RSC Advances
·
2019
·Vol. 9
·期 18
·10272-10281
·
IF 3.049
Yide Xia,Ying Liu,Nannan Shi,Xungao Zhang
In this article, the catalyst Au/γ-Fe2O3@hydroxyapatite (Au/γ-Fe2O3@HAP) consisting of Au nanoparticles supported on the core–shell structure γ-Fe2O3@HAP was prepared through a deposition–precipitation method. The catalyst was characterized by transmission electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, N2 adsorption–desorption and atomic absorption spectrometry. The as-prepared Au/γ-Fe2O3@HAP exhibited excellent performance for the reduction of 4-nitrophenolate (4-NP) to 4-aminophenolate (4-AP) in the presence of NaBH4 at room temperature. Thermodynamic and kinetic data on the reduction of 4-NP to 4-AP catalyzed by the as-prepared catalyst were studied. The as-prepared catalyst could be easily separated by a magnet and recycled 6 times with over 92% conversion of 4-NP to 4-AP. In addition, the as-prepared catalyst showed excellent catalytic performance on other nitrophenolates. The TOF value of this work on the reduction of 4-NP to 4-AP was 241.3 h−1. Au/γ-Fe2O3@HAP might have a promising potential application on the production of 4-AP and its derivatives.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2024
·Vol. 150
·期 8
·04024038
·
IF 1.6
Jingcheng Wei,Jing Zhang,Bingyan Zhu,Tingfeng Xue,Zejia Song,Sumin Li,Liwei Pan
Activation of peroxymonosulfate (PMS) by catalysts for water treatment is very important for the sulfate radicals-based advanced oxidation technology. Constructing affordable and recyclable transition metal catalysts with high efficiency is highly desirable, but still challenging. In this study, a novel CoAl2O4/Co2O3@γ-Al2O3 catalyst for the activation of PMS was prepared with an excessive impregnation method, and its performance on the catalytic degradation of phenol in water was investigated. The composition and structure of the catalyst were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and N2 adsorption-desorption experiments. It was found that the catalyst could greatly promote the phenol mineralization in water as the total organic carbon removal increased from 4.27% to 57.64% after 60 min of reaction. The presence of Cl− inhibited the catalytic degradation of phenol in water at low concentrations, but promoted the catalytic degradation at high concentrations. However, HCO3− and CO32− revealed inhibitory effects on the catalytic degradation because they could scavenge free radicals in the system. Based on the electron spin resonance technique and the quenching experiments, O12 and SO4−· were identified to be the primary reactive species for the catalytic degradation. The CoAl2O4/Co2O3@γ-Al2O3 could be easily recovered and reused. The toxicity evaluation verified that the toxicity of the treated water was greatly decreased after the catalytic degradation. Therefore, the CoAl2O4/Co2O3@γ-Al2O3 prepared in this study could be an effective catalyst for the catalytic degradation of phenol in water by activating PMS.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2013
·
IF 2.404
Junmin Qian,Xueqing Yong,Weijun Xu,Xinxia Jin
An ideal scaffold in bone tissue-engineering strategy should provide biomimetic extracellular matrix-like architecture and biological properties. Poly( γ -benzyl-L-glutamate) (PBLG) has been a popular model polypeptide for various potential biomedical applications due to its good biocompatibility and biodegradability. This study developed novel bimodal porous PBLG polypeptide scaffolds via a combination of biotemplating method and in situ ring-opening polymerization of γ-benzyl-L-gIutamate N -carboxyanhydride (BLG-NCA). The PBLG scaffolds were characterized by proton nuclear magnetic resonance spectroscopy, X-ray diffraction, differential scanning calorimetry, scanning electron microscope (SEM) and mechanical test. The results showed that the semi-crystalline PBLG scaffolds exhibited an anisotropic porous structure composed of honeycomb-like channels (100–200 μm in diameter) and micropores (5–20 μm), with a very high porosity of 97.4 ± 1.6%. The compressive modulus and glass transition temperature were 402.8 ± 20.6 kPa and 20.2 °C, respectively. The in vitro biocompatibility evaluation with MC3T3-E1 cells using SEM, fluorescent staining and MTT assay revealed that the PBLG scaffolds had good biocompatibility and favored cell attachment, spread and proliferation. Therefore, the bimodal porous polypeptide scaffolds are promising for bone tissue engineering.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2015
·Vol. 54
·期 10
·1348-1356
·
IF 3.113
Mengxiang Zhu,Yanzhi Xu,Chenglong Ge,Ying Ling,Haoyu Tang
A series of OEGylated poly(γ-benzyl- l -glutamate) with different oligo-ethylene-glycol side-chain length, molecular weight (MW = 8.4 × 10 3 to 13.5 × 10 4 ) and narrow molecular weight distribution (PDI = 1.12–1.19) can be readily prepared from triethylamine initiated ring-opening polymerization of OEGylated γ-benzyl- l -glutamic acid based N -carboxyanhydride. FTIR analysis revealed that the polymers adopted α-helical conformation in the solid-state. While they showed poor solubility in water, they exhibited a reversible upper critical solution temperature (UCST)-type phase behavior in various alcoholic organic solvents (i.e., methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, and isopropanol). Variable-temperature UV–vis analysis revealed that the UCST-type transition temperatures ( T pt s) of the resulting polymers were highly dependent on the type of solvent, polymer concentration, side- and main-chain length. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54 , 1348-1356
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Xuying Bian,Hualiang An,Xinqiang Zhao,Yanji Wang
The selective hydrogenation of dimethyl toluene-2,4-dicarbamate (TDC) to methyl cyclohexyl-2,4-dicarbamate (HTDC) is an important process for non-phosgene synthesis of methylcyclohexane-2,4-diisocyanate (HTDI). We prepared Rh/γ-Al 2 O 3 catalysts with an Rh particle size of 1.8–6.7 nm and studied size effect on TDC selective hydrogenation. The results showed that the catalytic activities of Rh/γ-Al 2 O 3 increase monotonously with increasing Rh particle size. This demonstrated that Rh/γ-Al 2 O 3 catalyst dedicates a negative size effect or an antipathetic structure sensitivity. Based on the characterization, we found that the geometric property of Rh is the main factor affecting the activity of catalyst. Combined with the proposed Rh particle model, it was inferred that the Rh (111) plays a major role in the TDC selective hydrogenation and the terrace sites are beneficial to promote the adsorption of TDC. The study on size effect can provide a guidance for the design and preparation of highly efficient Rh-based catalysts for TDC selective hydrogenation.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Hao Lu,Xinlei Yao,Jing Li,Shuiliang Yao,Zuliang Wu,Huanhuan Zhang,Hanghao Lin,Tomohiro Nozaki
Plasma-catalytic oxidation of particulate matter (PM) has potential applications for diesel exhaust cleaning. There is a grand requirement to explore the mechanism of carbonaceous PM oxidation for the development of plasma catalysts. Herein, Au/γ-Al 2 O 3 was used to catalyze the gasification of the graphitic carbon. A modified diffuse reflectance infrared Fourier transform spectrometer equipped with a mass spectrometer was originally utilized to in situ characterize the surface intermediates of graphite on Au/γ-Al 2 O 3 and the gaseous products during the discharges processes in the O 2 -He balanced gases. It was found that O atoms and O 3 play important roles in the formation of surface oxygen complexes (SOCs) and facilitate the gasification of SOCs to CO 2 in the presence of Au/γ-Al 2 O 3 . The findings are helpful to understand the plasma-catalytic oxidation mechanism of PM and further develop efficient plasma catalysts.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 24
·245401
·
IF 3.5
Wenjing Fu,Cundi Wei,Shaonan Xu,Enhui Wang,Jinyi Zhang,You Xu,Jiyuan Zou,Jilun Wei,Jing Zuo
A particular bird's nest-like pseudo-boehmite (PB) composed of cohesive nanostrips was prepared by a novel and facile approach based on the reaction of Al–Ga–In–Sn alloy and water, together with ammonium carbonate. The PB possesses a large specific surface area (465.2 m2 g−1), pore volume (1.0 cm3 g−1), and pore diameter (8.7 nm). Subsequently, it was utilized as a precursor to form the TiO2/γ-Al2O3 nanocomposite for tetracycline hydrochloride removal. The removal efficiency can reach above 90% at TiO2:PB = 1:1.5 under the Sunlight irradiation simulated by a LED lamp. Our results indicate that the nest-like PB is a promising carrier precursor for efficient nanocomposite catalysts.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ke Song,Liyan Xue,Minzhong Huang,Kaixian Wang,Zhiyi Wang,Haiying Xin,Fan Yang,Fengzhi Tan,Heng Chen
The development of multifunctional protective materials with electromagnetic wave absorption and (n, γ) radiation shielding properties is urgently required to guarantee secure functioning of space nuclear power sources. In this work, the multicomponent perovskite ferrites (Ca 0.2 Nd 0.2 Gd 0.2 Yb 0.2 Bi 0.2 )FeO 3 (RE-1), (Ca 0.2 Nd 0.2 Gd 0.2 Ho 0.2 Bi 0.2 )FeO 3 (RE-2), and (Ca 0.2 Nd 0.2 Gd 0.2 Ho 0.2 Bi 0.2 ) (Fe 0.9 Ti 0.1 )O 3 (RE-3) were prepared by the sol-gel method. Through multicomponent regulation, the dipole polarization and interfacial electronic transitions can be affected by the lattice distortion effect, which enhances the electromagnetic wave absorption characteristics. With an effective absorption bandwidth of 2.92 GHz and a minimum reflection loss of −46.94 dB, RE-3 exhibits the most efficient electromagnetic wave absorption of the three manufactured samples. Regarding the shielding of neutrons, the shielding efficiency of the RE-3 (45 wt%)-polypropylene (RE-3/PP 3 ) reached 99.78 %, which is mainly due to the large neutron absorption cross section of the rare-earth element Gd. With respect to the γ-ray protection capabilities, the lead equivalent values for the RE-3/PP 3 composites are 0.5083 mmPb at a 65 keV energy when narrow-band filtered X-rays are used and 1.1977 mmPb at a 1250 keV energy when a 60 Co gamma source is used. These findings indicate that multicomponent regulation can enhance the Compton effect by altering the valence electron coverage space and that rare-earth elements significantly improve the γ-ray shielding effectiveness of a material in the weak absorption region of lead. In this work, the integration of electromagnetic wave absorption and (n, γ) radiation shielding properties was achieved by multicomponent regulation, which provides a novel tactic for the developing multifunctional protective materials used in the field of deep space exploration.
研究领域:
材料科学
·
核物理学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-14
·
IF 15.7
Zou Zhijuan,Liu Pengfei,Dou Ruiyang,Liu Kaijun,Wang Yunlong,Song Lixian,Tong Liping,Yin Guolu,Kang Wenbin,Cai Wenlong,Zhang Yaping,Chen Hongbing,Song Yingze
Binders are essential for maintaining positive electrode integrity in Li||S batteries and significantly affect their performance. However, commercial linear binders often have disordered networks, poor binding efficiency, and insufficient mechanical strength. To address these challenges, three-dimensional covalent binders offer a promising solution. Traditional methods for producing cross-linked binders require additives and result in poorly controlled polymer networks due to the stochastic nature of liquid-phase polymerization. Moreover, the mechanisms by which reticulated binders stabilize the positive electrode remain unclear, requiring investigation under operando conditions. Herein, we present an approach to tailor cross-linked polyacrylamide networks using solid-state operando γ-ray irradiation chemistry, which eliminates additives and produces a pure, ordered network with remarkable binding capabilities. By integrating in situ high-resolution optical frequency domain reflectometry, multiscale synchrotron radiation characterization, and virtual simulations, this study reveals the role of binders in dynamically encaging and confining sulfur. Specifically, γ-ray-enabled polyacrylamide networks enhance battery performance through mechanical strengthening, optimized sulfur regeneration, and improved re-occupancy. Consequently, the well-designed composite positive electrode structure with only 5.0 wt% binder improves soft-packaged Li||S battery performance across various scenarios. Notably, a 1.2-Ah pouch cell achieves 410.1 Wh kg −1 specific energy with a low electrolyte/sulfur ratio of 3.0 µL mg –1 .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2024
·
IF 3.1
Yu Zuolong,Chen Yao,Chen Yongfei,Wei Yunxiao,Fu Changchun,Liu Dan,Niranjan Keshavan,Han Chao
Six types of γ-polyglutamic acid (γ-PGA)/cold water-soluble starch (St) composite film models were constructed using molecular dynamics simulation, and their properties were investigated and compared with the corresponding experimental values. The compatibility between the composite film components was analyzed using the radial distribution function and mean square displacement (MSD). The hydrogen-bond number and bond energy were used to track the film-formation process. The mechanical property data of the films were extracted, and MSD was used to analyze the permeability of the film to carbon dioxide, oxygen, water vapor, and carbon-16 saturated fatty acids. Finally, the simulated values of mechanical properties and permeability were compared with the experimental values. The results demonstrated that γ-PGA is well compatible with St. The intramolecular and intermolecular hydrogen bonds of γ-PGA and St did not change considerably during the film-formation process. The simulated values of the mechanical properties exhibited a similar trend as the experimental values; however, in terms of permeability, a difference was observed between the initial values of the simulated design and actual material parameters, as well as the complexity of the experiment.
研究领域:
材料科学
·
食品科学
·
生物物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2024
·
IF 4.8
Xue Zhou,Yueying Chu,Chao Wang,Qiang Wang,Min Hu,Jun Xu,Feng Deng
γ-Al2O3 is a crucial catalyst widely used in industrial alcohol dehydration processes. However, the specific nature of its active sites has remained unclear. In this study, we utilize two-dimensional heteronuclear correlation solid-state nuclear magnetic resonance and density functional theory calculations to uncover the active Al sites on the surface of γ-Al2O3 that facilitate ethanol dehydration. We show the formation of stable pentacoordinated AlV–ethanol complexes upon the adsorption of ethanol on the tetracoordinated AlIV sites. This interaction significantly enhances synergy with adjacent AlV–OH sites, resulting in a marked reduction of the activation energy barrier for ethene production. Furthermore, we reveal an interchange between AlIV and AlV–OH species, allowing hexacoordinated AlVI–OH sites to participate in the dehydration pathway through the migration of ethanol between these coordination sites.
研究领域:
催化化学
·
物理化学
·
固态核磁共振光谱
·
密度泛函理论
·
表面化学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Yukun Zhang,Chong Chen,Changjiang Hu,Jianfeng Zhao,Jun Ma
Photoreduction conversion of soluble U(VI) to insoluble U(IV) is regarded as an ideal strategy for removing uranium from water. The Cyanide-based photocatalysts shows promises for efficient uranium removal but their green synthesis remain significant challenges. Herein, we develop a γ-irradiation-induced strategy for in-situ -CN generation via imidazole ring opening in ZIF-8 MOFs for uranium photoreduction, circumventing the use of toxic cyanide sources. In-situ transmission electron microscopy (TEM) and in-situ X-rays coupled diffraction infrared Fourier transform (DRIFT) reveal morphological evolution via imidazole ring cleavage and -CN formation kinetics during irradiation. Research indicated that -CN-functionalized ZIF-8 displayed superior uranium photoreduction activity through -CN-UO22+ complexation and promotion of photo-induced electron transfer. Impressively, the uranium extraction capacity reached a value of 1532.4 mg/g, higher than most existing MOF-type photocatalysts. In-situ DRIFT spectroscopy revealed the intermediates of the photoreduction uranium reaction and their adsorption mode with the catalyst, providing a comprehensive mechanistic explanation. This work provides a sustainable pathway for uranium photoreduction and guidance for the green design of MOF-type photocatalysts.
研究领域:
环境科学
·
核化学
·
材料化学
·
光催化
·
放射化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）