CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Kun Hu,Qingjie Xie,Huijuan Wang,Bo Zhang,Yuyue Huang,Shilin Song,Huihui Zhang,Yixiao Ding,Hai Huang,Chundu Wu
In this paper, degradation of ciprofloxacin (CIP) in a circulating dielectric barrier discharge (DBD) plasma system with Cu-CeO 2 @CA composite films addition was investigated. The Cu-CeO 2 @CA films were synthesized through hydrothermal method, and the samples were characterized by SEM , XRD, EDS, FT-IR and Raman spectra analysis. The obtained results show that there was synergistic effect of the DBD plasma and the Cu-CeO 2 @CA films on the CIP degradation and mineralization. The optimal performance was obtained under the condition of 5 wt% Cu-CeO 2 nanoparticles doping in the composite film. Besides the effect of the DBD plasma, the Cu-CeO 2 @CA films could drive the O 3 decomposition, photocatalysis and then the more reactive oxygen species (ROS) formation. The presence of the main active species and their contributions to the CIP degradation were determined by electron spin resonance (ESR) analysis and radical quenching experiments. Methods of UV–vis spectrum, three-dimensional fluorescence spectrum and liquid chromatography mass spectrometry (LC-MS) were used to analyze the CIP decomposition process. The prepared Cu-CeO 2 @CA composite films had certain stability in the four cycles of application and the film catalyst was convenient for recycling. The toxicity evaluation results indicated the decline of the solution toxicity after treating in the Cu-CeO 2 @CA/DBD system.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Environmental Science-Nano
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2018
·Vol. 5
·期 12
·2936-2944
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IF 6.087
Xiaoying Zheng,Dan Lu,Yuan Zhang,Wei Chen,Mengqi Jin,Xiaoyao Shao,Mengmeng Yang
The increasing use of cerium dioxide nanoparticles (CeO2 NPs) has raised concerns about their potential environmental toxicity. Denitrifying phosphorus removal-aerobic granular sludge (DPR-AGS) is a distinct form of microbial aggregates. In this study, the phosphorus removal efficiencies, the metabolic intermediates of polyhydroxyalkanoates (PHA) and glycogen, the enzyme activities of exophosphatase (PPX) and polyphosphate kinase (PPK), and the microbial community of DPR-AGS under long-term exposure to CeO2 NPs (0 (the control), 1, and 10 mg L−1) in anaerobic/oxic/anoxic (A/O/A) sequencing batch reactors (SBRs) were investigated. The results showed that chronic toxicity caused by 10 mg L−1 CeO2 NPs resulted in increased reactive oxygen species (ROS) production and lactate dehydrogenase (LDH) release, which reached 176.32% and 237.35%, respectively, when compared with the control (100%). High-throughput sequencing showed that denitrifying-phosphorus-accumulating organisms (DPAOs) were more sensitive to CeO2 NPs than phosphorus-accumulating organisms (PAOs), which was in accordance with phosphorus transformations during one cycle. However, the abundance of Dechloromonas and Defluviicoccus increased from 4.68% and 3.08% (R0) to 9.95% and 7.06% (R10), respectively, indicating that the tolerance of glycogen-accumulating organisms to CeO2 NPs was stronger than that of PAOs, which was consistent with the transformation of the metabolic pathway from polyphosphate accumulation (PAM) to glycogen accumulation (GAM).
研究领域:
环境科学
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微生物学
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DOI
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
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2017
·Vol. 93
·期 5
·1154-1164
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IF 2.121
Fengjun Zhang,Shuang Zou,Tianye Wang,Yuxi Shi,Peng Liu
CeO 2 /Bi 2 WO 6 heterostructured microsphere with excellent and stable photocatalytic activity for degradation tetracyclines was successfully synthesized via a facile solvothermal route. The photocatalytic experiments indicated that CeO 2 /Bi 2 WO 6 heterostructured microspheres exhibited enhanced photocatalytic activity compared to pure Bi 2 WO 6 in both the degradation of tetracycline hydrochloride (TCH) and rhodamine B (RhB) under visible-light irradiation. The 1CeO 2 /2Bi 2 WO 6 exhibited the best photocatalytic activity for degradation of TCH, reaching 91% after 60 min reaction. The results suggested that the particular morphological conformation of the microspheres resulted in smaller size and more uniform morphology so as to increase the specific surface area. Meanwhile, the heterojunction was formed by coupling CeO 2 and Bi 2 WO 6 in the as-prepared microspheres, so that the separation efficiency of photogenerated electrons and holes was dramatically improved and the lifetimes of charge carriers were prolonged. Hence, introduction of CeO 2 could significantly enhance the photocatalytic activity of CeO 2 /Bi 2 WO 6 heterostructured microspheres and facilitate the degradation of TCH. This work provided not only a principle method to synthesize CeO 2 /Bi 2 WO 6 with the excellent photocatalytic performance for actual produce, but also a excellent property of the photocatalyst for potential application in photocatalytic treatment of tetracyclines wastewater from pharmaceutical factory.
研究领域:
环境科学
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材料科学
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光催化技术
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Hongwang Liu,Yining Zhang,Sibao Liu,Sha Li,Guozhu Liu
Ammonia is a promising hydrogen storage material due to its ease of storage and decomposition to CO x -free hydrogen. Herein, we report colloidal solution combustion synthesis (CSCS) to construct Ni-CeO 2 nanocomposite catalysts for efficient ammonia decomposition to generate hydrogen. Unlike conventional supported Ni/CeO 2 catalyst, the prepared Ni-CeO 2 nanocomposite catalyst exhibited nickel embedded in CeO 2 matrix with enhanced metal-support interaction. The physicochemical properties and metal-support interaction of the catalysts can be tuned by adjusting the amount of silica sol template. The resulted Ni-CeO 2 nanocomposite catalysts exhibited outstanding catalytic performance in terms of activity and stability. The hydrogen production rate reached 32.9 mmol g cat −1 min −1 at 500 °C, which is superior to other state-of-the-art Ni-based catalysts and even comparable or better than some reported Ru-based catalysts. The systematic characterizations demonstrated that the unique Ni-CeO 2 nanocomposite structure with enhanced metal-support interaction, not only provided a rich Ni-CeO 2 interface to stabilize small-sized Ni nanoparticles, but also had a high concentration of oxygen vacancy to strengthen electronic metal-support interaction, making nickel surface electron-rich. The integrated studies of kinetics, temperature-programmed surface reaction, and DFT calculations corroborated that this enhanced metal-support interaction including geometric and electronic effects, favored the enrichment of NH 3 on the catalyst surface and facilitated rate-determining N≡N bond formation step, thereby boosting the reaction rate. This study highlights the importance of designing new structural catalysts with enhanced metal-support interaction for boosting hydrogen production from ammonia decomposition.
研究领域:
催化
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材料科学
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化学工程
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物理化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Shuang Li,Zhuo Liu,Lin Yang,Mengli Yan,Yan Xu
Oxygen vacancy defects on the surface of metal oxides can not only increase carrier density and facilitate electron transfer, but also increase more active sites, thereby significantly boosting the overall performance of sensors. In this study, a 3D bundle-like porous CeO 2 -SnO 2 heterostructure with abundant oxygen vacancy defects composed of radially cross-bundled mesoporous nanorods is successfully prepared. The synergistic effects of composition regulation, Ce 4+ /Ce 3+ valence engineering, and increased oxygen vacancy defects in the micro-nano structure enhance electron transfer at the interface, creating more active sites for triethylamine (TEA) capture. Consequently, the micro-nano structure shows an outstanding response value of 151.12 towards 100 ppm TEA at 157 °C, about six times higher than SnO 2 , with excellent selectivity, fast response/recovery times (9 s/123 s), superior anti-interference ability, and long-term stability. Also, the sensor can achieve a response value of 11.24 for TEA detection in gases from five-day-stored crucian carp at room temperature, showing potential for freshness monitoring. This work presents an effective strategy to develop TEA sensors for practical applications by using oxygen valence engineering and tailoring multi-scale pore structures in MOF-derived heterostructures.
研究领域:
材料科学
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传感器技术
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食品安全
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纳米科技
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表面化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Xiang-Yu Feng,Mao-Jin Ran,Man-Man Yuan,Mei-Tong Wei,Liang Wu,Zhi-Yi Hu,Li-Hua Chen,Yu Li,Bao-Lian Su
Li-rich Mn-based layered oxides with high specific capacity and operating voltages have become one of the most promising materials for lithium-ion batteries (LIBs). However, it still faces several issues of low initial Coulombic efficiency, poor electronic conductivity, and voltage fading due to oxygen release and transition metal rearrangement during cycling. In this study, Li1.2Mn0.54Ni0.13Co0.13O2 (LMR) cathode material with Na ion doping (LMNaR) and CeO2 nanoparticle surface modification (LMNaR@CeO2) is prepared to realize a synergistic modification effect. The doping of Na ions enlarges Li layer spacing to effectively promote the insertion and extraction of lithium ions, which makes the layered structure more stable to reduce the effect of the phase transition. And the CeO2 nanoparticle surface modification restrains the side reactions between electrode and electrolyte, stabilizes lattice oxygen, and eases oxygen release. As a result, LMNaR@CeO2 displays a specific capacity of 196 mAh g–1 after 100 cycles at 0.5 C with a capacity retention of 94% and a merely voltage decay of 0.16 V, which are much better than those of LMR with a specific capacity of 159.6 mAh g–1 and only a 79% capacity retention. Our strategy here provides a feasible approach for the development of Li-rich Mn-based cathode materials for long-lived LIBs.
研究领域:
材料科学
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能源存储技术
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Jiajia Lian,Pei Liu,Qingyun Liu
Realizing the high value-added utilization of cheap minerals in environmental catalysis has important practical significance. Herein, four nano-scale minerals, namely halloysite (Hal) nanotubes , palygorskite (Pal) nanorods , and montmorillonite (Mon) and hydrotalcite (LDH) nanosheets , were selected for in-situ supporting CeO 2 nanoparticles (NPs) by a facile one-pot hydrothermal method. Among various nanocomposites (NCs), CeO 2 /Pal behaves the highest peroxidase-like activity, attributing to larger surface area for uniformly dispersing CeO 2 NPs and more exposed active oxygen vacancy (O vac ) defects. A novel off-on colorimetric strategy was constructed for detecting toxic L -penicillamine (LPA) and Cu 2+ ion with limit of detections (LODs) of 8.37 and 9.80 μM, respectively. Density functional theory (DFT) calculations show that the O vac defect on CeO 2 (111) surface can catalyze the heterolytic cleavage of H 2 O 2 into H 2 O and oxygen radical (•O), instead of being two hydroxyl radicals (•OH) on clean surface. It can also act as trapping site for O 2 and H 2 O adsorption, improving the oxygen affinity and hydrophilicity of CeO 2 /Pal. This study provides a feasible strategy for designing mineral-based nanozymes and an insight into the possible catalytic mechanism.
研究领域:
环境催化
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材料科学
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生物分析化学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Xianghong Ren,Yizhi Zeng
Unsymmetrical dimethylhydrazine (UDMH), as a high-energy liquid rocket fuel widely used for space launches, inevitably produces huge volumes of UDMH wastewater during use. As UDMH and its byproducts are both highly toxic, this poses a major threat to the ecological environment and human body, making it an urgent need to develop an efficient, environmentally friendly treatment for UDMH wastewater. Photocatalysis is well recognized for being less costly and more environmentally friendly, yet as traditional photocatalysts are usually available in the form of powder, the photogenerated carriers cannot be well separated or effectively recycled. In this study, a composite photocatalyst featuring a three-dimensional core-shell array structure consisting of a TiO 2 crystal seed layer, a TiO 2 nanorod array core and a CeO 2 nanoparticle shell is created over the surface of recyclable carbon fiber by means of layer-by-layer loading. The TiO 2 rutile/anatase phase heterointerface and TiO 2 /CeO 2 heterointerface allow efficient separation and migration of photogenerated electrons and holes in the three-dimensional space. Under simulated solar irradiation, our new structure degrades 100 mg/L UDMH wastewater by up to 97.3 % within 240 min. More importantly, it shows good reusability and recyclability. Our research offers a practicable option for the efficient degradation of UDMH wastewater.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2024
·
IF 10.8
Hao Liu,Shan Yang,Jinxing Mi,Chuanzhi Sun,Jianjun Chen,Junhua Li
N2O and CO coexist in various industrial and mobile sources. The synergistic reaction of N2O and CO to generate N2 and CO2 has garnered significant research interest, but it remains extremely challenging. Herein, we constructed an atomically dispersed Rh-supported CeO2 catalyst with asymmetric Rh–O–Ce sites through gradient Rh 4d–O 2p–Ce 4f orbital coupling. This design effectively regulates the 4f electron states of Ce and promotes the electron filling of the O 3π* antibonding orbital to facilitate N–O bond cleavage. Near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) reveals that CO reacts with the surface-adsorbed O* generated by N2O decomposition through self-tandem catalysis, accelerating the rate-limiting step in N2O decomposition and activating the synergistic reaction of N2O and CO at temperatures as low as 115 °C. This work can guide the development of high-performance catalysts using the strategy of high-order orbital hybridization combined with the tandem concept to achieve versatile catalytic applications.
研究领域:
催化化学
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环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Jingyang Luo,Wangbei Cao,Wen Guo,Shiyu Fang,Wenxuan Huang,Feng Wang,Xiaoshi Cheng,Wei Du,Jiashun Cao,Qian Feng,Yang Wu
Various pollutants commonly co-exist in the waste active sludge (WAS), but the interactive effects and mechanisms of co-occurrence pollutants on the WAS treatment remain unclear. This work mainly investigated the impacts of different surfactants ( i.e., HTAB and SDBS) and CeO 2 nanoparticles (NPs) co-occurrence on the WAS fermentation for short-chain fatty acids (SCFAs) production, and found that the CeO 2 NPs coexisting with surfactants caused antagonistic effects on the SCFAs generation (10.7% and 33.9% inhibition by HTAB and SDBS , respectively). The surfactants and CeO 2 NPs co-occurrence restrained the solubilization , hydrolysis , and acidification steps simultaneously. Moreover, the functional hydrolytic-acidogenic bacterial ( e.g., Haliangium and Bacteroidetes sp. ) and the microbial metabolic networks involved in extracellular hydrolysis ( e.g., pepd and NEU1 ), substrate metabolism ( e.g., ALDO and asdA ), and fatty acid biosynthesis ( e.g. , aarC and pct ) were all downregulated by 4.3–53.8% in the reactors with surfactants and CeO 2 NPs co-occurrence. The presence of surfactants enhanced the dispersibility and stability of CeO 2 NPs and the Ce dissolution (1.5–3.0 times higher). Also, surfactants contributed to the WAS disintegration, which could improve the interactive chances of microorganisms entrapped in WAS and CeO 2 NPs by promoting the transportation channels, and therefore aggravated the toxicity towards anaerobic species.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Jun Li,Ge Gou,Hailing Zhao,Chao Liu,Naiwen Li,Longguo Li,Bo Tan,Bo Lai
CoFe 2 O 4 -CeO 2 composites with different CoFe 2 O 4 content were synthesized and used as catalysts for peroxymonosulfate (PMS) activation in water purification. Under the conditions of 200 mg/L 15%CoFe 2 O 4 -CeO 2 and 0.15 mM PMS, complete atrazine degradation was achieved in the 15%CoFe 2 O 4 -CeO 2 /PMS system. The pseudo-first-order rate constant ( k obs ) in 15%CoFe 2 O 4 -CeO 2 /PMS system (0.224 min −1 ) was 2.4 and 4.8 times of that in CoFe 2 O 4 /PMS system (0.092 min −1 ) and (CoFe 2 O 4 + CeO 2 )/PMS system (0.047 min −1 ). The main reactive species were verified through various quenching experiments and electron paramagnetic resonance tests, and the concentration of two main radicals was calculated. In addition, the interaction between CoFe 2 O 4 and CeO 2 involving Co(III)/Co(II), Fe(III)/Fe(II), and Ce(IV)/Ce(III) redox recycle for accelerating the degradation of organic compounds was explored. In addition, different from Cl − , HCO 3 − and NO 3 − , H 2 PO 4 − could promote atrazine degradation in 15%CoFe 2 O 4 -CeO 2 /PMS system by improving sulfate radical concentration in the reaction system. The main degradation intermediates of atrazine in the 15%CoFe 2 O 4 -CeO 2 /PMS and CoFe 2 O 4 /PMS systems were compared, as well as the degradation pathways. The toxicity analysis based on luminescent bacteria Vibrio fischeri indicated the superiority of 15%CoFe 2 O 4 -CeO 2 /PMS than CoFe 2 O 4 /PMS systems for ATZ degradation.
研究领域:
环境科学
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催化
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水处理
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Zhuwei Yang,Linsen Li,Xiao Yang,Hui Xiong,Riguang Zhang,Zhao Jiang
In this study, a series of Ni-CeO 2 /TS-1 (Titanium Silicalite-1) catalysts were synthesized for dry reforming of methane (DRM). Among them, 5Ni-10CeO 2 /TS-1 exhibited the highest catalytic performance with 89 % CH 4 and 93 % CO 2 conversions, 4.81 mol CH4 ·g Ni -1 ·h −1 and 4.99 mol CO2 ·g Ni -1 ·h −1 specific activities, 95.5 % H 2 /CO ratio after 50 h, accompanied by the good stability with 2.9 % CH 4 and 2.3 % CO 2 activity loss within 100 h. Combined with various characterizations, the structure–function relationship was also investigated. For the physical and morphological analysis, it was indicated that the appropriate CeO 2 content could effectively diminish, disperse the Ni nanoparticles, and maintain MFI backbone structure. For the electronic structure, the introduced CeO 2 could improve the amount and strength of the surface Ni-O-X (Ti or Ce) species by changing the interaction among Ni nanoparticles, TS-1 and CeO 2 . It led to more Ni nanoparticles in stronger electron-deficient state, as well as more medium-strength basic sites, favoring for the activation of CH 4 and CO 2 . However, Ni nanoparticles would be covered when excessive CeO 2 was introduced, preventing the exposure of the active sites. Therefore, only the suitable CeO 2 in the catalysts could significantly improve catalytic performance for DRM with long-term stability. Furthermore, the good anti-sintering and anti-coking properties of 5Ni-10CeO 2 /TS-1 were mainly dependent on the optimal amount of surface Ni-O-X species with high strength. In-situ DRIFTS (diffuse reflectance infrared spectroscopy) analysis demonstrated that the introduced CeO 2 could help catalyst favor for activating CH 4 and CO 2 molecules, and inhibiting the CH 4 overcracking and carbon accumulation, confirmed by the long-term measurement and structure analysis of spent catalysts.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）