CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Jiangkun Du,Jianguo Bao,Ying Liu,Sang Hoon Kim,Dionysios D. Dionysiou
Metal oxides are potentially interesting catalysts for activating peroxymonosulfate (PMS) for the degradation of recalcitrant contaminants. This study presents a magnetic porous Mn-Fe binary oxide (p-Mn/Fe 3 O 4 ) in micron-size with abundant micro- and meso- pores. This novel catalyst exhibited high efficacy and long-term stability in activating PMS for degradation of bisphenol A (BPA). Sulfate radicals and hydroxyl radicals were identified from catalytic PMS activation according to electron paramagnetic resonance (EPR) characterization. The effects of Fe/Mn ratio, catalyst dose, initial pH and temperature were investigated. Compared to monometallic oxides, p-Mn/Fe 3 O 4 exhibited a better catalytic performance because of the significant synergy between Mn and Fe species. Several BPA intermediates were identified. On the basis of bio-toxicity assay and TOC measurements, BPA transformed to some toxic intermediates during the initial reaction stage, and then decomposed efficiently to low toxicity products and mineralized to carbon dioxide and water molecules. This study shows that p-Mn/Fe 3 O 4 is an efficient and environmentally benign catalyst for PMS oxidation of organic pollutants.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 101
·期 12
·6807-6816
·
IF 2.1
Renjie Deng,Wenjin Ni,Yao Tian
Bimetallic cerium-manganese modified Hβ zeolite sample (Ce/Mn-Hβ) was prepared by ultrasonic assisted impregnation method and applied in nitration of toluene. The characterization results show that the active components (Ce and Mn) are successfully introduced into the framework of Hβ zeolite. The catalyst shows excellent catalytic activity and reusability for the nitration of toluene, giving high para selectivity. Under optimized conditions, it gives 68.7% selectivity to para -nitrotoluene at 88.6% conversion over Ce/Mn-Hβ in the presence of acetic anhydride (Ac 2 O). The theoretical calculations indicate that the Ce/Mn bimetallic active sites in modified Hβ zeolite can easily activate the nitrification reagent (AcONO 2 ), and the enhancement of para selectivity is owing to the steric hindrance of catalyst. Furthermore, the reaction mechanism was proposed by the combination of experimental results and theoretical calculations.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 43
·22763-22772
·
IF 11.301
Jiaxi Xue,Yajing Wang,Cui Sun,Pan Xu,Xiaoxiang Fan,Jingmin Fan,Mingsen Zheng,Quanfeng Dong
Li-rich Mn-based materials, as high-energy-density and low-cost cathode materials for Li-ion batteries, suffer severe irreversible voltage fading and capacity loss during cycling, associated with the instability of crystal structure at high voltage, which greatly reduces the specific energy density after cycling and thus impedes their commercialization. Here, we introduce a new strategy to mitigate voltage fading and improve the cycling performance of Li-rich Mn-based cathode materials by simply introducing MgSO4 in the cathode during its preparation process. The results show that cycling stability and voltage fading of corresponding batteries were dramatically improved due to the high Li+ retention at the initial charge process and the stable cathode electrolyte interface (CEI) layer. After 100 cycles at 1C, the average discharge voltage decay is only 0.115 V (1.15 mV per cycle), with a high voltage retention of 96.7%, and the capacity remains at 91.5% after 300 cycles at 1C.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Chunhao Wang,Haipeng Chen,Jian Deng,Liqing Li,Zheng Zeng,Xiancheng Ma,Siyu Wei
Exploring the single relationship between the inversion degree of spinel and its catalytic performance is a great challenge, but has important significance for further structural design and application. A series of CoMn inverse spinels were prepared and the general formula Co 1 - x 2 + Co x 3+ tet Mn 1 3+ Co x 2+ Co 1 - x 3+ oct O 4 was deduced through X-ray diffraction refinement to find a decreased inversion degree x as calcination temperature rose. Catalytic oxidation of toluene showed that higher inversion degree (S-300 with x ≈ 0.95) can reach larger conversion rate (90 % at about 250 °C for 400 ppm toluene) with greater reaction stability (140 h). Density Functional Theory (DFT) calculations on density of states indicated its metallic nature, and found that the strength of O-p and Transition metal-d orbitals at Fermi energy is positively correlated to the inversion degree, meaning stronger electron migration ability. Along with the adsorption calculation analysis that lattice oxygen species are proved to work dominantly (S-300 with lowest adsorption energy but highest performance), this work uncovered a theoretical insight into inverse spinel oxide , to provide the possibility of elevated oxidation ability through structural control.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Junyu Zhao,Qiang Zhang,Jingying Huang,Haoyu Zhang,Chunyu Chi,Penghui Xie,Hongshun Hao,Shuang Yan
The intrinsic property of WO 3 determines that it has stronger interaction with triethylamine (TEA), which makes the WO 3 sensing material to be an ideal TEA detector. In order to further improve the sensing performance of WO 3 gas sensors, a novel synthesis and modification method was proposed to fabricate Mn-doped WO 3 nanostructure. The unique structure of Mn/WO 3 was assembled by ultrathin nanosheets into hierarchical hollow fibers. Compared with the pristine WO 3 with similar structure, the Mn/WO 3 gas sensor shows greatly enhanced TEA sensing properties. The improvement of gas sensing performance of Mn/WO 3 should be due to the increase of oxygen vacancies and surface adsorbed oxygen after doping of Mn. Under the optimized preparing conditions, the Mn/WO 3 -500 sensor exhibits high sensing response (32 towards 50 ppm TEA), excellent selectivity, fast response-recovery speed and reliable repeatability and long-term stability at its optimal working temperature of 200 ℃. The superior TEA sensing performance of the Mn/WO 3 -500 sensor opens the door for potential applications in TEA recognition and detection.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Tongxin Han,Xiaofang Zhang,Tao Wei,Shifeng Huang,Yu Huan
The Pb(Mg 1/3 Nb 2/3 ) y (Zr x Ti 1- x )O 3 ternary piezoelectric ceramics have a high Curie temperature ( T c > 300 °C). However, their piezoelectric properties are low, which limits their sensitivity in practical applications. In this work, MnCO 3 is added to the Pb 0.94 Sr 0.06 (Mg 1/3 Nb 2/3 ) 0.2 (Zr 0.388 Ti 0.412 )O 3 piezoelectric matrix to enhance the piezoelectric response. Through the synergistic effect of optimizing morphotropic phase boundary, facilitating grain growth, reducing oxygen vacancy concentration, impressively excellent piezoelectric properties with piezoelectric coefficient d 33 = 708 pC/N, electromechanical coupling factor k p = 74 % and dielectric constant ε r = 3558 are obtained when MnCO 3 is added at 0.4 wt percent relative to the matrix. In the meantime, the composition possesses a high T c = 292 °C, and an exceptional temperature insensitivity ( d 33 with variations less than 10 % during the measurement temperature from 25 °C to 250 °C). Finally, when fabricated into piezoelectric transducers, the optimized component produces a significant voltage output, this indicates its outstanding application potential. This work demonstrates that Mn additives can significantly enhance the overall electrical properties of lead-based piezoelectric ceramics and accelerate their practical application.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xiu Li,Zhanheng Yan,Yanglin Shen,Wanjin Liu,Jun Ding
Oxides with the ABO 3 chemical formula play a crucial role in studying photostriction in inorganic materials. In this study, the photostrictive behavior of ilmenite-type ceramics ATiO 3 (where A = Mg, Fe, Co, Ni, and Mn) was investigated under visible light irradiation. Among the ceramics investigated, CoTiO 3 showed the highest photostriction of approximately 0.1 % under 405, 520, and 650 nm light irradiation. The photostrictive response decreased successively in FeTiO 3 , MnTiO 3 , NiTiO 3 , and MgTiO 3 . Temperature and thermal expansion tests revealed that the deformation of the ceramics caused by the photothermal effect accounted for approximately half of their photostriction. Raman and charge transfer analyses indicated that the photostriction of the ceramics depended significantly on their crystal structure. Thus, the ceramics exhibited distinct photostrictive performances. This study highlights the connection between the crystal structure and photostrictive performance of ilmenite-type ceramics, providing valuable insights into the underlying mechanism of photostriction in inorganic materials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Thao Pham Manh,Dinh Son Le,Ky Nguyen Van,Lan Ngo Thi,Tien Phat Doan,Dinh Thao Vu,Tuan Nguyen Van,Thu Hoa Nguyen Thi,Nguyen Vo Anh Duy,Minh Triet Dang,Nguyen To Van
s The present study demonstrates a successful synthesis of manganese-doped nickel cobalt sulfides (Mn-NiCo 2 S 4 ), which deliver marked improvements in electrochemical properties compared to pristine NiCo 2 S 4 . Comprehensive structural, morphological, compositional, surface, and electronic characterizations provide clear insights into the enhanced performance. Specifically, we identify three primary factors contributing to the superior electrochemical behaviors of Mn-NiCo 2 S 4 : ( i ) the appearance of hollow nanorods, which facilitates electrolyte access and improves ionic transport; ( ii ) the synergistic effects arising from the Faradaic reactions, which play a crucial role in boosting the electrochemical performance of Mn-NiCo 2 S 4 compared to the unmodified NiCo 2 S 4 ; and ( iii ) the enhances electronic conductivity from increased electron density and effective charge redistribution due to Mn doping confirmed by density functional theory simulations and experimental observations, leading to reduced internal resistance and improved electrochemical kinetics. Remarkably, Mn-NiCo 2 S 4 achieves an exceptional specific capacity of 470 C g -1 at a current density of 1 A g -1 . Additionally, the Mn-NiCo 2 S 4 //AC asymmetric supercapacitor delivers impressive energy densities ranging from 37.09 to 84.85 Wh kg -1 , corresponding to power densities decreasing from 7.09 to 0.79 kW kg -1 ; maintaining 50.52% capacity retention after 10,000 cycles at 2 mA cm -2 . These results underscore the potential of Mn-NiCo 2 S 4 and related doped materials as next-generation electrodes for advanced, high-performance supercapacitors, paving the way for significant advancements in energy storage technology.
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ENVIRONMENTAL TECHNOLOGY
·
2020
·
IF 2.213
Liang Xu,Fenglian Fu,Peijing Yu,Guangzhao Sun
To efficiently treat hexavalent chromium (Cr(VI)) wastewater, K2FeO4 was used to remove and reduce Cr(VI) in presence of Mn(II) in this paper. Batch removal experiments were carried out to study the effect of Fe/Mn molar ratios, initial pH, in-situ and ex-situ and co-existing ions on Cr(VI) removal. The results showed the removal efficiency of Cr(VI) was 97.7% for the initial Cr(VI) concentration of 10.0 mg/L at Fe/Mn molar ratio of 2:3 and initial pH 8.0. Meanwhile, the high removal efficiency of Cr(VI) had been maintained throughout the pH range of 3.0–8.0 in the experimental study. Moreover, the removal process was relatively stable regardless of in-situ and ex-situ, and co-existing ions such as Ca2+ and low concentration of HCO3− had no intense effect on Cr(VI) removal, while SO42− inhibited Cr(VI) removal in the reaction system. To investigate the removal mechanism of Cr(VI) by K2FeO4 in presence of Mn(II), the reaction products were characterized by the Fourier transformed infrared spectrometer, X-ray powder diffraction, Transmission electron microscopy and the high-resolution X-ray photoelectron spectroscopy. The results indicated the ferrate decomposition products of γ-FeOOH/γ-Fe2O3 had the ability to adsorb Cr(VI) and react with Mn(II) to form γ-Fe2O3-Mn(II) complex to adsorb and reduce Cr(VI).
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Shaokun Chong,Yifang Wu,Yuanzhen Chen,Shengwu Guo,Zige Tai,Chengyong Shu,Qiang Tan,Junjie Sun,Yongning Liu
Potassium-ion batteries (KIBs) are regarded as potentially promising large-scale energy storage (EES) systems due to the close redox potential to lithium, the rich reserve and low cost of potassium resources. Nevertheless, the larger ionic radius of K-ion makes cathode materials for KIBs be a difficult issue. Herein, we construct Mn-based layered oxide (K 0.32 MnO 2 ) microsphere , self-assembled by ultrathin nanosheets , as potential cathode electrode for nonaqueous KIBs, which delivers a reversible discharge capacity of 95.1 mAh·g −1 at 10 mA g −1 . It is demonstrated that K 0.32 MnO 2 undergoes a simple solid solution reaction mechanism for K-ions deintercalation/intercalation during the initial charge-discharge process, which is not like complex multiple processes accompanied by phase transition for Mn-based layered oxide particles . Ex situ measurements reveal that K 0.32 MnO 2 nanosheets can provide outstanding morphology and structure stability, as well as fast electrochemical kinetics upon cycling, thus high rate capacity, improved cycling lifetime and voltage stability at low and high rates can be obtained. We also verify the practical feasibility of K-ion full cell with commercial super P carbon black anode. This novel work illuminates the electrochemical mechanism for K-ions storage in depth, which may push the study on layered oxide cathodes and accelerate the development of KIBs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Lingqian Ye,Hao Fu,Ruirui Cao,Jun Yang
Prussian Blue analogs (PBAs) are a suitable aqueous zinc-ion batteries (AZIBs) cathode material, but they face issues related to low specific capacity and cycling lifespan due to insufficient active sites and poor ion de-intercalation structural stability. In this study, Mn-Prussian Blue Analog (Mn-PBA) is fabricated using a simple co-precipitation method and the morphology of Mn-PBA is further optimized through artificially manipulating concentration gradients strategy, effectively enhancing the structural stability of Zn 2+ de-intercalation. Furthermore, the introduction of Mn established dual Zn 2+ active centers in Mn-PBA (Mn-O and Fe(CN) 6 ] 4− /[Fe(CN) 6 ] 3− ), leading to an increased specific capacity. As a proof of concept for AZIBs, the optimized Mn-PBA-3 cathode exhibits a high reversible specific capacity of 143.5 mAh/g and maintains a capacity retention of 88.5 % after 250 cycles at 1 A/g, surpassing commercial MnO 2 (30.5 mAh/g after 100 cycles). Mn-PBA-3 also delivers a high capacity of 79.0 mA h g −1 after 2000 cycles of 10 A/g. The mechanism of the Zn 2+ double redox reaction of Mn-PBA-3 has been revealed in detail by in situ Raman and a series of ex situ techniques. Under a high operating voltage window of 0–1.9 V, Zn//Mn-PBA-3 demonstrates a capacity of 99.3 mAh/g after 800 cycles (5 A/g) by assembling zinc ion button battery. This work has reference significance for structurally modulated PBAs used in high performance AZIBs.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Feng Wang,Meiqi Zheng,Xiyan Zheng,Peng Liu,Daosheng Liu,Jiageng Liu,Shankui Wei,Chun Wang,Yongdong Liu,Jianqiu Deng
Due to the remarkable high energy density and high operating voltage, lithium-rich layered oxides (LLOs) are emerging as one of the most promising candidates for high-specific-energy cathode materials . However, the poor cycling stability and severe voltage degradation are key barriers, which limit their practical application. In this paper, Bi 2 O 3 modified Li 1.2 Mn 0.6 Ni 0.2 O 2 (LMO@BO) is developed to address these challenges. The uniform and dense coating is constructed on the surface of LMO, which utilizes number of oxygen vacancies in its crystal structure to mediate the release of O 2 and mitigate the irreversible loss of lattice oxygen, further suppress the phase transformation during the cycling process. Specifically, the specific discharge capacity of the LMO@BO cathode maintains 197.9 mAh g −1 at 1C with capacity retention rate of 96.3 % after 200 cycles(vs. unmodified LMO with capacity of 147.5 mAh g −1 and retention rate of 80.1 %. Meanwhile, a small amount of Bi 3+ is doped into the bulk phase to broaden the Li + migration channel, resulting in an efficient Li + diffusion. Overall, Bi 2 O 3 modified LMO sample is conducive to meeting the requirements of high energy density for lithium-ion batteries applications.
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