JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hongyu Wang,Tao Wang,Gonghao Li,Bo Wu,Ruijun Gao
Balancing increased recoverable strain with high phase transformation temperature is crucial for Cu-Al-Mn SMAs to cost-effectively overcome the service temperature limitation (<100°C) of NiTi-based SMAs. This study fabricated four types of Cu-12.5Al-3Mn SMAs modified with nano-Al₂O₃ p (0, 0.5, 1.0, and 1.5 wt%) using wire arc additive manufacturing (WAAM) with cored wires. It investigated the effects of nano-Al₂O₃ p on shape memory properties, exploring mechanisms via microstructural, phase, and hardness analysis. Results show that adding an appropriate amount of nano-Al₂O₃ p significantly enhances memory performance while maintaining high martensite transformation temperatures. The 0.5 wt% nano-Al₂O₃ p modified alloy exhibited optimal properties: a shape recovery rate of 87.77 % (13.8 % higher than the base alloy) and a recoverable strain of 7.02 % (>40 % higher than the commonly reported 5 %) under 8 % bending pre-strain. Its Ms temperature remained above 100°C (As, Af, Mf were largely unchanged), and full recovery time was halved compared to the unmodified alloy. The enhancement is attributed to nano-Al₂O₃ p strengthening the parent phase and improving thermoelastic martensite order via pinning. Their high stability under WAAM's high-energy heat source minimizes impact on alloy composition, while dispersed particles create lattice distortion and stress fields, reducing the energy barrier for martensitic transformation.
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Water
·
2025
·
IF 4.3
Xuecong Qian,Luwei Li,Jinhao Duan,Shilong Wang,Yun Liu,Da Wang,Haijun Cheng,Jun Ma
In aqueous systems, Mn(II) oxidation by chlorine involves both electron and proton transfer. However, the slow proton transfer due to water molecule’s limited proton acceptance capacity leads to low Mn(II) oxidation efficiency under near-neutral conditions. Pyridine (pKa = 5.25), a strong proton acceptor, was selected to investigate electron–proton transfer principles in Mn(II) oxidation. Kinetic studies show that pyridine enhances Mn(II) oxidation efficiency by chlorine under neutral to alkaline conditions (pH 7.0–9.5), with maximal enhancement observed when pH approaches pyridine’s pKa. A high kinetic isotope effect (up to 6.9) and an E1/2-pH slope near the Nernstian value in cyclic voltammetry experiments confirm that pyridine induces a concerted electron–proton transfer (CEPT) pathway. Density functional theory calculations reveal that the pyridine-induced CEPT pathway is thermodynamically more favorable than stepwise electron transfer followed by proton transfer (ETPT) and proton transfer followed by electron transfer (PTET) pathways, explaining the enhanced oxidation efficiency. Similarly, in pyridine-free systems, increasing pH from 7.0 to 9.5 promotes Mn(II) oxidation efficiency through an OH–-mediated pathway switching from ETPT to PTET and CEPT pathways. This study demonstrates the controlling role of proton transfer in the Mn(II) oxidation process, providing theoretical guidance for the rational selection or design of Mn-removal catalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yesheng Fu,Huayu Chen,Zehao Wang,Dandan Yu,Junhui Liang,Yuexiang Huang,Ismaila Taiwo Bello,Gayi Nyongombe Ekambo,Mokhotjwa Simon Dhlamini,Da Chen
The development of efficient and stable electrocatalysts for the oxygen evolution reaction (OER) in acidic media remains a critical challenge. Here, we designed a hierarchical structure catalyst comprises of MnO 2 and carbon‑nitrogen compound (CN) coated MoO 2 (denoted as MoO 2 @CN/MnO 2 ), in which the Mn species is identified as the real active site for OER and the Mo-containing species (MoO 2 @CN) serves as the promoter. The incorporation of CN into the interface between the MoO 2 and MoO 2 facilitates the inner electron transfer from Mo to Mn, thereby increasing the quantity of Mn 3+ active sites for more efficient OER process, and at the meantime, the presence of CN effectively suppresses Mn dissolution during OER, stabilizing these active sites and improving the overall catalytic stability. The MoO 2 @CN/MnO 2 heterostructure exhibits decreases of 29 mV and 74 mV for the overpotential at 20 mA cm −2 compared with the MoO 2 /MnO 2 and the MnO 2 , and shows enhanced electrocatalytic stability. This work provides a promising and facile strategy for enriching and stabilizing the active species for acidic OER catalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Xiaolin Yue,Can Cui,Shaolin Deng,Lan Wang,Ping Li,Anhong Li,Yizhong Zhang,Rui Hao,Wenyuan Tan
Currently, Zeolitic imidazolate frameworks (ZIFs) face challenges in antibiotic adsorption due to their inherent difficulty in recovery and susceptibility to hydrolysis. To overcome these limitations, herein, Mn-doped ZIF-67 was synthesized via coordination modification and then electrospun with high-mechanical-strength polyvinylidene fluoride (PVDF) to produce Mn-ZIF-67@PVP/PVDF composite nanofiber membranes. Characterization results based on SEM, XRD, and FT-IR analyses demonstrate that the layered nanofiber membrane provides abundant attachment sites for Mn-ZIF-67. Antibiotic adsorption experiments further reveal that the composite membrane exhibits facile recyclability, with Mn-ZIF-67 retaining 80 % of its initial adsorption capacity after five consecutive cycles, while maintaining its crystalline structure and remarkable aqueous stability throughout repeated utilization. The composite membrane achieved maximum adsorption capacities of 583.43 mg/g for tetracycline (TC) and 122.42 mg/g for ciprofloxacin (CIP). The adsorption process followed pseudo-first-order kinetics and Langmuir isotherm models, while thermodynamic analysis revealed a spontaneous and endothermic nature. The adsorption performance showed minimal impact from coexisting ions and pH variations. These superior characteristics of enhanced adsorption performance, exceptional water stability, and convenient recoverability endow the Mn-ZIF-67@PVP/PVDF composite membrane with significant practical advantages over conventional ZIF materials for antibiotic removal applications.
✓ 已验证
产品关联
DOI
高影响因子
POLYHEDRON
·
2024
·
IF 2.4
Wei Sun,Xue-Lu Hao,Wen-Qian Zhang,Zhen-Nan Li,Dong-Fang Zhang,Li Xu,Yi-Fan Kang
N -Oxide-functional isonicotinic acid N -Oxide (HINO) ligand has been selected to construct functional metal–organic frameworks (MOFs). And based on HINO ligand and Mn(Ⅱ) center, a novel N -Oxide-functional three-dimensional (3D) pillared microporous Mn(Ⅱ)-MOF, [Mn(INO) 2 ·CH 3 OH] n ( 1 ), has been constructed. MOF 1 has been characterized by single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), thermogravimetric analyses (TGA), elemental analyses (EA) and infrared spectroscopy (IR). Structural analysis reveal that in MOF 1 , the N -Oxide group and carboxylic group of INO ligand connect Mn(Ⅱ) centers to form a one-dimensional (1D) Mn-O chain, and then the 1D chains are supported by INO ligands with two types of coordination modes to generate its 3D pillared microporous framework. Given the 1D Mn-O chains in MOF 1 , magnetic susceptibility measurements have been conducted, which show antiferromagnetic exchange interactions between Mn(Ⅱ) centers in the Mn-O chain. Given the porosity of MOF 1 and the N -Oxide sites and vacant carboxylic O sites on its pore surfaces, gas adsorption experiments of MOF 1 have been investigated by N 2 , CH 4 and CO 2 gases. MOF 1 displays good adsorption capacity, affinity and selectivity of CO 2 over CH 4 and N 2 , indicating its potential application in postcombustion CO 2 capture and gas separation.
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Zhiwen Wang,Zhenping Qiu,Chaojie Zhao,Zheng Pan,Guangxia Wang,Yue Guo
As demand for high-energy-density batteries grows, cobalt-free ultra-high‑nickel cathodes like LiNiO₂ are poised to revolutionize next-generation energy storage solutions. However, their practical use is hindered by structural degradation caused by phase transitions, oxygen loss, and detrimental interfacial reactions triggered by the strong oxidizing nature of Ni 4+ formed under high voltage, which together lead to rapid capacity degradation and poor cycling stability. To overcome these challenges, effective doping strategies are crucial. This study systematically examines the potential of Mn and Al doping to enhance the stability of LiNiO₂ using in situ XRD, TEM, XPS, and electrochemical testing. The results show that, while both Mn and Al doping enhance structural stability and cycling performance, they operate through different mechanisms. In particular, 4 mol% Al doping remarkably suppresses c-axis expansion, enhances phase transition reversibility, and achieves capacity retention of 84.8 % after 100 cycles at 1C. In contrast, LiNiO₂ exhibits good tolerance toward Mn doping up to 10 mol%, which helps mitigate structural degradation; however, the capacity retention remains moderate at 80.3 %. While Al doping primarily enhances electrochemical performance, Mn doping contributes to preserving the structural integrity of the cathode at higher concentrations. Our study reveals their complementary roles, providing a strategy to address structural challenges and advance sustainable cobalt-free energy storage solutions.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Tingting Tang,Yanfang Teng,Kuoteng Sun,Yanhan Liu,Zhendong Gao,Tayirjan Taylor Isimjan,Jingya Guo,Jianniao Tian,Xiulin Yang
Crystalline and amorphous catalysts offer disparate advantages in reducing the overpotential of the oxygen evolution reaction (OER). Crystalline phases provide excellent electrical conductivity, while amorphous phases offer abundant unsaturated active sites. This study explores a synergistic strategy that integrates these benefits to develop high-performance OER catalysts with enhanced activity and stability. By employing controlled annealing followed by phosphating, we engineered a transition from low-crystallinity MnP–Co3P/NF to high-crystallinity MnP–Co3(PO4)2/NF, effectively tuning the balance between conductivity and active site availability. Advanced spectroscopic characterization studies (including X-ray photoelectron spectroscopy (XPS), zeta potential analysis, ultraviolet photoelectron spectroscopy (UPS) and electrochemical measurements) reveal that the high-crystallinity MnP–Co3(PO4)2/NF catalyst exhibits superior hydrophilicity, an enriched concentration of phosphorus vacancies, and enhanced charge redistribution, collectively leading to significantly improved OER kinetics. The catalyst achieved low overpotentials of 281 mV at 50 mA cm−2 and 306 mV at 100 mA cm−2, with exceptional stability for 230 h at 100 mA cm−2, outperforming comparable systems and commercial noble metal catalysts. In situ studies revealed faster formation of the active CoOOH phase on high-crystallinity MnP–Co3(PO4)2/NF. This work provides valuable insights into designing efficient and durable OER catalysts for energy conversion applications.
✓ 已验证
产品关联
DOI
高影响因子
PLANT PHYSIOLOGY AND BIOCHEMISTRY
·
2025
·
IF 5.7
Liu Huilin,Huang Yinghui,Zhang Jianbin,Liu Silin,Su Xuexia,Bai Cuihua,Yao Lixian
Dark pericarp disease (DPD) in litchi is a physiological disease caused by excess manganese (Mn) in pericarp, impacting fruit appearance and marketability and leading to substantial economic loss. The susceptibility of litchi varieties to DPD differs greatly, but the underlying mechanisms remain vague. In this study, we investigated the discrepancies in physiological and biochemical processes in pericarp of two varieties (Feizixiao and Heiye) resistant to DPD and a susceptible cultivar (Guiwei) during fruit development from the same orchard. Pericarp Mn in Guiwei was significantly lower than that in Feizixiao and slightly higher than that in Heiye through fruit growth. Under Mn stress, Feizixiao and Heiye maintained ROS homeostasis, whereas substantial H 2 O 2 accumulated in Guiwei. Reduced anthocyanins and soluble sugars and increased lignin were observed in diseased Guiwei compared to Feizixiao and Heiye. The expression of genes encoding Mn transporters, light-harvesting antenna complex, ROS scavenging proteins and enzymes involved in anthocyanin synthesis was downregulated, whereas that of genes functioning in H 2 O 2 production and lignin synthesis was upregulated in Guiwei, and that of genes involved in glucose metabolism was altered, suggesting that Mn was poorly transported and sequestrated within Guiwei pericarp cells, and excess Mn boosted H 2 O 2 overproduction. The inhibited anthocyanin synthesis, enhanced lignin accumulation and tuned sugar metabolism conferred Guiwei adaptability to Mn stress. Conclusively, the poor Mn intracellular transferability and variations in response to H 2 O 2 accumulation associated with disturbed photosynthetic energy deliver under excess Mn, are collaboratively responsible for the cultivar-dependent DPD vulnerability in litchi.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Hu Lan,Zhao Qiuyue,Zhang Xinling,Li Huipeng,Bian Cheng,Zeng Yiqing
Redox sites and acidic sites are the main active sites of bimetallic oxide catalysts used for selective catalytic oxidation of NH 3 (NH 3 -SCO). In this work, three MMoO x (M = Cr, Fe, and Mn) bimetallic oxides catalysts were prepared by simple grinding and calcination to investigate the effect of redox sites (M sites) on the NH 3 -SCO performance. The NH 3 -SCO test results showed that the activity of MMoO x is in the order of CrMoO x > MnMoO x > FeMoO x . The characterization results of H 2 -TPR, O 2 -TPD, NH 3 -TPD, and in situ DRIFTS proposed that the NH 3 -SCO reaction on MMoO x catalysts is proceed via i-SCR mechanism, and the formation of the intermediates of NH 3 -SCR reaction is the decisive reaction step. Owing to the excellent ability in promoting the formation of nitrate/nitrite species, CrMoO x and MnMoO x samples show much higher NH 3 -SCO activity than FeMoO x sample . CrMoO x can facilitate the formation of a large amount of –NH 2 species, which together with nitrate/nitrite species enhance the NH 3 -SCO reaction via i-SCR reaction route. Therefore, CrMoO x shows the highest NH 3 -SCO activity among the MMoO x catalysts. Through this work, the redox sites of bimetallic oxide catalysts are demonstrated as a vital role in inducing the formation of reaction-active intermediates, which highlight the importance of choosing the redox sites in designing NH 3 -SCO catalyst.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Minghao Fan,Xin Zhang,Yi Zhao,Jinglei Zhi,Wanying Xu,Yuqi Yang,Ying Xu,Ke Luo,Dongfeng Wang
Tea polysaccharide (TPS) is a bioactive compound that has attracted increasing attention for its health effect on regulating the metabolism of glucose and lipid. Moreover, due to their good biocompatibility and biodegradability, TPS-based nanoparticles have emerged as effective nanocarriers for the delivery of bioactive molecules. In this study, we developed a TPS-based biocarrier system for the orally targeted administration of Mn(II) ions and investigated their antidiabetic effects in C57BL/6 mice with HFD/streptozotocin (STZ)-induced T2DM. Mn(II)-loaded TPS-based nanoparticles (MTNPs) were synthesized, in which negatively charged functional groups in protein and uronic acid in TPS conjugates would act as binding sites for Mn(II) ions, which is responsible for the cross-linking reaction of MTNP. The resulting MTNP had a spherical shape and a mean particle size of around 30 nm with a Mn(II) ion content of 2.24 ± 0.13 mg/g. In T2DM mice, we discovered that MTNP treatment significantly lowered blood glucose levels and improved glucose intolerance. Furthermore, the impact of MTNP on the recovery of FINS, the homeostatic index of insulin resistance (HOMA-IR), and the homeostatic index of β-cell (HOMA β-cell) levels was significantly larger (p < 0.05) than TPS alone, demonstrating that Mn(II) ions can enhance TPS’s ability to repair HFD/STZ-induced β-cell damage. Mn(II) ions in MTNP not only acted as cofactors to increase the exocytosis of insulin secretory cells by upregulating the expression of Ca(II)/calmodulin-dependent protein kinase II (CaMK II) but also promoted TPS’s lipid-lowering effect in T2DM mice by inhibiting glucogenesis and regulating the lipid metabolism. Our findings suggest that Mn(II) ions can be used not only as cross-linkers in the formation of nanoparticulated TPS but also as cofactors in improving the functional role of TPS in regulating the glucose and lipid metabolism, which will provide insights into the development of TPS-based drug delivery systems for the prevention of type 2 diabetes.
✓ 已验证
DOI
PubMed
高影响因子
ACS ES&T Water
·
2021
·
IF 0
Qiang Cao,Fengyan Lou,Na Liu,Jisong Zhang,Lidong Wu
Today, the Al2O3-supported catalyst in the heterogeneous catalytic ozonation system attracts attention due to its stable structure and relatively high surface activity. Herein, Mn and Cu oxides loaded on γ-Al2O3 pellets were prepared using an impregnation method to improve the removal efficiency in a micropacked bed reactor (μPBR). The effects of the initial pH, the ratio of O3 to chemical oxygen demand (COD), and HO• scavenger on the catalytic performance were investigated. Experimental results showed that the MnO2/γ-Al2O3 and CuO/γ-Al2O3 catalysts exhibited excellent catalytic performance. The COD removal efficiencies were 86.3% for CuO/Al2O3, 76.9% for MnO2/Al2O3, 71.6% for Al2O3, and 35.8% for ozone alone within 71 s. Compared with those of batch reactors, the apparent degradation rate constant of COD with prepared catalysts in a μPBR increased by 2–3 orders of magnitude. In addition, the CuO/γ-Al2O3 catalyst maintained a relatively stable activity in the continuous flow test for a long time (100 h). Finally, some typical antibiotics were treated by catalytic ozonation in a μPBR. The removal efficiencies of these antibiotics and COD reached approximately 100.0% and 62.9–87.8% within 71 s, respectively. Thus, the continuous catalytic ozonation system with the CuO/γ-Al2O3 catalyst based on μPBRs could be a promising pathway for the treatment of industrial wastewater with antibiotics.
✓ 已验证
DOI
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Hongchao Li,Na Yuan,Jieshu Qian,Bingcai Pan
The environmentally benign Mn oxides play a crucial role in the transformation of organic contaminants, either through catalytically decomposing oxidants, e.g., peroxymonosulfate (PMS), or through directly oxidizing the target pollutants. Because of their dual roles and the complex surface chemical reactions, the mechanism involved in Mn oxide-catalyzed PMS activation processes remains obscure. Here, we clearly elucidate the mechanism involved in the Mn2O3 catalyzed PMS activation process by means of separating the PMS activation and the pollutant oxidation process. Mn2O3 acts as a shuttle that mediates the electron transfer from organic substrates to PMS, accompanied by the redox cycle of surface Mn(IV)/Mn(III). Multiple experimental results indicate that PMS is bound to the surface of Mn2O3 to form an inner-sphere complex, which then decomposes to form long-lived surface reactive Mn(IV) species, without the generation of sulfate radicals (SO4•–) and hydroxyl radicals (HO•). The surface reactive Mn(IV) species are proposed to be responsible for the degradation of organic contaminants (e.g., phenol) and the formation of singlet oxygen (1O2), followed by the regeneration of the surface Mn(III) sites on Mn2O3. This study advances the fundamental understanding of the underlying mechanism involved in transition metal oxide-catalyzed PMS activation processes.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）