 A g −1 . This outstanding electrochemical performance may be attributed to the synergistic effect of the layered double oxides and 3D macroporous graphene oxide sponge.
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