Nanomaterials
·
2025
·Vol. 15
·期 11
·792
·
IF 4.3
Xuan Liu,Jie Chao,Feifei Guo,Liangliang Chang,Xinyang Zhang,Wei Long,Zengzhe Xi
Addressing the limitations of poor piezoelectric photocatalytic activity and insufficient magnetic recovery in pure BiFeO 3 nanoparticles, Gd and Zr co-doped BiFeO 3 nanoparticles were synthesized via the sol-gel method. The structural characterization revealed a rhombohedral-to-orthorhombic phase transition with reduced grain size (~35 nm) and lattice distortion due to dopant incorporation. An XPS analysis confirmed Fe 3+ dominance and oxygen vacancy enrichment, while optimized BGFZ9 exhibited enhanced remanent magnetization (0.1753 emu/g, 14.14 increase) compared to undoped BFO. The synergistic piezo-photocatalytic system achieved 81.08% Ofloxacin degradation within 120 min (rate constant: 0.0136 min −1 , 1.26 higher than BFO) through stress-induced piezoelectric fields that promoted electron transfer for ·O 2 − /·OH radical generation via O 2 reduction. The Ofloxacin degradation efficiency decreased to 24.36% after four cycles, with structural integrity confirmed by XRD phase stability. This work demonstrates a triple-optimization mechanism (crystal phase engineering, defect modulation, and magnetic enhancement) for designing magnetically recoverable multiferroic catalysts in pharmaceutical wastewater treatment.
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PubMed
高影响因子
Coatings
·
2025
·Vol. 15
·期 6
·630
·
IF 2.8
Zhaobin Lu,Baoxin Wang,Shengtao Li,Feiyan Pan,Xuewei Zhu,Xiaofeng Wei
In the “dual carbon” objective, the preparation of non-precious metal catalysts with low cost and high activity is essential for the study of hydrogen evolution reactions (HERs). This study employed biomass pomelo peel powder as the carbon source and ammonium metatungstate (AMT) as the tungsten source and, through a facile one-step method in molten salt, fabricated a biomass carbon-based nanocatalyst featuring carbon flakes adorned with tungsten carbide (WC) nanoparticles. Dicyandiamide and cysteine were introduced as nitrogen and sulfur sources, respectively, to explore the impacts of N-S elemental doping on the structure, composition, and HER performance of the WC/C catalyst. The experimental results showed that N-S doping changed the electronic structure of WC and increased the electrochemically active surface area, resulting in a significant increase in the HER activity of WC/C@N-S catalysts. The WC/C@N-S catalyst was evaluated with hydrogen evolution performance in a 0.5 mol/L H2SO4solution. When the cathodic current density reached 10 mA/cm2, the overpotential was 158 mV, and the Tafel slope was 68 mV/dec, underscoring its excellent HER performance. The outcomes offer novel insights into the high-value utilization of agricultural biomass resources, and pave the way for the development of cost-effective, innovative hydrogen evolution catalysts.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yanqiu Jing,Tingsong Li,Zhenzhen Zhou,Chen Hu,Maxim Ivanov,Dariusz Hreniak,Jiang Li
High quality and fine grained 4.5 at.% Sm:YAG transparent ceramics were fabricated by vacuum pre-sintering and hot isostatic pressing (HIP) from the co-precipitated nano-powders. After component optimization, the Sm 0.135 Y 2.865(1+x) Al 5 O 12 (x = 0.005) transparent ceramics have the highest in-line transmittance. Alumina secondary phase was observed in the Sm 0.135 Y 2.865(1+x) Al 5 O 12 (x = −0.001, 0) ceramics. The Sm 0.135 Y 2.865(1+x) Al 5 O 12 (x = 0.001, 0.003, 0.005, 0.007) ceramics showed clear microstructures because of the yttrium ions anti-site defects (Y 3+ in Al 3+ positions) forming. By optimizing the pre-sintering temperature to 1450 °C, the 4.5 at.% Sm:YAG transparent ceramics with the thickness of 2.0 mm achieved a high in-line transmittance of 84.1 % at 808 nm after HIP post-treatment at 1550 °C for 3 h. Fine grain size of 730 nm and appropriate absorption coefficient of 2.94 cm −1 at 1064 nm were also achieved. It is indicated that the 4.5 at.% Sm:YAG transparent ceramics could effectively suppress amplified spontaneous emission and parasitic oscillation as a cladding layer of the high power Nd:YAG ceramic lasers. The co-precipitation method for synthesizing 4.5 at.% Sm:YAG nano-powders were reported in detail, and fine-grained transparent ceramics were fabricated.
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Microstructures
·
2025
·Vol. 5
·期 3
·N
·
IF 9
Kaiwen Tian,Yukang Fu,Inzimamul Haq,Shuangyang Kuang,Gaojie Xiong,Zeyuan Zhao,Tianyu Zhou,Jun Weng,Xiang Peng,Liwei Xiong
Aim: Zinc oxide (ZnO) is an n-type semiconductor with a wide bandgap, excellent electron mobility, and stable chemical characteristics, making it potentially applicable in the field of gas sensing. However, conventional ZnO-based gas sensors face challenges such as high operating temperatures and low sensitivity.Methods: In this paper, we first synthesized ZIF-8 with a rhombic dodecahedron structure using a room-temperature chemical precipitation method. By doping ZIF-8 with cobalt (Co) and exchanging gold ions, followed by calcination in air, we obtained a metal-organic framework (MOF) derived porous Au@Co-ZnO nanostructure.Results: This nanostructure retained the large specific surface area and porous characteristics of ZIF-8, while its gas sensing performance was significantly enhanced compared to the pure MOF-derived ZnO nanostructure, due to Co doping and gold nanoparticle modification. At an ethanol concentration of 100 ppm, the Au@Co-ZnO sample demonstrated its best performance at 140 °C, with a response value of 205.3. This result was 28.9 times higher compared to the pure ZnO sample, which showed a response value of 7.1 under identical conditions. Additionally, the optimal operating temperature was 40 °C lower than that of the pure ZnO sample (180 °C). Furthermore, the Au@Co-ZnO samples demonstrated good stability and selectivity for ethanol gas.Conclusion: The proposed MOF-derived porous Au@Co-ZnO nanostructures not only advance the application of MOF-derived materials in gas detection but also offer a novel approach for boosting the gas-sensing performance of other metal oxide materials.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lin-Jie Guo,Yi-Lei Li,Feng Xu,Yuan Zhuang,Xuan-Ru Zhang,Zu-Heng Hu,Le-Zhong Li
This study investigates the effects of co-doping Bi 2 O 3 and Nb 2 O 5 on the microstructure, electrical, and magnetic properties of NiZnCo ferrites. The NiZnCo ferrites with fixed 0.3 wt.% Bi 2 O 3 doping and different Nb 2 O 5 doping contents (0–0.8 wt.%) were synthesized by state-phase reaction method. The study shows that all Ni 0.55 Zn 0.35 Co 0.1 Fe 2 O 4 samples co-doped with Bi 2 O 3 and Nb 2 O 5 exhibit a single-phase spinel structure. With increasing Nb 2 O 5 concentration, the average grain size of the ferrites increases continuously, while the porosity decreases. Furthermore, the real part of the dielectric constant rises to 2.42×10 5 , and the DC resistivity decreases to 3.08×10 5 Ω·m. The saturation magnetization varies from 40.78 to 53.29 emu/g, and the coercivity ranges from 18.00 to 19.14 Oe. Notably, among samples with different Nb 2 O 5 doping levels, the ferrite co-doped with 0.2 wt.% Nb 2 O 5 exhibits the highest initial permeability of 111.24, which is approximately four times higher than that of pure NiZnCo ferrite. These results indicate that Bi 2 O 3 –Nb 2 O 5 co-doping not only effectively regulates grain growth and porosity but also achieves a synergistic optimization of dielectric and magnetic properties. The introduction of an appropriate amount of Nb 2 O 5 leads to high initial permeability and moderate DC resistivity, helping to reduce mismatches between magnetic and dielectric losses. The combination of high dielectric constant and favorable magnetic response enhances the impedance matching and energy dissipation capabilities of the material for electromagnetic waves. Therefore, this co-doped ferrite offers a promising material candidate for the design of electromagnetic absorbers and soft magnetic components.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Feihong Yang,Weiwei Li,Peng Luo,Jing Cheng,Laiming Chen
Transparent Yb:CaF 2 ceramics have recently emerged as a promising ultra-fast laser medium with broad emission bandwidth, long lifetime and suitable thermal properties. However, Yb 3+ clustering in the CaF 2 host strongly influences the performance of these materials as solid-state laser gain media, and mitigating this clustering remains a challenge. Herein, we introduced Y 3+ and Gd 3+ buffer ions simultaneously for the first time to modulate the fluorescence properties of transparent Yb:CaF 2 ceramics and explore the effect of Y 3+ and Gd 3+ ions co-doping on the optical quality and microstructure of the ceramics. It was found that transmittance in the short wavelength was improved and fluorescence properties could be modulated to a larger extent compared to single buffer ion doping. This finding establishes the correlation between the double buffer ions doping and the fluorescence properties in transparent Yb:CaF 2 ceramics, and may lead to innovative techniques of transmitting enhancement, as well as its ultrafast laser applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yang Kuang,Gang Zhao,Tengrui Feng,Luchao Zhao,Qi Wu
Molybdenum diselenide (MoSe 2 ) has been extensively researched as a promising electrocatalyst for hydrogen evolution reaction (HER). However, its intrinsic properties are still constrained by insufficient exposure of the active site and poor electrical conductivity. Therefore, it is essential to synthesize metallic phase MoSe 2 (1T-MoSe 2 ) with abundant active sites in order to further enhance its HER performance. To achieve this goal, Co-doped MoSe 2 nanosheets with a high 1T phase concentration were synthesized using a simple one-step hydrothermal method. Experiments and theories have demonstrated that Co doping induces the phase transition of MoSe 2 from the 2H to the 1T phase. In a 1 M KOH solution, the overpotential of Co-doped 1T-MoSe 2 at 10 mA cm −2 is only 218 mV, which is significantly superior to that of pure MoSe 2 (287 mV), and the Tafel slope is lower at 115.7 mVdec −1 . Furthermore, the nanosheets exhibited high stability, retaining their catalytic properties even after 200 h of continuous use. Density functional theory (DFT) calculations indicate that Co doping enhances the electrical conductivity and the achieves a minimal value of ΔG H∗ (only about 0.094 eV). This work proposes a strategy to design highly efficient electrocatalysts based on 1T-MoSe 2 .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hao Zhang,Guangyuan Chen,Miaomiao He,Kui Tang,Haoyuan Li,Xuanhao Liang,Yanhao Song,Chuan Tan,Ling Zhang,Tao Duan,Lin Zhu
Efficiently removing both CH 3 I and I 2 from radioactive exhaust streams remains a challeng. In this study, we successfully synthesized a bismuth-based organic ionic polymers (Bi@OIP) embedded with palladium, designed for the co-adsorption of CH 3 I and I 2 . The Bi@OIP material demonstrates high uptake capacities of 2257.7 mg g −1 for iodine vapor and 390.0 mg g −1 for methyl iodide. Palladium embedded within the polymer matrix catalyzes the reaction between CH 3 I and Bi, leading to the formation of BiI 3 , thus overcoming the inertness of traditional bismuth-based adsorbents toward methyl iodide. This bismuth-palladium synergistic effect significantly enhances the co-removal capabilities for both iodine and methyl iodide, positioning Bi@OIP as a promising candidate for the efficient capture of radioiodine and methyl iodide from exhaust gases.
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AICHE JOURNAL
·
2025
·
IF 4
Jiamei Wei,Peng Gao,Shen Wang,Yue Ma,Dong Cao,Daojian Cheng
Metal-support interaction (MSI) is of great significance for designing the supported metal catalysts with high catalytic activity and selectivity. In this work, the MSI between Co and the carbon layer in armored cobalt nanoparticle catalysts (Co@xC) is effectively regulated based on the channel confinement strategy. Notably, a direct volcanic relationship could be obtained between the MSI strength of catalysts and the reaction rate constant. The Co@2.5C catalyst with suitable MSI strength achieves complete 1-hexene conversion (100%) and the yield of heptanal is 17,161 mol kg Co −1 h −1 during the 1-hexene hydroformylation reaction. Further in situ / ex situ characterizations combined with theoretical calculations confirm the appropriate MSI accelerates the electron transfer from the carbon atom to the Co site, thereby enhancing the adsorption of 1-hexene species and boosting the reaction kinetics (the first-order reaction rate constant is 0.017 min −1 ). The volcanic structure-activity relationship in this work exhibits guiding significance for the development of industrial catalysts.
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BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Lanjun Liu,Changqing Cao,Yuhan Du,Naveed Ramzan,Peigao Duan
This study investigated co-gasification of municipal sludge (MS) and black liquor (BL) in supercritical water for hydrogen production and pollution handling. The influence of the blending ratio (0–100 %), alkali content of BL (10 %, 20 %), reaction time (5–40 min), reaction temperature (400–600 °C) and total concentration (5-20 wt%) was investigated through thermodynamic analysis and experimental study. Thermodynamic modelling showed that MS addition increased the hydrogen fraction, but reduced the yield of other gas components. A synergistic enhancement was observed in MS/BL co-gasification, and the gasification efficiency had the highest improvement with MS/BL ratio of 40:60. Co-gasification also reduced N-containing compounds and alkylphenols in the liquid residue but increased phenol content. Increasing the alkali content of BL to 20 % boosted the synergistic effect, and shifted the optimal ratio to 50:50. The extension of reaction time from 5 to 20 min improved the gasification efficiency and hydrogen production, but further extension beyond 20min showed little impact. Increasing temperature favored the gasification, and the highest gasification efficiency (118.57 %), hydrogen yield (18.73 mol/kg) and COD removal rate (97.97 %) were obtained at 600 °C. These parameters showed different impact on the cold gas efficiency, H 2 selectivity and heating value of the gas product, where temperature exhibited highest influence.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Chunying Liu,Li Lv,Kun Liu,Junsu Jin,Jianguo Mi,Yongqiang Ren,Shisen Xu
By coupling CALF-20 on ZIF-7 via in situ crystallization in the confined micrometer-sized pores of poly(acrylates), a novel composite, namely, CALF-20-on-ZIF-7@poly(acrylates), has been synthesized for the simultaneous removal of CO2 and H2S from IGCC feed gas. Within this coupled crystal, CALF-20, known for its strong adsorption capacity and excellent stability toward CO2 and H2S, serves as the outer layer crystal to shift the adsorption/desorption hysteresis loop of inner ZIF-7 to beyond atmosphere pressure. Under high pressure, CO2 and H2S are automatically adsorbed. Upon reducing the pressure to the atmospheric level, CO2 is automatically released, while H2S remains temporarily due to its high adsorption energy. After about 150 cycles of CO2 adsorption/desorption of the kilogram-scale composite, H2S approaches saturation and is then removed by vacuuming. Since the content of H2S in IGCC feed gas is trivial, the total energy consumption for the composite regeneration is 0.16 MJ/kg (CO2). After 600 consecutive cycles, the CO2 adsorption capability of the composite decreases by 0.41%, demonstrating excellent cyclic stability.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Fengli Yang,Yi Su,Guangpin Lin,Jiawang Liu,Feifei Xia,Guobin Liang,Wei Lin,Huabing Zhang
Photocatalytic nitrogen fixation presents a promising alternative to the traditional Haber-Bosch process. In this study, Fe/Br co-doped bismuth molybdate (Fe/Br-BMO) was synthesized for the photocatalytic production of ammonia, achieving a production rate of 156.7 µmol g −1 h −1 . Characterization of the catalyst reveals that Fe/Br co-doping not only modifies the energy band structure and electronic properties of the catalyst but also expands the light absorption spectrum, inhibits the rapid recombination of photogenerated charge carriers, and increases both the specific surface area and the number of oxygen vacancies within the catalyst, which promote N 2 adsorption and activation and a significant reduction in the free energy of the rate-limiting step. These improvements effectively facilitate the adsorption and activation of N 2 molecules, lower the Gibbs free energy associated with the rate-limiting step, and ultimately enhance the photocatalytic activity
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