Catalysts
·
2020
·Vol. 10
·期 4
·373
·
IF 3.52
Junjiao Zhang,Zhengru Zhu,Junchao Jiang,Hong Li
AgI/MFeO3/g-C3N4(M = Y, Gd, La) nano sheet–sphere–sheet photocatalysts were synthesized by a simple ultrasound-assisted hydrothermal approach. We characterized the microstructure, surface morphology, and optical absorption capacity of the obtained samples. According to the characterization results, AgI/MFeO3/g-C3N4(M = Y, Gd, La) nano sheet–sphere–sheet photocatalysts were successfully obtained. MFeO3nanospheres and AgI nanosheets were dispersed evenly on the surface of g-C3N4nanosheets. AgI/MFeO3/g-C3N4showed remarkable photocatalytic. Especially, 95% of NOF was photodegradated over AgI/LaFeO3/g-C3N4within 3 h and the higher photocatalytic performance still remained after six cycles. Additionally, The N2adsorption–desorption isotherms of AgI/MFeO3/g-C3N4showed that AgI/LaFeO3/g-C3N4possessed the highest specific surface area (79.32 m2/g). The result of scavenging experiment revealed that ·O2−, h+, and ·OH were the main roles in the photodegradation process. Benefitting from the nice energy band matching, MFeO3acted as the center of photogenerated electrons migration and separation provided more direct electron channels. This work proposes an effective approach for the design and configuration of dual Z-scheme photocatalysts to accomplish the removal of organic contaminants based on g-C3N4.
研究领域:
环境科学
·
材料科学
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Guidong Xu,Yifan Yang,Yanshuo Hui,Jingqian Wang,Shiyi Liu,Lin Fu,Jun Ma,Shuo Geng
The development of anode catalysts with high activity and stability is crucial for advancing proton exchange membrane water electrolysis (PEMWE). RuO 2 is a promising, cost-effective alternative to IrO 2 for the acidic oxygen evolution reaction (OER); however, its practical deployment is critically limited by ruthenium site dissolution and irreversible lattice oxygen loss. To address these challenges, a “rare-earth co-doping, electronic structure modulation, and reaction pathway steering” strategy was developed and successfully applied to synthesize Yb- and La-co-doped RuO 2 nanosheets (Yb,La-RuO 2 ) via a salt-templating method. The resulting catalyst exhibits outstanding OER performance in 0.1 M HClO 4 , delivering a low overpotential of 205 mV at 10 mA cm −2 and maintaining stable operation for 500 h. When employed as the anode catalyst in a PEMWE, it maintains stable operation at a current density of 500 mA cm −2 for 200 h. Density functional theory (DFT) and X-ray absorption spectroscopy reveal that La primarily serves as an electron donor to optimize the intrinsic activity of Ru sites, whereas Yb strengthens lattice oxygen bonding, thereby enhancing structural robustness. Their synergistic interaction modulates the electronic structure of Ru and reduces the covalency of Ru–O bonds. Furthermore, in situ attenuated total reflection–surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) analysis demonstrates that Yb and La co-doping shifts the reaction mechanism from the lattice oxygen mechanism (LOM)—a pathway prone to oxidative degradation—toward the more stable adsorbate evolution mechanism (AEM). This transition effectively suppresses Ru overoxidation and dissolution, significantly improving catalyst durability. This work presents a rational co-doping approach for designing highly efficient and acid-stable OER catalysts, offering valuable insights for the practical deployment of PEMWE technology.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jinyun Guan,Dandan Wang,Xiaozheng Ma,Ruoxin Wang,Lin Dang,Yihang Sun,Yichenyang Li,Jifeng Guo
Eutrophication of aquatic water bodies and the consequent harmful algal blooms (HABs) induced by excessive phosphorus (P) have become a critical global environmental challenge. In this study, a flower-like spherical metal-organic framework (MOF) material, La-BDC-NH 2 , was successfully synthesized via a hydrothermal method for the simultaneous phosphate adsorption and Microcystis aeruginosa flocculation. Its physicochemical properties were systematically characterized using a suite of analytical techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The results of phosphate adsorption performance tests demonstrated that the maximum adsorption capacity of this material for phosphate reached 75.65 mg/g at 25 °C. In the microalgal flocculation experiments, the harvesting efficiency of Microcystis aeruginosa exceeded 95% at the optimal dosage of 0.2 g/L. Notably, La-BDC-NH 2 retained excellent phosphate adsorption and microalgal flocculation performance over a broad pH range (4–10) and initial algal concentration range (OD 680 = 0.1–1.0), thus exhibiting robust adaptability to complex aquatic environments. Furthermore, this material could efficiently convert proteinaceous extracellular organic matter (EOM) released by Microcystis aeruginosa into more stable humic acid-like substances, thereby mitigating the environmental risks associated with EOM accumulation. Ultimately, this study demonstrates that La-BDC-NH 2 is a multifunctional, highly efficient, and stable environmental functional material for aquatic eutrophication control. It has good application prospects in controlling HABs and aquatic eutrophication, and provides a practical and feasible technical strategy for mitigating harmful algal blooms in eutrophic aquatic systems.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 22
·13473-13482
·
IF 10.733
Kailun Zou,Yu Dan,Yuxi Yu,Ying Zhang,Qingfeng Zhang,Yinmei Lu,Haitao Huang,Xin Zhang,Yunbin He
Dielectric nanocomposites composed of a polymer matrix with high electric breakdown strength and inorganic ferroelectric nanofillers with large maximum electric displacement (Dmax) have recently attracted much attention due to their high power density, superior flexibility, and good fatigue endurance. However, their discharge energy density and energy efficiency are limited because of the high remnant displacement (Dr) and small Dmax − Dr values of the ferroelectric fillers. Compared with ferroelectrics, antiferroelectrics exhibit much lower Dr (near zero) and far larger Dmax − Dr values, and thus if they are used as the fillers of the dielectric composite, a larger discharge energy density and higher energy efficiency may be obtained simultaneously. Based on this, in this work, Pb0.97La0.02(Zr0.50Sn0.45Ti0.05)O3 (PLZST) antiferroelectric nanoparticles (∼200 nm in diameter) coated with a dense and robust dopamine layer are prepared in order to develop dopamine-modified PLZST filler/poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) polymer nanocomposites with superior energy storage properties. The experimental results indicate that optimizing the filler content leads to a small Dr (0.61 μC cm−2), large Dmax − Dr value (6.14 μC cm−2), and high electric breakdown strength (3136 kV cm−1), as a result of which, the PLZST/P(VDF-HFP) nanocomposites filled with 5 wt% dopamine-modified PLZST nanoparticles simultaneously exhibit a large discharge energy density of 9.39 J cm−3 and high energy efficiency of 82%. These energy storage properties are superior to those of most ferroelectric filler (including nanowires and nanofibers prepared by complicated methods)/polymer nanocomposites with a single-layer structure. Our work not only proves that, antiferroelectric nanoparticles are excellent fillers that can be comparable to, or even better than, ferroelectric nanowires and nanofibers prepared by very complicated methods, for energy-storage inorganic/polymer dielectric composites, but also provides a convenient and effective way to prepare and design flexible dielectric capacitors with superior energy storage capacity.
研究领域:
材料科学
·
纳米技术
·
电气工程
·
复合材料
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高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Zenghui Bi,Hua Zhang,Xue Zhao,Yuwen Wang,Fang Tan,Songqing Chen,Ligang Feng,Yingtang Zhou,Xin Ma,Zhi Su,Xinzhong Wang,Thomas Wågberg,Guangzhi Hu
Inexpensive, high-activity bifunctional catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are imperative for the development of energy storage and conversion systems. A nitrogen-doped carbon material with a micro−meso−macroporous structure doped with La (LaPNC) containing La−O/N−C active sites is prepared using SiO 2 particle templating of carbon and a metal node exchange strategy. The coordination environment of La sites stabilized by two oxygen and four nitrogen atoms (LaO 2 N 4 ), is further verified by X-ray absorption spectroscopy. The ORR half-wave potential reaches 0.852 V, and the OER overpotential reaches 263 mV at 10 mA cm −2 . The Zn−air battery, with LaPNC as the air cathode, has a maximum power density of 202 mW cm −2 and achieves stable charge−discharge for at least 100 h without a significant increase or decrease in the charge or discharge voltages, respectively. Density functional theory calculations suggest that LaO 2 N 4 sites exhibit the lowest activation free energy and the most easily desorbed oxygen capacity. This study provides new insights into the design of efficient, durable bifunctional catalysts as alternatives to precious-metal-based catalysts.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Hairus Abdullah,Yu-Rou Ko,Dong-Hau Kuo,Noto Susanto Gultom
La–Sn-codoped Zn(O,S) catalysts were synthesized with different amounts (0%, 2.5%, 5%, and 10%) of Sn and a constant amount (10%) of La to improve the photocatalytic hydrogenation reaction (PHR) of azobenzene to aniline. The as-prepared catalysts were carefully characterized and tested for a hydrogenation reaction. The incorporation of Sn significantly enhanced the PHR activities since the incorporated Sn in the Zn(O,S) lattices could increase the conductivity of the catalysts to improve the charge transfer during the catalytic reaction as indicated with EIS measurement. Further measurement with a photoresponse of La–Sn-codoped Zn(O,S) catalysts also exhibited relatively higher intensities as compared to those of La-doped Zn(O,S) and Sn-doped Zn(O,S) catalysts. On the basis of the measurement results of EIS and transient photo current, the La–Sn-codoped Zn(O,S) with the best properties was further utilized for PHR to convert azobenzene to aniline. GC–MS measurement confirmed that 15 ppm azobenzene could be totally converted to aniline in only 60 min which was achieved with a catalyst that was prepared with 5%-Sn and 10%-La doping. The relatively short reaction time indicated that the as-prepared catalyst had a strong reduction capability able to cleave the strong bonding of N═N in azobenzene. The reaction kinetic of the N═N bond cleavage was elucidated based on solvation, adsorption, pinning, and photocatalytic hydrogenation processes on the catalyst surfaces.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ziwei Gao,Tao Zhang,Md. Nahid Pervez,Guojuan Qu,Wei Jin,Yaping Zhao
Materials combing catalytic and adsorption dual active sites are very important for arsenite (As(III)) due to its high mobility in water. Therefore, in this study, a bifunctional walnut-like Co-doped La(OH) 3 composites (Co-La) with independent catalytic sites and post-formed adsorption sites were synthesized via a simple hydrothermal method. Nearly 100% As(III) removal can be achieved in Co-La and peroxymonosulfate interaction systems (Co-La/PMS) within 10 min at the molar ratio of PMS to As(III) of 1.2. The results indicate that the combined Co-La adsorption system demonstrated superior performance compared to the Co-La adsorption alone. Precisely, the maximum removal capacity of the system was measured at 243.90 mg·g −1 , and the pseudo-first-order kinetic rate constant ( k 1 ) was determined to be 1.0771 min −1 . These values were significantly greater than those observed for Co-La adsorption alone. Notably, the kinetic rate constant was 239 times faster, and the removal capacity was 4.6 times higher in the combined system. The fast kinetics of As(III) elimination can be elucidated by the production of reactive oxygen species (ROS) such as S O 4 · - , •OH, O 2 · - and 1 O 2 , which expedite the conversion of As(III) into arsenate (As(V) in this particular system. Meanwhile, the increase in adsorption capacity is ascribed to the fact that PMS can drive La(OH) 3 of Co-La to transform into transition states La 2 SO 4 (OH) 4 , thus generating a new exchangeable adsorption site for As(V). A fixed membrane reactor assembled with Co-La was utilized to achieve a near-complete removal of As(III) within 3 min. The Co-La/PMS systems demonstrate exceptional effectiveness in eliminating arsenic from water across diverse real-water metrics, offering a unique perspective and technological progress in purifying water contaminated with arsenic.
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 6
·1-13
·
IF 2.8
Wang Huajun,He Junwei,Zou Liming,Wang Chao,Li Yan Vivian
High mechanical property poly (vinyl alcohol) (PVA) fibers have attracted tremendous attentions because of their excellent mechanical properties and has a potential application in the field of building enhancement. In this article, PVA polymer with high polymerization degree ( P n ) and high Syndiotacticity-diad content ( S-diad ) were synthesized using vinyl acetate (VAc) and vinyl pivalate (VPi) as monomers via emulsion polymerization with water as solvent, the GPC and 1 H NMR were used to characterized the P n and S-diad of PVA polymer. Then the lanthanum chloride (LaCl 3 ) was chosen as cross-linking and the synthesized PVA polymer as raw material for dry-wet spinning, a series of PVA fibers with high strength and high modulus have been prepared. The final PVA-La fibers were characterized through a series of experiments including of FTIR, SEM, DSC, TGA, XRD and fiber tensile tester. It turned out that the P n and S-diad of synthesized PVA polymer were 4817 ± 76 and 56.3 ± 0.7%. With the increasing of LaCl 3 content, the -OH vibration absorption peak of PVA-La composite fiber gradually increased from 3462 cm -1 to 3484 cm -1 ; the strength, modulus, crystallinity and orientation all increased first and then decreased. Especially, the properties of PVA-La fiber exhibited an optimal LaCl 3 content of 0.8 wt%, the denier was 5.4 ± 0.5 dtex, the tensile strength and highest elastic modulus of 15.19 ± 0.5 cN/dtex and 369.21 ± 9.1cN/dtex, the elongation at break was 3.72 ± 0.4%, the crystallinity was 53.9 ± 0.6%, the orientation was 95.6 ± 0.6%.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2016
·
IF 2.265
Zige Zhang,Guoxiang Li,Zijian Cui,Kaiyue Zhang,Yaqing Feng,Shuxian Meng
Facilitated by TiO 2 particles adsorbing lanthanide ions in hydrosol, La-doped TiO 2 was produced by a hydrothermal method . The structure, optical and photoluminescence properties of down-converting photoelectrode with the La 3+ were characterized by X-ray (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray detector (EDX) and N 2 adsorption-desorption isotherms measurement. The photoelectric conversion efficiency of dye-sensitized solar cells (DSSCs) fabricated with 0.05 g-La/TiO 2 reached 7.02%, which gave an efficiency improved by 10.36% compared with that of cells fabricated from pure TiO 2 . The improvement in efficiency was ascribed to more dyes adsorbed on the surface of TiO 2 .
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jun-Min Zhang,Xiao-Wu Chen,Xiao You,Qing-Gang Li,Meng-Meng Wang,Xiang-Yu Zhang,Yan-Mei Kan,Yu-Dong Xue,Shao-Ming Dong
The effect of RE 2 O 3 (RE = La, Y, Er, Lu) on the oxidation behavior of RMI-SiC ceramics in air and wet oxygen atmospheres at 1400 °C were studied. The outward migration of RE 3+ cations reduces the oxidation resistance of SiC-RE ceramics in air, but improves the wet-oxidation resistance of SiC-RE ceramics due to the formation of denser RE 2 Si 2 O 7 layer. The outward migration rates of RE 3+ cations may be influenced jointly by the RE 3+ cation radius and the formation rate of RE 2 Si 2 O 7 . The higher mobility of Er 3+ and Y 3+ cations makes Y 2 O 3 and Er 2 O 3 promising modifier for enhancing the wet-oxidation resistance of RMI-SiC f /SiC composites, although the modified components need to be optimized and further analyzed in a more realistic service environment.
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CHEMICAL GEOLOGY
·
2024
·
IF 3.6
Xinting Lü,Detao He,Yongsheng Liu,Ming Li,Jie Lin,Wei Chen,Lüyun Zhu,Ao Yang,Yantong Feng,Zhenyi Liu,Xianli Zeng,Zhaochu Hu
Iron oxide minerals, such as hematite and magnetite, are commonly found in a wide range of geological environments. Their Fe isotopic composition acts as a potent geochemical tracer, finding applications across various realms of Earth sciences. However, natural iron oxide minerals often have a high Cr content up to percentile levels, necessitating correction of isobaric interference caused by 54 Cr + on 54 Fe + to ensure accurate and precise in situ Fe isotopic compositions. In this study, a pure chromium metal with homogeneous isotopic compositions was examined within the analysis sequence to obtain the fractionation factor of Cr (β Cr ) for isobaric interference correction. A femtosecond laser ablation system combined with wet plasma conditions was used to decrease the matrix effect. We synthesized a series of magnetite and hematite samples with simple matrix as well as natural magnetite samples with complex matrix to evaluate the feasibility of Cr interference correction. By employing our proposed correction method, the deviation caused by the isobaric interference of 54 Cr + was effectively eliminated. The corrected δ 56 Fe values for hematite and magnetite samples, even with a Cr/Fe ratio of as high as 1.27, exhibited good agreement with the reference values within the long-term reproducibility uncertainty of 0.10‰. These results indicate the robustness of Cr interference correction in obtaining accurate Fe isotopic compositions of Cr-rich iron oxides.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
·
IF 5.8
Bin Zhang,Ya’nan Li,Shuai Lu,Jonathan Richard Ishengoma,Song Wang,Jie Liu,Tao Tang,Sanxi Li
Plastic waste causes serious pollution to the environment. Being not satisfied with simply disposing of them into environment, people want to efficiently convert it into high-value products, such as H 2 and carbon nanotubes . A trimetallic catalyst is provided herein, which adds Pr, Ce, La or Yb to a Co-Fe bimetallic catalyst to inhibit the formation of oil by-product in a plastic pyrolysis reaction. In this work,various plastics，including plastics with different functional groups and real plastic waste were used for pyrolysis with elemental hydrogen efficiencies above 95% in the gas product. For pyrolysis of EVA, the gaseous hydrogen efficiency reached 96.07%, and for pyrolysis of LLDPE , the gaseous hydrogen efficiency reached 95.56%, over Pr 1 Co 1 Fe 8 O x catalyst. The role of Pr in catalytic reactions is discussed in general and the formation of carbon nanotubes of various types of structures is simulated. Catalyst cycling experiments demonstrate that the catalyst still maintains a gas hydrogen efficiency of more than 70% after being used four times. In conclusion, the Pr 1 Co 1 Fe 8 O x catalyst proved to be the best choice for microwave-assisted catalytic pyrolysis of plastics to H 2 , and this work provides a new perspect for the study of plastic pyrolysis.
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