CHEMOSPHERE
·
2024
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IF 8.1
Linxin Zheng,Ningchao Zheng,Zhizeng Pan,Guang Gao,Chao He,Xinran Mou,Xiangbiao Yin,Shunyan Ning,Mohammed F. Hamza,Yuezhou Wei
Efficient recovery of uranium from wastewater and seawater provides an important guarantee for the sustainable growth of nuclear energy. Herein, we skillfully use the alkali etching method to construct CeO 2 hollow spheres rich in Ce–OH groups for the removal and recovery of uranium from water matrixes. It is found that the CeO 2 exhibits fast adsorption kinetics (equilibrium time within 10 min) and moderate adsorption capacity (143.1 mg/g), and the removal efficiency of low concentration uranium (0.1 g/L and 1 g/L) reaches 100% within 1 min of adsorption. Moreover, the adsorption of uranium by CeO 2 is almost unaffected by common anions and cations in the environment, even if the concentration of anions is 1000 times that of uranium. More importantly, the CeO 2 can enrich uranium concentration in seawater by 167.9 times and the recovery rate reaches 83.9%. Mechanistic studies reveal that the adsorption of uranium by CeO 2 is mainly attributed to the rich Ce–OH groups on the surface of CeO 2 , resulting in the rapid adsorption of U(VI) and mainly forms a single-bridge model. The findings of this study provide a green and efficient path for the removal and recovery of uranium from wastewater and seawater.
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
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Haocui Zhang,Zhourong Xiao,Mei Yang,Jijun Zou,Guozhu Liu,Xiangwen Zhang
Ni/SBA-15 modified by highly dispersed cerium-oxide was prepared with the aid of sucrose for steam reforming of JP10 (C 10 H 16 ). Their characterization showed that addition of appropriate amount ceria led to the formation of highly dispersed CeO 2 and Ni, and the CeO 2 covered smaller nickel particles like strawberry seeds to form much more interface between them. Their catalytic activity exhibited higher stability over time on stream of 6.5 h with conversion higher than 95% and higher carbon resistance (mass loss less than 4.5% by TG), which may derive from good properties below: (1) much more interface enhanced cooperation effect and increased turnover frequency at the interface; (2) the stronger interaction between Ni and ceria to suppress sintering by formation of Ni-O-Ce solid solution; (3) the large amount of oxygen vacancies from the formation of Ni-O-Ce solid solution and highly dispersed CeO 2 to facilitate the water–gas–shift reaction and carbon removal.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 17
·3573
·
IF 4.967
Ruidan Liu,Xiaoyan Liu,Heng Yang,Handuo Jie,Tianyu Li,Kai Lyu,Surendra P. Shah
The lamellar structure of graphene oxide and the filling effect of nano-cerium oxide particles together provide a good barrier and stability to coating. In this paper, cerium oxide-graphene oxide (4:1) nanocomposite was prepared by the hydrothermal synthesis method. The effect of cerium oxide–graphene oxide (4:1) nanocomposite on the anticorrosion properties of epoxy coating in simulated acid rain solution was studied by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), Mott–Schottky curve, Tafel curve, and micromorphological characterization, in order to compare it with pure epoxy coating, graphene oxide epoxy coating, and cerium oxide epoxy coating. The obtained results showed that cerium oxide–graphene oxide (4:1) epoxy coating’s protection efficiency was as high as 98.62%. These results indicated that cerium oxide–graphene oxide modified anticorrosive coating had an excellent application prospect in an acid rain environment. Meanwhile, owing to the poor protection ability of epoxy resin and unstably hydrolysis product of CeO2to the acidic medium, the resistance of CeO2–GO (4:1)/EP coating to acidic corrosive medium was relatively poorer than that of neutral and saline-alkali corrosive medium.Keywords:CeO2;nanocomposite;electrochemistry;EIS;acid rain
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yalei Ding,Jiejie Wang,Shanshan Xu,Kun-Yi Andrew Lin,Shaoping Tong
In order to completely mineralization of contaminants, it is necessary to develop new methods which can effectively degrade final products of chemical oxidation. Acetic acid (HAc) has been considered one of the typical end products of chemical oxidation of pollutants and thus chosen as a representative target pollutant in the study. Nano-cerium oxide (CeO 2 ), an environment-friendly rare-earth material, was prepared to catalytic ozonation of HAc in acidic solutions. Experimental results show that the prepared CeO 2 could greatly enhance efficiency of H 2 O 2 /O 3 , and also have good stability and recyclability. The Raman spectra indicate that H 2 O 2 interacts with oxygen vacancies of CeO 2 to form peroxide-like species, which could effectively initiate the decomposition of ozone to produce hydroxyl radicals. A mechanism is proposed to explain the activity of peroxide-like species for the decomposition of ozone. The effects of different parameters such as initial pH value, catalyst dosage, and the concentration of H 2 O 2 are also investigated. The results indicate that the CeO 2 /H 2 O 2 /O 3 may provide a convenient and effective method for degrading refractory organic pollutants in acidic wastewaters.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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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
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Dengfeng Yan,Shengpeng Mo,Yuhai Sun,Quanming Ren,Zhentao Feng,Peirong Chen,Junliang Wu,Mingli Fu,Daiqi Ye
Herein, CeO 2 catalysts with nanotube , nanobelt, and wire-in-nanotube morphologies were successfully fabricated by a facile single spinneret electrospinning technique. And catalytic activity of these electrospun CeO 2 nanomaterials were evaluated by toluene catalytic combustion reaction. Among the three morphologies of CeO 2 catalysts, CeO 2 nanobelt (CeO 2 -NB) presented the best toluene catalytic combustion performance (T 90% = 230 °C) at WHSV = 60,000 mL g −1 h −1 , also exhibited the lowest activation energy (E a = 80.2 kJ/mol). Based on the characterization by TEM , XRD, BET, SEM, XPS, Raman spectroscopy , H 2 -TPR, and O 2 -TPD results, the high catalytic activity of CeO 2 -NB catalyst was attributed to its porous nanobelt morphology with larger specific surface area and the abundance of surface oxygen vacancies. Furthermore, the CeO 2 -NB catalysts presented an excellent durability by longtime on-stream test (as well as presence of 5% vol. water vapor), suggesting its great potential for practical air pollution control application.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Minghao Hu,Hengyi Chen,Baocang Liu,Xuan Xu,Bo Cao,Peng Jing,Jingjing Zhang,Rui Gao,Jun Zhang
In this study, we report a novel self-supported electrode consisting of ceria/molybdenum carbides composite microrods with adjustable crystalline phases and abundant heterostructures on carbon cloth (CeO 2 /Mo x C/CC). The optimized CeO 2 /α-MoC/β-Mo 2 C MRs/CC electrode exhibits very low overpotentials of 22 and 29 mV at 10 mA cm −2 for hydrogen evolution reaction (HER) in alkaline freshwater and seawater, outperforming most of the reported molybdenum carbide-based electrocatalysts. Meanwhile, it could maintain long-term stability for over 100 h at a large current density of 1000 mA·cm −2 . Theoretical study and experimental results reveal that the synergistic effects of α-MoC, β-Mo 2 C, and oxygen vacancy-rich CeO 2 can effectively promote the dissociation of water molecules, tailor the d‐band electronic structure of Mo x C with a thermoneutral hydrogen adsorption free energy , increase the numbers of active sites, and facilitate the vectorial electron transfer, thus achieving an enhanced HER performance. The CeO 2 /α-MoC/β-Mo 2 C MRs/CC electrode displays a potential large-scale application in hydrogen generation.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Lemeng Ding,Bingwei Zhong,Xiao Kong,Lingmei Wang,Chao Li,Qingyang Du,Conghua Liu,Wuzhu Sun
Elevated nitrate levels in natural water bodies significantly disrupt the global nitrogen cycle and pose a substantial environmental and human health risk. This study investigates the selective conversion of nitrate to ammonia via catalytic hydrogenation. This highly efficient and selective process offers a sustainable alternative to traditional ammonia production methods while simultaneously addressing nitrate pollution. Ruthenium (Ru) catalysts supported on ceria (CeO 2 ), titania (TiO 2 ), and tin dioxide (SnO 2 ) were synthesized using a simple impregnation method, incorporating oxygen vacancies and low Palladium (Pd) loadings (0.25–0.5 wt%) to enhance catalytic performance. Ru-Pd/CeO 2 exhibited superior activity and selectivity, maintaining near 100 % ammonia selectivity across various nitrate concentrations. At 75 °C, complete conversion of 2000 ppm nitrate to ammonia was achieved within 80 min using Ru-Pd/CeO 2 , and the yield of ammonia can reach up to 16440 mg•h −1 •g Ru -1 . Subsequent ammonia enrichment through evaporation yielded pure ammonia solutions up to 3.6 wt%. Characterization and theoretical calculations suggest that abundant oxygen vacancies on the CeO 2 surface and efficient hydrogen spillover from Pd nanoparticles synergistically contribute to the Ru-Pd/CeO 2 catalyst’s superior performance. The catalyst exhibited excellent stability and reusability, maintaining high activity and selectivity over four cycles. This research presents a promising strategy for addressing nitrate pollution in water bodies while offering a sustainable and environmentally friendly route for ammonia synthesis. The findings of this study lay the foundation for further advancing and potentially implementing catalytic hydrogenation technology for nitrate pollution remediation and ammonia synthesis.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·
IF 3.1
Peng Huan,Jiang Mengmeng,Ye Jinfeng,Wang Lei,Ding Shunmin,Cehn Chao
Oxygen vacancy in ceria is a crucial regulation factor for modifying materials. The reduced oxygen vacancy will undergo rapid recombination and deactivation due to the imbalance perturbation of active oxygen species, thereby restricting their larger-scale application. In this work, we proposed a strategy to stabilize oxygen vacancy in four black CeO x (Si) (0< x <2) by quartz sand doping reduction. The formation of a Ce-O v -Si (O v denoted as oxygen vacancy) interface, instrumental in constructing stable oxygen vacancies, is facilitated by rich hydroxyl groups. Characterizations of CeO x (Si) reveal that the heterogeneous hydrogen at the Ce-O-Si interface encourages the lattice distortion in ceria to obtain stable oxygen vacancies. Guided by the reusable feature, quartz sand doping reduction is a facile and feasible strategy to stabilize the oxygen vacancy of black CeO x for advanced materials on a large scale.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Weihao Fan,Huaiyuan Wang,Chijia Wang,Zhanjian Liu,Kaka Li,Yanji Zhu
CeO 2 was used as the only oxidant for aniline polymerization, and polyaniline (PANI) was grown on CeO 2 surface to form CeO 2 @PANI nanocomposites. SEM and TEM showed that the CeO 2 @PANI composites were nanorods in a core-shell structure. XPS indicated that CeO 2 -core was reduced by aniline into Ce 3+ , which was then captured by the PANI-shell. Then the passive ability of CeO 2 @PANI coating on steels was explored. EIS showed that the impedance modulus of the CeO 2 @PANI coating exceeded 10 8 Ω·cm 2 after accelerated immersion. The SVET and XPS confirmed that PANI polarized the anodic reaction, Ce 3+ suppressed the cathodic reaction, and PO 4 3− formed complex precipitation. Some high-valent metal oxides can directly oxidize the aniline polymerization to form MO@PANI hybrid particles. The cations obtained by the metal oxide reduction can be captured by PANI and participate in passivation together with dopants. This study provides a new kind of nanocomposite fillers that can effectively passivate steel substrates within epoxy coatings for long-time protection.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2020
·Vol. 13
·期 24
·5768
·
IF 3.057
Zhuo Wang,Zhu Chen,Jie Zheng,Shufeng Zuo
In this study, three kinds of CeO2were synthesized, and supported PdOx(x = 0,1) catalysts were prepared for benzene catalytic combustion. The samples were characterized by XRD, N2adsorption/desorption, HRTEM, XPS and H2-TPR. The results show that three kinds of CeO2with different structures can be formed by different preparation methods. This is mainly reflected in the differences in pore structure, particle size and crystal plane. CeO2-DC obtained from directly calcined Ce(NO3)3·6H2O had the largest pore volume and pore diameter and smallest particle size. CeO2-DC was mainly exposed to the (200) plane. Combined with the results of the ability test, it could be concluded that when Pd2+and Pd0exist at the same time, the activity increases with an increase in the proportion of Pd2+. Meanwhile, the structure of CeO2affects the formation of oxygen vacancies, thereby affecting the adsorption and degradation of benzene. This article reveals that the particle size, crystal planes, oxygen vacancies and proportion of Pd2+have a great impact on the catalytic combustion of benzene and allow a more comprehensive understanding of the structure–activity relationship, which can guide us to design high-efficiency catalysts targeted to obtain suitable CeO2-based catalysts for the catalytic combustion of benzene.Keywords:cerium oxide;benzene;catalytic combustion;particle size;crystal surface
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Ting Liang,Biao Wang,Zhenzhong Fan,Qingwang Liu
CeO2 was synthesized by the co-precipitation method on the Cu mesh substrate and modified the surface of CeO2@Cu mesh by stearic acid (SA). The superhydrophobic behavior was ascribed to the combination of hierarchical micro–nanostructure of CeO2 and the hydrophobic alkyl groups from SA. The SA-CeO2@Cu mesh had antiacid and base stability and excellent durability as well as high separation efficiency. The separation efficiency can be up to 98.0% after separating 30 times.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）