Journal of Materials Chemistry A
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2026
·
IF 9.2
Yunqi Zhang,Tianyu Zhang,Yifei Ye,Xinmeng Xu,Wenjuan Xiang,Xiubing Huang,Ge Wang
The development of catalytic activity for non-noble metals at low temperature features significant value for green chemical production with high economic interest. This work has successfully customized a series of ligand-functionalized and hierarchically porous Ce-UiO-66-X (HP-U(Ce)-X, -X= -NH2, -H, -NO2, -Br) as supports through the soft template methods, achieving the organic combination of bifunctional structures, providing abundant mesoporous channels for high exposure of guest Ni sites and efficient mass transfer of reaction substrates. The presence of electron-withdrawing/donating groups also facilitates electronic structure modification of Ni species. Therefore, with the selection of optimal -Br and synergistic improvement of mesoporous structures by formic acid (FA) and nitric acid (HNO3), Ni loaded on HP-U(Ce)-Br-6-4 obtains the lowest electron density and outstanding accessibility, reaching 100% conversion of dicyclopentadiene (DCPD) and ~100% selectivity for tetrahydrodicyclopentadiene (THDCPD) in only 30 min at 70 ℃ (while selectivity up to 95% at 60 ℃). This study provides new insight and guidance for performance modulation of non-noble metal based catalysts and rational integration of multifunctional structures in porous materials.
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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Jiejun Ren,Andries Meijerink,Xiaopeng Zhou,Jiapeng Wu,Gangyi Zhang,Yuhua Wang
All-inorganic perovskite quantum dots (PQDs), which possess outstanding photophysical properties, are regarded as promising materials for optoelectronic applications. However, the poor light conversion efficiency and severe stability problem hinder their widespread applications. In this work, a novel encapsulation strategy is developed through the in situ growth of CsPbX3 PQDs in presynthesized mesoporous cerium-based metal organic frameworks (Ce-MOFs) and further silane hydrolysis–encapsulation, generating stable CsPbX3@Ce-MOF@SiO2 composites with greatly enhanced light conversion efficiency. Moreover, the simulation results suggest that the pore boundary of Ce-MOFs has a strong waveguide effect on the incident PQD light, constraining PQD light inside the bodies of Ce-MOFs and suppressing reabsorption losses, thus increasing the overall light conversion efficiency of PQDs. Meanwhile, the Ce-MOF@SiO2 protective shell effectively improves the stability by blocking internally embedded PQDs from the harmful external environment. Further, the obtained white-light-emitting diode shows an ultrahigh luminous efficiency of 87.8 lm/W, which demonstrates their great potential in optoelectronic applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Lan Ding,Fenghua Bai,Burenbayaer Borjigin,Yuning Li,Huiqin Li,Xiaojing Wang
Solar-energy-driven CO 2 conversion into valuable chemical fuels holds great renewable potential. However, most photocatalysts' weak CO 2 adsorption limits more artificial photosynthesis for further utilization. Herein, we present an in situ assembling approach to produce stable Cs 2 AgBiBr 6 /Ce-UiO-66-H composite, in which a tight contact interface between the two participated components was constructed. Benefiting from the photocatalytic properties and high adsorption capacity for CO 2 , the optimized 20Cs 2 AgBiBr 6 /Ce-UiO-66-H adsorption-photocatalyst exhibits outstanding performance for reductive CO 2 deoxygenation with considerable CO generation rate (309.01 μmol g −1 h −1 ) under simulated solar light irradiation with 300 W Xe lamp, which is about 2.1 and 2.7 times than that of pure Cs 2 AgBiBr 6 and Ce-UiO-66-H, respectively. The excellent catalytic conversion of CO 2 is ascribed to the effective solar harvest and quickly photo-excited carriers’ separation in such assembled architecture. Importantly, due to the in-situ synthesis, Cs 2 AgBiBr 6 QDs are intercalated in the Ce-UiO-66-H frameworks and it could lead to improved stability and induce abundant oxygen vacancies in Cs 2 AgBiBr 6 /Ce-UiO-66-H, which can maintain unchangeable CO 2 conversion rate under wet air with consecutive ten hours of the recycling test. In this work, the combining metal–organic frameworks and lead-free halide perovskite provide great potential for artificial photocatalytic CO 2 -to-CO conversion under a mild gas–solid reaction condition via utilizing solar energy.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Huijiao Wang,Zhongyi Li,Fengyuan Zhang,Yuxiang Wang,Xian Zhang,Jianbing Wang,Xuwen He
Three types of Magnéli phase anodes (Ti/Ti 4 O 7 , Ti/Ti 4 O 7 -PbO 2 -Ce, and Ti/Ti 4 O 7 nanotube arrays (NTA)) were fabricated, characterized, and compared with other typical active and non-active anodes (i.e., BDD, Ti/Pt, Ti/RuO 2 -IrO 2 , and Ti/IrO 2 -Ta 2 O 5 ) for electro-oxidation treatment of p -nitrophenol (PNP) solution and a real coal chemical concentrated brine in this study. Characterization results indicate a nanotube array structure of Ti/Ti 4 O 7 NTA, and a compact coating of Ti 4 O 7 microparticles and PbO 2 -Ce nanocrystals on the Ti substrate for Ti/Ti 4 O 7 and Ti/Ti 4 O 7 -PbO 2 -Ce, respectively. The three anodes present relatively high oxygen evolution potentials (2.16–2.44 V vs SCE), showing good capacity of electro-generating reactive oxidative species for pollutant degradation. After 30 min of EO treatment, Ti/Ti 4 O 7 NTA and Ti/Ti 4 O 7 removed 89–92% of PNP, which were 10–60% higher than Ti/Pt, Ti/RuO 2 -IrO 2 , and Ti/IrO 2 -Ta 2 O 5 , and were almost comparable with BDD (95%). Furthermore, Ti/Ti 4 O 7 NTA and Ti/Ti 4 O 7 kept very efficient for mineralization of PNP solution and real coal chemical concentrated brine. For Ti/Ti 4 O 7 -PbO 2 -Ce, its degradation efficiency was lower than other two Magnéli phase anodes, but still competitive compared with other active anodes. Thanks to their high removal efficiencies, the three Magnéli phase anodes required relatively low energy demand for pollutant mineralization. Besides, operational parameters such as electrolyte and current density were also very significant for efficient pollutant removal. The results of this study suggest Magnéli phase electrodes as promising and cost-effective anode materials for industrial wastewater treatment, with Ti/Ti 4 O 7 NTA and Ti/Ti 4 O 7 being more efficient options.
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CARBON
·
2020
·
IF 8.821
Cai Xu,Leilei Jin,Xiaozhong Wang,Yingqi Chen,Liyan Dai
In heterogeneous catalysis , developing robust catalysts and preventing the metal leaching during the reactions still remain challenging. Herein, a porous honeycomb-like nanostructure with bimetallic Ce–Cr oxide supported on N-doped carbon was prepared via a facile in-situ pyrolysis method. The prepared catalyst was highly active, selective, and stable in the transformation of cyclohexane to KA oil with H 2 O 2 as the oxidant. The N-doped carbon served as an excellent support for the metal nanoparticles and greatly promoted their dispersion, and displayed a comparable or superior catalytic activity compared to the other traditional supports. It was found that the pyridinic N and pyrrolic N species of N-doped carbon were the main active sites for the metal immobilization , and the strong electronic interaction between N-doped carbon and Ce–Cr oxide was formed. The results revealed that the increased low-valence metal species might be responsible for the improved catalytic activity, and EPR analysis indicated that the hydroxyl radicals played a crucial role during the oxidation process . Besides, the catalyst can be easily separated and still remained stable after recycling seven times, making it a promising candidate for the catalytic oxidation of cyclohexane to KA oil under mild conditions.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Xuemei Wang,Yuan Ma,Zheng Zhou,Zhen Zhang,Jie Zhang,Lin Fan,Xinzhen Du,Xiaoquan Lu
Simple and rapid analytical methods for pharmaceuticals and personal care products (PPCPs) are in high demand for environment monitoring. Herein, an in-situ doping strategy was used to ultrarapid synthesize carbon black (CB)-doped Ce (III, IV)-MOF composite with dumbbell-shaped structure at room temperature, which had been used as an electrochemical sensor for the effective and simultaneous detection of typical PPCPs such as dopamine (DA) and acetaminophen (AC) in complex matrices samples using different pulse voltammetry (DPV). Scanning electron microscope (SEM), Nitrogen adsorption-desorption, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and X-ray powder diffractometer (XRD) were used to characterize the morphological and electrochemical properties of synthesized a series material. The mixed-valent CB/Ce (III, IV)-MOF with excellent pore structure properties provided more exposed active sites, which were more conducive to adsorption and thus improved sensing performance. The result showed that the proposed method had a wide linear range (for DA: 0.3–252.0 µM, for AC: 0.3–252.0 µM) and low detection limits (for DA: 0.0955 µM, for AC: 0.1170 µM). Based on the synergistic effect of both CB and Ce (III, IV)-MOF, the composites modified electrodes had excellent electroanalytical capability for DA and AC, which could be used for efficient and rapid monitoring of ECs and the construction of new electrochemical sensor based on MOFs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
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IF 5.2
Dongsheng Chen,Xiangyang Xu,Pengtao Lei,Jianyu Ge,Yuanlin Tong,Chenyu Huang,Xianghui Fu
Morphology control and heterostructure construction are two essential aspects in designing and synthesizing photocatalysts . Herein, hollow microsphere heterojunctions of CeO 2 and Ce 3+ doped BiOBr (Ce-BiOBr) were fabricated adopting a facile one-pot solvothermal approach. Owing to the positively charged Ce species, the interlamellar repulsion can be reduced and the specific surface area of these microsphere can be increased. The as-generated Ce 4+ /Ce 3+ redox centers can synergistically improve the transfer and separation efficiency of photogenerated carriers. When used to treat Congo red (CR), 0.1CBOB with a Ce/Bi molar ratio of 0.1:1 exhibits the best photodegradation efficiency (94.63%) and kinetic rate (0.01119 min −1 ) under visible light-emitting diode (LED) light irradiation , which are remarkably superior to pure BiOBr and CeO 2 . The results of radical capture experiment show that photogenerated hole (h + ), superoxide radical (·O 2 − ) are the main active species in the process of photocatalytic degradation.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 5
·3135-3150
·
IF 1.674
Wang Cheng-zhi,Zhao Yong-gang,Zhang Cheng,Yan Xin,Cao Peng
Honeycomb cordierite-based Mn–Ce/Al 2 O 3 (Mn–Ce/Al 2 O 3 –C) and Fe–Mn–Ce/Al 2 O 3 (Fe–Mn–Ce/Al 2 O 3 –C) catalysts were prepared by an impregnation method and investigated in low-temperature selective catalytic reduction (SCR) of NO with NH 3 at 100 °C. The Fe–Mn–Ce/Al 2 O 3 –C catalyst exhibited not only higher catalytic activity, but also much better SO 2 and H 2 O resistance in the presence of 30 ppm SO 2 and/or 5 vol% H 2 O than Mn–Ce/Al 2 O 3 –C. After doping Fe, the NO conversion of Mn–Ce/Al 2 O 3 –C catalyst displayed an increasing trend from 79 to 84% in the absence of SO 2 and H 2 O at 100 °C under a gas hour space velocity of 1667 h −1 . The results of characterization indicated that addition of Fe was advantageous to increase BET surface area, pore volume and inhibit loss of surface Mn and Ce species. Additionally, it was helpful for generating higher concentration of Mn 4+ , more chemisorbed oxygen and more uniform dispersion of amorphous Mn and Ce in the surface of catalyst, which were beneficial to interact with reactants. Furthermore, in contrast to Mn–Ce/Al 2 O 3 –C, the SCR activity of Fe–Mn–Ce/Al 2 O 3 –C catalyst in the presence of H 2 O, SO 2 and H 2 O and SO 2 were 79, 75 and 64%, with the increase of 14, 18 and 19%, respectively. It is indicated that the addition of Fe could inhibit sulfate formation and thus enhance SO 2 resistance. XPS results reveal that the doping of Fe into the ceria lattice led to some Ce 4+ transferred into Ce 3+ in order to maintain the electrical neutrality, thereby facilitating the reduction of Ce 4+ → Ce 3+ and the formation of oxygen vacancies. NH 3 temperature-programmed desorption (TPD) results imply that the doping of Fe onto Mn–Ce/Al 2 O 3 –C can remarkably improve the distribution and concentration of acid sites. All the above factors contributed to the improvement of overall NH 3 SCR performance of the Fe–Mn–Ce/Al 2 O 3 –C catalyst compared with that of the Mn–Ce/Al 2 O 3 –C catalyst.
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APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Xiaoqiang Wang,Yue Liu,Qingji Ying,Weiyuan Yao,Zhongbiao Wu
In this paper, a series of Nb modified Cu-Ce-Ti mixed oxides (Nb y CCT) were synthesized using wetness impregnation method for the selective catalytic reduction of NO with ammonia (NH 3 -SCR). The activity tests indicated that Nb y CCT catalysts had shown superior SCR performances. Among which, Nb 0.05 CCT catalyst exhibited a NO conversion of more than 90% within a broad operation temperature window (180–360 °C) under the GHSV of 40,000 h −1 . After that, corresponding characterizations were performed to correlate the physical structures and surface properties to catalytic performances. These results revealed that the strong interactions among the active phases induced by Nb addition could not only enhance the redox property of the catalysts but also inhibit the over-oxidation of NH 3 , which would be beneficial to SCR performance within a wide temperature range and good reaction selectivity. Furthermore, DRIFTS results suggested that the doping of Nb could promote the formation of NO 2 , thereby enhancing the “fast” SCR reaction process (Langmuir-Hinshelwood reaction pathway). Moreover, the Nb 0.05 CCT catalyst showed a better sulfur tolerance compared to Nb free catalyst that over 85% NO conversion could be retained after 12 h SCR reaction in the presence of SO 2 and H 2 O.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Wuyang Li,Chan Xie,Peng Zhang,Zhonghao Zhang,Mingshan Xue,Zuozhu Yin,Yidan Luo,Zhen Hong
Traditional mono-functional anti-corrosion coatings are unable to meet the long-term corrosion resistance requirements of metal materials, therefore developing multifunctional anti-corrosion coatings have broad application prospects. In this work, long-lasting anti-corrosion coatings with superhydrophobic and self-healing properties were successfully prepared by in-situ growth of dual-ligand cerium-based metal–organic framework (Ce-MOF) on the surface of graphene oxide (GO), followed by chemical modification with polydopamine (PDA), resulting in 5B level of adhesion and excellent mechanical robustness. The superhydrophobic surface, as the external armor of the coating, can effectively block the penetrating path of corrosive media. Meanwhile, the MOF structure formed by the coordination of 2-mercaptobenzimidazole (2-M) with cerium ions endows the coating with smart self-healing properties and long-lasting corrosion resistance. Electrochemical tests showed that the low-frequency impedance modulus value of the superhydrophobic coating still reached 3.82 × 10 8 Ω cm 2 after 30 days salt immersion. Due to the formation of protective films and insoluble precipitates at the defect site by 2-M and cerium ions, the scratches on the coating were significantly reduced after 40 days salt spray experiment, demonstrating the self-healing ability of the coating. This multifunctional anti-corrosion coating provides a new approach for preparing coatings with long-term effective corrosion resistance.
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高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 10
·4021-4027
·
IF 4.58
Wang Xiaole,Niazi Sobia,Yukun Huang,Sun Weijia,Wu Shijia,Duan Nuo,Hun Xu,Wang Zhouping
The authors describe an aptasensor based on time-resolved fluorescence resonance energy transfer (TR-FRET) for the identification of Salmonella typhimurium ( S. typhimurium ). Aptamer-functionalized nanoparticles (NPs) is used as the energy donor, and a complementary oligonucleotide (cDNA) labeled with carboxyfluorescein (FAM) acts as the acceptor. The detection scheme is based on the hybridization between aptamer and cDNA, upon which photonic energy is transferred from NPs to FAM unless aptamer interacts with S. typhimurium . Due to the highly specific recognition ability of aptamer and the strong fluorescence intensity of NPs, the method is highly sensitive and selective for S. typhimurium . Under the optimal conditions, at excitation wavelength of 273 nm, a delay time of 100 μs and a gating time of 1 ms, the integrated time-resolved fluorescence intensity ratio (FAM 520 /Tb 489 ) is linear in the 100 to 10 6 cfu·mL −1 range, and the limit of detection is as low as 25 cfu·mL −1 . The assay was applied to the analysis of eggs and chicken meat for S. typhimurium , and the results were consistent with those of a plate-counting method.
Schematic of a homogeneous time-resolved FRET assay for the determination of Salmonella typhimurium by FRET between NaYF 4 :Ce/Tb nanoparticle-tagged aptamer and FAM-cDNA, with a good linearity and the limit of detection of 25 cfu mL −1 .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
·
IF 3.205
Yushan Hou,Jianfang Wu,Elena Yu. Konysheva
Quantitative analysis of Cr-adsorption from a gas phase on CeO 2 , pure and doped BaCeO 3 was performed in combination with surface techniques and electrochemical impedance spectroscopy . The Cr-adsorption on BaCeO 3 is 3 times higher than on CeO 2 and it increases by 12–25% on In doping in Ba(Ce 1−x In x )O 3 (x = 0.1–0.3) in the temperature range of 600–700 °C. These perovskites adsorb chromium with the formation of a multi-phase surface layer containing BaCr 6+ O 4 and cerium oxide. Coexistence of small fractions of Cr 3+ and Cr 5+ cations in the surface layer was identified by X-ray photoelectron spectroscopy. The thickness of the surface layer and its morphology vary with temperature, affecting the conductivity of Ce containing perovskites below 700 °C. BaCrO 4 exhibits under air noticeably larger anisotropic thermal expansion than BaCeO 3 . The results indicate that high tolerance to Cr-gaseous species should be considered as an important criterion for further development of materials for proton-conducting SOFCs.
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危险品化学品经营许可证（带存储）