JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Yiqing Zeng,Yanan Wang,Shule Zhang,Qin Zhong,Weilong Rong,Xiaohai Li
In this work, novel (CeO 2 ) x -(CePO 4 ) 1−x (defined as Ce x P 1−x ) nanorod composites were prepared by a simple co-precipitation method, and the influence of CeO 2 on the catalytic performance of CePO 4 for selective catalytic reduction of NO by NH 3 (NH 3 -SCR of NO) was investigated. The catalytic performance evaluation revealed that the Ce x P 1−x catalysts, especially Ce 0.2 P 0.8 exhibited a much better catalytic activity and H 2 O + SO 2 resistance than CePO 4 . Structure characterizations via high-resolution transmission electron microscope (HRTEM) and Brunauer-Emmett-Teller (BET) revealed that the introduction of CeO 2 had a little effect on the shape of CePO 4 nanorods and it could promote the formation of new mesoporous then significantly enhance the surface area of catalyst. The analysis results of active sites suggested that phosphorus was the main adsorption site for NH 3 and the redox sites were controlled by CeO 2 on Ce x P 1−x catalysts. Finally, reaction process study demonstrated that the NH 3 -SCR over Ce x P 1−x was processed via Langmuir-Hinshelwood (L-H) mechanism. Combining the results of active sites and reaction mechanism analysis, it was drawn that the superior low temperature activity of Ce x P 1−x could be attributed to its excellent redox properties, which promoted the oxidation of NO then facilitated the process of NH 3 -SCR via “fast SCR”.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Tao Zhang,Sujie Shan,Dongqing Liu,Yu Han,Kai Sun,Wei Wang
Under the double pressure of eutrophication and phosphorus deficiency, there is an urgent need to remove excess phosphate from wastewater efficiently. Preparing cerium-based materials with excellent application potential inevitably leads to Ce(III) oxidation to Ce(IV), which reduces the phosphate adsorption effect and restricts its development. To solve this problem, we introduced a protective agent and successfully synthesised cerium-modified activated carbon sorbent containing 100 % Ce(III) during the synthesis process. Compared with CeAC without a protecting agent, CeAC-A contained more Ce(III) (100 %) and exchange groups (–OH accounted for 82.76 %), achieving an adsorption capacity of up to 448.57 mg-P/g Ce, improving of 4.3 times. At the same time, the size of the cerium active component was reduced from the micron level to the nanometer level, and the mass transfer rate was significantly improved. In addition, with the enormous specific surface area and well-developed pore structure of activated carbon, it showed high dispersibility, with P/Ce molar ratio as high as 2.03, which is 1.1–4.8 times higher than other cerium-based adsorbents. Phosphate was removed primarily through electrostatic attraction and ligand exchange. In treating municipal wastewater with complex water quality, CeAC-A showed strong selectivity, a wide range of adaptability and easy repeat regeneration, making it a promising adsorbent for phosphate uptake from wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2025
·
IF 7.3
Ning Li,Linzi Zuo,Fanchao Xu,Xiaolei Qu,Heyun Fu,Huiting Liu
Cerium sulfide (Ce 2 S 3 ) pigment is an environmentally friendly novel inorganic red-colored metal pigment, representing a potential alternative to traditional heavy metal pigments. In this study, we report concurrent re-precipitation and photo-dissolution of cerium sulfide pigment in a sunlit aquatic phase. Commercial cerium sulfide pigment transforms into its re-precipitation product, CeCO 3 OH, along with the generation of H 2 S gas in its re-precipitation process. Simultaneously, cerium sulfide pigment photo-dissolution results in a significant release of Ce ions. After 4 hours of simulated sunlight irradiation, the particle size of cerium sulfide pigment significantly reduces, and 10.4% of elemental Ce is released into the solution as free Ce ions. The key photo-dissolution mechanism is the oxidation reaction between photogenerated holes and the crystal lattice of the pigment. Cerium sulfide pigment and its re-precipitation product, CeCO 3 OH, can be excited by specific wavelengths in the solar spectrum, mediating the pigment photo-dissolution. UV light shielding can inhibit the cerium sulfide pigment photo-dissolution. Superoxide and hydroxyl radicals are generated during the photoreaction process, in which the hydroxyl radical may oxidize the photo-induced released Ce(III) to Ce(IV) and the re-precipitation-generated H 2 S to SO 4 2- . Our research indicates that commercial cerium sulfide pigment undergoes a series of transformation processes in aquatic environments, potentially posing certain environmental risks.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yangjian Cheng,Tingting Zhang,Li Zhang,Zhibin Ke,Libor Kovarik,Hailiang Dong
Cerium is a critical element to modern technologies . Nowadays, its increased applications have led to elevated levels in the environment. Cerium recovery by microorganisms has gained a great deal of attention. Here, our research showed that Bacillus licheniformis could be used to recover Ce 3+ from aqueous solution. The adsorption capacity of cerium on this bacterial strain achieved 38.93 mg/g (dry weight) biomass. Adsorption kinetics followed a pseudo-second-order rate model, and adsorption isotherm was fitted well with the Freundlich model. Scanning electron microscope (SEM) observations coupled with X-ray energy dispersive spectroscopy (EDS) analysis revealed a spatial association of Ce with C, N, O, S, and P. Fourier transform infrared spectroscopy (FT-IR) analysis further suggested that the phosphate and carboxyl groups on the cell surface might be responsible for the adsorption of cerium. Furthermore, X-ray diffraction (XRD) and transmission electron microscopy (TEM) with electron energy loss spectroscopy (EELS) suggested that cerium initially occurred on the bacterial cell surface as Ce(OH) 3 , which was mainly converted to monazite (CePO 4 ) and a small amount of CeO 2 overtime. Hydrothermal treatment was used to accelerate the mineralization process of cerium by B. licheniformis . The hydrothermal treatment is conducted for comparative analysis of mineralization process in extreme geological condition.
研究领域:
微生物学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2022
·Vol. 29
·期 2
·549-561
·
IF 2.961
Zhang Xiang,Hu Guorong,Du Ke,Peng Zhongdong,Wang Weigang,Tan Chaopu,Wang Yongzhi,Cao Yanbing
Structural and interfacial instabilities hinder the large-scale application of Ni-rich layered LiNi 1-x Co x Mn y O 2 ( x + y ≤ 0.4) cathode materials to electric vehicle (EV). Therefore, this manuscript introduces synergistic modification of Ce doping and CeO 2 coating to enhance electrochemical performance of LiNi 0.9 Co 0.05 Mn 0.05 O 2 cathode material. Ce doping improves the inner structure stability, reduces the cation mixing, and extends the lithium ion diffusion pathway due to high bond dissociation energy of Ce–O and large rad radius of cerium ion. CeO 2 coating layer protects the cathode/electrolyte interface from side reactions. The testing results of SEM, XPS, etc. prove that Ce doping and coating are introduced into LiNi 0.9 Co 0.05 Mn 0.05 O 2 cathode material successfully. Ce doping and coating modification enhance cycling performance. The capacity retention of modified sample is 93.3% at 1 C rate between 2.8 and 4.3 V after 100 cycles. The synergistic effects of cerium doping and ceria coating modification on the electrochemical performance and structural stability could be extended to develop high capacity cathode.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 5
·549
·
IF 4.501
Li Wang,Junbo Wang,Heping Cheng,Xiangxiang Zhou,Zhen Ma
A series of Ce1−xFexVO4(x = 0, 0.25, 0.50, 0.75, 1) catalysts prepared by modified hydrothermal synthesis were used for selective catalytic reduction (SCR) of NOxwith NH3. Among them, Ce0.5Fe0.5VO4showed the highest catalytic activity. The catalysts were characterized by X-ray diffraction (XRD), N2adsorption–desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction using H2(H2-TPR), and temperature-programmed desorption of NH3(NH3-TPD). The results indicated the formation of Ce-Fe-V-O solid solutions. The average oxidation states (AOS) of Ce, Fe, V, and O atoms changed obviously with the incorporation of Fe3+into CeVO4, and the acidity of Ce0.5Fe0.5VO4differs from that of CeVO4and FeVO4. The presence of more acid sites and a sharp increase in active oxygen species in Ce0.5Fe0.5VO4effectively improved the selective catalytic reduction (SCR) activity.Keywords:selective catalytic reduction;nitrogen oxides;cerium vanadate;iron vanadate;cerium-iron vanadate
研究领域:
环境科学
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催化化学
✓ 已验证
DOI
高影响因子
POLYHEDRON
·
2017
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IF 1.926
Fugen Yuan,Zhanghai Gu,Li Li,Lin Sha
The reaction of Ce(O t Bu) 2 (NO 3 ) 2 , prepared in situ from (NH 4 ) 2 Ce(NO 3 ) 6 and t BuONa in a 1:4 M ratio in THF, and N -phenyldiethanolamine (C 6 H 5 )N(CH 2 CH 2 OH) 2 in a 1:1 M ratio led to a brown solution, to which 1,10-phenanthroline (phen) was added. Yellow crystals of Ce(NO 3 ) 3 (phen) 2 and red crystals of Ce 13 O 8 [(OCH 2 CH 2 ) 2 N(C 6 H 5 )] 18 ( 1 ) were produced respectively at 40 °C. Complex 1 is a novel polynuclear cerium(IV)-diolate compound with an 18 N-phenylaminediethanolate shell and a 13-nuclear cerium(IV)-oxo core. It catalyzed the polymerization of ε -caprolactone (CL) to produce PCL in very narrow molecular weight distribution.
研究领域:
无机化学
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材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Kewei Jiang,Yawei Shao,Valeri Smolenski,Alena Novoselova,Qi Liu,Minghui Xu,Yongde Yan,Jing Yu,Milin Zhang,Jun Wang
The electrode reactions of the Ce 3+ /Ce couple in molten LiCl–KCl eutectic in the temperature range 723–823 K on solid Mo electrodes were investigated by electrochemical techniques . The mechanism of deposition of metallic cerium has been established. It was found that the cathode reaction is irreversible and proceeds in one stage. The apparent standard Gibbs energy of CeCl 3 formation from the elements was calculated. The values of enthalpy and entropy were equal: ΔH* = − 1000.2 kJ/mol, ΔS* = 166.0 J/mol·K. The conditions of high-purity cerium production have been studied. The chemical structure of cathode deposits as well as the surfaces of the crucible were investigated by XRD , ICP and SEM-EDS methods. It was established that the best results for purification of the cathode product from impurities were achieved in the range 40–60 mA/cm 2 using a two-stage electrolysis. The amounts of the main impurities in the final product were 0.005 wt% Al, 0.0021 wt% Fe, and 0.003 wt% Si. The total purity of metallic cerium after cleaning was increased up to 99.971 wt% if a vitreous carbon crucible was used.
研究领域:
冶金学
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电化学
✓ 已验证
DOI
高影响因子
MOLECULAR PHARMACEUTICS
·
2025
·
IF 4.5
Qian-ni Wu,Zi-ren Feng,Qin Tang,Jiu-ping Jin,Xue-hui Liu,Zhi-bin Mai,Sheng-nan Zhao,Yong-qi Lan,Kai-xin Chen,Jin-duan Lin,Peng-cheng Xu,Ji-jun Fu
Acute liver injury (ALI), often triggered by an acetaminophen (APAP) overdose, is characterized by severe oxidative stress, inflammation, and hepatocyte apoptosis. Current therapies, such as N-acetylcysteine (NAC), are limited by narrow treatment windows, highlighting the need for more effective antioxidant strategies. In this study, cerium oxide nanoparticles (CeO2 NPs, nanoceria) were synthesized and comprehensively characterized using the transmission electron microscopy (TEM), dynamic light scattering method (DLS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) to confirm their branched morphology, high crystallinity, and mixed Ce3+/Ce4+ valence states. Their enzyme-mimetic antioxidant activities were evaluated through superoxide, hydrogen peroxide, and hydroxyl radical scavenging assays. Nanoceria exhibited excellent cytocompatibility and effectively suppressed the generation of lipopolysaccharide (LPS)-induced reactive oxygen species (ROS) and lipid peroxidation and caspase-3-mediated apoptosis in macrophages. They also downregulated pro-inflammatory mediators (nitric oxide synthase (iNOS), TNF-α, IL-1β, and NLRP3) while enhancing anti-inflammatory markers (Arg1 and IL-10). In an APAP-induced ALI mouse model, nanoceria preferentially accumulated in the liver, alleviated oxidative stress and inflammation, and significantly reduced aspartate aminotransferase (AST) levels, showing hepatoprotective efficacy comparable to NAC. Nanoceria protect against APAP-induced ALI via synergistic antioxidative and anti-inflammatory mechanisms based on reversible Ce3+/Ce4+ redox cycling. These findings underscore nanoceria’s potential as a next-generation nanotherapeutic for oxidative stress-related liver diseases.
研究领域:
纳米医学
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毒理学
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肝病学
·
氧化应激
·
炎症
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Yi Yang,Jia Fang,Zhongwei Meng,Ping Pu,Qian Zhang,Chengcheng Yi,Suozhu Pan,Yalong Li
To solve the soot elimination and optimize catalyst diesel particulate filter (CDPF) regeneration strategies, a series of Mn-Ce catalysts with different Mn/(Mn+Ce) molar ratios are successfully synthetized by hydrothermal method and the complete catalytic oxidation of diesel engine soot are investigated. Compare to CeO 2 and MnO 2 , the catalytic promotion on soot combustion of Mn-Ce catalysts is more excellent by thermogravimetric experiments due to their better ability to activate oxygen species, which is consistent with results in characterization analysis. Among as-prepared catalysts, MC-0.40 has the best catalytic activity with the lowest starting temperature ( T s ), peak temperature ( T p ) and largest comprehensive combustion index ( S ) both in O 2 /N 2 and NO/O 2 /N 2 atmosphere. Influence factors on catalytic performance are studied. Weight ratios of soot/MC-0.40 catalyst are suitable at the range of 1:9–1:13, which makes soot combustion more easily. Ashes in the reaction process show adverse effects due to their ability to increase ignition point by inhibit heat and oxygen transfer. Mn-Ce catalysts are more sensitive and show better catalytic activity in NO atmosphere because of generations of abundant adsorbed species and NO adsorption/desorption. The three consecutive cycles of MC-0.40 catalyst are performed to study the catalytic stability, and thermogravimetric curves show that the potential reusability of MC-0.40 catalyst can be relatively accepted in soot combustion.
研究领域:
环境科学
·
催化材料科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 2
·143
·
IF 3.52
Chengxiong Wang,Dezhi Ren,Junchen Du,Qinggao Qin,Aimin Zhang,Li Chen,Hao Cui,Jialin Chen,Yunkun Zhao
Ceria-modified Pt/Al2O3catalyst has been commonly prepared by the impregnation of platinum on ceria-modified alumina and widely applied in the chemical industry and automotive industry. The in situ diffuse reflectance infrared Fourier transformed spectroscopy (DRIFTS), and thermogravimetric (TG) analysis techniques were employed to investigate the typical mechanisms of the bis(ethanolammonium)hexahydroxyplatinate(IV) and cerium nitrate decomposition catalyzed by Ptδ+species for the facile synthesis of CeO2-Pt/Al2O3catalyst. It was found that Pt4+-catalyzed decomposition of cerium nitrate leads to the higher dispersity of ceria and forming more active oxygen species, on the basis of X-ray diffraction (XRD) and H2temperature-programmed reduction (H2-TPR) results. The in situ activity measurements were also performed to investigate the reaction mechanisms and the specific activities for the catalytic CO, NO, C3H6and C3H8co-oxidation. The results indicate that undesirable N2O by-product is formed by the selective catalytic reduction (SCR) of NO by C3H6below 350 °C. The cerium addition effectively improves the activity of catalytic oxidation, but exhibits an increased N2O yield, due to the increased reducibility.Keywords:platinum;ceria;in situ characterization;catalytic oxidation
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2024
·
IF 24.4
Yanyan Zhang,Guangtong Hai,Zhuoshen Huang,Zhimeng Liu,Xiubing Huang,Ge Wang
Electrocatalytic oxidation of 5-hydroxymethylfurfural (HMFOR) is an effective route to produce value-added chemicals with low energy consumption. In this work, efficient electrocatalysts are prepared by varying the amount of Ce doping and CeO 2 modification on NiFe layered double hydroxide (NiFe–LDH) nanosheets supported on carbon cloth (CC). Through Ce doping and heterogeneous interface construction, the electronic structure and coordination chemistry of NiFe–LDH are greatly changed. Compared to CeO 2 modification and the synergistic effect of Ce-doping and CeO 2 modification, CC@NiFeCe(3%)-LDH with only Ce-doping show excellent charge transfer ability, higher HMF conversion (95.73%), 2,5-furandicarboxylic acid (FDCA) selectivity (93.31%), and Faraday efficiency (99.47%) at only 1.44 V RHE . Density-functional theory calculations and X-ray fine structure spectroscopy demonstrate that Ce doping, compared with CeO 2 modification and their synergistic effects, significantly facilitates the electron transport and optimizes intermediate adsorption by effectively lowering the activation energy for the transformation of 5-formyl-2-furancarboxylic acid (FFCA) and encourage the conversion of FFCA to FDCA. Overall, this work systemically investigates the HMFOR behaviors of CC@NiFe–LDH under Ce doping, CeO 2 modification, and their synergetic effect, which provides some guidance on the development of high-performance electrocatalysts for HMFOR performance.
研究领域:
材料科学
·
催化化学
·
能源化学
✓ 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）