JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2017
·Vol. 29
·期 3
·2282-2290
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IF 2.019
Zhao Gao-yu,Yang Shao-wei,Jiang Lin,Zhang Hong-mei
Novel Ag 10 Si 4 O 13 /N–CeO 2 composite photocatalysts were synthesized by a facile one-pot method. XRD, SEM, EDS, and UV–Vis DRS were employed to characterize the structures of the samples. Moreover, the degradation activity of methyl violet (MV) was used to measure the photocatalytic performances of Ag 10 Si 4 O 13 , N–CeO 2 , and the Ag 10 Si 4 O 13 /N–CeO 2 composites. It was found that ASO-10 (the Ag 10 Si 4 O 13 /N–CeO 2 composite with 10 mg N–CeO 2 ) showed the highest photocatalytic activity in the degradation of MV, and the enhanced photocatalytic performance is attributed to an improvement in the separation efficiency of photoproduced electron–hole pairs. Effects of operational parameters, such as initial pH, catalyst dosage, initial dye concentration, anions and cations, have also been considered for better practical applications. In addition, the photocatalytic mechanism of the Ag 10 Si 4 O 13 /N–CeO 2 composites is also proposed.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 12
·1025
·
IF 3.504
Dongping Xue,Yan Wang,Jianliang Cao,Zhanying Zhang
Developing the triethylamine sensor with excellent sensitivity and selectivity is important for detecting the triethylamine concentration change in the environment. In this work, flower-like CeO2-SnO2composites with different contents of CeO2were successfully synthesized by the one-step hydrothermal reaction. Some characterization methods were used to research the morphology and structure of the samples. Gas-sensing performance of the CeO2-SnO2gas sensor was also studied and the results show that the flower-like CeO2-SnO2composite showed an enhanced gas-sensing property to triethylamine compared to that of pure SnO2. The response value of the 5 wt.% CeO2content composite based sensor to 200 ppm triethylamine under the optimum working temperature (310 °C) is approximately 3.8 times higher than pure SnO2. In addition, CeO2-SnO2composite is also significantly more selective for triethylamine than pure SnO2and has better linearity over a wide range of triethylamine concentrations. The improved gas-sensing mechanism of the composites toward triethylamine was also carefully discussed.Keywords:CeO2-SnO2;nanostructure;hydrothermal;triethylamine;gas sensor
研究领域:
材料科学
·
化学工程
·
传感器技术
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
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2025
·
IF 6.3
Chenglin Zhang,Su Zhan,Feng Zhou
Addressing the issues of hazardous organisms and their facilitated diffusion is crucial for ensuring the long-term viability of maritime industries and safeguarding marine ecosystems. In this study, a p-n heterostructure scheme of CuBi 2 O 4 @CeO 2 photocatalysts was established by a facile wet chemical in-situ deposition for marine bacteria inactivation, experimental results demonstrate that the introduction of CeO 2 enhances overall bacterial sterilization efficacy, 15%CuBi 2 O 4 @CeO 2 exhibits the priority sterilization efficiency about 3.3, and 2.8 times to pure CeO 2 and pure CuBi 2 O 4 , respectively, and the inactivation effects of •OH is superior to the other mainstream active species. Moreover, incorporating CeO 2 film on the surface of CuBi 2 O 4 contributes to the selectively production of active species, shorten the electron transfer distance, and improves light response efficiency which derive from the innovative heterostructure design, a rational connection bridge between CeO 2 and CuBi 2 O 4 based on the band structure positioning, facilitates faster separation and transfer of photo-generated carriers while simultaneously suppressing charge carriers recombination. This paper offers an methodology and construction of harmless heterostructure photocatalysts for ballast water treatment and fosters a deeper understanding of the underlying photocatalytic mechanisms.
研究领域:
环境科学
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材料科学
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微生物学
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Zhongwei Meng,Zhongqiang Bao,Zhao Chen,Bosong Zeng,Zihan Qin,Jie Tan,Ping Pu
The regeneration characteristics of a diesel particulate filter (DPF) are studied on a regeneration test bench, with a focus on the effects of ash and catalyst, including the effects of ZnO and CeO 2 on the regeneration performance and emission characteristics of the DPF. The results indicate that the addition of ZnO and CeO 2 can easily lead to local high temperatures during the regeneration process of the DPF, with the highest peak temperature appearing in a 1:3 ratio for both ZnO and CeO 2 , leading to a significant increase in CO 2 . Compared with ZnO, CeO 2 can advance the DPF rapid regeneration period by about 300 s. When the ratio of PU: CeO 2 is 1:5, the total particulate matter emitted is reduced to the lowest level, but it will significantly increase the emission of nuclear model particles, especially particles below 23 nm. Under the same mixing ratio, an increase in carbon loading can enhance the oxidation ability of ZnO towards carbon black, but the difference between the number of particles emitted during DPF regeneration and regeneration efficiency will gradually decrease.
研究领域:
环境科学
·
能源工程
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Bowen Tan,Danru Xu,Mengmeng Jin,Bolun Yang,Zhun Hu,Jingjun Liu
Cerium dioxide (CeO2) with different morphologies was synthesized via a hydrothermal method and applied to the carbonylation of glycerol with CO2. Subsequent characterization through H2-TPR and catalytic activity tests demonstrated that CeO2 nanorods exhibited the highest oxygen storage/release capacity as well as enhanced catalytic performance compared to other morphologies. CeO2 nanorods were thus further modified through hydrogen reduction at varying temperatures, aiming to tune the density of the oxygen vacancies. Characterization via BET, NH3-TPD, CO2-TPD, XPS, and ESR indicated that variations in morphology and reduction temperature influenced the microstructural characteristics and the strength of the acid–base sites of the catalysts. Notably, hydrogen reduction created more oxygen vacancies in the CeO2 nanorods, with the concentration of these vacancies increasing with higher reduction temperatures. Furthermore, the catalytic activity of CeO2 in glycerol carbonylation with CO2 showed a positive correlation with the concentration of oxygen vacancies. Optimizing CeO2 catalysts can enhance its performance in activating CO2, providing new ideas for industrial CO2 resource utilization and carbon capture technology development.
研究领域:
催化化学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Ying-juan Hao,Yue-guang Ma,Xiao Zhang,Jianjun Li,Saifei Wang,Xuemin Chen,Fa-tang Li
Developing low-temperature, high-efficiency and anti-poisoning catalysts is crucial for VOCs removal. CeO 2 materials with different electron density are prepared via regulation on facets and oxygen vacancies. It reveals that high electron density of materials plays a decisive role in the production of reactive oxygen species, reducibility of surface lattice oxygen and improvement of photothermocatalytic activity for toluene oxidation compared with highly concentrated oxygen vacancies and large special surface area. Photothermocatalytic conversion rate for 1500 ppm of toluene over the optimized defective CeO 2 could reach 93 % at 145 °C under the gas hourly space velocity of 60,000 mL·g −1 ·h −1 . H 2 -TPR result shows that excessive oxygen vacancies are detrimental to the appearance of mobile reactive oxygen species due to the strong chemical interaction and the escape probability of surface lattice oxygen of CeO 2 . It is also found that the decrement of electron density of the recovered sample can account for the slight catalyst deactivation, accompanied by the increasement of bulk oxygen vacancies in the recovered sample, exclusive of disappearance of surface oxygen vacancies, aggregations and deposition of organic carbon. This work provides an insight into the design of high-efficiency non-noble catalysts applied to VOCs removal.
研究领域:
环境科学
·
催化材料
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DOI
高影响因子
ChemCatChem
·
2022
·Vol. 14
·期 13
·e202200253
·
IF 5.497
Mingsheng Luo,Tong Qin,Qinglong Liu,Zhi Yang,Fengli Wang,Hong Li
Graphical Promoting : A series of Fe-modified CeO 2 catalysts with nanoparticle, nanorod, nanocube and nano-octahedron morphologies were synthesized by the hydrothermal method. The Fe-modified CeO 2 nanorod catalysts exhibit a remarkably promoting effect on the formation of DMC from CO 2 and methanol. A series of Fe-modified CeO 2 catalysts with nanoparticle, nanorod, nanocube and nano-octahedron morphologies were synthesized and applied for direct synthesis of dimethyl carbonate (DMC) from CO 2 and methanol. The Fe-modification shows a remarkably promoting effect on the formation of DMC over Fe-modified CeO 2 nanorod. The DMC yield was improved from 0.202 to 2.568 mmol DMC per g cat by 2 %Fe-modification of CeO 2 nanorod. A synergistic effect among the moderate acid-basic sites, specific surface area and surface composition resulted from Fe-modification was proposed to be crucial to obtaining the high reactivity of DMC formation.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 17
·3811
·
IF 3.057
Zhiquan Huang,Leicheng Li,Zhiping Li,Huan Li,Jiaqi Wu
Herein, novel ternary kaolin/CeO2/g-C3N4composite was prepared by sol-gel method followed by hydrothermal treatment. The self-assembled 3D “sandwich” structure consisting of kaolin, CeO2and g-C3N4nanosheets, was systematically characterized by appropriate techniques to assess its physicochemical properties. In the prerequisite of visible-light irradiation, the removal efficiency of ciprofloxacin (CIP) over the kaolin/CeO2/g-C3N4composite was about 90% within 150 min, 2-folds higher than those of pristine CeO2and g-C3N4. The enhanced photocatalytic activity was attributed to the improved photo-induced charge separation efficiency and the large specific surface area, which was determined by electrochemical measurements and N2physisorption methods, respectively. The synergistic effect between the kaolin and CeO2/g-C3N4heterostructure improved the photocatalytic performance of the final solid. The trapping and electron paramagnetic resonance (EPR) experiments demonstrated that the hole (h+) and superoxide radicals (•O2−) played an important role in the photocatalytic process. The photocatalytic mechanism for CIP degradation was also proposed based on experimental results. The obtained results revealed that the kaolin/CeO2/g-C3N4composite is a promising solid catalyst for environmental remediation.Keywords:kaolin;CeO2;g-C3N4;visible-light irradiation;photocatalytic degradation
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Zhitong Zhou,Weixiang Guan,Xiaoli Pan,Aiqin Wang,Tao Zhang
One-pot amination coupling of vicinal diols toward the synthesis of pyrazines provides an efficient and economically viable route to access N-heterocycles from biomass, yet the current methodology relies on a fragile homogeneous catalyst system, which limits the sustainability of the chemistry. In this work, we developed a highly efficient heterogeneous catalyst 0.8Pt/13CeO2/Al2O3 which afforded diverse substituted pyrazines from readily available vicinal diols and ammonia with a yield up to 94% under mild reaction conditions and could be reused at least 6 times without obvious activity decay. Compared to the Pt/Al2O3 catalyst, the 0.8Pt/13CeO2/Al2O3 catalyst exhibited a 30-fold faster conversion rate of diols and an increased pyrazine selectivity from 48% to 79%. Characterizations revealed that doped CeO2 improved the dispersion of Pt, increased the electron density on the Pt sites, optimized the acid/basic property of the catalyst, and enhanced the adsorption strength and dehydrogenation ability of diols. All these features contributed to the increased activity and selectivity.
研究领域:
化学工程
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催化化学
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生物质利用
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Zixiang Su,Hehe Wei,Longtao Zhang,Hui Li,Ping Liu,Zhenshan Hou,Xueqing Gong
The electrocatalytic oxygen reduction reaction (ORR) is the key bottleneck of fuel cells and rechargeable metal-air batteries , and recently, metal nitrogen complex carbon (M N C) demonstrates great potential in these fields. However, the complex and easily degraded M N C structure often results in inferior activity and poor durability in electrolysis. Herein, we fabricate a catalyst of h-CeO 2 @CoNC through the extended Stöber method and subsequent pyrolysis , involving the hollow CeO 2 as the core and Co N C as the shell. The h-CeO 2 @CoNC catalyst exhibits notable ORR catalytic performances in 0.1 M KOH with a half-wave potential of 0.82 V and excellent durability, attributed to the synergistic interaction between CeO 2 and Co N C matrix. Specifically, the inner layer of CeO 2 is principally responsible for enhancing the chemical stability and the outer one of Co N C matrix is beneficial to boosting the ORR catalytic activity. This work provides an efficient preparation approach and further insight of rational design of the unique M N C catalysts for energy storage.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Fangyun Hu,Jianjun Chen,Yue Peng,Hua Song,Kezhi Li,Junhua Li
The catalytic oxidation of toluene has been investigated over pure CeO 2 hierarchical catalyst for the first time. The novel CeO 2 catalyst was prepared by a hydrothermal-driven assembly method. The structure of CeO 2 catalyst was consisted of nanowire self-assembled hierarchical microspheres. The new hierarchical CeO 2 catalyst showed much better catalytic activity than analogous nonporous catalyst by traditional hydrothermal method. The hierarchical CeO 2 catalyst could reach more than 90% toluene conversion even as low as 210 °C (T 90 ) under a high space velocity of 60,000 mL/(g·h). The high catalytic activities could be attributed to the large surface areas, in addition, the hierarchical porous structures provide more contents of surface oxygen vacancies for the dissociation of gaseous O 2 on the surface.
研究领域:
材料科学
·
环境催化
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Xuliang Pang,Huaiquan Zhao,Yifei Huang,Youchao Liu,Hongye Bai,Weiqiang Fan,Weidong Shi
Achievement of the intrinsic activity by in situ electrochemical reconstruction has been becoming a great challenge for designing a catalyst. Herein, an effective electrochemical strategy is proposed to reconstruct the surface of the CF–CuO/CeO2 precursor. Under the stimulation of oxidative/reductive potential, abundant active sites were successfully generated on the surface of CF–CuO/CeO2. Remarkably, the implantation of oxygen vacancy-rich CeO2 synergistically optimizes the chemical composition and electronic structure of CF–CuO/CeO2, greatly promoting the generation of active species. Systematic electrochemical experiments indicate that the superior catalytic performance of reconstructed CF–CuO/CeO2 could be attributed to CuOOH/CeO2 and Cu2O/Ce2O3 active species, respectively. The oxidative-/reductive-activated CF–CuO/CeO2 was further employed in a paired cell for the synergistic catalysis of hydroxymethylfurfural oxidation with 4-nitrophenol hydrogenation. As a result, nearly 100% Faraday efficiency for furandicarboxylic acid/4-aminophenol production was achieved in the paired system (−0.9 V vs Ag/AgCl, 1.5 h). Therefore, the electrochemical reconstruction via oxidative/reductive activation has been confirmed as a feasible approach to significantly excite the intrinsic activity of a catalyst.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）