FUEL
·
2022
·
IF 8.035
Shengji Wu,Yalun Ma,Wangsheng Yu,Hui Wang,Wei Yang,Lei Che,Zhongxi Han
How to enhance the SO 2 tolerance of transition metal oxide-supported activated carbon is one of the hottest issues in the field of mercury capture from flue gas. Addition of a foreign metal ion to prepare bimetallic adsorbent is a common method of improving the SO 2 tolerance of adsorbent. However, this approach suffers from high cost and a complex preparation process. In this study, CeO 2 - and Co 3 O 4 -supported activated carbon ( m %CeO 2 /AC and m %Co 3 O 4 /AC), with various loading values of active center, were prepared by an incipient wetness impregnation method, and their SO 2 tolerances were compared. The mercury removal performance and SO 2 tolerance of both CeO 2 /AC and Co 3 O 4 /AC could be remarkably improved through increasing the loading amount of the active center. Co 3 O 4 /AC exhibited high affinity with SO 2 , and the chemisorbed oxygen in Co 3 O 4 would be largely consumed, when SO 2 was present in the flue gas, resulting in a significant decrease of mercury removal efficiency. The mercury removal efficiencies of 20%CeO 2 /AC, 40%CeO 2 /AC and 60%CeO 2 /AC were 86.1%, 93.7% and 93.7%, respectively, during removal of mercury from flue gas at 150 °C in the presence of SO 2 . 20%CeO 2 /AC was the optimal adsorbent for mercury capture from flue gas, owing to its excellent mercury removal efficiency, strong SO 2 tolerance and relatively lower cost. The mercury species formed over spent 20%CeO 2 /AC were HgO and HgSO 4 . The HgO was generated through the reaction of mercury and chemisorbed oxygen, while the formation of HgSO 4 was due to the reaction between mercury, SO 2 and chemisorbed oxygen. The regeneration investigation indicated that the activity of spent 20%CeO 2 /AC could be almost fully recovered through a temperature-programmed decomposition and desorption process. The present study showed that the SO 2 tolerance of CeO 2 /AC could be easily improved through regulation of the loading amount of the active center.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Qiang Gao,Junxi Li,Bin Liu,Chenguang Liu
The rationally designed semiconductor photocatalytic materials have attracted significant attention because of their huge advantages in the use of solar light. Herein, a series of direct Z-scheme heterojunction nanocomposites were synthesized via in situ growth of zinc indium sulfide nanosheets on ceria nanosheets (ZnIn 2 S 4 @CeO 2 ) and employed for effective photodegradation and Cr(VI) reduction. Advanced characterizations such as XPS , EPR spectra, and DFT calculations verified that the formation of direct Z-scheme charges transfer mechanism promoted rapid charge separation and retained strong redox capacity. As a result, the optimized ZnIn 2 S 4 @CeO 2 sample showed significantly promoted photocatalytic removal rates for tetracycline (TC) and Cr(VI) at a 3.7 and 4.5 times enhancement by comparison with the pristine ZnIn 2 S 4 , respectively. Additionally, after four consecutive cyclic tests, the as-synthesized nanocomposite exhibited remarkable photocatalytic activity and stability. The present work provides an integrated engineering strategy for Z-scheme photocatalyst systems with high photocatalytic efficiency and extensive applications.
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高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 11
·1735-1750
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IF 11.534
Yang Weiyi,Wang Jian,Gao Shuang,Zhang Haoyu,Wang Hongyang,Li Qi
It is important to develop green and sustainable approaches to enhance electrochemical charge storage efficiencies. Herein, a two-step in-situ growth process was developed to fabricate carbon fiber paper-supported CeO 2 /MnO 2 composite (CeO 2 /MnO 2 —CFP) as a binder-free photo-electrode for the photo-assisted electrochemical charge storage. The formation of CeO 2 /MnO 2 type II heterojunction largely enhanced the separation efficiency of photo-generated charge carriers, resulting in a substantially enhanced photo-assisted charging capability of ∼20%. Furthermore, it retained a large part of its photo-enhanced capacitance (∼56%) in dark even after the illumination was off for 12 h, which could be attributed to its slow release of stored photo-generated electrons from its specific band structure to avoid their reaction with O 2 in dark. This study proposed the design principles for supercapacitors with both the photo-assisted charging capability and its long-lasting retainment in dark, which may be readily applied to other pseudocapacitive materials to better utilize solar energy.
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高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Luyao Zhang,Fuli Tian,Huan Li,Jiangman Meng,Qi Liu,Xiaoqian Guo,Yun Qiu,Jun Zhang,Changyan Li
A series of non-enzymatic graphene functionalized biosensors was developed via deposition precipitation method for lactic acid (LA) detection, which were characterized by transmission electron microscopy (TEM), Raman spectroscopy , X-ray photoelectron spectroscopy (XPS), gas chromatography-mass spectrometry, liquid chromatography-mass spectrometry, and proton nuclear magnetic resonance ( 1 H NMR). The electrochemical performances of the non-enzymatic biosensors were measured by means of the electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) method. The comprehensive analysis of structures shows that Pt, CeO 2 , and GO components interact with each other. During the storing and releasing oxygen, the valence ratio of Ce 3+ /Ce 4+ and the number of oxygen vacancies in CeO 2 change accordingly, which can be conducive to increasing electronic transmission capacity and finally leads to the improvement of electrocatalytic performance. Among them, the Pt/CeO 2 /GO biosensor containing 0.47 at% platinum exhibits an excellent electrochemical detection performance with high sensitivity of 12.3 µA·L/ (mmol·cm 2 ) and a low limit of detection (LOD) of 5.12 μmol/L in a wide linear range from 10 to 900 μmol/L. In addition, the proposed biosensor possesses a promising anti-interference capability, as well as high stability and good reproducibility, which was assessed by testing the cyclic voltammogram in 0.1 mol/L lactic acid one year later. The underlying mechanism was proposed for electrochemical oxidation of LA to carbon dioxide and acetic acid with the synergistic effect among Pt, CeO 2 , and GO. Furthermore, the results of the standard addition method in real samples (human serum and urine samples) reveal that the lactic acid detection of the non-enzymatic Pt/CeO 2 /GO biosensor is accompanied by high reliability. Thus, it will be a valuable biosensor for in vitro detection of lactic acid level in clinical samples.
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高影响因子
ACS Omega
·
2022
·
IF 4.132
Xiaofeng Li,Xiaohui Liu,Jiamao Hao,Lijun Li,Yanfang Gao,Yousong Gu,Zhenzhu Cao,Jinrong Liu
A strong metal–support interaction (SMSI) type catalyst has been synthesized and applied to a molten hydroxide direct carbon fuel cell (MHDCFC) to enhance the reaction activity of the anode carbon fuel through the interaction between the metal Ni and the support CeO2. Two catalysts have been prepared by a direct precipitation method (denoted NiO@CeO2) and a hydrothermal method (denoted NiO-CeO2), which are reduced by H2 to obtain Ni@CeO2 and Ni-CeO2, respectively. X-ray photoelectron spectroscopy (XPS), Raman, and temperature-programmed hydrogen reduction (H2-TPR) analysis results show that there are obvious oxygen vacancies and a Ni-O-Ce interface structure in NiO-CeO2 and Ni-CeO2, which is induced by the interaction between Ni and CeO2. The calculation results of current density and power density show that the performance of the MHDCFC is significantly improved in the presence of Ni-CeO2. The function fitting curves of the logarithm of the reaction rate constant (ln k) and the reciprocal of the temperature (1/T) show that the slope of the curve is decreased significantly after the addition of Ni-CeO2. In combination with density functional theory (DFT), the anode carbon reaction path is simulated in the MHDCFC, and the calculation results show that the reaction energy for the anodic carbon to generate carbon dioxide is decreased by 1.03 eV in the presence of Ni-CeO2.
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DOI
PubMed
高影响因子
BIOCONJUGATE CHEMISTRY
·
2021
·
IF 4.774
Chaoqun Cheng,Yuan Cheng,Sheng Zhao,Quan Wang,Sirong Li,Xiwen Chen,Xiaohan Yang,Hui Wei
Nanozymes are nanomaterials with enzyme-like activities, which have been developed for inflammatory disease therapy by reactive oxygen species (ROS) scavenging. The application of nanozymes in ulcerative colitis (UC) treatment not only inherits the merits of small molecular antioxidants (e.g., 5-aminosalicylic acid) to scavenge ROS but also achieves catalytic recycle instead of stoichiometric consumption. However, current therapies usually ignore the repair of mucosa, the first line of defense, whose damage increases the risk of infections. Herein, a multifunctional nanozyme hydrogel is designed and verified both as an ROS scavenger and a mucosal healing enhancer for UC therapy. The chitosan-coated CeO2 nanozyme (CCNZ) not only possesses excellent ROS-scavenging ability but also exhibits satisfactory antibacterial capacity. After gelation with alginate, the optimized CCNZ1:Alg1.5 nanozyme hydrogel exhibits multiple functions, including inflamed site targeting, supporting cell growth, ROS scavenging, and antibacterial activity, which alleviates UC better than a clinical medication 5-aminosalicylic acid by even a single-dose treatment. This study reveals that a nanozyme providing mucosal healing is promising for UC therapy with excellent potential for clinical application and enriches the nanozyme research of treatment for diseases.
研究领域:
纳米技术
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生物医学工程
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药学
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炎症性肠病
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DOI
PubMed
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Fanhui Liao,Yanchang Chu,Donghai Xu,Le Yang
Co/CeO2 catalysts with different morphologies of polyhedrons (Co/CeO2–P), rods (Co/CeO2–R), sheets (Co/CeO2–S) and cubes (Co/CeO2–C) were prepared and compared on the catalytic upgrading of hydrothermal liquefied (HTL) biocrude derived from municipal sewage sludge (MSS) to biofuel. The best quality biofuel was achieved on Co/CeO2–C with a higher heating value (HHV) of 39.10 MJ/kg, where the sulfur and oxygen contents were reduced to 0.007 and 9.19 wt %, while the carbon and hydrogen contents were elevated to 77.5 and 10.1 wt %, respectively. In contrast, the pure ceria support presented a slight improvement for the upgrading of biocrude. Overall, this work provides a feasible solution for high-value utilization of MSS to produce high-grade biofuel.
研究领域:
环境科学
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化学工程
·
能源技术
·
催化
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yunhe Li,Xiubo Min,Yilin Wei,Peiyuan Liang,Yixuan Yu,Tianjun Sun
Zeolite-based catalysts are extensively investigated for industrial applications due to their unique pore structure, remarkable thermal/hydrothermal stability, and abundant acid sites. However, the inherent lack of active sites for oxygen activation in non-reducible supports leads to suboptimal low-temperature oxidation activity. This study synthesized SSZ-39 (AEI-type) zeolite via interzeolite transformation from Y (FAU-type) zeolite, exploring the effects of gel composition on its structural properties and the influence of different cerium precursor salts on the CO oxidation performance of platinum-loaded zeolite catalysts. The results show that introducing seed crystals can replace 40 % of the organic structure-directing agent, leading to the synthesis of pure SSZ-39 zeolite with a specific surface area of 588 m 2 /g, where aluminum species are solely present as framework aluminum. The Pt-8Ce(ca)/SSZ-39 catalyst, prepared using cerium acetate as the precursor, demonstrates excellent low-temperature activity and stability, achieving 100 % CO conversion at 150 °C and maintaining it for over 100 h. After hydrothermal aging at 750 °C, the conversion temperature increased by only 20 °C, with the outstanding hydrothermal stability attributed to the stable framework structure of SSZ-39 zeolite. The highly dispersed Pt-CeO 2 interface increases surface-active oxygen species, which induce the transition from the L-H to the MvK reaction mechanism. This reduces competitive adsorption between O 2 and CO, and the oxygen vacancies formed during the reaction serve as additional O 2 activation sites, addressing the low-temperature CO oxidation issue in non-reducible support zeolite-based catalysts.
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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环境科学
·
无机化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yuehua Liu,Qiang Xue,Chunwen Chang,Rong Wang,Qun Wang,Xiaohan Shan
A novel laser-induced graphene (LIG) electrode modified with SnO 2 and CeO 2 nanoparticles (NPs) was created to detect Cd(II) ions via differential pulsed anodic stripping voltammetry (DPASV). Transmission electron microscopy (TEM), scanning electron microscopy (SEM), infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), and contact angle (CA) analyses were used to characterize the physical and electrochemical properties of the electrode. Both the electrochemical activity and adsorption capacity of the carbon electrode were significantly enhanced. Due to the synergistic effects of SnO 2 and CeO 2 NPs, the modification enhanced the transfer of free electrons on the electrode surface, increasing the electrode sensitivity and accelerating the response speed in the detection process. The use of poly-aminobenzene sulfonic acid (p-ABSA) further increased the conductivity of the electrode. The enhanced adsorption energy and electron transfer properties of the modified electrode were also substantiated by density functional theory (DFT) calculations. Parameters such as Sn/Ce ratio, deposition time, number of polymerization cycles of p-ABSA and solution pH were optimized to determine the best detection conditions for Cd(II) ions. Under optimal conditions, our sensor showed a broad linear concentration range (0.1 ∼ 160 μg/L) with a low detection limit (0.01 μg/L). This sensor was also successfully applied for detection of Cd(II) ions in groundwater and tap water. Recovery rates ranged from 94 to 111% with a relative standard deviation (RSD) less than 6.06%. This sensor has good anti-interference ability, reproducibility and stability. Our results provide a promising sensor technique for efficient and rapid in situ monitoring of Cd(II) ions in aquatic environments.
研究领域:
环境科学
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材料科学
·
分析化学
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jinlong Cui,Chengui Zhang,Yalong Li,Yang Liu,Weijun Jiang,Yuhui Wen,Zhenxi Wang,Zhonghua Yu,Xiangrong Ren,Zhifu Zhang
The selective hydrogenation of cinnamaldehyde (CAL) is a key reaction for producing valuable intermediates in pharmaceuticals, fragrances, and fine chemicals. However, achieving high selectivity toward the C=O bond reduction of CAL under mild conditions remains challenging. In this study, an efficient and sustainable photocatalytic strategy for the selective transfer hydrogenation of cinnamaldehyde to cinnamyl alcohol under mild conditions was reported. The low-loading 0.5 wt% Au/TiO 2 -CeO 2 and 0.5 wt% Pt/TiO 2 -CeO 2 catalysts were prepared by sol–gel and ultraviolet deposition method. Experimental results show that heterojunction is formed by doping CeO 2 with TiO 2 . The light absorption of materials is redshifted, and the separation of photogenerated electron-hole pairs is enhanced, thereby reducing the load usage of precious metal. The 0.5 wt% Au/TiO 2 -CeO 2 catalyst exhibits optimal performance under visible light irradiation, while the 0.5 wt% Pt/TiO 2 -CeO 2 catalyst exhibits excellent activity under ultraviolet light irradiation. The conversion efficiency in 0.5 wt% Au/TiO 2 -CeO 2 catalytic system under visible light is 97.23 %, and the selectivity can reach 96.91 %. Recycling tests verified the structural stability and reusability of the prepared catalysts. The formation of heterojunction structures can effectively reduce the load of precious metal while maintaining high conversion and selectivity. These findings provide a new pathway for achieving highly selective CAL hydrogenation under mild conditions.
研究领域:
催化化学
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材料科学
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光催化
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绿色化学
·
化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Haiyang Zhang,Xiujuan Ma,Hongyan Zhang
A CeO 2 /Zn 2 SnO 4 ammonia (NH 3 ) sensor with excellent sensing performance was prepared by a one-step hydrothermal method, and the effect of surface oxygen vacancies on the performance of the sensor was analyzed by density functional theory (DFT). Experimental results show that the construction of CeO 2 /Zn 2 SnO 4 heterojunction can improves the content of oxygen vacancies on the surface of Zn 2 SnO 4 , which provides more adsorption active sites for NH 3 molecules and effectively improves the gas sensing performance of the sensor. DFT results indicate that surface oxygen vacancies facilitate the charge transfer caused by the adsorption of NH 3 molecules by CeO 2 , thereby increasing the binding energy of NH 3 molecules. Additionally, the surface oxygen vacancies can cause the structure of Zn 2 SnO 4 to deform during the adsorption of NH 3 , leading to significant electron hybridization and thereby increasing the binding energy of NH 3 molecules. In addition, CeO 2 /Zn 2 SnO 4 sensor was successfully applied to detect the NH 3 gas concentration released by different levels of freshness of beef, providing an effective method for monitoring the freshness of high-protein foods.
研究领域:
材料科学
·
气体传感器
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食品质量监测
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纳米材料
·
表面化学
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DOI
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Fang Huang,Aihao Xu,Xiangyu Chen,Huanhuan Sun,Siyu He,Dong Wei,Boran Wang,Anxiang Guan,Xucai Yin,Jing Xu,Huibing He
The direct electrocatalytic conversion of carbon dioxide to methane using water as a medium is a reliable way to store intermittent renewable energy and solve environmental problems. However, in such multielectron/proton transfer reactions, the role of water is often overlooked. Specifically, the sluggish kinetics of water dissociation limit the effective proton supply during methane formation. Here, we propose a copper-doped CeO2 catalyst with frustrated Lewis pairs (FLPs), which can effectively reduce carbon dioxide to methane. Combined experimental analysis and theoretical calculations reveal that the synergistic interaction between Cu and FLPs forms an f-p-d gradient orbital coupling system, which significantly promotes water dissociation to generate active protons and optimizes the adsorption behavior of the *H and *COOH intermediates. Even at the large current density of −273 mA cm–2, the Faraday efficiency of Cu/CeO2-FLPs for methane was as high as 78.0%, with a conversion frequency of 15784.1 h–1 in the flow cell. This work provides a strategy for the rational design of efficient multipoint catalytic systems.
研究领域:
催化化学
·
电化学
·
材料科学
·
可再生能源
·
环境科学
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高影响因子
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