JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Chaolong Liu,Keng Xuan,Yaoping Guo,Hao Jiang,Wenjie Ma,Xuegang Wang,Zhongkui Zhou,Jun Li,Yadan Guo
WO 3 -based materials are theoretically promising photocatalysts for uranium(VI) removal due to their stability and narrow bandgap (∼2.8 eV), but they are limited by a lack of adsorption sites and a tendency for photogenerated electron-hole pairs to recombine. Herein, La-doped WO 3 (W 0.9 La 0.1 O 3-x ) rich in oxygen vacancies (OVs) was prepared via a facile hydrothermal method. La doping and the introduction of OVs provided abundant active sites, optimized the band structure, increased electron density, and inhibited electron-hole pair recombination of W 0.9 La 0.1 O 3-x , which resulted in a maximum U(VI) extraction capacity of up to 1199.73 mg/g through synergistic adsorption-photocatalytic reduction processes. Interestingly, W 0.9 La 0.1 O 3-x demonstrated excellent stability and increased recyclability, superior to that of most reported adsorbents and photocatalysts, probably owing to the strong stability of W and La atoms as well as the additional OVs formed from self-reduction of W 0.9 La 0.1 O 3-x during photocatalytic reaction process. Overall, this study expands the application of WO 3 -based materials for U(VI) removal from wastewater and provides valuable theoretical insights and technical guidance for addressing the challenge of balancing removal rate and stability of U(VI) extraction materials.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 11
·1-12
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IF 2.8
Yang Zaizhi,Wang Xi,Zhang Liang,Li Hailing,Zhang Hui,Xu Dong
Flash sintering is considered a promising energy-saving and efficient technology for preparing high-temperature ceramics. The effects of limited current on flash sintering parameters, microstructure, and electrical properties of (La 1/2 , Ta 1/2 ) 0.02 Ti 0.98 O 2 ceramic were investigated by the XRD, SEM, XPS, and precision impedance analyzer. With limiting current increase, the grain size of flash sintering sample increases gradually, and the relative density increases first and then decreases. The average grain size is about 1 μm, and the highest relative density is 96.9%. Joule heating runaway and oxygen vacancy defect lead to rapid densification of flash sintering La and Ta co-doped TiO 2 ceramics. According to the EPDD model, doped La 3+ and Ta 5+ ions increase the concentration of oxygen vacancies and free electrons, lead to local polarization of carriers, and obtain a giant dielectric constant of ε ’ = 7.6 × 10 4 and low dielectric loss of tanδ = 0.11. At high temperature, electrons break free from the constraints of defect clusters and accumulate at the interface, leading to interface polarization due to the IBLC model. The giant dielectric properties originate from the combined effect of EPDD and IBLC model.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Xiufen Yang,Runzhi Han,LiWei Shi,YiXin Li,Changyong Lan,Leiming Chen,Chuanfu Huang
To address the persistent challenges of wide band gap (2.13 eV), high carrier recombination rates, and poor cycling stability in bismuth ferrite (BiFeO 3 BFO)-based photocatalysts, this study introduces an unprecedented La³⁺/Ti⁴⁺ dual-site doping strategy. La/Ti co-doped BFO nanoparticles (n% BLFTO) were synthesized using a sol-gel method. The synergistic effects of La³⁺-induced gradient oxygen vacancies (increased by 270%) and Ti³⁺/Ti⁴⁺ redox couples led to a significant band gap narrowing to 1.79 eV, extending visible light absorption to 450-700 nm. Remarkably, the optimized 30% BLFTO sample achieved a 98.9% degradation efficiency of Rhodamine B (Rh B) within 120 minutes-7.17% higher than pure BFO and maintained 95.92% efficiency after 12 cycles (2.98% decay), demonstrating exceptional stability rarely reported in prior works. In-situ X-ray Photoelectron Spectroscopy and Photoluminescence Spectroscopy analyses revealed that dual-doping synergistically modulates carrier dynamics via Fe²⁺/Fe³⁺ mixed valency and abundant oxygen vacancies, thereby prolonging carrier lifetimes and enhancing photocatalytic activity. This work pioneers a dual-doping framework that simultaneously enables highly efficient visible-light-driven degradation of Rh B and exceptional cycling stability, offering new insights for the design of robust photocatalysts for environmental remediation and renewable energy applications.
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CHEMICAL GEOLOGY
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2025
·
IF 3.6
Changjin Liang,Honghai Wu,Yaowei Li,Yufeng Guan
Ferrihydrite (Fh) can usually transform into phases with higher crystallinities. This may greatly alter Fh adsorption capacity for chromium ions, thereby affecting their immobilizations and fates. Foreign elements [e.g., lanthanum (La)] as impurities can become incorporated into Fh. Herein, the effect of La-substitution into Fh and the influence of the presence of Cr(VI) on Fh phase transformation and fate of Cr(VI) were investigated. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Electro-chemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS) and other test methods were employed to probe phase changes after the Fe(II)-induced La-substituted Fh (La-Fh) transformations. At pH 5.5, no neoformed phase was observed until 7 d for La-Fh or pure Fh at 1 mM Fe(II) aq, but all La-Fh systems underwent transformations at 5 mM Fe(II)aq. A low pH and Fe(II)aq level favored lepidocrocite (Lp) to form, whereas goethite (Gt) was the predominant phase rather than Lp as pH increased to 7.2 with higher level Fe(II)aq. However, the La-substitution inhibits the La-Fh transformation rate and path. This made 5 % La-Fh transformed to Lp after 30 d at pH 7.2 and 1 mM Fe(II)aq. The La-release was present to some extent during the transformation process. Either the inhibition to La-Fh transformation or the La-slow release favors the retention of early-adsorbed Cr(VI) on iron-mineral surface. The added Cr(VI) might promote the La-Fh transformation even under a lower-level Fe(II), primarily attributed to the rapid reduction of Cr(VI) to Cr(III) by Fe(II), which produced more liable Fe(III) in addition to the Cr(III) that can improve the mineral conductivity, thereby enhancing the La-Fh transformation. Mechanisms responsible for the Fe(II)-induced La-Fh transformation companying the La slow-release are proposed to provide insights into the reduction and immobilization of Cr(VI) under anaerobic conditions, thus demonstrating that La-Fh is a promising material for application in Cr-contaminated site remediation.
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LANGMUIR
·
2024
·
IF 3.7
Yuanzhen He,Dengjie Zhong,Yunlan Xu,Ran Jiang,Jiayou Zhang,Pengfei Liao
A La-doped Ti/SnO2-Sb2O4 electrode with TiO2-NTs intermediate layer (Ti/TiO2-NTs/SnO2-Sb2O4-La) was created via the electrodeposition technique. The physicochemical and electrochemical properties of the electrode were analyzed through FESEM, XRD, XPS, CV, and LSV electrochemical tests. The results showed that TiO2-NTs were tightly packed on the surface of Ti substrate, thus improving the binding force of the SnO2-Sb2O4-La coating, offering greater specific surface area, more active spots, higher current response, and longer lifespan for the degradation of rhodamine B. The lifespan of the Ti/TiO2-NTs/SnO2-Sb2O4-La electrode reached 200 min (1000 mA cm–2, 1 M H2SO4), while the actual service life was up to 3699 h. Under the conditions of initial pH 3.0, Na2SO4 concentration of 0.1 M, current density of 30 mA cm–2, and initial rhodamine B concentration of 20 mg L–1, the color and TOC removal rate of rhodamine B reached 100% and 86.13% within 15 and 30 min, respectively. Rhodamine B was decomposed into acids, esters, and other molecular compounds under the action of •OH and SO4•– free radicals and electrocatalysis, and finally completely mineralized into CO2 and H2O. It is anticipated that this work will yield a novel research concept for producing DSA electrodes with superior catalytic efficacy and elevated stability.
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FUEL
·
2025
·
IF 7.5
Xiaodan Zhang,Yongjun Zhang,Hongjing Han,Yanan Zhang,Haiying Wang,Jiayu Zhang,Xinyu Liu,Yanguang Chen
Great progress has been made in the catalytic cracking of shale oil by introducing metals into zeolites for regulating acidity to tailor the distribution of olefin products. However, the interaction between the loaded bimetals and their synergistic effect with the acid sites of the zeolite remains controversial. In this work, catalysts of highly stable Fe-La bimetals confined in ZSM-35 zeolite (Fe-La-ZSM-35) were constructed with appropriate acidic properties. Real shale oil and n -heptane as a representative reactant were chosen to explore the catalytic cracking performance of these materials. The Fe-La species formed metal sites bonded to the zeolitic framework in the confined microenvironment of ZSM-35, which established strong interactions. Comparing Fe-La-ZSM-35 with Fe/La-ZSM-35 synthesized by the impregnation method revealed that the direct doping method could better incorporate La and Fe species within the zeolite, resulting in stronger interactions between the bimetals and framework aluminum to form a large number of medium-strong Lewis acid sites (Fe-OH). The ratio of Brønsted acid sites to Lewis acid sites decreased from 1.56 in Fe/La-ZSM-35 to 0.45 in Fe-La-ZSM-35. Furthermore, the electron cloud density at the active Fe-OH site increased due to electron transfer from La to Fe, which promoted the adsorption of carbocations, improved stabilisation of carbocations and bimolecular reactions were inhibited. And the C 3 -C 4 bonds of n -heptane molecules were more easily attacked due to the weak acidity of these acid sites, resulting in propylene being the main product as the reaction C 7 H 16 → C 4 H 10 + C 3 H 6 was dominant during the catalytic cracking of n -heptane. The propylene yield of Fe-La-ZSM-35 increased to 35.35% compared with La-ZSM-35 (22.62%) and Fe/La-ZSM-35 (26.16%) at 600°C. During three reaction-regeneration cycles, n -heptane conversion and propylene selectivity were as high as 89.33% and 30.85%. For real light shale oil, the catalyst achieved a propylene yield and selectivity of 19.24% and 31.0%, demonstrating excellent feedstock generalizability. In addition, Fe-La-ZSM-35 exhibited excellent stability, indicating considerable potential for use in the catalytic cracking of real oil.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Suyu Kong,Meili Ding,Mengjiao Yu,Wei Rong,Yang Wang,Jianfeng Yao
Developing high-efficiency adsorbents with sufficient active species to remove phosphate from wastewater is still a significant and formidable challenge. Herein, a metal-ion modification strategy was developed to construct a series of lanthanum (La 3 + )-functionalized zirconium-based metal-organic frameworks containing different functional groups through a one-step solvothermal process. The investigations for the influence of functional groups of ligands on the resulting La species and the role of La(OH) 3 in the phosphate removal are the primary focuses of this research. Unlike the simple La doping in UiO-66, UiO-66-NH 2 and many previously reported MOF systems, La(OH) 3 was in situ formed during the preparation of La-functionalized UiO-66-OH, which was confirmed by powder X-ray diffraction. At room temperature, the optimized 0.5La-UiO-66-OH, with a molar ratio of La 3+ versus the total metal precursor of 0.5, exhibits a desirable adsorption capacity of 219.6 mg g −1 , exceeding those of UiO-66 (146.8 mg g −1 ), UiO-66-OH (158.9 mg g −1 ), and many reported adsorbents. Besides, reusability tests demonstrate that 0.5La-UiO-66-OH can maintain high adsorption performance (96 %) after five cycles and the practical usability of by 0.5La-UiO-66-OH is confirmed using real lake water. In-depth investigations (X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy) on mechanism unveiled that the adsorption of phosphate by 0.5La-UiO-66-OH involved a combined process of electrostatic attraction and ligand exchange. This research presents the first regulation of generating active La species within MOFs through subtle modification and provides valuable insights for wastewater treatment.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Shibo Wu,Jingrui Cao,Yang Zhou,Jiahao He,Jiangjie Zhou,Muslum Demir,Hongye Yang,Zaizai Tong,Pianpian Ma
High-entropy perovskite oxides, an emerging electrocatalytic electrode material, integrates the distinctive features of high-entropy materials and perovskites, offering significant potential in electrocatalysis. While adjusting the B-site elements has been a widely adopted approach for modulating the electrocatalytic activity of HEPs, there was a notable lack of systematic investigations into the role of A-site ions in regulating their electrocatalytic performance. To overcome this deficiency, in the present study, La 1-x Na x (CrMnFeCoNi) 1/5 O 3 HEPs were synthesized using carbon nanotubes-based sacrificial template method. It was found that the Na substitution at the A-site not only significantly reduced the synthesis temperature but also facilitated the preservation of carbon nanotubes. This retention contributed to the formation of a three-dimensional network structure, exposing a greater number of active sites. The Na modification induced significant valence fluctuations at the B-site and tailored the oxygen vacancy concentrations, enhancing the synergistic "cocktail effect" among the various metal atoms. Furthermore, the introduction of Na stimulated the formation of surface M-OOH species, which serve as active intermediates to enhance OER activity. As a result, the Na-modified HEPs demonstrated exceptional OER performance compared to their parent phases. Among these, La 0.6 Na 0.4 (CrMnFeCoNi) 1/5 O 3 (L6N4-5M) sample exhibited a lower overpotential of 313 mV at a current density of 10 mA cm −2 and a Tafel slope of 47.4 mV dec −1 . Additionally, the A-site Na modification strategy and the in-depth investigation of the OER mechanism provide valuable insights for the future design and development of high-performance HEP electrocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Yan Gao,Yiwei Zhang,Yuming Zhou,Chao Zhang,Hongxing Zhang,Shuo Zhao,Jiasheng Fang,Mengqiu Huang,Xiaoli Sheng
In this work, we report a feasible approach to synthesize a ternary nanocomposites , Pt/lanthanum doped mesoporous zirconium oxide (Pt/La 2 O 3 -ZrO 2 ), via an effective two-step method. Ordered mesoporous La 2 O 3 -ZrO 2 composites were firstly fabricated with mesoporous silica KIT-6 as a hard template. Subsequently, uniform Pt nanoparticles encapsulated by 4 hydroxyl-terminated poly (amidoamine) (G4-OH PAMAM) dendrimers were deposited on the La 2 O 3 -ZrO 2 composites. The as-prepared samples were characterized by transmission electron microscope (TEM), N 2 adsorption–desorption isotherm analysis, energy dispersion X-ray analysis (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature programmed reduction (H 2 -TPR). The average size of PtDENs was found to be 1.48 nm in diameter. Furthermore, the introduction of La could improve the structure of the supports which was confirmed by XRD and H 2 -TPR analysis. The reduction of p-nitrophenol to p-aminophenol by NaBH 4 was utilized to evaluate the catalytic performances of catalysts. Results indicated that the Pt/La 2 O 3 -ZrO 2 catalyst calcined in nitrogen at 550 °C exhibited the highest catalytic performance and still kept the high catalytic activity even after six cycles. This phenomenon suggests that synergistic effect among Pt-Zr-La could enhance the catalytic efficiency. Finally, reaction mechanism was proposed for the reduction of p-nitrophenol.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shan Gao,Haidong Yu,Yuewen Zhang,Hongan Ma,Xiaopeng Jia
Thermoelectrics (TE) have received a lot of attention for their ability to directly convert heat into electricity. This capability provides a promising solution for waste heat recovery and clean energy utilization. Strontium titanate (SrTiO 3 ) is a promising N-type oxide TE material. However, its practical application is limited by low electrical conductivity and high thermal conductivity. Here, we present a high-pressure synthesis technique aimed at simultaneously introducing defects as well as enhancing phonon scattering. Enhancing the thermoelectric properties of strontium titanate thermoelectric materials. SrTiO 3 samples doped with different concentrations of La were synthesized by high-pressure high-temperature (HPHT) synthesis, which effectively promotes the solid-phase reaction and thus allows for a more homogeneous and efficient doping of La atoms into the SrTiO 3 lattice as compared to the conventional synthesis method. The introduction of La 3+ creates a charge imbalance, which is compensated by the formation of oxygen vacancies. These oxygen vacancies act as donor defects, which in turn increase the carrier concentration and significantly improve the electrical conductivity of the samples. At the same time, the HPHT synthesis conditions induced severe lattice distortions, leading to grain refinement and the formation of dislocation networks and nanopores. By modulating the density and distribution of multiscale defects, La doping significantly improves the interfacial phonon scattering efficiency. This condition reduces the thermal conductivity and improves the thermoelectric properties. By combining defect engineering and interfacial phonon scattering, we achieved the decoupling of electrical and thermal transport properties in La-doped SrTiO 3 . Consequently, the thermoelectric figure of merit ( zT ) was significantly enhanced, reaching 0.18 at 973 K. This study introduces a new methodology and theoretical foundation for the development of high-performance oxide TE materials.
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Materials Today Bio
·
2022
·
IF 10.761
Lei Han,Xianzhen Dong,Tong Qiu,Zhaona Dou,Lin Wu,Honglian Dai
Wallerian degeneration after peripheral nerve injury (PNI), that is, the autonomous degeneration of distal axons, leads to an imbalance of iron homeostasis and easily induces oxidative stress caused by iron overload. Inspired by the process of nerve degeneration and regeneration, the design of a functional electrospinning scaffold with iron chelating ability exhibited the importance of reconstructing a suitable microenvironment. Here, an electrospinning scaffold based on deferoxamine and poly(3(S)-methyl-morpholine-2,5-dione -co- lactone) (PDPLA/DFO) was constructed. This work aims to explore the promotion of nerve regeneration by the physiological regulation of the scaffold. In vitro , PDPLA/DFO films mitigated the reduction of glutathione and the inactivation of Glutathione peroxidase 4 caused by iron overload. In addition, they decreased reactive oxygen species, relieve the stress of the endoplasmic reticulum and mitochondria, and reduce cell apoptosis. In vivo , PDPLA/DFO conduits constructed the anti-inflammatory microenvironment and promoted cell survival by alleviating iron overload and organelle stress. In conclusion, PDPLA/DFO guidance conduits targeted the distal iron overload and promoted nerve regeneration. It provides novel ideas for designing nerve conduits targeting the distal microenvironment.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
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IF 4.598
Dongyue Feng,Zhijie Shang,Pan Xu,Haoyu Yue,Xinxue Li
The anode materials play a key role in the electrochemical oxidation process. In this work, a new type of Ti/Sn-SbO x /α-PbO 2 /La-In-β-PbO 2 electrode has been prepared through electrodeposition and applied to the degradation of high concentration aqueous solution of hydrolyzed polyacrylamide (HPAM). Scanning electron microscopy (SEM), X-ray diffraction (XRD), and Energy-dispersive spectroscopy (EDS) were employed to characterize the surface morphological and structural properties of the electrodes, which indicated that the La-In-PbO 2 electrode had smaller grain size, denser surface and larger active surface area compared with undoped and single-doped PbO 2 electrode. Cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were also utilized to investigate the electrochemical performance of electrodes. The results showed that the La-In-PbO 2 electrode exhibited higher oxidation peak current, oxygen evolution potential (2.22 V) and lower charge transfer resistance. The La-In-PbO 2 electrodes were used as anode to degrade HPAM solution under different conditions. The results revealed that the viscosity reduction rate of HPAM reached to 97.63 % after 60 min under the condition of electrolyte concentration, initial concentration of HPAM, initial pH and current density were 0.05 M, 3 g·L −1 , 7 and 20 mA·cm −2 , respectively. The kinetic behavior of HPAM degradation was analyzed by the viscosity reduction experiment. The intermediates in the electrochemical oxidation process were identified by GC–MS and the possible degradation mechanism of HPAM was explored by UV–visible absorption spectra and the Fourier Transform Infrared (FT-IR) spectra.
研究领域:
环境工程
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材料科学
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电化学
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