JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Yang Wan,Huijie Wang,Jiejing Liu,Xin Liu,Xianghai Song,Weiqiang Zhou,Jisheng Zhang,Pengwei Huo
Waste plastics have posed enormous to the environment, but their recycling, especially polyethylene terephthalate plastics, was still a huge challenge. Here, CdS/CeO 2 was used as the photocatalyst to promote the degradation of PET-12 plastics by activating peroxymonosulfate (PMS) synergistic photocatalytic system. The results showed that 10 % CdS/CeO 2 had the best performance under the illumination condition, and the weight loss rate of PET-12 could reach 93.92 % after adding 3 mM PMS. The effects of important parameters (PMS dose and co-existing anions) on PET-12 degradation were systematically studied, and the excellent performance of the photocatalytic-activated PMS system was verified by comparison experiments. SO 4 •− contributed the most to the degradation performance of PET-12 plastics, which was demonstrated by electron paramagnetic resonance (EPR) and free radical quenching experiments. Furthermore, the results of GC showed that the gas products including CO, and CH 4 . This indicated that the mineralized products could be further reduced to hydrocarbon fuel under the action of the photocatalyst. This job supplied a new idea for the photocatalytic treatment of waste microplastics in the water, which will help recycle waste plastics and recycle carbon resources.
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Wenshuo Hu,Renzhi Zou,Yi Dong,Yu Zhang,Mingchu Ran,Qi Xin,Yang Yang,Hao Song,Weihong Wu,Shaojun Liu,Chenghang Zheng,Xiang Gao
Enhancement of the low-temperature (LT) performance of selective catalytic reduction (SCR) of NOx with NH3 has been a spotlight in environmental catalysis. Here, we use a bifunctional catalytic system mixing V–W/Ti with an oxidative component, i.e., MnOx/CeO2, to achieve both improved LT-SCR activity and N2 selectivity. An integrated approach of steady-state kinetic measurements, chemical trapping techniques, time-resolved in situ FTIR spectroscopy, and density functional theory (DFT) calculations reveals that such a synergistic enhancement is at a short distance and is significant when V–W/Ti and MnOx/CeO2 are in intimate contact. These findings further suggest a bifunctional LT-SCR pathway mediated by a short-lived, mobile nitrite-precursor intermediate, which is facilely generated on the oxidative component and then communicates with the adjacent SCR phase through reacting with the abundant NH3 adsorbates there. Assembling such a mechanism with commercial SCR catalysts, accordingly, acts as a promising way to enhance the LT-SCR performance.
研究领域:
环境催化
·
材料科学
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Xiaorui Zhang,Yu Mei,Hao Cheng,Jianfeng Ma,Fang Zhu,Sridhar Komarneni
NiO and CeO 2 composite metal oxides (NiO–CeO 2 ) were synthesized by sol-gel method to investigate a degradation system by persulfate (PS) activation with the assistance of visible light (Vis). The phase composition of NiO–CeO 2 was detected by X-ray diffraction (XRD), the morphology of NiO–CeO 2 was characterized by scanning electron microscope (SEM), and the result of X-ray photoelectron spectroscopy (XPS) proved the element composition and valence state of the NiO–CeO 2 . In the Vis/PS/NiO–CeO 2 system, the degradation rate of Orange II using a concentration of 50 mg/L was as high as 90% in 15 min but it increased to as high as 99% in 60 min. Mechanism studies have shown that the combination of NiO and CeO 2 generated more oxygen vacancies , and activated persulfate to generate active oxygen species. Moreover, the effects of visible light , persulfate concentration and pH were evaluated, and the results showed that the participation of visible light and persulfate could significantly increase the degradation efficiency of Orange II, but pH had little effect on the degradation. Quenching experiments and detection by ESR showed that O 2 ‾, •SO 4 ‾, •OH, and 1 O 2 all contribute to the removal of Orange II. In addition, the recovery and reuse properties of NiO–CeO 2 may lead to sustainable treatment of wastewater.
研究领域:
环境科学
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材料科学
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 34
·18338-18348
·
IF 12.732
Wei Xiong,Tao Huang,Yuqing Feng,Xue Ye,Xiaoyan Li,Jianneng Liang,Shenghua Ye,Xiangzhong Ren,Yongliang Li,Qianling Zhang,Jianhong Liu
Solid-state electrolytes (SSEs) are promising alternatives to traditional liquid electrolytes because of their safety issues. However, polymer SSEs have low ionic conductivity and weak mechanical strength, and inorganic SSEs are very brittle and unstable to lithium metal and atmospheric moisture, which restricts their practical applications. To avoid these disadvantages, it is essential to develop polymer–inorganic composite SSEs. In this work, we for the first time construct a solid composite polymer electrolyte of poly(vinylidene fluoride hexafluoropropylene) (PVDF-HFP) blended with Li1.3Al0.3Ti1.7(PO4)3 and flower-like CeO2 particles enriched with oxygen vacancies as inorganic fillers. The composite SSEs exhibit a wide electrochemical window of 5.1 V (vs. Li/Li+) and high ionic conductivity of 1.66 × 10−3 S cm−1 at room temperature. The conductivity enhancement originates from the oxygen vacancies associated with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) for releasing more lithium ions, and CeO2 is also beneficial for the suppression of Li dendrites. The solid-state LiFePO4/SSE/Li cell exhibits superior electrochemical performance at room temperature, the capacity is as high as 166.6 mA h g−1 at 0.1C, and the cell can sustain 83.1 mA h g−1 at 2C after 1000 cycles.
研究领域:
材料科学
·
能源存储
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高影响因子
Energy Materials
·
2025
·Vol. 5
·期 8
·N
·
IF 11.2
Baoyu Wang,Ximing Yan,Ming Zhou,Hu Li
Lignin-based guaiacol and its derivatives can be hydrogenated to synthesize 2-methoxycyclohexanols (2-MCHs), widely used in the pharmaceutical industry, while the efficient catalytic conversion of guaiacols into 2-MCHs is challenging due to the interference of the side reaction of CAr-OCH3 bond cleavage. In this work, highly selective hydrogenation of various guaiacyl lignin-derived phenols to 2-MCHs (yields of 86%-97%) was realized over a single-atom Ru-based catalyst (Ru1/o-CeO2-ov) that preferentially exposes the CeO2(111) plane and has abundant oxygen vacancies. Control experiments and mechanism studies expounded that Ru-O-Ce is the active site for hydrogenation of aromatic ring in guaiacols, and the exposed (111) plane and abundant oxygen vacancies of ceria can reduce the activation energy of aromatic ring hydrogenation, thereby enabling guaiacols to generate the corresponding hydrogenated products with high selectivity. Response surface optimization experiments indicated that temperature and time have relatively more significant effects on the 2-MCH yield. Moreover, the Ru1/o-CeO2-ov catalyst exhibited excellent reusability, and was extensively applicable to the hydrogenative dearomatization of different types of lignin-derived phenols, providing a unique solution for upgrading biomass feedstock into specific structural chemicals.
研究领域:
催化化学
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生物质转化
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材料科学
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高影响因子
Small
·
2023
·Vol. 20
·期 13
·2308743
·
IF 13.3
Hui Yang,Lu Jia,Qitao Zhang,Saisai Yuan,Teruhisa Ohno,Bin Xu
Long-term exposure to low concentration indoor VOCs of acetaldehyde (CH 3 CHO) is harmful to human health. Thus, a novel isogenous heterojunction CeO 2 /Ce-MOF photocatalyst is synthesized via a one-step hydrothermal method for the effective elimination of CH 3 CHO in this work. This CeO 2 /Ce-MOF photocatalyst performs well in CH 3 CHO removal and achieves an apparent quantum efficiency of 7.15% at 420 nm, which presents ≈6.7 and 3.4 times superior to those generated by CeO 2 and Ce-MOF, respectively. The enhanced efficiency is due to two main aspects including i) an effective photocarrier separation ability and the prolonged reaction lifetime of excitons play crucial roles and ii) the formation of an internal electric field (IEF) is sufficient to overcome the considerable exciton binding energy, and increases the exciton dissociation efficiency by up to 50.4%. Moreover, the reasonable pathways and mechanisms of CH 3 CHO degradation are determined by in situ DRIFTS analysis and simulated DFT calculations. Those results demonstrated that S-scheme heterojunction successfully increases the efficiency of harmful volatile organic compounds elimination, and it offers essential guidance for designing rare earth-based MOF photocatalysts.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Tuya Naren,Guojuan Jing,Lei Xue,Qi Wang,Yuansong Zhao,Caixia Li,Suhong Lu,Jinfang Wu,Shanghong Zeng
The development of superior catalysts for preferential oxidation of CO has always maintained challenging in heterogeneous catalysis . Herein it is found that the Pt 0.05 /CuO–CeO 2 catalyst exhibited high activity and selectivity for preferential oxidation of CO at working temperature of proton-exchange membrane fuel cells (~80 °C). The studies indicate that the presence of platinum and cerium promote the generation of oxygen vacancy and the dissociation of O 2 molecules. Meanwhile, the introduction of platinum facilitates the reduction of copper and cerium species as well as enhances the quantity of lattice oxygen. The timely update of lattice oxygen promotes CO oxidation with the help of oxygen vacancy. The finding may provide new ideas for developing the excellent ternary catalyst for preferential oxidation of CO at the proton-exchange membrane fuel cells working temperature.
研究领域:
催化
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材料科学
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燃料电池技术
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高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2021
·Vol. 30
·期 5
·3795-3805
·
IF 1.819
Mao Xisong,Xia Xuewen,Li Junqi,Chen Chaoyi,Zhang Junshan,Ning Deyang,Lan Yuan-Pei
Homogeneously rare-earth (RE=La, Sm and Y) ions doped CeO 2 nanoparticles (NPs) with enhanced photocatalytic performance were synthesized by a facile KOH-NaOH molten flux method. XRD, TEM, EDS mapping and XPS results demonstrate that RE cations have been successfully doped into the CeO 2 lattice, which leads to the lattice expansion/shrinking, and more oxygen vacancies are generated after RE ions doping. The UV-Vis DRS and PL spectra indicate that RE-doped CeO 2 samples have slightly narrower band gaps and significantly reduced photo-generated electron-hole recombination rates. 5% RE ions doped CeO 2 NPs show excellent photocatalytic performances and the photodegradation ratio of methylene blue (MB) increases from 71.63% of undoped CeO 2 to 76.35%, 77.51% and 77.37% for 5%-La, 5%-Sm and 5%-Y-doped CeO 2 NPs, respectively. The obviously reduced recombination rate of e − /h + pairs after RE ions doping may be the critical factor for the enhanced photocatalytic performance.
研究领域:
材料科学
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环境科学
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高影响因子
Analytical Methods
·
2017
·Vol. 10
·期 1
·76-83
·
IF 1.9
Xue Jiao,Wanyi Liu,Di Wu,Wenhao Liu,Hongjie Song
The development of highly efficient nanomaterial-based mimetic enzymes is much needed to replace natural enzymes due to their low cost, high stability and efficient catalytic ability. Herein, multiple Mo-doped CeO2 nanoparticles (Mo/CeO2 NPs) with different molar ratios of Mo were synthesized using a facile microwave-assisted method. For characterizing the as-prepared Mo/CeO2 NPs, XRD, TEM, HRTEM, BET and XPS have been performed systematically. The peroxidase-like activity of Mo/CeO2 NPs was investigated, and they exhibited enhanced peroxidase-like activity in comparison to that of pure CeO2 NPs, the best peroxidase-like activity was obtained for the Mo/CeO2 NPs when the molar ratio of Mo was 9%. On the basis of the high activity of Mo/CeO2 NPs, the reaction provides a simple, sensitive and selective method for colorimetric detection of glucose with the detection limit of 4 × 10−7 mol L−1 and in a dynamic range from 5 × 10−7 to 5 × 10−5 mol L−1. This work will pave a way for high throughput synthesis of other ultra-small doped metal oxide nanoparticles, which have bright prospects in biomedical analysis.
研究领域:
生物医学分析
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材料科学
·
酶工程
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DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 18
·1498
·
IF 4.4
Penghui Lei,Xiaoyu Ji,Jie Qiu,Jiaxuan Si,Tao Peng,Changqing Teng,Lu Wu
Large-grained UO2is considered a potential accident-tolerant fuel (ATF) due to its superior fission gas retention capabilities. Irradiation experiments for cerium dioxide (CeO2), used as a surrogate fuel, is a common approach for evaluating the performance of UO2. In this work, spark plasma sintered CeO2pellets with varying grain sizes (145 nm, 353 nm, and 101 μm) and a relative density greater than 93.83% were irradiated with 4 MeV Xe ions at a fluence of 2 × 1015ions/cm2at room temperature, followed by annealing at 600 °C for 3 h. Microstructure, including dislocation loops and bubble morphology of the irradiated samples, has been characterized. The average size of dislocation loops increases with increasing grain size. Large-sized dislocation loops are absent near the grain boundary because the boundary absorbs surrounding defects and prevents the dislocation loops from coalescing and expanding. The distribution of bubbles within the grain is uniform, whereas the large-sized and irregularly shaped xenon bubbles observed in the small grain exhibit pipe diffusion along the grain boundaries. The bubble diameter in the large-grained pellet is the smallest. As the grain size increases, the volumetric swelling of the irradiated pellets decreases while the areal density of Xe bubbles increases. Elemental segregation, which tends to occur at dislocation loops and grain boundaries, has been analyzed. Large-grained CeO2pellet with lower-density grain boundaries exhibits better resistance to volumetric swelling and elemental segregation, suggesting that large-grained UO2pellets could serve as a potential ATF.
研究领域:
核材料科学
·
材料物理
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jing He,Xiao Yang,Zehui Zhu,Xue Luo,Cai-e Wu,Yan Cui,Qingzhi Ge,Jian Qiu,Leilei Xu,Mindong Chen
Cerium dioxide (CeO 2 ) supported palladium (Pd) catalysts have found widespread application in CO oxidation reaction owing to their exceptional catalytic performance. The morphology of the CeO 2 support dictates the exposed crystal plane, exerting a profound influence on surface structure and redox properties. This is crucial as the atomic arrangement at the surface directly impacts catalytic activity. In this study, a range of CeO 2 supports with diverse morphologies ( e.g. nano-octahedra, nano-cubes, nano-particles, nano-spheres, and nano-rods) were successfully synthesized through hydrothermal methods and subsequently supported with Pd for CO oxidation. The spherical 1Pd/CeO 2 –S catalyst, revealing exposed (111) + (100) crystal planes, exhibited significantly higher CO catalytic oxidation activity compared to the catalysts with other morphological CeO 2 supports. The results indicated a positive correlation between the content of Pd x Ce 1-x O 2-y species and catalytic activity. Notably, this species was most abundantly formed in the spherical 1Pd/CeO 2 –S catalyst with exposed (111) + (100) crystal planes. The presence of this active species facilitated the formation of surface defects , increased oxygen vacancy concentration, and enhanced metal-support interaction, consequently greatly improving the CO low-temperature catalytic oxidation activity. Consequently, the oxidation state of Pd in the Pd/CeO 2 catalyst could be effectively regulated by controlling the exposure of (111) + (100) crystalline surfaces of the CeO 2 support, further optimizing the catalytic performance of the Pd/CeO 2 catalytic system.
研究领域:
催化
·
材料科学
·
化学工程
·
环境科学
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DOI
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Guangyi Cai,Song Xiao,Chunming Deng,Dan Jiang,Xinxin Zhang,Zehua Dong
CeO 2 nanoparticles grafted on carbon nanotubes (CNTs) with polydopamine (PDA) as interface layer (CeO 2 -PDA-CNTs) were prepared and dispersed into polyurethane (PU) to enhance the corrosion barrier of PU coating. Electrochemical impedance spectroscopy (EIS), wire beam electrode (WBE) technique and surface characterization demonstrate that CeO 2 -PDA-CNTs/PU composite coating significantly possesses the better corrosion and permeation resistance than other PU-based coatings. The barrier performance of the composite coating is mainly ascribed to the sandwiched CeO 2 -PDA-CNTs nanostructure, which achieves synergistic effect between the corrosion inhibition of CeO 2 and the bonding strength reinforcement and permeation pathway twist due to PDA wrapped CNTs.
研究领域:
材料科学
·
腐蚀防护
·
表面工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）