NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 4
·2285-2294
·
IF 3.591
Nannan Liu,Simin Shang,Dajun Shi,Qingrong Cheng,Zhiquan Pan
Thanks to the unique structure and properties of MOFs, a well-designed novel hollow ZnO/Mn-ZIF-67 composite photocatalyst was synthesized by a facile sonocrystallization approach successfully. The hollow ZnO/Mn-ZIF-67 composites exhibited higher photocatalytic activity in degrading Bismarck brown R than pure hollow ZnO spheres and Mn-ZIF-67. The optimal ZnO/Mn0.5-ZIF-67 showed the highest catalytic activity with 89.5% Bismarck brown R removal within 100 min. The improved photocatalytic activity of the composites could be mainly attributed to effective photogenerated charge separation and transfer through the coupled Z-scheme heterojunction between hollow ZnO spheres and Mn-ZIF-67. The composite photocatalyst exhibited obviously good stability and recyclability after recycling 4 times. Finally, a possible Z-scheme electron transfer mechanism was proposed based on the active radical trapping experiments and ESR which could explain the improved photocatalytic performance of the photocatalytic system. This work provides a promising approach to construct a direct Z-scheme heterojunction for the degradation of environmental pollutants.
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Journal of Physical Chemistry C
·
2020
·
IF 4.189
Yubin Zhao,Xiao Zhang,Cong Xie,Wenbin Shi,Ping Yang,San Ping Jiang
Although inorganic cesium halide lead perovskite nanocrystals (NCs) exhibited tunable photoluminescence (PL), it is still a challenge for such NCs with multicolor and white emission for application. In this article, as-synthesized Mn:CsPbCl3 NCs were treated using an oleoamine solution of CdX2 (X = Cl, Br) to get a high PL quantum yield (PLQY) and stability. CdCl2 passivated the surface defects of Mn:CsPbCl3 NCs through anion exchange to get high PL intensity, especially to increase Mn emission. The PLQY of the sample was increased from 15 to 85% after ion exchange. Furthermore, the treatment of CdBr2 resulted in the appearance of a powerful blue emission peak, and the PLQY increased to 95.7%. The PL decay kinetics of samples was studied before and after treatment. Mn2+ emission in Mn:CsPb(Cl/Br)3 NCs was increased because of the reaction of CdBr2 and Mn:CsPbCl3 NCs. Interestingly, the tunable and bright white emission from Mn:CsPb(Cl/Br)3 NCs was obtained by controlling the amount of Br. The controlling of Mn emission plays an important role in changing the Commission Internationale de l’Eclairage color coordinates. Because of bright and tunable PL, the NCs may be used in white-light-emitting diodes.
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Nature Communications
·
2020
·Vol. 11
·期 1
·1-8
·
IF 12.121
Feng Jiaqi,Gao Hongshuai,Zheng Lirong,Chen Zhipeng,Zeng Shaojuan,Jiang Chongyang,Dong Haifeng,Liu Licheng,Zhang Suojiang,Zhang Xiangping
Developing effective catalysts based on earth abundant elements is critical for CO 2 electroreduction. However, simultaneously achieving a high Faradaic efficiency (FE) and high current density of CO ( j CO ) remains a challenge. Herein, we prepare a Mn single-atom catalyst (SAC) with a Mn-N 3 site embedded in graphitic carbon nitride. The prepared catalyst exhibits a 98.8% CO FE with a j CO of 14.0 mA cm −2 at a low overpotential of 0.44 V in aqueous electrolyte, outperforming all reported Mn SACs. Moreover, a higher j CO of 29.7 mA cm −2 is obtained in an ionic liquid electrolyte at 0.62 V overpotential. In situ X-ray absorption spectra and density functional theory calculations demonstrate that the remarkable performance of the catalyst is attributed to the Mn-N 3 site, which facilitates the formation of the key intermediate COOH * through a lowered free energy barrier.
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ACS Biomaterials Science & Engineering
·
2020
·
IF 4.152
Yijue Wang,Liqing Zou,Zhe Qiang,Jianhai Jiang,Zhengfei Zhu,Jie Ren
Radiotherapy (RT) is a major treatment method for non-small-cell lung cancer (NSCLC), and development of new treatment modality is now critical to amplify the negative effects of RT on tumors. In this study, we demonstrated a nanoparticle-loaded block copolymer micellar system for cancer hyperthermia treatment (HT) that can be used for synergistic therapy under alternating magnetic field (AMF) and radiation field. Block copolymer micelles (polyethylene glycol-block-polycaprolactone, or PEG-PCL) containing hyaluronic acid (HA) and Mn–Zn ferrite magnetic nanoparticles (MZF) were fabricated via a two-step preparation. HA-modified Mn–Zn ferrite magnetic nanoparticles (MZF-HA) can be enriched in CD44 highly expressing tumor cells, such as A549 (human lung adenocarcinoma cell line), through an active targeting mechanism via receptor–ligand binding of HA and CD44 (HA receptor). MZF can generate thermal energy under an AMF, leading to a local temperature increase to approximately 43 °C at tumor sites for mild HT, and the increased tumor oxygenation can enhance the therapeutic effect of RT. In vitro experiments show that MZF-HA is able to achieve excellent specific targeting performance toward A549 cells with excellent biocompatibility as well as enhanced therapy performance under HT and RT in vitro by apoptosis flow cytometry. In the A549 subcutaneous tumor xenografts model, MRI confirms the enrichment of MZF-HA in tumor, and hypoxia immunohistochemistry analysis (IHC) proved the increased tumor oxygenation after HT. Furthermore, the tumor volume decreases to 49.6% through the combination of HT and RT in comparison with the 58.8% increase of the untreated group. These results suggest that the application of MZF-HA is able to increase the therapeutic effect of RT on A549 and can be used for further clinical NSCLC treatment evaluation.
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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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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2023
·
IF 2.7
Feng Tian,Yu Gao,Anping Wang,Lan Xiang,Qikui Man,Hui Xu,Baogen Shen
Efficient microwave absorbing materials are required to solve electromagnetic interference and electromagnetic pollution problems. It has been known that the electromagnetic wave (EMW) absorption properties of ferrites can be improved by element substitution. In this study, the hexagonal Ba 2 Co 2 Mn x Fe 12- x O 22 ( x = 0.0, 0.4, 0.8, 1.2 and 1.6) ferrites were prepared by the solid-phase sintering method, and the effect of Mn substitution on structural, magnetic and microwave absorption performance were investigated in detail. Due to the impact of lattice distortion caused by doping Mn ions in Ba 2 Co 2 Fe 12 O 22 ferrites, the concentration of oxygen vacancy increases first and then decreases with increasing Mn substitution. The real part of complex dielectric constant ( ε' ) of Ba 2 Co 2 Mn x Fe 12- x O 22 ferrites decreases with increasing ×, which can be attributed to the formation of a stable ion pair (Mn 3+ - Fe 2+ ) due to the doped Mn ions entering the octahedral (B) sites. The real part of complex permeability constant ( μ' ) of ferrites increases with the increase of Mn substitution due to the decreased magneto-crystalline anisotropy. The effective absorption bandwidth (EAB) of ferrites increases from 5.5 GHz to 9.1 GHz with the increase of Mn substitution from x = 0 to 1.6, significantly improving microwave absorption performance. The EAB of Ba 2 Co 2 Mn x Fe 12- x O 22 ferrite at x = 1.2 reaches 8.74 GHz at a thickness of only 1.57 mm, which could be employed as microwave absorbers due to its broad bandwidth, strong absorption, and small thickness. The excellent performance is mainly attributed to the synergy effect of multiple reflections, natural resonance, dipole polarization and good impedance matching.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Mingyi Liu,Hanchun Chen,Pengfei Xiao,Haodong Ji
Copper-manganese composite metal oxides (CuMnO y ) were prepared by hydrolysis-driven oxidation-reduction method and used to activate sulfite to degrade chlortetracycline hydrochloride (CTC) for the first time. The Jahn-Teller ions Mn 3+ and Cu 2+ exist in CuMnO y , which form a solid electric charge transport redox system and ensure the continuous generation of reactive oxygen species (ROS). Through the systematic study of the experimental parameters such as sulfite concentration, catalyst metal molar ratio, catalyst amounts and initial pH, the optimal degradation rate of CTC could reach 91.74% within 10 min and 94.46% after 30 min. The major reactive radicals were determined by radical quenching experiments and electron paramagnetic resonance (EPR) trapping techniques, and it was confirmed that SO 4 •- and •O 2 - played a nonnegligible role in the process of degrading CTC. Density functional theory (DFT) calculations show that higher Fukui indices ( f - and f 0 ) of CTC sites are more vulnerable to free radical attack. CuMnO y has low CTC degradation intermediate toxicity, high catalytic performance, good anti-interference ability, reusability and stability, and possesses decent application potential in the actual water treatment field.
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FUEL
·
2023
·
IF 7.4
Xin Guo,Zhiyong Ding,Na Kang,Liu Yang,Yuanjiang Wang,Cheng Zhang,Zhaoqiang Li,Tiantian Zhang,Yan Wang,Yu Wang,Hao Qu
The zeolite-based catalyst is a promising option for the selective catalytic reduction (SCR) of nitrogen oxides (NO x ) due to its low toxicity. However, the challenge lies in its low-temperature activity. This study developed a multi-component catalytic system consisting of Ce/Mn/Cu-loaded Beta zeolite to reduce NO x . With fixed contents of Cu and Mn, we investigated the NH 3 -SCR process and the mechanism of action of the rare-earth species (i.e., Ce) in the system. Upon optimization of the content of Ce, the Ce/Mn/Cu-loaded Beta zeolite demonstrated enhanced low-temperature activity compared to samples loaded with Cu or Cu/Mn in the temperature range of 150–250 °C. When Ce was loaded in an appropriate proportion, it regulated the oxidation state of Cu, optimizing active adsorption species for NO and strengthening the strength of Brønsted acid sites in the catalyst. These synergetic effects led to improved NH 3 -SCR catalytic performance. This study can contribute to a better understanding of multiple metal-loaded zeolites in the NH 3 -SCR process and inform future design of Beta-type catalysts.
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Results in Physics
·
2023
·
IF 5.3
Jin Qiu,Wen-Juan Huang,Young Jin Lee,Seung Kim,Xiang-Bai Chen,In-Sang Yang
Magnetism in van der Waals (vdW) materials has recently garnered significant attention due to their potential for advanced applications. In this study, we investigate the magnetic transition in layered MPSe 3 (M = Fe, Mn) bulk flakes utilizing temperature-dependent Raman spectroscopy. Our findings reveal unique features in the Raman spectrum that are strongly correlated with the antiferromagnetic ordering in MPSe 3 . We analyze the spin-dependent Raman scattering modes in MPSe 3 by applying the Suzuki–Kamimura formalism. Consequently, our comparative analyses of the spin correlation function and the reduced magnetization provide compelling evidence of the 2D Ising characteristic especially in FePSe 3 . Our results clearly show the potential of MPSe 3 as a prominent platform for exploring fundamental aspects of low-dimensional magnetism.
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ChemistrySelect
·
2023
·Vol. 8
·期 18
·e202204645
·
IF 2.1
Yingzi Huang,Xue Ye,Xinhua Gao,Lisheng Guo,Yaqiong Wang,Wenlin Xu,Jie Li
Graphical A hollow microcage structured CoMn- x catalyst was synthesized by the template method. In which abundant CO 3+ as well as surface reactive oxygen species on the surface of the CoMn-2 catalyst enabled it to exhibit extremely high catalytic activity for CO under space velocity 36,000 mL g cat −1 h −1 , being able to completely eliminate CO at 80 °C and maintain stable catalytic activity for up to 100 h. Cost-effective and highly efficient catalyst is a promising way for the removal of CO in automotive exhaust purification. Herein, a series of novel self-assembled CoMn bimetallic catalysts with hollow microcage structure have been prepared through zeolitic imidazole framework (ZIF-67) assisted method followed by direct pyrolysis in static air. Both the Mn loading and the unique hollow microcage structure play important roles in CO low-temperature oxidation, and the highest catalytic activity is obtained for CoMn-2 catalyst, which presents T 100 (temperature of 100 % CO conversion) at 80 °C. Through a systematic series of experiments, we further demonstrate that our catalysts’ superior catalytic performance arises from small particle size, high surface active oxygen content and Co 3+ /(Co 2+ +Co 3+ ) ratio. Such configuration of catalysts will pave the way for new strategies to design noble-free high-performance catalysts for CO low-temperature oxidation.
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Catalysts
·
2023
·Vol. 13
·期 7
·1031
·
IF 3.9
Jie Lin,Yihong Ding,Huile Jin,Tianbiao Zeng
Nickel, cobalt, and manganese oxides are easily obtainable non-noble metal catalysts for water splitting. However, the relationship between composition and catalysts’ performance still needs systematic studies. Herein, guided by theoretical calculations, a low overpotential, easily prepared Mn-doped Co3O4was deposited on graphite plates for water splitting. The 30% Mn-doped Co3O4(Co2.1Mn0.9O4) required the lowest overpotential for oxygen evolution reaction (OER), in which the Co2.1Mn0.9O4reached 20, 30, and 50 mA cm−2in the overpotentials of 425, 451, and 487 mV, respectively, with 90% IR compensation. Under overall water-splitting conditions, the current density reached 30 mA cm−2at an overpotential of 0.78 V without IR compensation. Charge density difference analysis illustrates that doped Mn provides electrons for O atoms, and that Mn doping also promotes the electron fluctuation of Co atoms. XPS analysis reveals that Mn-doping increases the chemical valence of the Co atom, and that the doped Mn atom also exhibits higher chemical valence than the Mn of Mn3O4, which is advantageous to boost the form of based-OOH* radical, then decrease the overpotential. Considering the particular simplicity of growing the Co2.1Mn0.9O4on graphite plates, this work is expected to provide a feasible way to develop the high-performance Co-Mn bimetallic oxide for water splitting.Keywords:water splitting;bimetallic oxides;Mn-doped Co3O4;DFT calculation
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