MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Asim Mushtaq,Yike Hou,Cong Tian,Tianhao Deng,Changliang Xu,Zhichao Sun,Xiangdong Kong,M. Zubair Iqbal
Multifunctional magnetic photosynthesizer nanocomposites are highly desired to improve the efficacy of the early cancer diagnosis and therapy. However, design a highly biocompatible theranostic system with controlled size and shape at the nanoscale without altering the original properties of the primary materials is a challenging task. Herein, rhombic shaped manganese (Mn) doped titanium dioxide (TiO 2 ) nanocomposites are designed to enhance the generation of reactive oxygen species (ROS) by photocatalytic property and spin relaxation for MRI. Transmission electron microscopy (TEM) results revealed the average size of the synthesized Mn-TiO 2 rhombic nanocomposites (RNCs) was about 20–30 nm with homogeneous shape and dispersion. EDS and XPS analyses proved the incorporation of Mn ions into the anatase TiO 2 lattice. After Pluronic® F-68 surface modification, Mn-TiO 2 -PF-68 RNCs demonstrated negligible toxicity and physiological stability. Prepared fluorescein isothiocyanate (FITC) labeled RNCs are encapsulated by the plasma membrane and surrounded the nucleus of 4T1 mice breast cancer cells which improve the efficiency of prepared RNCs. In addition, the Mn 3+ ions remarkably enhanced the positive contrast (T 1 ) for magnetic resonance imaging (MRI) and presented significant r 1 relaxivity and low r 2 /r 1 relaxivity ratio. Finally, Mn 3+ doped with photosensitizers (TiO 2 ) also exhibited a great synergistic effect of photo-killing in vitro by developing hydroxyl radicals. Therefore, the as-prepared Mn–TiO 2 RNCs are promising candidate as a new kind of multifunctional agent for both MRI and PDT applications.
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 12
·期 3
·2022-2027
·
IF 6.97
Chao Peng,Huanhuan Xing,Yuan Xue,Jin Wang,Jing Li,Erkang Wang
Two-dimensional (2D) Mn–Fe layered double hydroxide (LDH) nanosheets are firstly examined to mediate an O-phenylenediamine (OPD) based fluorescent switch in the presence of ascorbic acid (AA). On one hand, Mn–Fe LDH mimicked the functions of oxidase to catalyze the oxidation of OPD to OPDox, emitting fluorescence at 565 nm. On the other hand, Mn–Fe LDH acts as a superior catalyst for the reaction between AA and OPD to generate 3-(1,2-dihydroxyethyl)furo[3,4-b]quinoxalin-1(3H)-one (N-heterocyclic compound) with an emergence of the maximum emission at 425 nm (ca. 6 fold). The presence of AA not only induces the enhanced emission at 425 nm from the N-heterocyclic compound, but also leads to decreased fluorescence at 565 nm due to the decomposition of Mn–Fe LDH nanosheets. On the basis of the reversed fluorescence response at 425 and 565 nm, ratiometric fluorescence sensing methods (ΔF425 nm/ΔF565 nm) are developed for the determination of AA. With the assistance of alkaline phosphatase (ALP), the activity of ALP can be monitored using the ratiometric platform based on the hydrolyzing ascorbic acid 2-phosphate to yield AA with the detection limit of 0.16 mU mL−1. Different from the traditional ratiometric sensing platform, where two fluorescent probes are often introduced, the present ratiometric system derived from one signal precursor holds great potential in developing a facile platform and broadens the application of 2D nanomaterials in the field of biology.
✓ 已验证
DOI
PubMed
高影响因子
IONICS
·
2022
·Vol. 28
·期 7
·3525-3536
·
IF 2.961
Lu Jingling,Xu Cunying,Li Jianru,Wang Shuxian,Xiang Qinqin,Chen Xiao,Hua Yixin,Li Yan
The effects of nicotinic acid (NA) on the electrodeposition of Al-Mn alloy have been investigated in aluminum chloride-1-butyl-3-methylimidazolium ionic liquids (AlCl 3 -BMIC) containing 0.15 mol·L −1 MnCl 2 (AlCl 3 -BMIC-MnCl 2 ). The electrochemical behaviors of the AlCl 3 -BMIC-MnCl 2 electrolyte have been studied here using cyclic voltammetry and potentiodynamic polarization. The addition of NA obviously increased the nucleation overpotential of Al-Mn alloy and inhibited the reduction reaction of Al(III) and Mn(II). The resultant surface morphologies, composition, and roughness of the Al-Mn alloy coating were revealed by scanning electron microscopy (SEM), transmission electron microscope (TEM), and atomic force microscopy (AFM). It was found that these additives strongly affect the morphology, composition, roughness, and crystal structure of the Al-Mn alloy coating. With the addition of NA, the content of Mn decreased, and Al-Mn alloy coatings became more uniform and smoother. The crystal structure of Al-Mn coatings was also examined by X-ray diffraction (XRD), where it was found that the phase composition of the deposits depends on the quantities of additives. For electrolyte containing little or no NA additives, the resulting alloy is amorphous structure. With NA additives up to 6·mmol L −1 , the Al-Mn coating changed into a mixture phase of amorphous and crystalline structure.
✓ 已验证
DOI
高影响因子
CORROSION
·
2023
·Vol. 79
·期 5
·486-496
·
IF 1.6
Zhao Yinghai,Li Wei,Wang Zhenwen,Li Ning,Xu Yanling,Li Deyu
In recent years, in the field of tinplate production, it has become a trend to use lower tin coating mass to lower production costs. However, the preparation of low Sn-coated steel must face two significant problems: toxic chromate post-treatment and low corrosion resistance. In this work, we developed an Mn-Al-P chemical conversion coating using a process sequence-adjusted tinplate of 0.5 g/m 2 tin coating mass as an alternative to the chromate treatment. Meanwhile, by adjusting the subsequence of the reflowing process and the post-treatment process, the wash water and electricity consumption were effectively reduced. The influence of reflowing time on the microstructural appearance, phase composition, surface element distribution, and corrosion resistance of this new brand tinplate was studied. Moreover, the composition was determined by x-ray photoelectron spectroscopy, and further discuss the formation mechanism of this coating. The results show that this mutielement coating could effectively fill tin-free zones on the surface of the tinplate and improve the corrosion resistance when the reflowing time is properly set up to 3.5 s after the process adjustment. However, continually extending the reflowing time would cause the phosphate coating to fall off, leading to the corrosion resistance deterioration. The coating was mainly made up of a series of amorphous phosphate compounds and metal oxides, which was suitable for a tinplate with low tin coating mass.
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Jiamin Huang,Guanghui Zhang,Jie Zhu,Mingrui Wang,Fanshu Ding,Chunshan Song,Xinwen Guo
The catalytic conversion of CO2 to higher alcohols (HAs, representing ethanol and alcohols with more than two carbon atoms) has been of great interest to mitigating the greenhouse effect and effectively utilizing CO2. However, most present catalysts have disadvantages of poor activity (conversion less than 30%) and selectivity (less than 10%) and high price. Herein, we report a Mn- and K-modified iron carbide catalyst that offers a CO2 conversion higher than 40% and a selectivity of higher alcohols exceeding 10%, and the proportion of propanol and butanol in alcohol products is more than 30%. Unpromoted iron carbide has a strong ability of hydrocarbon chain growth, leading to the fast formation of hydrocarbon products rather than HAs. However, on the Mn- and K-modified iron carbide catalyst, K is used to increase the surface C/H ratio of the catalyst by enhancing the adsorption of CO2 on the catalytic surface. The increased C/H ratio is indispensable to the formation of HAs, and the addition of Mn promoter dramatically improves the production of HAs, especially the formation of propanol and butanol. The synergistic effect between Mn and K on iron carbide is the key to produce HAs. In addition, the Mn- and K-modified iron carbide is of low cost, which can potentially provide an alternative for the hydrogenation of CO2 to produce valuable chemicals.
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2018
·
IF 0
Zhanao Lv,Cholho Choe,Yunfeng Wu,Haibin Wang,Zhuqi Chen,Guangxing Li,Guochuan Yin
This work demonstrates a novel strategy that the introduction of non-redox metal ions as Lewis acids to the classic dinuclear manganese complex [Mn IV 2 (μ-O) 3 (Me 3 tacn) 2 ](PF 6 ) 2 can greatly promote the alkene epoxidation efficiency under mild conditions with H 2 O 2 as the solely terminal oxidant because of its economic and environmental advantages. When [Mn IV 2 (μ-O) 3 (Me 3 tacn) 2 ](PF 6 ) 2 was used as the catalyst in the absence of Lewis acids, only 16.4% conversion of cyclooctene with 6.2% yield of epoxide was obtained and the obvious decomposition of H 2 O 2 was observed. However, the oxygen transfer efficiency of the catalyst was sharply improved with 100% conversion and 90.2% yield of epoxide under identical conditions when the non-redox metal ion, such as Sc 3+ , was introduced to the catalytic system. The novel strategy was successfully applied to the epoxidation reactions of different types of alkenes. Through UV–vis, FT-IR, EPR and CV characterizations, it was evidenced that the non-redox metal ions with high positive charge as Lewis acids could dissociate the sluggish dinuclear Mn-(μ-O) 3 -Mn core and the open-loop dinuclear manganese complex, HO-Mn III -(μ-O)-Mn IV = O or O = Mn IV -(μ-O)-Mn IV = O, was proposed as the active species, which was capable of the alkene epoxidation process. This work illustrated an alternative protocol to manipulate the reactivity of those sluggish catalysts by the introduction of non-redox metal ions and provided clues to understand the role of non-redox metal ions in metalloenzymes and heterogeneous catalysts.
✓ 已验证
DOI
Journal of Cleaner Production
·
2022
·
IF 11.072
Qin Guo,Chaoting Guan,Luna Luo,Zhen Wang,Hanping Pan,Jin Jiang
Fenton and Fenton-like systems have been successfully applied in treatment of refractory pollutants in water and wastewater, but the formation and disposal of large amounts of ferric sludge is a matter of concern. This study demonstrated that Mn(IV)/HSO 3 − system could effectively degrade atrazine (ATZ) through generation of Mn(III) and SO 4 •− as primary reactive intermediates and meanwhile the sludge could be well controlled. Mn(IV) could be in situ regenerated from oxidation of Mn(II) (i.e., Mn(IV) final transformation product in Mn(IV)/HSO 3 − system) by oxygen under alkaline condition, and was reused for efficiently catalyzing HSO 3 − to degrade ATZ. The metal ions (e.g., Ca(II), Mg(II), Zn(II) and Al(III)) commonly used as coagulant had negligible effects on ATZ degradation by Mn(IV)/HSO 3 − system. The oxidation products of ATZ were identified to further clarify the role of various reactive intermediates in Mn(IV)/HSO 3 − system. Deethyl-atrazine (DEA) and atrazine amide (CDIT) were two primary products during ATZ transformation by Mn(IV)/HSO 3 − system. The molar ratio of CDIT to DEA ([CDIT]/[DEA]) was quantified to be 3.0–4.0 during ATZ transformation by Mn(IV)/HSO 3 − system, which was much higher than those (∼2.3 and ∼0.7) obtained in the cases of authentic SO 4 •− and •OH oxidation (i.e., UV/PDS and UV/H 2 O 2 system), respectively. This result indicated that Mn(III) was a more selective reactive intermediate than SO 4 •− , which was also proved by tertiary butanol scavenging experiments. Based on these findings, the Mn(IV)/HSO 3 − system may be operated in a sequencing batch reactor (SBR) as a durable, efficient, and recyclable technology to treat recalcitrant contaminants in water and meanwhile to achieve ‘zero discharge’ of sludge.
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 51
·期 2
·553-561
·
IF 4.39
Dangli Gao,Kaiwei Ma,Peng Wang,Xiangyu Zhang,Qing Pang,Hong Xin,Zihan Zhang,Huan Jiao
Traditional fluorescent materials used in the anti-counterfeiting field usually exhibit monochromatic luminescence at a single-wavelength excitation, which is easily forged by sophisticated counterfeiters. In this work, Zn2GeO4:Mn,x%Li (x = 0 and 20), Zn2GeO4–NaLiGe4O9:Mn,x%Li (x = 50 and 70) and NaLiGe4O9:Mn micro-phosphors with multi-chromatic and multi-mode luminescence have been successfully synthesized via a hydrothermal approach followed by an annealing treatment. As expected these Li+ doped Zn2GeO4:Mn and Zn2GeO4–NaLiGe4O9:Mn phosphors exhibit a double peak emission including a long green afterglow (∼540 nm) and red photoluminescence (∼668 nm). By tuning Li+ doping concentrations, a gradual colour output and a tuneable afterglow duration are achieved. In particular, the Zn2GeO4:Mn,Li and NaLiGe4O9:Mn phosphors exhibit excellent performance as security inks for printing luminescent numbers and anti-counterfeiting patterns, which show an afterglow time-dependent or excitation wavelength-dependent luminescence colour evolution. This work proves the feasibility of the Li+ doping strategy in emission tuning, which can stimulate further studies on multi-mode luminescent materials for anti-counterfeiting applications.
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 11
·3526-3536
·
IF 4
Junxiang Zhou,Yudeng Wang,Bo Feng,Yong Sun,Jiafu Wang
Ternary transition metal oxides (TMOs) are potentially promising anode materials for lithium storage with high power and energy density. Designing appropriate electrode structures is an effective strategy to sufficiently exhibit the advantages of TMOs for lithium storage. Here, we present the synthetic process and electrochemical properties of carbon-coated mesoporous Ni–Mn–Co–O (NMCO) nanowire arrays (NWAs) grown on Ni foam as an integrated electrode for lithium-ion batteries (LIBs). The electrochemical measurements show that the carbon-coated NMCO integrated electrode exhibits high capacity and cycling properties. In addition, we have also developed an all one-dimensional (1D) structural full cell using an LiMn2O4 nanorod cathode and an NMCO/Ni NWAs@C-550 anode, which exhibits relatively outstanding cycling properties.
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 22
·23162-23172
·
IF 2.914
Yu Jie,Wang Hongjie,Ji Qinghua
In aquatic environment, the existence of antibiotics including sulfadiazine (SDZ) has gain a huge attention. It is suggested that hydrous metal oxides have large potential to remove contaminants in water. The SDZ removal capability by ferric and manganese binary oxides (FMBO) was investigated, and the SDZ removal performance was compared with the ferric hydroxide (HFO) and manganese dioxide (HMO). Our results showed that SDZ removal was highly pH-dependent, but pH has less effect on uptake of SDZ on FMBO than that of the other two adsorbents. The surface acidity constant of FMBO was first calculated to be 6.31 and 8.48, respectively. The uptake process was successfully fitted for according to surface complex formation models (SCFM) and the results of modern surface analytical methods, such as FTIR and XPS, were also consistent with the surface complex uptake mechanism. The uptake of SDZ by FMBO ascribed to specific chemical interaction between the aniline group of SDZ and the hydroxyl groups from FMBO.
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Ruya Chen,Yuan Zhuang,Ying Yu,Baoyou Shi
Particulate manganese oxide (MnOx) deposition in drinking water distribution systems (DWDS) gives rise to the risk of water discoloration at the consumers’ tap; however, its role in the fate and transport of trace organic pollutants in DWDS is not clear. Perfluorooctanoic acid (PFOA), a persistent organic pollutant frequently detected in natural water, was selected to investigate the potential effect of MnOx on its transportation behavior under DWDS conditions through laboratory batch experiments. The results show that PFOA can be greatly combined with MnOx formed in-situ through a Mn(II) oxidation process by free chlorine. However, the accumulation of PFOA by preformed MnOx was negligible. It was found that 1 mg/L Mn captured over 50% of PFOA with an initial concentration of 50 ng/L during oxidation. The water compositions of actual water could contribute to the effect of PFOA accumulation to a certain extent. Characterization of the solid products revealed that PFOA is homogenously embedded into MnOx. The combination of PFOA with MnOx occurs through a bridging effect of Mn(II) between the surface hydroxyls of MnOx and the -COOH group of PFOA. The resulting MnOx-PFOA particles were more inclined to agglomerate, enabling possibly easy deposition onto the pipe wall than ordinary MnOx particles. This study provides insights into the co-occurrence of metal deposits with PFOA and the potential risks posed by PFOA accumulation to consumers through the water distribution process.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yingying Xing,Di Li,Longhua Li,Huamei Tong,Deli Jiang,Weidong Shi
Electrocatalytic hydrogen evolution under alkaline media holds great promising in hydrogen energy production. Transition-metal sulfides (TMSs) are attractive for electrocatalytic alkaline hydrogen evolution, yet their catalytic performance is unsatisfactory owing to the sluggish water dissociation kinetics. Herein, a Mn/N co-doping strategy is proposed to regulate the water dissociation kinetics of Co 9 S 8 nanowires array grown on nickel foam thus improve the activity of hydrogen evolution reaction (HER). The optimal Mn/N co-doping Co 9 S 8 (Mn–N–Co 9 S 8 ) catalyst achieves low overpotentials of 102 and 238 mV at 10 and 100 mA cm −2 in the 1 M KOH solution, respectively, remarkably higher than the single-doping Mn–Co 9 S 8 and N–Co 9 S 8 as well as superior to many reported Co 9 S 8 -based HER electrocatalysts . Density functional theory (DFT) calculation results confirm that the water dissociation barrier of the Mn–N–Co 9 S 8 is reduced significantly owing to the synergistic co-doping of Mn and N, which accounts for the enhanced alkaline HER performance. This study offers an effective strategy to enhance the alkaline HER activity of TMSs by accelerating water dissociation kinetic via the cation and anion co-doping strategy.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）