Biomaterials Science
·
2021
·Vol. 9
·期 20
·6830-6841
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IF 6.843
Liming Ruan,Gao Song,Xueya Zhang,Tianqi Liu,Yanfang Sun,Junlan Zhu,Zhiyong Zeng,Guohua Jiang
The development of multifunctional nanoformulations (NFs) include several features in a single nanosystem for these devices to overcome the disadvantages of inefficiency and undesirable toxicity of traditional therapies and provide new opportunities in the management of tumors. Herein, multifunctional CaO2@Mn-PDA NFs with a core–shell structure, integrating the photothermal conversion properties of Mn-PDA, the chemodynamic properties of doped Mn ions, and relieving hypoxia in the tumor microenvironment (TME) were developed. The as-fabricated CaO2@Mn-PDA NFs were embedded in microneedles (MNs) for transdermal delivery into tumor sites, leading to the generation of a new minimally invasive and synergistic therapeutic strategy against skin melanoma. Under near-infrared (NIR) light irradiation, the CaO2@Mn-PDA NFs exhibited a synergistic therapeutic effect, including photothermal therapy (PTT), chemodynamic therapy (CDT), and modulating hypoxia due to their high photothermal conversion efficiency, boosted intracellular production of reactive oxygen species, excellent chemodynamic reactions, etc. Therefore, the developed MN platform, which can build implanted multifunctional characteristics for on-demand NIR-induced synergistic therapy, have a bright future in tumor suppression.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Wei Zhang,Wei Liu,Guoliang Li,Wei Du,Jianbo Lu,Jianguo Song,Qixia Yang,Xiangming Li,Huizhong Xu,Xu He,Jun Ma
The para arsanilic acid ( p -ASA) used as feed additive in the poultry and swine industries tends to transform into more toxic inorganic arsenic (As(V) and As(III)), leading to a greater risk to human health and environmental system. In this study, simultaneous adsorption and oxidation of p -ASA was achieved by a synthesized highly efficient nanostructured Fe-Ti-Mn composite oxide (FTMO), with a high specific surface area of 424.7 m 2 /g. The maximum adsorption capacity for p -ASA could be as high as 45.6 mg/g, meanwhile the combined oxidation/photo-oxidation processes led to the formation of intermediate containing hydrazine group, however, without release of toxic inorganic As(III) and As(V). The p -ASA adsorption by FTMO was verified as the chemisorption process with the formation of inner-sphere complexes at the solid/water interface, which was prominently influenced by solution pH, coexisting ions and humic acid, however relatively insensitive to ionic strength. The systematic characterization by FTIR, XPS, EPR and XANES revealed that Fe phase of FTMO played the dominant role for p -ASA adsorption, while Mn and Ti phases were responsible for the oxidation and photo-oxidation of p -ASA, respectively.
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高影响因子
Metals
·
2020
·Vol. 10
·期 12
·1574
·
IF 2.117
Ruochen Shen,Chaohui Pu,Xiaoou Xu,Youpeng Xu,Zhilin Li,Zhu Wu
The research aims to study the effect of adding mischmetal (Mm) to the TiFe0.86Mn0.07Co0.07alloy on its hydrogen storage performance and cyclic stability. The results show that TiFe0.86Mn0.07Co0.07+ x% Mm (x = 0,4,6,8) alloys can be easily activated. The hydrogen absorption capacity of TiFe0.86Mn0.07Co0.07+ 4% Mm reaches 1.76 wt% (mass fraction) at 298 K. With the increase of Mm addition, the hydrogen storage capacity decreases slightly. Furthermore, after 40 absorption and desorption cycles in hydrogen containing 250 ppm O2, the alloy still has 36% of its initial hydrogen storage capacity, and the alloy can recover 93% of its hydrogen storage capacity through heat treatment.Keywords:TiFe hydrogen storage alloys;life test;impure hydrogen gas;cyclic stability
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 32
·13619-13625
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IF 3.288
Jingkun Xu,Junfeng Qu,Haibao Shao,Shuhong Xu,Chunlei Wang,Yiping Cui
Metal halide perovskites have proven to be reliable white light-emitting materials from a single component. Ordered metal halide perovskite arrays have drawn much attention because of their applications in lasing and displays. However, perovskite arrays capable of emitting white light are still underresearched. Herein, a C4N2H14PbxMn1−xBr4 perovskite ring array based on a feasible and simple 2D colloidal crystal template is reported. By optimizing the molar feed ratio (C4N2H14Br2/PbBr2/MnBr2 is 4/3/1), bright white emission has been achieved, which originates from both C4N2H14PbBr4 and the Mn dopant. The diameters of perovskite rings can be tuned continuously from 2.5 μm to 6.2 μm by simply preprocessing the template as confirmed by observing the changes in the contact area between the annealed template and the substrate as well as the drying process of the perovskite precursor. Compared with perovskite thin films without a template, the perovskite ring array has better stability in humid environments. By coating an ultraviolet light-emitting diode (LED) chip with a C4N2H14PbxMn1−xBr4 ring array film, we fabricated white LEDs which showed high color quality with CIE color coordinates of (0.32, 0.32), a color rendering index of 85, and a correlated color temperature of 5645 K.
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高影响因子
SOLAR ENERGY
·
2020
·
IF 4.608
Fan Sui,Mingyue Pan,Zhengyan Wang,Ming Chen,Wenjie Li,Yan Shao,Weimin Li,Chunlei Yang
The emission and absorption properties of Mn doped CsPbCl 3 NC make it ideal candidates as luminescent down shifting layer material for solar cells, However, effective Mn doping and further quantum yield improvement remains challenging. We present our modified hot injection route to obtain Mn doped CsPbCl 3 nanocrystals with different morphologies and enhanced quantum yield. The samples presented were synthesized with precursor MnCl 2 and PbCl 2 with the ratio of 1:1, 1:2, 1:2.5 and 1:3. For samples with lower Mn doping level, the as prepared samples are uniform nanocubes with average size of 11 nm. When MnCl 2 amount is increased beyond 2.5, large piece of nanosheets were found by TEM and AFM with ultrathin thickness and strong quantum confinement effect. CsPbCl 3 nanocrystals with optimal Mn doping level show enhanced quantum yield of 69%. Luminescent down shifting layers prepared from Mn doped CsPbCl 3 nanocrystals successfully increased short-circuit current (6.67%) and PCE (1.67%) of Cu(In,Ga)Se 2 solar cell.
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高影响因子
CATALYSIS TODAY
·
2020
·
IF 5.825
Hong Du,Miao Jiang,Xiuyun Ma,Peifang Yan,Z. Conrad Zhang
The rapid consumption of fossil resources and the grim environmental situation encourage the application of renewable and clean energy resources. Conversion of biomass, which is a kind of renewable, CO 2 neutral as well as abundant reserves carbon containing resource, is significantly important. The production of fuels from biomass by means of gasification and Fischer-Tropsch synthesis is one of the most promising routes for industrial applications. The wax-free liquid fuels synthesis directly from H 2 -deficient syngas similar to bio-gas is highly advantageous for reducing investment and operating cost. Thus, the Mn-promoted meso-ZSM-5 supported cobalt catalyst was applied for the production of wax-free liquid fuels by catalytic H 2 -deficient syngas conversion in this study. The performance of the reaction was influenced obviously by Mn content. The cobalt dispersion increased with the addition of Mn, whereas the reduction degree decreased after Mn doping. Then, the balance between the dispersion and reduction degree led to the change in CO uptake followed a volcanic curve. The catalyst with moderate amount of Mn (1 wt%) had the suitable cobalt particle size and the maximum CO uptake. Thus, the highest CO conversion was obtained over Co-1Mn/meso-ZSM-5 catalyst thanks to its maximum exposed active sites. The appropriate amount of Mn addition also resulted in the decreasing of CH 4 selectivity. The highest space time yield of liquid fuels was acquired over the Co-1Mn/meso-ZSM-5 catalyst from H 2 -deficient syngas conversion under the moderate conditions.
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高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 29
·10203-10211
·
IF 4.174
Shaobin Li,Jing Pan,Fengbo Li,Li Zhang,Dongfeng Chai,Zhuanfang Zhang,Jianjiao Xin
A simple continuous hydrothermal method was used to synthesize a NiFe2O4@Ni–Mn LDH/NF composite. The layered structure provides a large void to transfer the electron effectively, and the composite materials exhibit remarkable electrochemical performance including excellent specific capacitance (1265 F g−1 at 1 A g−1) and remarkable cycling stability (the specific capacitance remains at 80.9% after 5000 cycles). In addition, the asymmetric supercapacitor exhibits a high energy density of 96.2 W h kg−1 at a power density of 700 W kg−1, and there is an extraordinarily good cycling stability with a capacity retention rate of 92.5% after 4000 cycles. The outcomes indicate that the NiFe2O4@Ni–Mn LDH/NF composite electrode has potential application as a high-performance supercapacitor.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 36
·36933-36941
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IF 2.914
Chen Jun,He Jinjia,Wang Xiaoping,Hrynsphan Dzmitry,Wu Jiali,Chen Jianmeng,Yao Jiachao
Conversion of Fe II (EDTA)-NO or Fe III (EDTA) into Fe II (EDTA) is a key process in a wet flue gas denitrification technology with Fe II (EDTA) solution. In this work, the stoichiometry, kinetics, and thermodynamics of Fe II (EDTA)-NO reduction by Mn powder were investigated. We first studied the Fe II (EDTA)-NO reduction and product distribution to speculate a possible stoichiometry of Fe II (EDTA)-NO reduction by Mn powder. Then, the effects of major influencing factors, such as pH value, temperature, and Mn concentration, were studied. The pseudo-second-order model was established to describe the Fe II (EDTA)-NO reduction. Simultaneously, according to Arrhenius and Eyring-Polanyi equations, the reaction activation energy ( E a ), enthalpy of activation (∆ H ‡ ), and entropy of activation (∆ S ‡ ) were calculated as 23.68 kJ/mol, 21.148 kJ/mol, and − 149.728 J/(k mol), respectively. Additionally, simultaneous reduction of Fe III (EDTA) and Fe II (EDTA)-NO was investigated to better study the mechanism of Fe II (EDTA) regeneration, suggesting that there was a competition between the two reduction processes. Finally, a simple schematic mechanism of NO absorption by Fe II (EDTA) combined with regeneration of manganese ion and ammonium was proposed. These fundamental researches could offer a valuable guidance for wet flue gas denitrification technology with Fe II (EDTA) solution.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 11
·1-8
·
IF 2.009
Cao Sheng,Dai Chencheng,Zhao Jialong,Zou Bingsuo
In this work, a facile approach to synthesize the Ag- and Mn-codoped Zn-In-S nanocrystals (NCs) with dual emissions as ratiometric temperature sensors is reported. The as-synthesized codoped Zn-In-S NCs have a uniform size distribution and exhibit a zinc blende ZnS phase structure. Moreover, the as-produced codoped NCs show dual emission peaks which center at green and orange-red regions and have a photoluminescence quantum yield (PL QY) up to 45%. The time-resolved PL spectroscopy and X-ray photoelectron spectroscopy characterizations reveal that the dual emissions of these NCs are derived from the intrinsic emission of Ag + and Mn 2+ , respectively. Moreover, the relative intensity ratio of dual emissions can be tailored by adjusting the Ag and Mn doping concentrations. The as-built ratiometric temperature sensors based on the codoped NCs exhibit a thermometric sensitivity of ~ 0.17% K -1 over a broad window of 80–200 K, suggesting that these codoped Zn-In-S NCs are promisingly used for bio-optical ratiometric temperature sensing.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiaolan Zhou,Dong Xu,Yuancai Chen,Yongyou Hu
Mn/Fe@porous carbon (PC) was successfully fabricated through a simple carbonization of Mn-doped MIL-53(Fe) precursor and used as cathode modification in hydroxyl radical ( OH) based heterogeneous electro-Fenton (hetero-EF) process for triclosan (TCS) degradation. With co-doping of bimetal (Mn and Fe) in porous carbon, Mn/Fe@PC could markedly enhance the electrocatalysis with low oxygen reduction potential, high electrochemical active area and low resistance. Mn/Fe@PC modified cathode showed high electrocatalytic activity, great stability and low energy consumption (1.92 kWh m −1 and 0.63 kWh log −1 m −3 ) for TCS degradation over a wide pH range. The complete TCS degradation within 120 min and a 56.9 ± 2.0% TOC removal within 240 min were achieved under the condition of current 40 mA and initial pH 3. Based on the CV curves, the more negative reductive peak of Fe and Mn revealed the kinetically beneficial regeneration of Fe II /Mn II/III in Mn/Fe@PC. The electron transfer between Fe II/III and Mn II/III/IV , together with the direct regeneration of Fe II / Mn II/III on the cathode, could markedly promote the utilization of H 2 O 2, eventually leading to facilitating TCS degradation. According to the GC–MS intermediates, the possible TCS degradation pathway was deduced, including hydroxylation and dehalogenation attacked by OH. Furthermore, the TCS degradation experiments were also performed in different water matrix including river water, tap water and municipal sewage, indicating the feasibility of the TCS degradation in actual waters with Mn/Fe@PC-CP cathode in hetero-EF process. The toxicity analysis indicated that the hetero-EF process could achieve the TCS degradation and toxicity reducing.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Nan Wang,Bin Han,Jianbo Wen,Mingwei Liu,Xinjun Li
A novel Mn-doped Fe 2 O 3 modified g-C 3 N 4 nanosheets composite has been prepared for overall water splitting. Structure characterizations reveal that the Mn are successfully doped in the Fe 2 O 3 nanoparticle and a close interface between g-C 3 N 4 and Mn-doped Fe 2 O 3 is obtained. The optimized FMC-10 photocatalyst has a H 2 evolution of 51 μmol h −1 . The improved photocatalytic performance can be ascribed to the synergy effect of both Mn-doped Fe 2 O 3 and g-C 3 N 4 . Doping Fe 2 O 3 with Mn promotes photo-induced charges and increases the charge transfer for the improved conductivity of the bulk Fe 2 O 3 , while favorable contacting with g-C 3 N 4 enhances the charge separation ability.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Haifeng Li,Sheng Su,Yan Peng,Linkang Wu,Kai Xu,Lijun Liu,Mengxia Qing,Song Hu,Yi Wang,Jun Xiang
High temperature sorbents for removing H2S comprising manganese oxide and Al2O3 support modified with La loadings were prepared with wet impregnation. The removal of H2S and the regeneration of sorbents were conducted at 850 °C to investigate the effect of the support modified with La on the desulfurization ability and durability of the Mn/La/Al2O3 sorbents. The fresh sorbent, first sulfide sorbent, and fourth regenerated sorbent were characterized by nitrogen isothermal adsorption, X-ray power diffraction, scanning electron microscopy, and H2 temperature-programmed reduction. The results showed that the highest initial breakthrough sulfur capacity (BSC) was obtained with Mn/0.78%La/Al2O3(M/0.78L), and the initial BSC decreased with increased La loadings due to the inhibiting of excessive La on the reaction between MnO and H2S. The BSC of sorbents with lower La loadings suffered more serious deactivation than MnxOy/Al2O3 during successive desulfurization–regeneration cycles, and the BSC durability of sorbents increased with an increase in La loadings and calcination temperature of La/Al2O3. Mn/4.83%La/Al2O3 with La/Al2O3 calcined at 900 °C (M/4.83H) had the best BSC durability, which was better than the BSC durability of MnxOy/Al2O3 (M) during several desulfurization–regeneration cycles. The characterization results showed that the structure of the M/4.83H sorbent was more stable than other sorbents. The M/4.83H sorbent derived the La(AlO3) phase, which could maintain the structural stability of the sorbent during several desulfurization–regeneration cycles. The formation of the LaAlO3 phase may inhibit MnxOy from dissolving into Al2O3, which was beneficial for the durability of sorbents during several successive desulfurization–regeneration cycles.
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