ACS Catalysis
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2020
·
IF 12.35
Qingsong Zhang,Jiahao Bu,Jiandian Wang,Changyong Sun,Dongyang Zhao,Guangzhe Sheng,Xiaowei Xie,Ming Sun,Lin Yu
Pt/CeO2 catalysts with different support shapes and prereduction temperatures were prepared and tested in the liquid-phase hydrogenation of nitrobenzene. Detailed characterizations reveal that the support shape effect of Pt/CeO2 catalysts on nitrobenzene hydrogenation originates from the exposed crystal planes on CeO2 with different reducibilities. A high-energy surface is readily reduced to generate more Ce3+ surface sites and oxygen vacancies, not only favoring the dispersion and stabilization of Pt species due to stronger metal–support interaction but also providing more adsorption sites for reactants and intermediates. Reduction treatment at high temperatures has been proved to be an effective way to improve the performance of Pt/CeO2 catalysts by providing additional Ce3+ surface sites and high H-spillover capability. The additional Ce3+ far away from Pt, derived from a high-temperature reduction, can adsorb the N-phenylhydroxylamine intermediate more effectively due to its stronger electron-donating ability and in turn promote aniline formation. It is also found that Na ions with suitable content facilitate the generation and stabilization of surface Ce3+ by charge transfer and help Pt particles to maintain a smaller size. Consequently, a 0.25 wt % Pt catalyst, supported on Na-containing CeO2 nanorods and reduced at 600 °C, displays a high level of aniline productivity of 40.8 molAN/gPt/h and excellent stability in nitrobenzene hydrogenation at room temperature. A pathway of nitrobenzene hydrogenation catalyzed by Pt/CeO2 is also proposed.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 25
·期 2
·169-184
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IF 0
Li Yingxia,Li Jiaxin,Yang Xiao,Wang Xitao,Xu Yanhong,Zhang Lihong
A series of PtCuCeMgAl quintuple hydrotalcite-like compounds with different Ce contents were synthesized by one-pot method. After calcining and reduction, CeO 2 -modified Mg(Al)O-supported Pt–Cu alloy catalysts were obtained. To understand the effect of Cu and Ce, the structure and physico-chemistry properties of the catalysts were characterized and analyzed, and the catalytic behaviors were investigated in a direct dehydrogenation of propane to propene. The results show that the Pt 4+ , Cu 2+ , and Ce 3+ ions can be incorporated into the brucite-like layers and the Ce content significantly affects the interaction strength between Pt and Cu and the dehydrogenation performance of propane. Under the reaction conditions, the highest propane conversion (45%) with 89% selectivity to propene and a 40% propene yield were achieved with a 0.3 wt% Ce-modified PtCu/Mg(Al)O catalyst. The improved catalytic performance is related to the easy formation of Pt–Cu alloy phase, excellent resistance to sintering, and coke deposits of active components modified by CeO 2 .
研究领域:
催化化学
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材料科学
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DOI
JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Huiyu Liang,Ke Xiao,Liyan Wei,Bo Yang,Gang Yu,Shubo Deng,Huabo Duan,Caizhen Zhu,Juying Li,Junmin Zhang
A novel CuO-CeO 2 -CoO x nanocatalyst was prepared for heterogeneous Fenton-like reaction to break the Ni 2+ -chelate into free Ni 2+ in electroless nickel plating wastewater, followed by separation of Ni 2+ in an insoluble form. The composite nanocatalysts prepared by co-precipitation method were characterized by XRD, TEM, and XPS, et al. Its catalytic activity as Fenton-like reagent was evaluated by the removal efficiency of Ni(II)-citrate after decomplexation and postprecipitation treatment. Subsequently, the effects of operating parameters on the decomplexation efficiency of the nanocatalysts were investigated including calcination temperature of catalysts, H 2 O 2 concentration, catalyst dosage, initial pH and reaction temperature. Under optimized condition, the Ni(II)-citrate complexes ( C 0 = 1.0 mM) achieved the complete decomplexation (>99.9%) within 60-min reaction using 0.3 g/L of CuO-CeO 2 -CoO x calcined at 450 °C and 75 mM of H 2 O 2 at pH 3.0 under 50 °C of reaction. Then, Ni 2+ after decomplexation could be completely removed by the subsequent precipitation at pH 11.0. In addition, the life test of CuO-CeO 2 -CoO x catalyst indicated that, after recycled 10 times, its activity for decomplexation of Ni(II)-citrate decreased no more than 8%. As a result, this new heterogeneous Fenton-like process is promising for decomplexation and purification of electroless nickel plating wastewater as a sludge reduction technology.
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
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Min Zhang,Xue Zhao,Yunyuan Dong,Chenyao Hu,Xiaokang Xiang,Xiantao Zeng,Junhao Jia,Chen Jin,Liang Ding,Xiaobin Chen
The development of green and efficient photocatalytic materials for the treatment of medical and industrial wastewater has become a current research focus. In this work, the CeO 2 /Zn 0.4 Cd 0.6 S heterojunction with a special 0D/1D morphology was synthesized by a soft chemistry method. The successful construction of the heterojunction was verified by the binding energy migration of XPS and TEM . The photocatalytic activities were determined by photoreduction of hexavalent chromium ions (Cr VI ) and photodegradation of tetracycline hydrochloride (TC). The experimental results showed that the loading of CeO 2 significantly improves the photocatalytic performance of Zn 0.4 Cd 0.6 S, and the loading of 10 wt% CeO 2 has the best photocatalytic activity and structural stability. The S-scheme electron transport mechanism was particularly investigated through active species trapping experiments. This work provides an effective idea for the design of highly stable metal sulfide photocatalysts .
研究领域:
环境科学
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材料科学
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化学
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纳米技术
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·Vol. 30
·期 27
·70731-70741
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IF 5.8
Lin Ruixi,Li Jiarong,Jing Xuequan,Guo Meina,Ren Guoqing,Qin Haonan,Yao Zhangwei,Wan Yinhua,Song Weijie,Zeng Huifeng,Yang Feifei,Zhao Da,Hu Kang
Adsorption of vanadium from wastewater defends the environment from toxic ions and contributes to recover the valuable metal. However, it is still challenging for the separation of vanadium (V 5+ ) and chromium (Cr 6+ ) because of their similar properties. Herein, a kind of CeO 2 nanorod containing oxygen vacancies is facilely synthesized which displays ultra-high selectivity of V 5+ against various competitive ions (i.e., Fe, Mn, Cr, Ni, Cu, Zn, Ga, Cd, Ba, Pb, Mg, Be, and Co). Moreover, a large separation factor ( SF V/Cr ) of 114,169.14 for the selectivity of V 5+ is achieved at the Cr 6+ /V 5+ ratio of 80 with the trace amount of V 5+ (~ 1 mg/L). The results show that the process of V 5+ uptake is the monolayer homogeneous adsorption and is controlled by external and intraparticle diffusions. In addition, it also shows that V 5+ is reduced to V 3+ and V 4+ and then formation of V–O complexation. This work offers a novel CeO 2 nanorod material for efficient separation of V 5+ and Cr 6+ and also clarifies the mechanism of the V 5+ adsorption on the CeO 2 surface.
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
PubMed
高影响因子
ACS Engineering Au
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2022
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IF 0
Huanhao Chen,Wei Guo,Xiaolei Fan
Non-thermal plasma (NTP) catalysis is a promising technology for CO2 valorization with renewable H2, in which catalyst design is one of the key aspects to progress the hybrid technology. Herein, bimetallic NiCo supported on CeO2 catalysts, that is, NiCo/CeO2, were developed with less metal loading of ∼2 wt % using mechanochemical synthesis for NTP-catalytic CO2 methanation. During the synthesis, different addition orders of Ni and Co precursors were investigated, and the results show that the NiCo1/CeO2-I catalyst (which was prepared by the simultaneous addition of Ni and Co precursors, protocol I) exhibited the highest CO2 conversion (∼60%) and CH4 selectivity/yield (∼80%/∼50%), whereas the NiCo1/CeO2-II and NiCo1/CeO2-III catalysts (prepared by sequential addition protocols of II and III) showed very poor catalytic performance. Characterization results suggested that in protocol I, Ni and Co prefer to alloy, and concentrated oxygen vacancies on the CeO2 surface and high surface basicity are retained as well. Such properties of NiCo1/CeO2-I were responsible for CO2 activation and hydrogenation under NTP conditions, which was explained by the proposed mechanisms.
研究领域:
化学工程
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环境科学
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材料科学
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DOI
ELECTROCHIMICA ACTA
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2018
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IF 5.116
Fumei Zuo,Cong Zhang,Han Zhang,Xingrong Tan,Shihong Chen,Ruo Yuan
A solid-state electrochemiluminescence (ECL) biosensor for the detection of concanavalin A (Con A) was constructed using graphene quantum dots (GQDs) as luminophore, which were loaded on polyamidoamine (PAMAM) functionalized CeO 2 @Ag NPs by the interaction between the NH 2 of PAMAM and the COOH of GQDs. The electrodepositing gold layers were used as matrix to immobilize glucose oxidase (GOx). GOx served as recognition elements to further capture Con A by the specific interaction between carbohydrate and Con A. With the increase of the concentration of Con A, the amount of GOx-CeO 2 @Ag-GQDs incubated onto the electrode was increased and a higher ECL signal was obtained. The constructed biosensor exhibited a sensitive response towards Con A and a low detection limit of 0.16 pg/mL was obtained. Such a construction strategy provides a new approach for applying GQDs to establish a solid-state ECL biosensor.
研究领域:
生物传感
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分析化学
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产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2015
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IF 6.409
Yicheng Wei,Yan Li,Na Li,Yong Zhang,Tao Yan,Hongmin Ma,Qin Wei
In the present work, an ultrasensitive sandwich-type electrochemical immunosensor based on a novel signal amplification strategy was designed for quantitative detection of alpha fetoprotein (AFP). Au nanoparticles with biocompatibility were electrodeposited on the surface of glassy carbon electrode (GCE) which can effectively capture and immobilize primary anti-AFP (Ab 1 ) to significantly amplify the electrochemical signal. Graphene Oxide and CeO 2 mesoporous nanocomposite functionalized by the 3-aminopropyltriethoxysilane supported Pd octahedral nanoparticles (Pd/APTES-M-CeO 2 -GS) were utilized as labels of detection anti-AFP (Ab 2 ). Pd octahedral nanoparticles presented good catalytic activity towards the reduction of H 2 O 2 . Due to the large specific surface area and good adsorption properties of APTES-CeO 2 -GS nanocomposite, large amount of Pd octahedral nanoparticles could be immobilized, which could amplify the electrochemical signal and improve the sensitivity of the immunosensor. Under optimal conditions, the immunosensor exhibited wide linear range from 0.1 pg/mL to 50 ng/mL with a low detection limit of 0.033 pg/mL ( S / N =3) for AFP detection. In addition, high sensitivity, excellent selectivity, good reproducibility and stability were obtained for the immunosensor, which has a promising application for quantitative detection of other tumor markers in clinical diagnosis.
研究领域:
生物医学工程
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肿瘤标志物检测
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纳米技术应用
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 2
·1-7
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IF 6.232
Wang Jiawei,Ni Pengjuan,Chen Chuanxia,Jiang Yuanyuan,Zhang Chenghui,Wang Bo,Cao Bingqiang,Lu Yizhong
Core-shell palladium cube@CeO 2 (Pd cube@CeO 2 ) nanoparticles are shown to display oxidase-like activity. This is exploited in a method for determination of the activity of alkaline phosphatase (ALP). The Pd cube@CeO 2 nanoparticles were thermally synthesized from Ce(NO 3 ) 3 , L-arginine and preformed Pd cube seeds in water. The Pd cube@CeO 2 nanoparticles catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by oxygen. This results in the formation of oxidized TMB (oxTMB) with an absorption peak at 652 nm. Ascorbic acid (AA) is generated from the hydrolysis of L-ascorbic acid 2-phosphate (AAP) catalyzed by ALP. It can reduce oxTMB to TMB, and this results in a decrease of the absorbance. The method allows for quantitative determination of the activity of ALP in the range from 0.1 to 4.0 U·L −1 and with a detection limit down to 0.07 U·L −1 . Endowed with high sensitivity and selectivity, the assay can quantify ALP activity in biological system with satisfactory results.
Schematic illustration of Pd cube@CeO 2 core-shell nanoparticles for colorimetric determination of alkaline phosphatase.
研究领域:
生物化学
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纳米医学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2020
·
IF 4.333
Xin Zong,Jie Zhang,Jinqiu Zhang,Wen Luo,Andreas Züttel,Yueping Xiong
The electrochemical reduction of carbon dioxide (CO 2 RR) has attracted enormous interest because of the energy crisis and climate change; however, more efficient catalysts are required for practical applications. Herein, we present electrospinning as a facile strategy to synthesize a three-dimensional network of carbon nanofibers embedded with Cu and CeO x nanoparticles (Cu/CeO x @CNFs) as a CO 2 RR catalyst. The Cu–CeO x interface produced using this method offers synergistic geometric and electronic effects which optimize the adsorption strength of reaction intermediates for the electroreduction of CO 2 to CO. In a flow cell configuration, a current density of 100 mA cm −2 and a CO faradaic efficiency of 59.2% can be obtained at −0.60 V vs. RHE.
研究领域:
电化学
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材料科学
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催化
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纳米技术
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能源转换
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产品关联
DOI
高影响因子
ChemCatChem
·
2020
·Vol. 13
·期 3
·924-933
·
IF 4.853
Jingjing Song,Fabao Zhang,Qingzhuo Hu,Wei Jiang,Dongdong Li,Bo Zhang
Graphical Dual catalysis : A dual functional CeO 2 /Cu 2 O/CuO nanocomposite was synthesized by a facile chemical method using Ce-based Ce-Al-Cu glass ribbons as a precursor. The nanocomposite can rapidly degrade azo dyes including orange II (OII), methyl orange (MO), and congo red (CR) under dark conditions with no chemical and energy input. Under visible light irradiation, the composite also showed high efficiency for the decomposition azo-free dyestuff such as methylene blue (MB) and rhodamine B (RhB). A novel dual functional CeO 2 /Cu 2 O/CuO nanocomposite was synthesized by a facile chemical method using Ce-based Ce-Al-Cu glass ribbons as a precursor. The nanocomposite can rapidly degrade azo dyes including orange II (OII), methyl orange (MO), and congo red (CR) under dark conditions with no chemical and energy input. Under visible light irradiation, the composite also showed high efficiency for the decomposition azo-free dyes such as methylene blue (MB) and rhodamine B (RhB). The excellent performances of the nanocomposite in both dark and light conditions are attributed to the synergistic effects of its composition and the nanoparticle structure that have large surface areas and contain many active sites, and to the formation of heterojunctions in the Ce/Cu Oxide. The high performance of this bi-functional catalyst made from industrially-prepared atomically homogenous amorphous metallic demonstrates the promise of high-performance catalysts based on multi-component metallic glass materials.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Qi Zhang,Qian Ma,Xueying Wang,Yi Wang,Dongheng Zhao
In the present work, a series of CeO 2 /WO 2.9 composites with a tunable structure and thickness are originally fabricated by innovating different additional quantities of H 2 WO 4 during the hydrothermal process. Optimal Ce/W-0.25 sensors have a higher response value of 23.68 to 100 ppm n -butanol at room temperature than that of pure CeO 2 (1.26) at 200 ℃. The unique surface double oxygen defect engineering between CeO 2 and WO 2.9 has a remarkable role in enhanced gas sensing, formation of the CeO 2 -WO 2.9 heterojunction, and effective surface/interface transport mechanism. The electron transfer between WO 2.9 and CeO 2 driven by oxygen defects on the surface of CeO 2 can easily facilitate the interconversion between Ce 3+ and Ce 4+ . This work provides a new insight and the facile fabrication pathway for constructing double oxygen defects-derived CeO 2 -based heterostructures for developing novel n -butanol gas sensors with excellent sensing performance at room temperature.
研究领域:
材料科学
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化学工程
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纳米技术
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传感器与执行器
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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）