CHEMOSPHERE
·
2022
·
IF 8.943
Nengwei Ma,Yifan Ru,Mili Weng,Lu Chen,Wenqing Chen,Qizhou Dai
In this study, the catalytic materials of MnO x /γ-Al 2 O 3 , CeO 2 /γ-Al 2 O 3 , and Mn x Ce 1-x O 2 /γ-Al 2 O 3 for catalytic ozonation were synthesized. The catalysts were used in heterogeneous catalytic ozonation of the wastewater containing ntrofurazone (NFZ). The effects of the catalytic ozonation operational factors were systematically evaluated in terms of ozone dosing, catalyst dosing, initial NFZ concentration, and pH. The results showed that the catalytic activity of the Mn x Ce 1-x O 2 /γ-Al 2 O 3 was higher than that of the MnO x /γ-Al 2 O 3 and CeO 2 /γ-Al 2 O 3 . The kinetics analysis revealed that bimetallic loading has a synergistic effect and the mechanism of this effect was investigated in the catalytic ozonation system. The catalysts were characterized by FESEM, EDS, XRD, XPS, IR , and BET. The characteristics of the catalysts revealed that Mn could alter the oxide species on the metal surface and interfere with the formation of CeO 2 crystals, which led to smaller grains, enhanced adsorption oxygen, and greater specific surface area. The Mn x Ce 1-x O 2 /γ-Al 2 O 3 crystals could form a solid solution, which helps higher catalytic activity . This study adds to the understanding of the synergistic mechanism of the loaded Ce–Mn oxide catalysts in the heterogeneous catalytic ozonation system and provides a feasible method for degrading pharmaceutical wastewater.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Miao Hu,Aihua Yan,Xinyang Wang,Fei Huang,Qiaopeng Cui,Fan Li,Ji Huang
Ce-doped bismuth oxybromide (BiOBr) nanoplates were successfully synthesized by a facile hydrothermal method. The phase, composition, chemical state, microstructures, spectrum response, band gap, electron transfer and photocatalytic activity were analyzed in detail by a series of advanced tools. The results indicated that Ce 3+ ions were successfully incorporated into the crystal lattice of BiOBr. With the increase of Ce-doped amounts, the morphology gradually changed from nanowalls to nanoplates. Moreover, introducing Ce 3+ ions into BiOBr crystal not only slightly blue-shifed the adsorption edge, but also slightly widened the band gap. Compared to pure BiOBr, Ce-doped samples exhibited enhanced photocatalytic activity towards Rhodamine B (RhB) degradation under visible-light irradiation. The enhanced performance may result from higher specific surface area, faster charge transfer and lower carrier recombination. This works further reveal the mechanism of enhanced photocatalytic activity about rare-earth doped photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Chaoqun Bian,Xiaohui Luo,Xiao Chen,Rongrong Liu,Jingqiu Li,Gaoyuan Zhu,Hao Xu,Shichao Han,Jie Zhu,Longfeng Zhu
Cu-SSZ-39 zeolite with 8-membered rings is regarded as a very promising catalyst in the NH3-SCR reaction, but its hydrothermal stability still remains to be improved. One of the solutions to promote hydrothermal stability is the insertion of rare earth elements in the product. Nevertheless, normal ion exchange of rare earth elements limits their contents in the zeolite product due to their large hydrated ionic radius and alkaline environment under hydrothermal conditions. Herein, we for the first time present a new method for the one-pot synthesis of Ce-SSZ-39 zeolite under solvent-free conditions. The key to success is the use of Ce-FAU zeolite as a precursor. The obtained product shows good crystallinity, sheet-like morphology, large BET surface area, and 4-coordinated Al species. Detailed investigations illustrate that Ce species in the Cu/Ce-SSZ-39 zeolite micropore can prevent the dealumination and thus formation of CuAlOx species during hydrothermal aging at 850 °C for 16 h, giving the excellent hydrothermal stability and thus showing the excellent catalytic performance in the NH3-SCR reaction. One-pot synthesis of Ce-SSZ-39 zeolite with excellent catalytic performance might open a new door for developing very efficient selective catalytic reduction (SCR) catalysts in near future.
研究领域:
催化材料
·
环境化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2024
·
IF 5
Deliang Zeng,Tianyong Mao,Ziyi Zhang,Jing Dai,Junpeng Ouyang,Zhipeng Xie
We report the performance of an all-rare earth redox flow battery with Eu 2+ /Eu 3+ as anolyte and Ce 3+ /Ce 4+ as catholyte for the first time, which can be used for large-scale energy storage application. The cell reaction of Eu/Ce flow battery gives a standard voltage of 1.90 V, which is about 1.5 times that of the all-vanadium flow battery (1.26 V). Large standard voltage is conducive to the improvement of battery energy density and power density. The Eu 2+ /Eu 3+ electrode reaction in a NaCl solution on platinum electrode was investigated detailedly using cyclic voltammetry, linear sweep voltammetry, tafel plot and chronoamperometry. Unlike zinc-cerium flow battery, the active species of Eu/Ce flow battery are always present in the electrolyte, and no liquid-solid phase transition occurs. Thus, Eu/Ce flow battery is free of the problems associated with dendrite growth and theoretically have a longer cycle lifetime. The negative electrolyte is very sensitive to oxygen and can directly cause battery failure if exposed to air. The average energy efficiency of Eu/Ce flow battery exposed to air is only 22.0 %. However, the average energy efficiency of Eu/Ce flow battery stripped of oxygen reaches 82.7 % at 25 mA/cm 2 . Preliminary experimental studies have shown that Eu/Ce flow batteries are a promising method for large-scale energy storage.
研究领域:
能源存储技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xuan Wang,Zhenkuang Lei,Chunlin Zheng,Xueheng Zhuang,Qikui Man,Guoguo Tan
Semiconductor metal oxides are widely used in the field of wave absorption because of their easily tunable dielectric properties . Doping or modulating the morphology has been demonstrated to be an effective method to improve the microwave (MW) absorbing performance of semiconductor metal oxides. In this study, Ce-doped SnO 2 was prepared by a simple and effective coprecipitation method. Single-crystal SnO 2 nanorods were generated during the doping process and the size of the nanorods could be controlled by modifying the concentration of Ce. The presence of nanorods greatly enhances the MW absorbing performance: when the doping molar ratio is 3%, the minimum reflection loss of the absorber is −77.91 dB at a frequency of 13.79 GHz with a thickness of 1.6 mm and the maximum effective absorbing bandwidth is 4.47 GHz at a thickness of 1.5 mm. Excellent MW absorbing performance of Ce-doped SnO 2 is attributed to its excellent impedance matching and interfacial polarization.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
You Mengyun,Wu Shufeng,Feng Xiaotong,Zhao Yong,Wang Yubin,Zhang Zhang
The enhancement effect of Ce modification on V 2 O 5 -WO 3 /TiO 2 catalysts at low temperatures was investigated for the selective catalytic reduction (SCR) of NO x with NH 3 (NH 3 -SCR). By adding 9% CeO 2 to 0.5%V 2 O 5 -3%WO 3 /TiO 2 catalyst, the low-temperature denitrification performance of Ce 9 V 0.5 W 3 Ti catalyst after Ce modification was significantly improved, achieving a NO conversion above 90% within a broad temperature range of 200–350℃, with catalytic activity comparable to that of 3% V 2 O 5 -3% WO 3 /TiO 2 . The catalysts were characterized by XPS, H 2 -TPR, NH 3 , and NO-TPD. The results indicated that the Ce additive could enhance the adsorption of NO x on Ce 9 V 0.5 W 3 Ti catalyst due to the synergetic interaction among the Ce and V, W species. The interaction between V and Ce also promoted the formation of V 5+ and Ce 3+ on the surface of the catalyst, which was conducive to enhancing the adsorption and oxidation capacity of the catalyst for NO. Additionally, the introduction of Ce led to a substantial deposition of nitrate species on the surface of the catalyst, especially the increase of nitrite species, which was beneficial to the NH 3 -SCR reaction process, resulting in a significant enhancement of the catalyst’s low-temperature catalytic activity.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Bingxin Xie,Lei Lei,Jinghua Xu,Shiqing Xu
An pH-sensitive citric acid coated Ce/Tb:KGd 2 F 7 nanocrystals with a broad detection range from 3 to 10 is established. Under the 254 nm excitation, the Tb 3+ emission intensity originated from Ce 3+ → Gd 3+ →Tb 3+ decreases gradually with the increase of pH, while its intensity almost keeps unchanged in pH 3 to 6 and increases in pH 6 to 10 under the 311 nm excitation, which activates the ratiometric pH sensing with high sensitivity.
研究领域:
材料科学
·
纳米技术
·
传感器
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Lei Zhang,Tian Ai,Nan Zhang
Minocycline (MNC), as a second-generation semi-synthetic derivative of tetracycline, poses a potential carcinogenic threat to organisms in water, therefore high efficient removal of MNC is becoming a crucial key for water quality safety. This study has been successfully synthesized Ag/Ce bimetallic–doped MOF materials with diverse morphological characteristics by using microwave digestion and solvothermal methods, and it was demonstrated a significant adsorption potential in MNC from aqueous solutions. The characterization results were revealed that Ce exhibits oxygen vacancy enrichment as the central metal in MOFs, while Ag was distributed on carbon framework in the form of Ag 0 NPs, both of morphological features were provided more active sites for adsorption. The Ag/Ce–MOFs was achieved 98.26 % exceptional MNC adsorption efficiency at pH 9, which was followed a multilayer exothermic chemisorption mechanism. The results were shown that the maximum adsorption capacity of Ag/Ce-MOFs was 476.2 mg/g in Langmuir model, which was much more substantially surpassed than Ce–MOFs. In addition, the adsorption process was primarily mediated through hydrogen bonding, ligand interactions and amidation reactions. Furthermore, the Ag/Ce–MOFs exhibited the excellent regeneration performance and broad applicability, which was shown remarkable adsorption potential in removing various other pharmaceutical contaminants in water. In summarization, the synthesized Ag/Ce–MOFs by microwave digestion and solvothermal technology, were demonstrated the board promising prospects in efficient MNC removal in water treatment applications.
研究领域:
环境科学
·
材料科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Jing Zhang,Xiaojian Xu,Lu Chen
This work constructed an ultrasensitive electrochemical bisphenol A (BPA) sensor using hierarchical Ce-metal-organic framework (Ce-MOF) modified with cetyltrimethylammonium bromide (CTAB) as a sensing platform. Ce-MOF had been successfully prepared and conveniently modified with a cationic surfactant (CTAB) via the electrostatic interaction. Ce-MOF and CTAB/Ce-MOF were characterized by scanning electron microscopy, X-ray diffraction, infrared spectrum, thermogravimetric analysis and zeta potentials analysis. CTAB/Ce-MOF suspension was dropped onto glassy carbon electrode (GCE) surface to fabricate CTAB/Ce-MOF/GCE. Combined with preconcentration of BPA of the long alkane chain in CTAB via hydrophobic interaction and electrocatalytic activity of Ce-MOF, the dual amplification made CTAB/Ce-MOF/GCE exhibit high electrochemical response toward the oxidation of BPA, and an electrochemical BPA sensor was constructed based on CTAB/Ce-MOF/GCE by differential pulse voltammetry. The designed BPA sensor had a wide linear range from 0.005 to 50 μmol L −1 and a low detection limit of 2.0 nmol L −1 (S/N = 3). The proposed sensor had excellent reproducibility, stability and anti-interference, and was successfully employed for BPA detection in real samples. This convenient and sensitive sensor proved to be a promising and reliable tool for detecting BPA in food and environmental pollution.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 7
·1799-1812
·
IF 5.934
Xiaosong Hu,Chaoyue Zhao,Qingxin Guan,Xin Hu,Wei Li,Jun Chen
The chemical transformation of CO2 not only mitigates CO2 released into the atmosphere but also produces fuels and chemicals with important additional value. The activation of stable CO2 molecules is the key difficulty for the efficient conversion of CO2. Herein, we designed a ternary catalyst containing Cu, ZnO, and CeOx and dispersed them in SBA-15 using incipient wetness impregnation. Interestingly, the catalytic performances were improved greatly when the related active components were dispersed inside and outside the pore channels of SBA-15 using the incipient wetness impregnation method. Methanol and CO were controllably produced on the interface of Cu and metal oxides (ZnO and CeOx) due to the synergistic effects between the three active components. The metal oxides play a more important role in CO2 conversion as well as the product selectivity compared to Cu. CeO2 is more efficient than ZnO in promoting the dispersion of Cu nanoparticles and methanol generation. The suitable pore channels of SBA-15 promote the mass transfer and heat transfer while the high specific surface area is favorable to the dispersion of active components, which will facilitate the production of methanol and CO. After continuous hydrogenation evaluation for 100 h, the catalytic performance of the catalyst was still very stable. This work provides a viable strategy to prepare a supported catalyst with highly dispersed active sites, and the catalyst exhibits an efficient catalytic effect on producing methanol and CO.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 13
·D638
·
IF 3.12
Pengfei Xu,Xiaohong He,Junwei Mao,Yongming Tang
In this paper, Ti/SnO2-Sb/Ce-PbO2 anode is electrodeposited from MSA bath, and the effect of Ce3+ concentration in bath on the phase composition and morphology of lead dioxide electrode is elucidated. It is found that with the addition of 2 mM Ce3+ ion to the bath the Ce-PbO2 anode exhibits highest stability in 0.5 M H2SO4, and cerium exists as Ce (IV) in the PbO2 film. The electrocatalytic activity of lead dioxide anode for phenol removal is slightly enhanced by the inclusion of Ce. The significant improvement in electrocatalytic activity can be achieved by the addition of small amount of Bi3+ ion to the bath containing Ce3+ ion. In this study, electrocatalytic activities of various anodes follow the order: Ce,Bi-PbO2 > Ce-PbO2 > undoped PbO2 > Bi-PbO2.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiaoqiang Wang,Yue Liu,Zhongbiao Wu
In this paper, the Cu-Ce based catalyst using NbOPO 4 (Nb-P) as support was firstly employed for selective catalytic reduction (SCR) of NO by NH 3 . The experimental results had illustrated that such catalyst exhibited well SCR activity and N 2 selectivity within a wide temperature range of 200–450 °C. These superior performances could be mainly attributed to its improved textural properties and strong acidity derived from NbOPO 4 support. More importantly, the sulfur tolerance of the NbOPO 4 supported Cu-Ce sample was found greatly improved compared to TiO 2 and Ti-Nb supported samples, where above 80% SCR activity of Cu-Ce/Nb-P sample was obtained at 250 °C after 10 h reaction running in the presence of 100 ppm SO 2 . This fact was the result of the enhanced acidity and the strong interactions between Cu-Ce oxides and NbOPO 4 support, which could prevent the surface oxygen species from sulfation by SO 2 . As such, these oxygen species strongly associated with NbOPO 4 support still could activate adsorbed NH 3 to fulfill the SCR reaction cycle, leading to its better sulfur resistance. The work would provide some enlightenments to the development of NH 3 -SCR catalysts with high sulfur resistance at medium-high temperature.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
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