Journal of Environmental Chemical Engineering
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2025
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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.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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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.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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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.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Menglong Liu,Litao Chen,Jinyang Li,Jiayan Gao,Xue Gao
The excessive use of ofloxacin (OFL) leads to residues in animal-derived foods and poses a threat to human health. Therefore, it is crucial to design a sensitive and reliable detection platform for ofloxacin. In this study, we established a multi-mode sensing platform based on manganese and cerium-doped oxidase-like active carbon dots (Mn, Ce-CDs) for the detection of OFL. The yellow fluorescent substance 2,3-diaminophenothiazine (DAP), produced by the oxidation of o-phenylenediamine (OPD), is used as a colorimetric signal while quenching the fluorescence of Mn, Ce-CDs via fluorescence resonance energy transfer (FRET). Furthermore, the OPD polymer nanoparticles formed by DAP self-aggregation also have excellent photothermal effect. The developed colorimetric/fluorescence/photothermal multi-mode biosensor showed a wide detection range (10 −7 -10 −2 mg/mL) and low detection limit (colorimetric: 2.55 ×10 −9 mg/mL, ratiometric fluorescence: 19.1 ×10 −9 mg/mL, photothermal: 58.6 ×10 −9 mg/mL) in the quantitative detection of OFL. It could be applied to the detection of actual samples with satisfactory results.
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ACS ES&T Water
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2025
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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.
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POLYMER DEGRADATION AND STABILITY
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2024
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IF 6.3
Yingbing Zou,Kui Niu,Fubin Luo,Hongzhou Li
The development of metal oxide flame retardants that are easy to synthesize, efficient, and recyclable would be more beneficial to circular economy. In this work, a porous core-shell Mn 3 CoO x was developed to efficiently reduce heat, smoke as well as hazardous gas during the combustion of epoxy resin (EP). Compared with pure EP, the peak heat release rate (pHRR), total heat release (THR), peak smoke production rate (pSPR), total smoke production (TSP), peak CO production rate (pCOPR), and peak CO 2 production rate (pCO 2 PR) of EP/Mn 3 CoO x are reduced by 47.5 %, 21.5 %, 34.6 %, 17.6 %, 58.6 %, and 55.4 %, respectively. It has been shown that Mn 3 CoO x not only catalyzes the formation of high-quality char layer but also effectively catalyzes the conversion of hazardous gas products into CO 2 . Recovery experiments of Mn 3 CoO x filler in EP composites show that the recovery of Mn 3 CoO x can reach 90.0 %. This work provides insights into the design of efficient metal oxide flame retardants and ideas for the development of recycled flame retardants.
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高影响因子
LANGMUIR
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2025
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IF 3.9
Huining Lan,Jingge Niu,Tianshu Luo,Louqun Wang,Xiaohong Hou
Biological antioxidants play a crucial role in numerous disease-related biological processes, which has led to significant interest in their identification. In this research, a colorimetric sensor array was created. It uses MIL-53 (Fe, Mn) nanozymes to simultaneously detect multiple antioxidants. The bimetallic nanozymes, MIL-53(Fe, Mn), were synthesized by using a solvent-thermal method. This framework demonstrated notable oxidase-like catalytic ability. In particular, it facilitates the conversion of colorless TMB to a blue compound under different pH conditions. When antioxidants were introduced into the reaction system, the sensor array exhibited cross-reactivity, resulting in distinct color signals. Linear discriminant analysis (LDA) was successfully utilized to precisely identify the different concentrations of cysteine (CYS), glutathione (GSH), dopamine (DA), and ascorbic acid (AA) and their combinations. This method enabled accurate determination of the amounts of these substances both individually and in mixtures, providing a reliable way to analyze their concentrations in an experimental context. Furthermore, the prepared sensor array combined with the smartphone successfully distinguished the target antioxidants in the serum. The proposed sensing method would be expected to have practical applications in diagnosis.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Mingfu Li,Shuanglan Hu,Yingchuan Zhang,Jiannan Qin,Douyong Min,Chunlin Chen,Pingjun Zhang,Liqun Jiang,Jian Zhang
The green oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is a crucial step in the development of sustainable and degradable plastics. Here, a series of MnCO 3 -Mn x Co 3-x O 4 -Ov composite oxides are synthesized by a simple solid-state grinding and carbonization method, exhibiting a 100 % HMF conversion rate and 98.7 % FDCA yield directly using air as the oxygen source. Physicochemical characterizations indicate that the introduced carbon promotes the diffusion of Mn species and reduction of Co 3 + /Co 4+ , resulting in more unsaturated coordination of Co–O and the enhanced formation of oxygen vacancies (O v ). The kinetic analysis suggests that the oxidation of HMF to FDCA can be effectively promoted by regulating the O v content in the catalyst after changing the Mn/Co ratio. Moreover, density functional theory (DFT) calculations demonstrate the crucial role of O v in reducing the adsorption energy of HMF on the catalyst surface and activation of O 2 molecules to replenish lattice oxygens during the completion of the catalytic cycle. This work provides a promising strategy to engineer transition metals as alternatives to noble metal-based catalysts towards catalytic oxidation for the production of biofuels and bioplastics.
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ACS Applied Materials & Interfaces
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2022
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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.
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PubMed
高影响因子
ACS ES&T Water
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2021
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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.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Chenhui Hu,Chunhong Liu,Kaimin Du,Chengkai Pang,Zuoxi Zhuo,Qiangsheng Gao
An energy-saving catalyst 4%Fe/Ce-Mn-TiO 2 was prepared via a simple one-step impregnation-annealing process and used as a denitration catalyst at low temperature (≤180 °C) and high water content (∼20%). The results show that 4%Fe/Ce-Mn-TiO 2 catalyst exhibits good low-temperature catalytic activity and water resistance attributed to its highly dispersed metal oxide species, more surface-adsorbed oxygen and high stability of particles. The denitrification efficiencies of 4%Fe/Ce-Mn-TiO 2 catalyst are 90% (5% H 2 O) and 70% (20% H 2 O) at 170 ℃ respectively, which are superior to the commercial vanadium catalyst in service usually needs heating up to 220 ℃.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Yuxian Wang,Lulu Chen,Hongbin Cao,Zhaoxu Chi,Chunmao Chen,Xiaoguang Duan,Yongbing Xie,Fei Qi,Weiyu Song,Jian Liu,Shaobin Wang
La-based perovskites are catalytically active owing to the oxygen vacancies, redox metal centers of B sites and surface hydroxyl groups. Nevertheless, the insights into these active centers on environmental catalysis are still insufficient. In this study, hierarchical mixed oxides perovskite microspheres were synthesized for catalytic ozonation over oxalic acid and benzotriazole. LaMn 4 O x , with LaMnO 3-δ as the dominant crystal phase, demonstrated superior catalytic activity to Mn 2 O 3 and LaMnO 3 synthesized from citric acid sol-gel method. Temperature-programmed desorption of NH 3 (NH 3 -TPD) and pyridine-Fourier transform infrared spectroscopy (pyridine-FTIR) tests proved Lewis acid as the main acid type. Temperature-programmed reduction of H 2 (H 2 -TPR), O 2 -TPD and X-ray photoelectron spectroscopy (XPS) analysis indicated the presence of oxygen vacancies and mixed valences of Mn in the crystal structure facilitated the catalytic process. Moreover, the content of oxygen vacancy was calculated by iodometric titration method. With the aid of theoretical calculations, oxygen vacancies were found to exhibit a strong affinity toward ozone adsorption, where ozone molecules spontaneously dissociated into reactive oxygen species (ROS) such as O 2 − and 1 O 2 . The B site of Mn facilitated ozone decomposition by extending the O O bond of ozone due to the electron transfer from Mn 3+ /Mn 4+ redox cycle. In-situ EPR and quenching tests confirmed the contribution of O 2 − and 1 O 2 in benzotriazole degradation along with OH. This study stepped further to unveil the ozone adsorption/decomposition and ROS generation on nanoscale perovskite-based composites.
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高影响因子
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