Waste and Biomass Valorization
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2024
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IF 2.6
Luo Bo,Liu Huiyu,Shan Rui,Zhang Jun,Yuan Haoran,Chen Yong
Purpose This work aims to investigate the thermal behavior and kinetic characteristics of polyethylene (PE) pyrolysis over Cu/Ce modified ZSM-5. The influences of metal types, particles size of active center and interaction of Cu–Ce species on products distribution are elucidated. Methods Metal-modified ZSM-5 catalysts were prepared by negative pressure impregnation method. Catalytic fast pyrolysis and thermogravimetric experiments were conducted using Py–GC/MS and TG/MS for the qualitative and quantitative analysis of pyrolysis products. Results Morphology characterization indicated the interaction of Cu–Ce species facilitated the regulation of active center size into a nanoparticle scale. The final products were restricted to a carbon number of less than 9 over CuCe/ZSM-5. Cu–Ce modification increased the aliphatic content from 58.5 to 76.1%. Kinetic analysis revealed a remarkable reduction in activation energies during both the intermediate and final stages, where an average decrease of 30% was achieved. Conclusion The synergistic effects of Cu 0 and CeO x facilitated the formation of more short chain olefins by enhancing C–C bonds cleavage activity. Undesired polycyclic aromatic hydrocarbons (PAHs) were avoided by the optimal steric hindrance of CuCe/ZSM-5. Graphical Abstract
研究领域:
能源化学
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催化材料科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
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2021
·Vol. 52
·期 3
·573-581
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IF 2.8
Zhao Ruiyu,Wang Yi Mou,Li Jie,Meng Wenhua,Yang Chunli,Sun Chongxiang,Lan Xuefang
Ni, Ce, and Ta modified Ti/SnO 2 –Sb 2 O 5 –RuO 2 anodes were first prepared by thermal decomposition strategy and applied for Orange G degradation to explore the effect of Ni, Ce, and Ta modification on electrocatalytic property. The Ta modified anode showed the highest ·OH generation capability and the lowest charge transfer resistance among all samples, conducive to electrocatalytic degradation of Orange G. Besides, the Ta modified anode shows more cracks than Ni and Ce modified anodes, which is expected to create more specific surface areas and more exposed active sites for Orange G degradation. The degradation efficiency and the total organic carbon (TOC) removal rate increased in the order Ru < Ru–Ni < Ru–Ce < Ru–Ta, with Ru–Ta showing the highest degradation efficiency of 98.6% and 44.2%, much higher than 79.6% and 27.5% of Ru, respectively.
Graphical abstract
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
TALANTA
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2023
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IF 6.1
Baisen Chen,Rongxia Tan,Yanhui Zhong,Yufei Hu,Gongke Li
Ce-PA-Tb polymer with Ce and Tb as metal ion centers was prepared and applied in chemiluminescence (CL) reaction. The structure and property of Ce-PA-Tb were explored. Ce-PA-Tb combines both the oxidant ion (Ce(IV)) and luminescence ion (Tb(III)). Difloxacin can enhance the CL signal of Ce-PA-Tb-SO 3 2- reaction in acidic medium. Under the optimized affecting factors, a CL method for the selective difloxacin determination was established. The CL intensity showed a good linear relationship from 10.0 to 300.0 μg/L (r = 0.9996) with the limit of detection was 1.1 μg/L. The method with the signal response at 0.5 s and completed the CL process within 10 s. The method was used to determine difloxacin in aquatic products, and the recovery rate was in the range of 88.1%–104.0%. The CL method designed Ce-PA-Tb based is demonstrated to be an excellent tool for difloxacin determination in aquatic products.
研究领域:
分析化学
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食品科学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2020
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IF 5.578
Xianyao Yan,Yingjie Li,Chaoying Sun,Zeyan Wang
In this work, H 2 production performances from Enteromorpha prolifera and its char by absorption-enhanced steam gasification using Ce-doped CaO material were investigated. The Ce-doped CaO material improves the H 2 production from Enteromorpha prolifera by steam gasification, which achieves 79.0 vol% H 2 in the syngas. The Ce-doped CaO material with the mass ratio of CeO 2 /CaO = 10:90 seems more appropriate for high H 2 production, tar and char conversion. The presence of CeO 2 leads to good cyclic stability in H 2 production from Enteromorpha prolifera char during the gasification/calcination cycles. After 20 cycles, H 2 concentration and yield from Enteromorpha prolifera char achieve 77.8 vol% and 141.8 mL/g using Ce-doped CaO material, respectively. The CeO 2 facilitates the conductivity of electrons in CaO surface due to the existence of Ce 3+ species, thus CO 2 capture, water gas shift, and steam methane reforming reactions are promoted by CeO 2 . The Ce-doped CaO material maintains the porous microstructure and fine particles during the cycles due to the support of CeO 2 . Therefore, H 2 productions from Enteromorpha prolifera and its char by absorption-enhanced steam gasification using Ce-doped CaO material appear promising.
研究领域:
能源与环境科学
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生物质能
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Dongsheng Luo,Hongfei Yin,Jingxin Li,Binqiang Tian,Huaiqi Li,Yaoguang Li,Chunguang Li,Yuehua Zhang,Mengqi Chen,Yanqiu Jing
Nowadays, researchers make great effects to eliminate some harmful chemicals produced by tobacco. Photocatalysis is one of the most advanced techniques and can degrade organic contaminants effectively. In this paper, a novel CoS@ZnIn 2 S 4 -Ce heterostructured cage was successfully prepared for degradation. After various characterizations, CoS@ZnIn 2 S 4 -Ce exhibited a significant separation of the photo-generated electrons and holes and could degrade phenol effectively no matter under UV light (98.46 %) or visible light (96.72 %). Furthermore, CoS@ZnIn 2 S 4 -Ce could degrade nicotine (91.62 %), benzopyrene (84.65 %) and nitrosamine (99.18 %) effectively under visible light. The effects of the initial conditions on degradation of phenol was also well investigated. The optimal conditions were 0.5 g/L of catalyst dosage, 4.35–7.00 of pH value and 10 mg/L of phenol initial concentration. OH and O 2 − were the main active radicals during the photo-degradation process. On this basis, a possible photocatalytic degradation pathway for degradation of contaminants produced by tobacco are proposed.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2023
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IF 5.2
Yukun Li,Yongfu Liu,Zhaohua Luo,Zehua Liu,Svenja Hanson,Chengheng Pang,Hui Lin,Haiming Qin,Jun Jiang
Ce/Mn/Cr: Y 3 Al 5 O 12 transparent ceramics with a pure garnet structure and a high color rendering index were prepared by a solid-state reaction method. Mn 2+ and Cr 3+ enhance the emission between 500 and 700 nm and expand the conventional Ce: YAG phosphors spectrum. The Ce 3+ can work both, as activators and sensitizers, and the intense energy transfer from Ce 3+ to Mn 2+ /Cr 3+ is realized through the non-radiative and radiative processes. In the sample with the optimized doping concentration the high color rendering index (CRI) value of 75.3 can be achieved under a 450 nm laser diode excitation. The chromaticity coordinates can be tuned from (0.3125, 0.3232) to (0.2917,0.2851) by varying the doping concentration. With the increasing Mn 2+ /Cr 3+ doping concentration, the lifetime of Ce 3+ , quantum efficiency and luminous efficiency are all gradually decreased. This work effectively offers a scheme for realizing the high color rendering performance of phosphor-converted transparent ceramics in white LEDs/LDs.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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IF 5.455
Yupeng Zhai,Jialin Yu,Lijuan Zhang,Yunshan Zhou,Yuxu Zhong,Ying Yang,Yong’An Wang
In this study, an α-Keggin-type polyoxometalate H 5 PV 2 Mo 10 O 40 was loaded into the adamantane cage (18 Å) of MOF-808(Ce) by an immersion method to obtain composites with different polyoxometalate loadings. The effects of the H 5 PV 2 Mo 10 O 40 loading in the composite, the reaction time, and the quantity of the composite during the decontamination of the erosive agent surrogate, 2-chloroethyl ethyl sulfide (CEES) were investigated, and the optimized catalytic conditions for CEES were determined. The decontamination rate of 4 μL CEES reached 93.91% in 120 min using 40 mg of optimized composite, and the decontamination rate of 160 μL of the nerve agent surrogate, methyl paraoxon (DMNP) reached 100% in 25 min using 5 mg of the composite. Decontamination of CEES and DMNP by the composite followed first-order reaction kinetics. The half-life ( t 1/2 ) and kinetic rate constant ( k ) of these two reactions were 27.77 min and −0.02496 min −1 and 1.895 min and −0.36569 min −1 , respectively. The composite exhibited good decontamination performance after four replicate experiments. The results showed that CEES was oxidized to CEESO, while DMNP was hydrolyzed to p -nitrophenol and dimethyl phosphonate in the presence of the composite, showing that the proposed composite is an effective bifunctional catalyst for the selective oxidation and hydrolysis of chemical warfare agent surrogates.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
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2025
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IF 6.3
Lei Wang,Zhe Li,Dongdong Tuo,Mingze Li,Mengtong Guo,Wenqian Zhang,Xiaodong Wang,Fuxin Hang,Ying Zhang
Heavy metal pollution is becoming increasingly severe, and rare earth elements (REEs) play a crucial role in influencing the environmental impact of heavy metals. Mixed heavy metal pollution presents a significant challenge due to its complex effects. While many studies have focused on single heavy metal pollution, relatively few have examined the pollution caused by rare earth-heavy metal composites. This study investigated the toxic effects of Ce-Zn compound pollution on maize roots and used the integrated biomarker response (IBR) to assess the toxicity of different concentrations of Ce-Zn compound pollution on maize roots. The results showed that Ce-Zn compound pollution had a threshold effect: promoting maize growth at low concentrations but inhibiting growth at a threshold concentration of Ce 50 mg/kg-Zn 50 mg/kg. Ce-Zn compound pollution-induced oxidative stress in maize. When the pollution concentration exceeded the threshold, the H₂O₂ content in maize roots increased by 3.30 and 3.56 times, respectively, compared to the CK group, while the O₂⁻ content increased by 1.45 and 1.48 times, respectively. Cell structure damage was observed, and the levels of antioxidant enzymes—peroxidase (POD), catalase (CAT), and superoxide dismutase (SOD)—in maize roots gradually increased. At low concentrations, the Ca²⁺ absorption rate in maize roots increased by 82.99 % compared to CK. By regulating the Ca²⁺ concentration, the absorption of H⁺ and other ions was affected, enhancing intracellular enzyme activity and improving the tolerance of maize roots to compound pollution. These findings enhance our understanding of the harmful effects of combined pollution from rare earth metals and heavy metals on plants.
研究领域:
植物学
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环境科学
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毒理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Lifeng Hao,Junhuan Zhao,Kangyuan Li,Weiping Zheng,Yanfei Yang,Chenyang Qiu,Zewen Jiang,Wenjun Xia
We report a hydrothermal engineering strategy to synergistically regulate structural barriers, oxygen vacancy-driven redox cycling, and surface functionalization in Ce-NiCo-LDH coatings for ultralong corrosion protection. Vertically aligned LDH nanosheets constructed a tortuous labyrinth barrier to physically impede corrosive species penetration. Oxygen vacancies acted as electron reservoirs to drive Ce 3+ /Ce 4+ redox cycling, enabling dynamic passivation repair via preferential Ce 4+ → Ce 3+ reduction at vacancy sites. Surface functionalization further enhanced protection through two independent pathways: CTAB induced interlocked fibrous nanostructures for mechanical reinforcement, while PFDT grafting formed a fluorine-rich hydrophobic barrier through C-F dipole interactions. EIS characterization demonstrated a 3.6-fold enhancement in charge transfer resistance (Rct = 5.1 × 10 5 Ω·cm 2 ) for the sequentially hydrothermally processed Ce-NiCo-LDHs compared to their single-step counterparts (1.4 × 10 5 Ω·cm 2 ). The CTAB-modified coating achieved 99.0 % inhibition efficiency, while PFDT modification provided long-term hydrophobicity. This triple-scale synergy-structural obstruction, redox-mediated self-healing, and surface engineering-provides a universal framework for designing advanced protective coatings.
研究领域:
材料科学
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腐蚀工程
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表面工程
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xinyu Zeng,Yang Li,Jia Dong,Jingli Li,Zhaoyu Yang,Chunlin Song,Gang Liu,Yan Yan
In the current study, a series of CeO 2 -doped ( x = 0.01, 0.015, 0.02, 0.025 mol) ceramic samples were prepared, and the valence of Ce in the perovskite was analyzed in detail, revealing the polarization contribution and effect mechanism of the doped Ce element in the 0.65BaTiO 3 –0.35Sr 0.7 Bi 0.2 TiO 3 ceramic. The phase structure and electrical stored energy performance of the resulting ceramics were also characterized. It was found that adding an appropriate amount of CeO 2 to BaTiO 3 was helpful for improving the relaxor behavior, promoting electric storage, and releasing ceramic materials. Particularly, the electric breakdown strength of the 0.02Ce-doped specimen reached 330 kV/cm, and the corresponding density and efficiency were 2.57 J/cm 3 and 81.30%, respectively. In addition, doping with Ce caused the ceramics to exhibit good stability at frequencies of 1–300 Hz and over a temperature range of 30–150 °C. A high current density ( C D ) and power density ( P D ) were obtained in charge–discharge tests.
研究领域:
材料科学
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能源存储
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
NUCLEAR TECHNOLOGY
·
2023
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IF 1.5
Guanghui Wang,Hui He,Yaorui Li,Meng Zhang,Yang Gao,Caishan Jiao
The contaminated solvent from the Purex process is washed with alkaline detergents such as sodium carbonate, which generates a large amount of secondary wastes. Therefore, hydrazine carbonate as a salt-free reagent deserves to be studied in depth. In this study, the Ce(IV), U(VI), and Zr(IV) metal ions in organic phases containing dibutyl phosphate (HDBP) of 30% tributyl phosphate (TBP)–dodecane were washed with hydrazine carbonate. The effects of the oscillation time (1 to 15 min); temperature (25°C to 85°C); cumulative number of washes (one to four times); mass fraction of hydrazine carbonate (0.1% to 20%); volume ratio of the aqueous phase to the organic phase (0.2 to 5); HDBP concentration (0 to 0.4 M); HNO3 concentration (0.05 to 8 M); and concentration of Ce(IV), U(VI), and Zr(IV) metal ions on the removal percentages of Ce(IV), U(VI), and Zr(IV) metal ions in polluted solvents were studied. The results showed that when the organic phase containing 0.02 M HDBP was washed three times with 5% hydrazine carbonate at 25°C, the removal percentages of the Ce(IV), U(VI), and Zr(IV) ions were 96%, 98%, and 94%, respectively. Meanwhile, the retention concentrations of the three in the organic phase were 35, 28, and 78 mg/L, respectively. The increase of the mass fraction of hydrazine carbonate enhances the removal of the metal ions from the organic phase into the aqueous phase. High acid is not conducive to alkaline washing of metal ions. The increase of HDBP concentration not only promotes extraction but also increases the retention capacity of the organic phase and has the most significant effect on Zr(IV). U(VI) promotes the preferential washing of Zr(IV) while Ce(IV) increases the metal retention concentration of Zr(IV) in the organic phase.
研究领域:
化学工程
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核化学与化工
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2015
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IF 2.947
Xiaowei Chi,Zhaoyin Wen,Jingchao Zhang,Yu Liu
A novel hybrid route, combining simple co-precipitation and conventional solid state reaction, is proposed for the first time to synthesize BaCe 0.4 Zr 0.4 Y 0.2 O 3− δ powders at a temperature as low as 1150 °C. This temperature is much lower than that used for conventional solid state reaction method and even comparable to that used in sol–gel route. The reasons for the low calcination temperature are analyzed in detail from the macroscopic to microscopic viewpoints. Moreover, with the powders made by the novel method, dense ceramic could be easily obtained. Further, impedance data illustrated that its electrical conductivity in wet H 2 at 750 °C is up to 1.39 × 10 −2 S/cm, which is the highest among all the samples prepared by the three different methods and much higher than the reported results related to BCZY proton conductors . Also, the new method is particularly suitable for other multi-component oxides .
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）