CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Binghao Wang,Yuzhi Zhang,Xinyu Wang,Jiayu Ma,Maofei Zhang,Lingnan Wu,Changchun Chen
Infrared radiation materials occupy an important position in energy saving of industrial furnaces and thermal protection of spacecraft, but the existing IR radiation materials can hardly satisfy the dual requirements of high emissivity in a wide band and excellent thermal stability at the same time. Here, high-entropy perovskite oxides A(Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 Cu 0.2 )O 3 (A = La, Y) are prepared using solid-phase synthesis. The introduction of the high-entropy design provides the cationic valence behavior, increases oxygen vacancy concentration and reduces the symmetry of the lattice vibration, thus narrowing the band gap, increasing the free carrier concentration, and improving the lattice vibration. This enhances the material's intrinsic absorption, carrier absorption, and lattice vibration absorption, ultimately resulting in a material with high emissivity in a wide band. Among them, La(Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 Cu 0.2 )O 3 shows an emissivity of 0.864 at 0.78–3 μm and 0.855 at 3–8 μm, respectively. Moreover, it exhibits stronger thermal stability, and its emissivity shows an upward trend with the increase of temperature, which highlights the key role of A-site cations in regulating lattice distortion and defect dynamics. This work provides a new paradigm for designing materials with IR radiation performance for service in high-temperature environments.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Zhangtao Liu,Shuhan Fu,Yuhui Wang,Zhenyang Xu,Yueguang Chen,Ning Xiao,Shangyi Li,Tingting Zhang
A novel spin-state engineering strategy was developed via La doping to break the “oxo wall” and boost high-valent Co(IV)=O generation for efficient per- and polyfluoroalkyl substances (PFASs) degradation. This was achieved by constructing unsaturated CoO 3 single atoms anchored on La-doped MCM-48 (CoLa@MCM-48) via one-pot synthesis, which enabled synergistic activation of peroxymonosulfate and ozone. The optimized catalyst achieved 99.5 % degradation of PFASs substitute sodium p-perfluorous nonenoxybenzene sulfonate (OBS) in 30 min, while maintaining robust performance across diverse water matrices. The incorporation of La induces asymmetric lattice strain through its large ionic radius and spin-orbit coupling, transforming the Co coordination geometry from conventional octahedral symmetry to an unsaturated trigonal planar CoO 3 configuration with a high-spin state, thereby enhancing the 88.8 % generation of Co(IV)=O. This work establishes heteroatom-mediated spin-state engineering for designing high-performance non-radical catalysts to remediate recalcitrant pollutants.
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FUEL
·
2024
·
IF 6.7
Xiao Chen,Rongrong Li,Zhengwen Hu,Ying Zhong,Deng Hu,Changhai Liang
The selective activation of targeted bonds within renewable biomass-derived furanic compounds for the production of high-value alkyl diols holds significant importance for biomass upgrading, necessitating well-defined catalysts and clearly defined catalytically active sites. Herein, 1,5-pentanediol is synthesized through the selective hydrogenolysis of furfural-derived tetrahydrofurfuryl alcohol utilizing Ni-Co/La(OH) x bimetallic catalysts. The La(OH) x with abundant defect sites polarizes Ni-Co alloy for heterocracking of H 2 , as well as leads to expose more interfacial NiCo-O V -La 3+ sites. By harnessing the synergistic interplay between the alloy sites and the interfacial sites, the optimized Ni 4 Co 1 /La(OH) x bimetallic catalyst markedly enhances the adsorption of –OH groups in tetrahydrofurfuryl alcohol and facilitates the selective assault of active H species on the C-O-C bonds within tetrahydrofuran rings. This approach markedly elevates the selective hydrogenolysis of tetrahydrofurfuryl alcohol to 1,5-pentanediol, attaining an exceptional selectivity of 88.6 % with a conversion of 98.1 % for tetrahydrofurfuryl alcohol. Furthermore, the Ni 4 Co 1 /La(OH) x bimetallic catalyst demonstrates exceptional performance in the one-pot hydrogenation-hydrogenolysis of furfural to 1,5-pentanediol, exhibiting a low activation energy of 17.77 kJ/mol and a high turnover frequency of 192.1 h −1 . Notably, the Ni 4 Co 1 /La(OH) x bimetallic catalyst showcases remarkable stability. This outcome provides invaluable insights for the advancement of a sustainable process to produce diol monomers from renewable resources with a low carbon footprint.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yunlei Cen,Yuanyuan Zhou,Mingshi Zhu,Ke Zheng,Shaoqi Zhou
In this work, Ti/TiO2-RNTs/SnO2–Sb–Ni-La electrodes were developed in three deposition stages. TiO2-RNTs improved the bonding of the bottom layer, and Ni–La codoping resulted in higher film stability. Compared with other electrodes, this electrode exhibits excellent performance with a denser structure, higher OEP (2.17 V), lower Rct (5.36 Ω), longer electrode strengthening life, and larger active specific surface area. The degradation of oily wastewater revealed an oil removal rate equal to 97.88% under optimal conditions. In comparison to the Ti/TiO2-RNTs/SnO2–Sb obtained via the one-step hydrothermal technique, the service life improved by 8.60 times, and the degradation rate (RD) of the current electrode (k = 0.0254 min–1) was enhanced by 2.67 times, whereas the removal rate remained stable after 10 cycles. Under the continuous attack of free radicals such as •OH, 48 types of organic matter in wash oil were decomposed, and most of the alkanes and polycyclic aromatic hydrocarbons were mineralized. Compared with direct current, pulse current electrolysis of the oil-washing wastewater can save 47.95% electrical energy, and the energy consumption of chemical oxygen demand removal per unit mass can be reduced by 72.02%. Therefore, the Ti/TiO2-RNTs/SnO2–Sb–Ni-La pulse electrochemical oxidation method is expected to reduce energy loss and improve the electrochemical treatment of oily wastewater.
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PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Shuo Yan,Yuhong Chen,Ziqiang Yin,Binwei Huang,Quanxing Ren,Tihao Cao,Xuxin Ping,Ruibin Liu,Zhengren Huang,Qing Huang,Yinsheng Li
SiC ceramics were fabricated by spark plasma sintering of β-SiC powder with various rare-earth (RE = La, Gd, Yb, Sc) oxides and magnesia additives. The phase compositions, microstructures, lattice oxygen contents, and thermal conductivities were systematically investigated. A decrease in the cationic radius of rare-earth element resulted in an increased cationic field strength. This enhanced attraction to oxygen anion led to higher viscosity and improved high-temperature stability of the intergranular RE-Mg-Si-O liquid phase. After sintering at 1850°C, influenced by liquid-phase viscosity, the degree of β→α phase transformation in SiC and the grain size decreased with decreasing cationic radius of rare-earth element. After sintering at 2050°C, the liquid-phase viscosity significantly decreased, but volatilization became pronounced. The extent of β→α phase transformation and the grain size were affected by both liquid-phase viscosity and volatility. Larger grain size and higher affinity of rare-earth cations for oxygen anions contributed to reduce lattice oxygen content. The thermal conductivities of the SiC ceramics ranged from 192 to 229 W/mK. Notably, the SiC ceramic with Yb 2 O 3 -MgO additives exhibited the largest grain size, the lowest lattice oxygen content, and the elimination of β/α heterophase boundaries, thereby achieving the highest thermal conductivity of 229 W/mK.
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高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Lei Tan,Zengjin Fu,Jing Wang,Wenyue Jiao,Tianwen Huang,Yan Hao,Yicheng Wang,Tingrui Lin
In this paper, poly(sodium styrene sulfonate) (PSS) hydrogel was synthesized following a one-step free-radical polymerization with N, N -methylene-bis-acrylamide (MBA) as a cross-linker. La(III) and Ce(III) were effectively removed from acidic aqueous solutions by using PSS hydrogel. FTIR, TGA, XRD, SEM, zeta potential analysis, and XPS were used to characterize the morphology and microstructure of PSS hydrogel. By varying pH, adsorbent dose, contact time, initial La(III) and Ce(III) ions concentrations, and interfering ions, the adsorption behavior of La(III) and Ce(III) ions on PSS hydrogel was studied. According to the experimental data, PSS hydrogel exhibited adsorption capacities above 200 mg·g −1 for La(III) and 180 mg·g −1 for Ce(III) over a wide pH range. Furthermore, adsorption data was simulated using pseudo-first order, pseudo-second order and intra-particle diffusion kinetic equations. For the description of adsorption equilibrium, Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isothermal models were used. According to the results, the Langmuir isotherm equation provided the best fit. Based on the Langmuir isotherm equation, the maximum absorption capacities of La(III) and Ce(III) by PSS hydrogel was 241.0 and 223.7 mg·g −1 , respectively. According to FTIR and XPS analysis, sulfonic acid groups were involved in the adsorption of La(III) and Ce(III) ions. And ion exchange and complexation were the main mechanisms involved. Finally, reusability tests reveal that the PSS hydrogel can be reused 13 times without losing effectiveness.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Xixiang Liu,Xiurong Chen,Yongming Luo,Caiyun Han,SuFang He
Much research has focused on the removal of individual contaminants such as As(V) or Cr(VI) from wastewater. However, limited efforts have been devoted to their simultaneous removal in binary systems. This is largely due to the complexity of wastewater matrices and the similar chemical characteristics of As(V) and Cr(VI). In this study, La-modified UiO-66 was synthesized by a one-pot method and employed as a multifunctional adsorbent to simultaneously remove As(V) and Cr(VI) via batch experiments. Characterization results demonstrated that La was successfully grafted onto UiO-66 through Zr-ligand (O)-La and Zr-ligand (O)-Zr linkages, while the fcu structural topology and microporous nature of UiO-66 were well remained. For simultaneous uptake of As(V) and Cr(VI), a synergistic effect of Cr(VI) was observed on As(V) removal, whereas As(V) exhibited an inhibitory effect on Cr(VI) adsorption. Compared with the single component system, the adsorption capacity of As(V) in the binary system increased by approximately 26 %, while the adsorption capacity of Cr(VI) decreased by about 20 %. The enhanced uptake of As(V) was attributed to the formation of a new Cr As complex compound between adsorbed Cr(III) and As(V). In contrast, the inhibitory influence of As(V) on Cr(VI) adsorption was ascribed to the strong affinity of As(V) for the active adsorption sites. Overall, these results demonstrate that La-modified UiO-66 is a promising candidate for the simultaneous removal of As(V) and Cr(VI) in binary systems, particularly under conditions of elevated As(V) concentration.
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Biomaterials Science
·
2022
·Vol. 10
·期 21
·6230-6243
·
IF 7.59
Yuanji Feng,Zhaopei Guo,Jie Chen,Sijia Zhang,Jiayan Wu,Huayu Tian,Xuesi Chen
To improve the efficiency of nucleic acid and protein delivery by cationic polymers, there is a trade-off between increasing the positive charge density of cationic polymers and decreasing cytotoxicity. In this work, a strategy to introduce multiple interactions between the cell membrane and a delivery system based on cationic polymers was proposed. A novel delivery system consisting of PEI1.8k and an enhancer (LA-RT) was fabricated. The introduction of LA-RT contributed to multiple interactions between the delivery system and the cell membrane including electrostatic interactions, hydrogen bonding, hydrophobic interaction, and dynamic sulfur exchange reactions, which enabled efficient intracellular delivery of nucleic acids and proteins. For nucleic acid delivery, plasmid DNA and mRNA were loaded to realize CRISPR/Cas 9 gene editing in vivo and protein expression in vivo, respectively. For protein delivery, the delivery system carrying OVA protein and CpG formed a nano-vaccine, which induced enhanced humoral and cellular immunity in vivo. In addition, the delivery system based on PEI1.8k revealed negligible cytotoxicity. This work provided a novel strategy to prepare efficient delivery systems based on cationic polymers via the introduction of a multifunctional enhancer.
研究领域:
药学
·
分子生物学
·
生物技术
·
免疫学
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高影响因子
RSC Advances
·
2022
·Vol. 12
·期 55
·35517-35530
·
IF 4.036
Ziguang Zheng,Xiaomei Jiang,Xiaowei Yang,Min Ma,Siping Ji,Fengzhi Jiang
The metal or metal clusters and organic ligands are relevant to the selectivity and performance of phosphate removal in MOFs, and the electron structure, chemical characteristics, and preparation method also affect efficiency and commercial promotion. However, few reports focus on the above, especially for 2D MOF nanomaterials. In this work, two 2D Ln-TDA (Ln = La, Ce) nanosheets assembled via microwave- and ultrasonic-assisted methods are employed as adsorbents for phosphate (H2PO4−, HPO42−) removal for the first time. Their microstructure and performance were characterized using XRD, TEM, SEM, AFM, FTIR, zeta potential, and DFT calculations. The prepared 2D Ln-TDA (Ln = La, Ce) nanosheets exposed more adsorption sites and effectively reduced the restrictions of mass transfer. Based on this, the Langmuir model was employed to estimate the maximum adsorption capacities of the two kinds of nanosheets, which reached 253.5 mg g−1 and 259.5 mg g−1, which are 553 times and 3054 times larger than those for bulk Ln-TDA (Ln = La, Ce), respectively. Additionally, the kinetic data showed that the adsorption equilibrium time is fast, approximately 15 min by the pseudo-second-order model. In addition, the prepared products not only have a wide application range (pH = 3–9) but also offer eco-safety in terms of residuals (no Ln leak out). Based on the XPS spectra, FTIR spectra and DFT calculations, the main adsorption mechanisms included ligand exchange and electrostatic interactions. This new insight provides a novel strategy to prepare 2D MOF adsorbents, achieving a more eco-friendly method (microwave- and ultrasonic-assisted synthesis) for preparing 2D Ln-based MOF nanosheets by coordinative unsaturation to boost phosphate adsorption.
研究领域:
材料科学
·
环境科学
·
化学
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 35
·13967-13978
·
IF 3.069
Qiang Ning,Huaike Zhang,Yurong He,Zhiqiang Chen,Suyao Liu,Jie Ren
Small Pt particles (about 1.2 nm) were highly dispersed on ZSM-22 zeolites via a strong electrostatic adsorption (SEA) method and exhibited a promotion effect on the catalytic performance in n-dodecane isomerization in comparison with the conventional catalyst. Several promoters (Ce, La, and Re) were introduced to further improve the aggregation resistance of the small Pt particles. A series of characterization including H2-TPR, XPS and STEM as well as DFT calculations provided solid evidence that the strong interaction between Pt and promoter species not only effectively hinders the Pt aggregation but also alters the electronic state of the Pt sites. Moreover, Ce and La promoters also lead to a slightly improved amount of B acid sites determined by Py-FTIR. Thus, improved activity and selectivity were achieved on a Ce-modified catalyst due to the better balanced bifunctionality between the slightly increased acidity of zeolites and electron-deficiency of Pt. The electron-rich Pt sites are responsible for the significant increase of CH4 selectivity and the decrease of total isomer selectivity in n-dodecane isomerization. In addition, a high-temperature reduction test revealed the higher isomerization activity and selectivity (about 10% higher than the unmodified catalyst) of the Ce-modified catalyst owing to the strong bond of Pt–O–Ce, further confirming the positive effect of the Ce promoter on the sintering resistance of small Pt particles.
研究领域:
催化化学
·
材料科学
·
计算化学
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RSC Advances
·
2015
·Vol. 5
·期 41
·32826-32834
·
IF 3.84
Yanan Wang,Xuewei Lang,Guoqing Zhao,Huanhui Chen,Yiwei Fan,Linqing Yu,Xiuxiu Ma,Zhirong Zhu
A variety of cesium supported catalysts with amorphous SiO2 as a carrier were prepared by vacuum impregnation and ultrasonic impregnation methods, which were used for the synthesis of methyl acrylate by aldol condensation of methyl acetate and formaldehyde. The as-prepared catalysts were characterized by XRD, N2 adsorption–desorption, NH3-TPD, CO2-TPD, XPS, ICP and TG. The results indicated that the bifunctional Cs–La–Sb/SiO2 showed a high conversion of methyl acetate as well as a high yield of methyl acrylate, which was attributed to the weak acid–base sites and the formation of basic Cs–O–Si species with the addition of antimony and lanthanum, respectively. Furthermore, Cs–La–Sb/SiO2-(V) prepared by vacuum impregnation showed a high initial catalytic activity, but its activity sharply decreased due to the loss of active species. Comparatively, Cs–La–Sb/SiO2-(U) prepared by ultrasonic impregnation showed a good stability owing to the cavitation effect of ultrasonic waves. The conversion of methyl acetate and yield of methyl acrylate remained above 20% and 9.0% (based on methyl acetate) for 100 h without obvious deactivation. Moreover, carbon deposition was the main factor for the deactivation of Cs–La–Sb/SiO2-(U), and the coked catalyst could be regenerated by calcination in air.
研究领域:
催化化学
·
材料科学
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2015
·
IF 2.133
Xinshan Rong,Fengxian Qiu,Jian Rong,Jie Yan,Hao Zhao,Xiaolu Zhu,Dongya Yang
A series of porous g-C 3 N 4 /La (PGCN/La) materials used as photocatalyst for the degradation of phenol were prepared by two steps. The photocatalysts were characterized by X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (DRS), thermogravimetry (TG), Brunauer–Emmett–Teller (BET), Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). From the TEM morphology, the porous structure of g-C 3 N 4 could be successfully controlled; from BET results, BET specific surface area of porous g-C 3 N 4 (PGCN) sample increases with the increasing of urea mass ratio. Compared with PGCN material (PGCN-50), PGCN/La sample (PGCN-50/La-5) could exhibit an enhanced photocatalytic activity and has the best degradation efficiency of 98.6% within 50 min under visible light irradiation. Photocatalytic reaction follows the first-order model kinetics ; and PGCN-50/La-5 photocatalyst shows the largest reaction rate among all samples which is nearly 2.96 times higher than that of pure PGCN-50. The present work illustrates that the photocatalytic activity of porous g-C 3 N 4 was improved by the addition of La and PGCN-50/La-5 has potential application in the removal of phenol or other organic molecular from wastewater.
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