APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
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IF 9.446
Qixing Zhou,Shuanglong Ma,Sihui Zhan
Ordered mesoporous Ag/CeO 2 nanocomposites were prepared by combining nanocasting with photo-assisted reduction. The heterogeneous photoreactivity of the prepared samples was tested for inactivating Escherichia coli ( E. coli ). These mesoporous Ag/CeO 2 nanocomposites exhibited superior photocatalytic disinfection efficiency than mesoporous CeO 2 and bulk CeO 2 , respectively. Doping Ag species could extend the absorption range to visible light area and enhance the concentration of Ce 3+ ions and oxygen vacancies, which had significant influence on the surface properties of CeO 2 . Moreover, it is the first time to verify that created midgap states through doping Ag can significantly lower the threshold of incident photon energy and broaden the adsorption spectrum demonstrated by experimental studies and density functional theory (DFT) calculations. The enhanced disinfection mechanism was attributed to the fact that the novel mesoporous structure can promote the mass transfer process and the interfacial interaction between Ag species and CeO 2 and lead to reduced recombination of free charges, rapid separation and transportation of photogenerated electrons-holes. This work provides a new method to develop novel mesoporous plasmonic photocatlysts for disinfection using solar radiation.
研究领域:
环境科学
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微生物学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2023
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IF 0.7
Kang-Qiang Liu,Chuan-Bao Wu,Si-Yu Zhou
ABSRACTFor achieving a uniform and stable suspension of CeO2 nanoparticles in aqueous medium, Al3+ was doped into the lattice of CeO2 by hydrothermal treatment. Although the doping will increase the probability of adhesion of primary particles with the size of 7 nm, it can effectively prevent the agglomeration between CeO2 particles, greatly improve the dispersion uniformity and suspension stability of particles, greatly narrow the particle size distribution of secondary particles, and make the degree of particle agglomeration controllable. Meantime, the UV absorption property of the product was improved and the absorption peak was red shifted after Al3+ doping.
研究领域:
材料科学
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纳米技术
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
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IF 6.2
Qianji Li,Zejia Hao,Chenchen Zhang,Shanhong Ni,Ping Jiang,Pengfei Fan,Lei Li
In this article, a dual-signal sensor for the fluorescence and colorimetric detection of glyphosate (Gly) is developed based on DNAzyme-mediated click chemistry and DNAzyme-regulated CeO2 peroxidase-like activity. DNAzyme can bind to Cu+, triggering a click chemistry reaction between 3-Azido-7-hydroxycoumarin (AHC) and 3-ethyn-1-ol (BOL), thus generating a strong fluorescence signal at 475 nm. Due to the strong coordination between Gly and Cu2+, the amount of reduced Cu+ decreases, resulting in a weakening of the fluorescence. In addition, Gly can inhibit the catalytic site of CeO2 enzyme activity, while DNAzyme, which does not participate in the click chemistry reaction, can be adsorbed by CeO2, further inhibiting the enzyme activity and reducing the oxidation color change of 3,3′,5,5′-tetramethylbenzidine (TMB). The fluorescence detection limit of this dual-mode sensing platform is 0.15 μg/mL, and the colorimetric detection limit is 0.19 μg/mL. This method has been successfully applied to the detection of Gly in tap water and soybeans, which has a promising application in pesticide residue detection.
研究领域:
分析化学
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生物传感器
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2023
·Vol. 15
·期 7
·e202300194
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IF 4.5
Tao Li,Mengling Dong,Jiacheng Xu,Tiantian Zhang,Yan Sun,Ning Li,Zuliang Wu,Jing Li,Erhao Gao,Jiali Zhu,Shuiliang Yao,Yong Huang
Graphical CeO 2 /γ-Al 2 O 3 , Pd/CeO 2 , and Pd/CeO 2 /γ-Al 2 O 3 were used for catalyzing low-concentration CH 4 oxidation . γ-Al 2 O 3 can efficiently promote CH 4 oxidation on Pd/CeO 2 and the formation of bicarbonate that is easily gasified to CO 2 . CeO 2 /γ-Al 2 O 3 , Pd/CeO 2 , and Pd/CeO 2 /γ-Al 2 O 3 were used for catalyzing low-concentration CH 4 oxidation. It was found that nano-sized Pd could obviously promote CH 4 oxidation on CeO 2 /γ-Al 2 O 3 . The interaction between Pd and CeO 2 on γ-Al 2 O 3 resulted in higher ratios of Ce 3+ /(Ce 3+ +Ce 4+ ), Pd 2+ /(Pd 2+ +Pd δ+ ), and O ads /(O ads +O latt ), those benefited the formation of more oxygen vacancies and surface reactive oxygen species for CH 4 oxidation. γ-Al 2 O 3 not only supplied a high surface area and enhanced Pd/CeO 2 dispersion on γ-Al 2 O 3 , but also simulated the formation of bicarbonate, where bicarbonate is easier to gasify to CO 2 than bidentate carbonate that formed on Pd/CeO 2 . Operando diffuse reflectance infrared Fourier transform spectroscopy-mass spectrometer analysis results showed that CH 4 oxidation could occur at a temperature as low as 180 °C due to the reaction with surface reactive OH, this reaction was also accompanied by the formation of bicarbonate. The mechanism of CH 4 oxidation promoted by bicarbonate formation on γ-Al 2 O 3 was proposed.
研究领域:
催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Xia Li,Weiqiang Fan,Yajie Bai,Ying Liu,Fengfeng Wang,Hongye Bai,Weidong Shi
Photoelectrochemical nitrate (NO 3 – ) reduction reaction (PEC NRR) is a promising technology to solve both environmental pollution and traditional energy crisis. However, the fabrication of efficient catalyst with controllable active sites for high selectivity is still challenging. In this work, copper phthalocyanine (C 32 H 16 CuN 8 )/cerium dioxide (CuPc/CeO 2 ) heterostructure has been designed as a model to understand the role of Ce 3+ /Ce 4+ pairs on the formation of oxygen vacancies (OVs), which helps for identifying the key factors to adjust the chemical adsorption and activation of NO 3 – in PEC NRR system. Furthermore, the unique organic–inorganic hybrid matrix significantly strengthens the relationship of solar harvest–carriers’ separation–NO 3 – reduction. CuPc/CeO 2 heterostructure exhibits a high NH 3 yield of 1.16 μmol h −1 cm −2 and Faradic efficiency of 33% (-0.6 V vs.), and the desirable PEC NRR could be well retained for 5 cycles. Therefore, the construction of CuPc/CeO 2 successfully optimizes the thermodynamic and kinetic factors in PEC NRR system, providing a new insight for organic–inorganic hybridization and NH 3 green production.
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
Journal of Energy Chemistry
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2022
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IF 13.599
Xiaochuan Chen,Libo Li,Yuhang Shan,Da Zhou,Wenjun Cui,Yangmingyue Zhao
Limited by the shuttle effect, the application of lithium-sulfur batteries is not impressive. As an organ layered two-dimensional (2D) material, MXene has a great electrical conductivity and high specific surface area. Meanwhile, the introduction of metal oxides can restrain the shuttle effect. Hence, this paper prepared CeO 2 /MXene as a cathode material of Li-S batteries. Ce and Ti can chemically adsorb S, and the interlayer structure of MXene can limit S while the interlayer space can alleviate volume expansion. The discharge capacity at 0.5 C is as high as 1051.1 mAh g −1 , and 921.9 mAh g −1 after 200 cycles. The average coulombic efficiency is 97.75%. The organized MXene with CeO 2 like notes in accordions are new efficient materials for lithium-sulfur batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Xiang Liu,Tian C. Zhang,Huaqiang He,Like Ouyang,Shaojun Yuan
Corrosion is one of the most challenging issues for the large-scale application of magnesium alloys . Fabricating a superhydrophobic surface with a low-cost, easy-to-handle method is meaningful for anti-corrosion protection of Mg alloys. In this study, a stearic acid/CeO 2 bilayer coating was prepared on AZ31B Mg by a simple electrodeposition method combined with immersion in stearic acid solution. The growth traits of the coating with different electrodeposition current densities and time were evaluated, which demonstrated that 60 min combined with 0.65 mA/cm 2 is the optimal electrodeposition condition. Besides, the wettability , anti-corrosion ability, durability, chemical stability and self-cleaning properties of the coating were comprehensively investigated. The results showed that the as-prepared coating exhibited a good superhydrophobic and self-cleaning property with CA>158° and SA<2°. Moreover, the coating demonstrated an improved anti-corrosion performance in 3.5 wt% NaCl solution and was quite stable in the atmosphere and in contact with pH droplets of 1–13.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
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IF 4.4
Diwei Deng,Ping Ma,Xianliang Li,Xiaoyu Chen,Yan Xu
Metal oxide heterostructures have been demonstrated excellent candidates acting as novel gas sensors with outstanding sensitivity and selectivity . In this work, a hierarchical NiGa 2 O 4 @C@CeO 2 heterostructure with corn-like NiGa 2 O 4 microcrystals covered by a thin carbon layer and then anchored with numerous amounts of external CeO 2 nanoparticles was prepared through the combination of hydrothermal and a subsequent calcination method. The NiGa 2 O 4 @C@CeO 2 composite demonstrates an excellent selective triethylamine (TEA) detection performance with a response of 11.1 towards 20 ppm TEA and a fast response/recovery time of 81 s/38 s. It also shows terrific selectivity for TEA when mixed with else interfering substances, along with prolonged reusability for at least 15 days. The enhanced TEA sensing performance can be ascribed to the significant improvement of conductivity and effective carrier transfer at the interface. This work provides a feasible method to fabricate metal oxide sensors with improved gas sensing performance.
研究领域:
材料科学
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化学传感器
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
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IF 8.097
Junfang Ding,Liping Li,Huixia Li,Shaoqing Chen,Shaofan Fang,Tao Feng,Guangshe Li
Interfacial regulation offers a promising route to rationally and effectively design advanced materials for CO preferential oxidation. Herein, we initiated an interfacial regulation of CeO2–CuOx–RGO composites by adjusting the addition sequence of the components during the support formation. The presence of RGO along with the sequence tuning of the components is confirmed to survey the changes of the oxidation state of copper species, the content and distribution of the Cu+ site, and the synergistic interactions between Cu–Ce mixed oxides and reduced graphene oxide (RGO) over the catalysts. These catalysts were systematically characterized by inductively coupled plasma, X-ray diffraction, transmission electron microscopy/high-resolution transmission electron microscopy, hydrogen temperature-programmed reduction, X-ray photoelectron spectra, thermal gravimetric analysis, Raman spectra, and in situ diffuse reflectance infrared Fourier transform spectroscopy measurements. The results show that RGO is favorable for the generation of Cu+ and the dispersion of copper–cerium species in the as-prepared catalysts. Furthermore, by multi-interfacial regulation of the CeO2–CuOx–RGO composites, the catalyst CeO2/CuOx–RGO exhibits a strikingly high catalytic oxidation activity at a low temperature coupled with a broader operation temperature window (i.e., CO conversion >99.0%, 140–220 °C) in the CO-selective oxidation reaction, which has been attributed to the high content of the active species Cu+ enriched on the surface, the highly dispersed copper oxide clusters subjected to a strong interaction with ceria, and the synergistic interactions between Cu–Ce mixed oxides and RGO.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Junhui Yi,Huimei Mo,Bangliang Zhang,Jiaxing Song,Dongqin Liu,Guanjie Zhuo
CeO 2 /Bi 2 MoO 6 heterostructured microspheres were successfully synthesized through precipitation and hydrothermal method. The as-obtained samples were well characterized by XRD, SEM, TEM, UV–Vis DRS and XPS. The photocatalytic activity was evaluated by degrading acid orange II (AO-II) under visible light irradiation. The test results show that CeO 2 /Bi 2 MoO 6 heterostructured microspheres have broad absorption in the visible region and have more superior catalytic activities than pure Bi 2 MoO 6 , which is attributed to the synergistic effect of the suitable band gap matching between CeO 2 and Bi 2 MoO 6 . Moreover, 0.1CeO 2 /Bi 2 MoO 6 composite has the highest activity. Radical scavenger experiments proves that the superoxide radical anions ( O 2 − ) and photogenerated holes (h + ) are dominating active species. The recycling experiment confirms that CeO 2 /Bi 2 MoO 6 heterostructure keep high stabilization during the photocatalytic reaction. On this basis, a photogenerated charge carriers transfer and photocatalytic progress on the CeO 2 /Bi 2 MoO 6 heterostructure has been discussed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2023
·
IF 3.9
Cheng Zhang,Yi Zheng,Jianfeng Li,Hongzhang Cao,Yanhui Xu,Weisheng Liu,Zhengping Dong
Selective hydrogenation of alkynol compounds to produce high value-added enols is an important reaction in the fine chemical industry. The construction of selective hydrogenation catalysts for alkynols is challenging because the alkynyl group is prone to over hydrogenation and the selectivity in the hydrogenation is always low. Herein, a simple sacrificial template strategy was designed to prepare mesoporous CeO2, on which ultrafine and highly-dispersed bimetallic PdCu nanoparticles were anchored, obtaining the PdCu@CeO2 catalyst. Introducing non-precious metallic Cu can improve the selectivity of precious metal Pd catalysts for the selective hydrogenation of alkynols through electronic and geometric modulation. The obtained PdCu@CeO2 catalyst showed high selectivity (99%) and good recyclability for the selective hydrogenation of the probe compound propynol ethoxylate under mild conditions. The PdCu@CeO2 catalyst also exhibited excellent performance in the catalytic selective hydrogenation of various substituted alkynols. Therefore, this research work provides a feasible strategy for the effective regulation of catalytic performance, which has potential application for the efficient catalytic selective hydrogenation of alkynols in the fine chemical industry.
研究领域:
催化化学
·
材料科学
·
精细化工
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2024
·
IF 3.8
Pengchao Ren,Zhenzhou Zhang,Tingting Hu,Zhihui Fan,Shanshan Dang,Sifan Cheng,Weifeng Tu,Yi-Fan Han
Graphical The apparent rate coefficients for CH 3 OH synthesis from CO hydrogenation are a single-valued function of the CO 2 -to-CO ratio in the contacting gas phase, because this ratio determines the extent of surface oxidation of Ce 2 O 3 to CeO 2 , the relative abundance of surface Ce 3+ , and in turn the density of Cu 0 -Ce 3+ sites pair on the working Cu/CeO 2 catalyst. This study investigated the dynamic structure of a working Cu/CeO 2 catalyst and its catalytic consequences for CH 3 OH synthesis via CO hydrogenation by kinetics, high-precise chemical titration, and a series of in situ X-ray spectroscopies. We have revealed that the apparent rate coefficients for CH 3 OH synthesis from CO hydrogenation are a single-valued function of the CO 2 -to-CO ratio in the contacting gas phase. This ratio determines the extent of surface oxidation of Ce 2 O 3 to CeO 2 , the relative abundance of surface Ce 3+ and Ce 4+ sites, and in turn, the density of Cu 0 -Ce 3+ sites pair on the working Cu/CeO 2 catalyst, although the chemical state of Cu and elemental distribution of both Cu and Ce were insensitive to the ratio. The reactivity of CH 3 OH formation and the Cu 0 -Ce 3+ sites decrease monotonously with an increase in the CO 2 -to-CO ratio. The direct connection of the reactivity and the oxidant-to-reductant ratio appears to be general for heterogeneous catalysis, for which the oxidant oxidizes metal atoms. In contrast, the reductant scavenges surface oxygen atoms, thus dictating the density of surface sites and their thermodynamic activities.
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
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