ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Xue Wang,Futing Wen,Liu He,Jiangyu Su,Ping Jiang,Daiping He
Defects engineering as an effective strategy was widely utilized to modulate catalytic performance for heterogeneous catalysts through tuning surface electronic surface and creating more active sites. In this work, porous Co–Mn oxide nanosheets with abundant oxygen vacancies (OVs-CMO NSs) were prepared via a simple “one-stone-two-birds” method. OVs were verified by various characterizations and found more favorable for O 2 absorption and activation to produce more reactive O2•- radical, resulting in an improved oxidase-like activity in initiating 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation , with a lower K m value of 0.00717 mM and a higher V max of 2.086 × 10 −7 M/s. Since heparin (Hep) shows an inhibition effect on OVs-CMO NSs-TMB chromogenic system due to strong absorption, a colorimetric sensing platform for Hep detection was established. The present colorimetric detection shows high sensitivity, good selectivity and reliability for normal goat serum. This work not only provides a high-performance non-precious metal oxidase mimic prepared by simple surface defect engineering, but also builds a sensitive colorimetric method for Hep detection.
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高影响因子
ACS Omega
·
2022
·
IF 4.132
Qingxiang Wang,Tao Huang,Jing Du,Lulu Zhou
The extraction of uranium (U)-related minerals from raw ore sands via a leaching procedure would produce enormous amounts of tailings, not only causing radioactivity contamination to surroundings but also wasting the potential U utilization. Effective recycling of U from U tailings is propitious to the current issues in U mining industries. In this study, the influence of the composite oxidation of Fe(III) and Mn(VII) intensified by microwave (MW) irradiation on the acid leaching of U from tailings was comprehensively explored in sequential and coupling systems. The U leaching activities from the tailing specimens were explicitly enhanced by MW irradiation. The composite oxidation caused by Fe(III) and Mn(VII) further facilitated the leaching of U ions from the tailing under MW irradiation in two systems. Maximum leaching efficiencies of 84.61, 80.56, and 92.95% for U ions were achieved in the Fe(III)-, Mn(VII)-, and Fe(III)–Mn(VII)-participated coupling systems, respectively. The inappropriateness of the shrinking core model (SCM) demonstrated by the linear fittings and analysis of variance (ANOVA) for the two systems explained a reverse increase of solid cores in the later stage of leaching experiments. The internal migration of oxidant ions into the particle cores enhanced by MW accelerated the dissolution of Al, Fe, and Mn constituents under acidic conditions, which further strengthened U extraction from tailing specimens.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Kangning Wang,Mengran Qin,Chuantao Wang,Ting Yan,Yanzhong Zhen,Xiaolei Sun,Jianwei Wang,Feng Fu
The construction of composite materials is an effective strategy to solve the problems of poor conductivity, manganese dissolution, and volume expansion of manganese-based materials. Herein, a CeO 2 /MnO x @C hollow composite cathode derived from the self-assembly of Ce-Mn-metal-organic frameworks (Ce-Mn-MOFs) was synthesized. The abundant oxygen vacancies and good electronic/ionic conductivity of CeO 2 improve the electrical conductivity of composite, enhancing the rate performance. The unique hollow structure could inhibit manganese dissolution and alleviate volume expansion. The results indicate that the 1 % CeO 2 /MnO x @C composite cathode possesses a high reversible capacity and excellent cycling stability. Specifically, the 1 % CeO 2 /MnO x @C composite cathode shows a remarkable reversible specific capacity of 130 mAh/g at a current density of 500 mA g −1 , 6.5 times more than the pure MnO x (20 mAh/g). The capacity retention is up to 99.5 % relative to the initial capacity after 800 cycles. This study provides a new strategy for designing rare-earth composite electrodes to improve electrochemical performance.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Mingjie Huang,Sisi Peng,Wei Xiang,Chen Wang,Xiaohui Wu,Juan Mao,Tao Zhou
This study has revealed how the strong metal-support interaction (SMSI) between carbon nanotubes (CNTs) and Mn 0.65 Fe 2.35 O 4 (MnFeO) in boosting peroxymonosulfate (PMS) activation for rapid sulfamethoxazole (SMX) degradation. As synergized by CNTs, the PMS-activation efficiency of MnFeO could be enhanced by>24 times, but with the similar PMS-activation mechanism. It was explored that the SMSI-induced abundant surface hydroxyl groups, in cooperation with the highly hydrophobic CNTs, favored the rapid in situ interfacial degradation of SMX. This feature also endowed the MnFeO-CNTs catalyst resistance to high salinity waters containing inorganic anions (e.g., Cl - and NO 3 – ) of weak complexing abilities. Moreover, the SMSI allowed the greatly accelerated redox cycle rate of Mn species by electron-rich CNTs, resulting in efficient PMS activation. Furthermore, the application feasibility of the MnFeO-CNTs/PMS system was demonstrated for a SMX-spiked real reverse osmosis (RO) concentrate. It was found that higher concentration of PMS could realize the complete removal of SMX, despite the existence of electron-rich tyrosine-like substances would compete with the SMX degradation in the MnFeO-CNTs/PMS system. This study demonstrated that the SMSI could boost the PMS activation , and could serve as an effective material strategy for in situ interfacial organics degradation in the high salinity wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Li Li,Qian Zhang,Yuecheng She,Yongbo Yu,Junming Hong
Mn–Fe bimetal catalyst possesses excellent activation properties, and the enhancement of Mn/Fe redox cycle for electron transfer is related to the crystalline structure and surface functional groups. Therefore, material structure optimization is an effective strategy to improve its activation performance in advanced oxidation . In this study, Mn–Fe LDO catalyst with strong Mn/Fe synergistic effect was synthesized, and used for bisphenol A degradation. Under the condition of 0.4 g/L Mn-Fe LDO, 1.5 mM PMS and pH 7.0, Mn-Fe LDO/PMS system exhibited excellent degradation performance that 100% of BPA (20 mg/L) and 72.0% of COD could effective be degraded within 50 min. Five-run recycle and metal ions leaching experiments proved the excellent reusability and stability of Mn-Fe LDO. To deepen the understanding of catalytic mechanism, the synergistic effect and electron transfer between Mn and Fe were confirmed via XPS and CVs results. Moreover, the indispensable role of surface hydroxyl groups were clarified via phosphate masking experiment, ATR-FTIR and LSV analysis. The presence of Mn and Fe active sites and hydroxyl groups on Mn-Fe LDO surface could efficiently promote electron transfer, thus accelerating the redox cycles of Mn 3+ /Mn 2+ and Fe 3+ /Fe 2+ . The generation of SO 4 ·− and HO· as the main radicals was occurred on the surface of Mn-Fe LDO, and SO 4 ·− played a major role during the reaction. On the basis of these experimental conclusions, the mechanisms of Mn–Fe LDO/PMS system for high-efficiency BPA degradation were proposed. GC-MS analysis was performed to detect the BPA degradation intermediates and propose the possible degradation pathways.
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RSC Advances
·
2021
·Vol. 11
·期 6
·3371-3379
·
IF 3.361
Zesheng Chen,Kun-huan He,Runzhi Wei,Yiju Lv,Zheng Liu,Guo-Cheng Han
A new metal–organic framework (MOF) compound [Mn2(2,2′-bca)2(H2O)2]n (Mn-MOFs) was successfully synthesized by solvothermal method, and Mn-MOFs@Zn material was prepared by loading zinc phosphate onto Mn-MOFs by ball milling, then Mn-MOFs@Zn was added to the water-based acrylic paint to prepare Mn-MOFs@Zn@acrylic coating. The AC impedance test results showed Mn-MOFs@Zn@acrylic coating has higher corrosion inhibition performance and stability to mild steel when compared with blank coating. The impedance modulus of the blank coating in the low frequency region decreased by 90%, and the Rct showed a trend of first increasing and then decreasing over time, the maximum Rct was only 303.8 Ω, which was only Mn-MOFs@Zn@acrylic coating one-seventh of the Rct value. The artificial scratch experiment showed that the Mn-MOFs@Zn@acrylic coating only slightly corrodes at the scratches, because Mn-MOFs@Zn material made the coating a self-repairing function and improved the durable anticorrosion performance of the acrylic coating.
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Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 4
·2292-2300
·
IF 11.301
Yafang Qi,Xiaoyue Zhao,Yao Liu,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yuena Meng,Sixin Wu
In Cu2ZnSn(S,Se)4 photovoltaic devices, the exceptionally high density of 2CuZn + SnZn donor defects may induce bandgap fluctuations and thus limit Voc and PCE enhancement. We have previously reported that the partial substitution of Ag for Cu in Cu2ZnSn(S,Se)4 provides a promising way to effectively suppress CuZn defects and considerably enhance the cell performance for Cu2ZnSn(S,Se)4 photovoltaic devices. However, the bandgap fluctuations and detrimental band tailing fundamentally still limit cell performance. On the basis of a Ag-substituted CZTSSe system, in this paper, we demonstrate that partially substituting Zn with Mn could be a feasible tactic to pronouncedly decrease the bandgap fluctuations and prevent detrimental band tailing. Our in-depth investigation reveals that Mn substitution could increase depletion width, decrease the defect densities of the CuZn acceptor and 2CuZn + SnZn donor, and enable grain boundary (GB) inversion in a (Cu,Ag)2ZnSn(S,Se)4-based cell. As a result, an impressive PCE of 11.81% was achieved when the Mn substitution level was 10%, with a Voc of 478 mV, a Jsc of 37.89 mA cm−2, and an FF of 65.23%. This is so far the highest efficiency among Mn-substituted CZTSSe-based photovoltaic devices. By thoroughly understanding these photoelectric properties of the CZTSSe-based photovoltaic devices, we believe that the breakthrough in device efficiency will come soon through our continuous efforts.
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Chemical Science
·
2021
·Vol. 12
·期 13
·4779-4788
·
IF 9.825
Yong Yang,Mehmed Z. Ertem,Lele Duan
The [fac-Mn(bpy)(CO)3Br] complex is capable of catalyzing the electrochemical reduction of CO2 to CO with high selectivity, moderate activity and large overpotential. Several attempts have been made to lower the overpotential and to enhance the catalytic activity of this complex by manipulating the second-coordination sphere of manganese and using relatively stronger acids to promote the protonation-first pathway. We report herein that the complex [fac-Mn(bpy-CONHMe)(CO)3(MeCN)]+ ([1-MeCN]+; bpy-CONHMe = N-methyl-(2,2′-bipyridine)-6-carboxamide) as a pre-catalyst could catalyze the electrochemical reduction of CO2 to CO with low overpotential and high activity and selectivity. Combined experimental and computational studies reveal that the amide NH group not only decreases the overpotential of the Mn catalyst by promoting the dimer and protonation-first pathways in the presence of H2O but also enhances the CO2 electroreduction activity by facilitating C–OH bond cleavage, making [1-MeCN]+ an efficient CO2 reduction pre-catalyst at low overpotential.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Wei Ding,Huaili Zheng,Yongjun Sun,Zhiwei Zhao,Xinyu Zheng,Yuyang Wu,Weilong Xiao
As(III) oxidation to As(V) is deemed necessary for better arsenic removal, and separation is still the optimal approach for water remediation from As(III). Herein, sulfite (SIV) was adopted to activate MnFe 2 O 4 for simultaneous oxidation and adsorption of As(III) in neutral water. The As(III) removal was more efficient than a peroxidation of As(III) followed by adsorption. The adsorption capacity of MnFe 2 O 4 /S(IV) for As(III) (26.257 mg g −1 ) was much higher than those of MnFe 2 O 4 alone for As(III) (9.491 mg g −1 ) and As(V) (9.142 mg g −1 ). The mechanistic study corroborated that intermediate Mn(III) was the dominant oxidant responsible for rapid oxidation of As(III), and the dual roles of S(IV) as a complexing ligand and a precursor of oxysulfur radicals accelerated the redox cycle of Mn(II)/Mn(III). Moreover, S(IV) enhanced arsenic adsorption by driving more production of monodentate complexes. As(III) can be effectively removed over a wide range of temperatures (283.15–313.15 K) and pH (3–10) with the optimal pH of 7. The effect of coexisting ions and reusability of MnFe 2 O 4 were also investigated. Especially, the superior performance of MnFe 2 O 4 /S(IV) for As(III) removal in various water matrixes may help develop new removal technologies based on active Mn(III) for the water decontamination from As(III).
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ADVANCED POWDER TECHNOLOGY
·
2019
·
IF 3.25
Lihua Gao,Zhenggen Liu,Yuzhu Pan,Cong Feng,Yang Ge,Mansheng Chu
Carbothermal reduction followed by magnetic separation has been recognized as an effective recovery strategy to achieve separation of Mn and Fe from ferruginous manganese ores (Fe-Mn ores). However, it is difficult to improve the recovery of manganese more than 85% by changing carbothermic roasting reduction and magnetic separation. This work clarified the underlying reason for the poor separation with the magnetic separation process and proposed a promising process for the recovery of Fe and Mn from Fe-Mn ore. The effect of operating variables on recovery and separation of Mn and Fe from Fe-Mn ore is initially investigated during the carbothermic reduction roasting process followed by magnetic separation to reveal the underlying reason for the poor separation from Fe-Mn ores. Then, the stepwise reduction behaviors of the MnO-Fe 2 O 3 and MnO-Fe 2 O 3 -Al 2 O 3 systems were investigated to clarify that the formation of composite oxide Mn 1−x Fe x O (0 < x < 0.497) and hercynite (FeO·Al 2 O 3 ) directly caused the poor separation of Fe and Mn from high-alumina Fe-Mn ores. Then, the stepwise reduction roasting behaviors of Mn 1−x Fe x O and FeO·Al 2 O 3 were investigated by XRD, SEM-EDS and XPS analysis. After adjusting the experimental parameters, iron-rich products with a Fe recovery of 94.31% and a grade of 85.21% and manganese-rich product with a Mn recovery of 90.05% and a grade of 54.35% are obtained. The mass ratio of Mn/Fe increased to 8.5 in the manganese-rich product.
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Materials Today Energy
·
2022
·
IF 9.257
Xianglei Liu,Changjian Yuan,Hangbin Zheng,Chao Song,Cheng Tian,Ke Gao,Nan Sun,Zhixing Jiang,Yimin Xuan,Yulong Ding
Calcium carbonate (CaCO 3 ) pellets are suitable for scalable solar thermochemical energy storage but suffer from low solar absorptance, poor stability, and slow reaction kinetics, which lead to low solar energy storage efficiency. Here, for the first time, we successfully achieve fast and efficient solar thermochemical energy storage via synergistically employing Al, Mn, and Fe stabilizers for improving both cyclic stability and solar absorptance, and Li 2 CO 3 promoters for accelerating decomposition of CaCO 3 pellets. The average solar absorptance is 1500% higher than that of pure CaCO 3 pellets. After 60 cycles, the energy storage density is still as high as 1671 kJ/kg with a decay rate of only 4.14%, in stark contrast to energy density of 1121 kJ/kg and decay rate of 56.73% for pure CaCO 3 pellets. The average decomposition rate is about twice as fast as that of pure CaCO 3 pellets due to enhanced Ca 2+ diffusion by doped Li 2 CO 3 . Under direct light irradiation, novel CaCO 3 pellets demonstrate high energy storage rate due to both high solar absorptance and fast decomposition rate, while pure CaCO 3 pellets cannot even reach the decomposition temperature. This work opens new opportunities for scalable deployment of direct solar-driven thermochemical energy storage techniques based on Li 2 CO 3 -doped dark CaCO 3 pellets.
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Laser & Photonics Reviews
·
2023
·
IF 11
Wen Li,Yunyun Li,Ying Wang,Zhengyang Zhou,Chao Wang,Yiyang Sun,Jianyong Sheng,Jiawen Xiao,Qian Wang,Shunsuke Kurosawa,Maksym Buryi,David John,Karin Paurová,Martin Nikl,Xiaoping OuYang,Yuntao Wu
The urgency for cost-effective, high-resolution, flexible X-ray imaging detectors is generating great demand for scintillators with low-temperature processability, high scintillation yield, and negligible afterglow. X-ray imaging materials are currently dominated by inorganic scintillators in the form of rigid films and bulk crystals, which have inherent limitations including high-temperature, complex synthesis, and considerable challenges toward advanced nonplanar imaging. Here, high-performance and flexible X-ray scintillators based on novel zero-dimensional (0D) (BTPP) 2 MnX 4 (BTPP = benzyltriphenylphosphonium; X = Cl, Br) halides are reported. They emit bright green light originating from the 4 T 1 - 6 A 1 transition of Mn 2+ under X-ray excitation. In particular, (BTPP) 2 MnBr 4 single crystals exhibit excellent air- and radiation-stability, a high scintillation yield of 53 000 photons MeV −1 , a low detection limit of 89.9 nGy air s −1 , and an ultralow afterglow comparable to commercial Bi 4 Ge 3 O 12 (BGO) single crystals. Moreover, the (BTPP) 2 MnCl 4 @polydimethylsiloxane (PDMS) flexible scintillation screens achieve a high spatial resolution of 14.1 lp mm −1 and realize high-quality imaging results of nonplanar objects. This study demonstrates that the flexible scintillation screens based on low-dimensional Mn(II) hybrid halides have significant potential for low-dose and high-resolution X-ray imaging applications.
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