CHEMOSPHERE
·
2019
·
IF 5.108
Zhendong Li,Dongfang Liu,Yingxin Zhao,Songrong Li,Xiaocheng Wei,Fansheng Meng,Wenli Huang,Zhongfang Lei
In this study, CuO-CeO 2 was synthesized via an easy hydrothermal-calcination method and innovatively applied to peroxymonosulfate (PMS) activation for pollutants degradation under a non-radical oxidation pathway. Singlet oxygen ( 1 O 2 ) was the dominated reactive oxygen species in the CuO-CeO 2 /PMS system, leading to a dramatical degradation efficiency with Rhodamine B (RhB) as model compounds. The observed rate constant of the CuO-CeO 2 /PMS system was 7–11 times higher than that of only PMS , CeO 2 /PMS and CuO/PMS systems. Also, under the reaction conditions of 1.6 mM PMS, 0.4 g/L catalyst and initial pH 7, the degradation efficiencies of RhB, Methylene Blue , Reactive Blue 19 and atrazine were respectively up to 100%, 85.39%, 72.84% and 98.44% in 60 min. X-ray photoelectron microscopy analysis indicated that the electrons transfer between CuO and CeO 2 and the formation of oxygen vacancy in CeO 2 should be responsible for the enhanced 1 O 2 production, which involved a new non-radical oxidation pathway for PMS activation by CuO-CeO 2 catalyst. Moreover, the combination of CuO and CeO 2 increased reusability and stability of catalyst, allowing it remove more than 92% of RhB over a wide pH range (pH = 3–9). This study not only proved that CuO-CeO 2 is an efficient and stable PMS activator but also provided a new insight into PMS activation through a non-radical oxidation pathway for organic contaminants removal from wastewater.
研究领域:
环境科学
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化学工程
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催化
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水处理
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产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2022
·
IF 18.027
Ting Wang,Liang Chen,Cong Chen,Mengtian Huang,Youju Huang,Shoujie Liu,Benxia Li
Photocatalytic CO2 conversion into a high-value-added C2 product is a highly challenging task because of insufficient electron deliverability and sluggish C–C coupling kinetics. Engineering catalytic interfaces in photocatalysts provides a promising approach to manipulate photoinduced charge carriers and create multiple catalytic sites for boosting the generation of C2 product from CO2 reduction. Herein, a Cuδ+/CeO2-TiO2 photocatalyst that contains atomically dispersed Cuδ+ sites anchored on the CeO2-TiO2 heterostructures consisting of highly dispersed CeO2 nanoparticles on porous TiO2 is designedly constructed by the pyrolytic transformation of a Cu2+-Ce3+/MIL-125-NH2 precursor. In the designed photocatalyst, TiO2 acts as a light-harvesting material for generating electron–hole pairs that are efficiently separated by CeO2-TiO2 interfaces, and the Cu–Ce dual active sites synergistically facilitate the generation and dimerization of *CO intermediates, thus lowering the energy barrier of C–C coupling. As a consequence, the Cuδ+/CeO2-TiO2 photocatalyst exhibits a production rate of 4.51 μmol–1·gcat–1·h–1 and 73.9% selectivity in terms of electron utilization for CO2 to C2H4 conversion under simulated sunlight, with H2O as hydrogen source and hole scavenger. The photocatalytic mechanism is revealed by operando spectroscopic methods as well as theoretical calculations. This study displays the rational construction of heterogeneous photocatalysts for boosting CO2 conversion and emphasizes the synergistic effect of multiple active sites in enhancing the selectivity of C2 product.
研究领域:
化学
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材料科学
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环境科学
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催化
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光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2013
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IF 2.145
Rui-tang Guo,Yue Zhou,Wei-guo Pan,Jie-nan Hong,Wen-long Zhen,Qiang Jin,Cheng-gang Ding,Shi-yi Guo
CeO 2 /Al 2 O 3 catalysts prepared by three methods were investigated for selective reduction of NO with NH 3 . It was found that the catalyst prepared by the single step sol–gel method had the best SCR activity and SO 2 resistance performance. From the results of BET, XRD, TPD and TPR, it can be concluded that large surface area, strong interaction, highly dispersed nano-crystalline ceria , high NH 3 adsorption capacity and good redox ability might be the main reasons for the excellent performance of CeO 2 /Al 2 O 3 catalyst prepared by the single step sol–gel method.
研究领域:
催化
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Min Jia,Fupei Xu,Fei Zhai,Xiaoying Yu,Meixia Du
BPA aptamers functionalized cerium oxide nanoparticles encapsulated in zeolitic imidazolate framework-8 (CeO 2 @ZIF-8/Apt) were developed to fabricate an all-in-one portable platform for on-site quantitative detection of BPA. By combining biocomposites with a 3,3′,5,5′-tetramethylbenzidine (TMB)-based sodium alginate (SA) hydrogel and smartphone-based RGB analysis, highly sensitive and convenient monitoring of BPA was achieved. CeO 2 @ZIF-8 composites were constructed using a novel surfactant-modified concentration-controlled synthesis strategy. After being functionalized with BPA aptamers, CeO 2 @ZIF-8/Apt biocomposites were used as target-response colorimetric probes for target recognition and signal transduction. The oxidase-like activity of CeO 2 @ZIF-8 was effectively sealed by BPA aptamers and controllably released in a concentration-dependent manner through aptamer-BPA reactions. Utilizing SA hydrogels containing TMB in the caps, a one-step sample addition and one-pot detection can be conveniently achieved and reliably quantified by smartphone-based RGB analysis in an instrument-free way. The detection range of this portable detection platform is 50 pg/mL to 500 ng/mL with limit of detection calculated as 34.88 pg/mL, comparable to that of conventional detection in the solution system (4.57 pg/mL). The recoveries in tap water, apple juice, and milk ranged from 91.02 % and 106.75 %. This work contributes new insights into the design of all-in-one detection platforms for contaminants monitoring in resource-constrained regions.
研究领域:
环境科学
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分析化学
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纳米技术
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生物技术
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 4
·1362-1370
·
IF 3.069
Xingshuang An,Xiaojie Shi,Hui Zhang,Yao Yao,Guangxian Wang,Qingqing Yang,Lianming Xia,Xia Sun
In this paper, a sensitive electrochemical immunosensor modified with graphene oxide–chitosan (GO–CS) and cerium oxide–chitosan (CeO2–CS) using screen-printed electrodes (SPEs) was developed for the determination of aflatoxin M1 (AFM1) in milk. Compared with other electrodes, SPEs are easy for quick detection and no polishing steps are required. Graphene oxide (GO) has strong electrical conductivity and a large specific surface area, which can accelerate the transfer of electrons and fix more anti-AFM1 antibodies (ab-AFM1) on SPEs. Compared with GO, cerium oxide (CeO2) nanoparticles have a smaller diameter, and CeO2 can be uniformly attached to the surface of the GO. Simultaneously, CeO2 has good redox properties and can further accelerate the transfer of electrons, thereby further amplifying the electrochemical signal of the sensor. Chitosan (CS) has strong complexation ability, which can uniformly disperse GO and CeO2. Herein, GO–CS and CeO2–CS gradually modified SPEs to improve their electrochemical response and immobilize more antibodies. The properties of the AFM1 immunosensor were studied via differential pulse voltammetry (DPV) and cyclic voltammetry (CV). Under the optimal conditions, the immunosensor showed great reproducibility and high stability with a detection limit of 0.009 μg L−1. In addition, the immunosensor was successfully utilized for the determination of AFM1 in milk. This immunosensing principle will have broad prospects for the analysis of toxins in food, ensuring the safety of milk and dairy products.
研究领域:
食品安全
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分析化学
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电化学
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毒理学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Xiaodong Hao,Xishuo Zhang,Yang Xu,Yuhao Zhou,Tingting Wei,Zhuangzhuang Hu,Lei Wu,Xinyi Feng,Jin Zhang,Yi Liu,Deqiang Yin,Shufang Ma,Bingshe Xu
To understand the underlying mechanism of the interfacial charge transfer and local chemical state variation in the nonprecious-based hydrogen evolution reaction (HER) electrocatalysts, a model system of the NiO/CeO 2 heterostructure was chosen for investigation using a combination of the advanced electron microscopic characterization and first-principles calculations. The results directly proved that interfacial charge transfer occurs from Ni to Ce, leading to reduction in the valence state of Ce and increased formation of V O . This would optimize ΔG H* and facilitate the hydrogen evolution process, resulting in outstanding HER performance in 1 M KOH with a low overpotential of 99 mV at the current density of 10 mA•cm −2 and a modest Tafel slope of 78.4 mV•dec −1 for the NiO/CeO 2 heterostructure sample. Therefore, the improved HER performance could be attributed to the synergistic coupling interactions and electron redistribution at the interface of NiO and CeO 2 . These results concretely demonstrate the direct determination of the interfacial structure of the heterostructure and provide atomistic insights to unravel the underlying mechanism of interfacial charge transfer induced HER performance improvement.
研究领域:
材料科学
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电化学
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催化
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表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuanjing Meng,Muhammad Akbar,Jie Gao,Manish Singh,Te-Wei Chiu,Baoyuan Wang,Chen Xia,Liangdong Fan
Insufficient ionic conductivity of electrolyte materials and high manufacturing costs create bottlenecks in the commercialization of low-temperature solid oxide fuel cells (LT-SOFCs). Developing the semiconductor-ionic electrolyte represents a new research strategy for high-performance LT-SOFCs because of their attractive ion conduction and associated low polarization loss. In this study, a self-assembly approach is demonstrated by incorporating ABO 3 perovskite La 0.7 Sr 0.3 Cr 0.5 Fe 0.5 O 3-δ (LSCrF) into the fluorite structure CeO 2 , for developing 1LSCrF-xCeO 2 composite as semiconductor-ionic heterostructure for LT-SOFCs with superior electrochemical efficiency at the temperature below 550 °C and even down to 370 °C over unmodified and mechanically mixed samples. Self-assembly enables abundant nanoscale hetero-interfaces accompanied by widely distributed oxygen vacancies , which leads to the superior ionic conductivity of 0.018–0.112 S cm −1 , lower activation energy of 0.54 eV and better peak power density of 136–735 mW cm −2 over control samples at 370–550 °C, and stable operation for 50 h of resultant LT-SOFCs under a galvanostatic mode. This work highlights the important role of self-assembly in designing heterostructural semiconductor based electrolytes for high-performance LT-SOFCs.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
DOI
高影响因子
RARE METALS
·
2024
·Vol. 43
·期 5
·2026-2038
·
IF 9.6
Xu Bin,Jia Lu,Yang Hui,Wang Yue,Fan Si-Yu,Yuan Sai-Sai,Zhang Qi-Tao,Zhang Ming,Ohno Teruhisa
In this study, the truncated octahedral CeO 2 (CeO 2 -to) with special morphology was prepared by the solvothermal method with oleic acid (OA) and oleamine (OM) as the morphology-directing agents. High-resolution transmission electron microscopy (HRTEM) results show that CeO 2 -to exposes composite {100} and {111} facets, while CeO 2 cubic (CeO 2 -c) and CeO 2 octahedral (CeO 2 -o) only expose single crystal facets of {100} plane and {111} plane, respectively. Interestingly, this CeO 2 -to photocatalyst exhibits remarkable photooxidation performance of gaseous acetaldehyde (CH 3 CHO) degradation, in which CO 2 generation value reaches 1.78 and 7.97-times greater than that of CeO 2 -c and CeO 2 -o, respectively. In addition, the active species trapping experiment signifies that superoxide (·O 2 − ) and holes (h + ) are the main reactive substances during the CH 3 CHO degradation process, and the electron paramagnetic resonance (EPR) spectra indicates that the former is the major contributor. Notably, the electron transfer mechanism between CeO 2 -to {100} and {111} facets and the surface oxygen adsorption ability are revealed via density functional theory (DFT) calculations. It is also confirmed that {100} facets are more conducive to the absorption of acetaldehyde than {111} facets. Finally, a reasonable mechanism for improved photocatalytic CH 3 CHO degradation on CeO 2 -to is proposed based on relevant experiments and DFT calculations. This study demonstrates that the systematic development of surface homojunction structured photocatalysts can efficiently increase the degradation activity for volatile organic compounds (VOCs). It also offers additional direction for optimizing the photocatalytic activity of other cerium-based photocatalysts. Graphical abstract
研究领域:
材料科学
·
环境科学
·
纳米技术
·
物理化学
·
催化
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2019
·
IF 2.938
Juan Liu,Xia Wu,Jingjing Liu,Conglu Zhang,Qi Hu,Xiaohong Hou
In this work, ofloxacin degradation was investigated by using Fe 3 O 4 -CeO 2 /activated carbon (AC) as heterogeneous Fenton catalyst. Response surface methodology based on central composite design (CCD) was used to investigate individual and interactive effects of three parameters on the ofloxacin degradation, i.e., solution pH, H 2 O 2 dosage and initial ofloxacin concentration. Optimal conditions were determined to be pH 3.3, H 2 O 2 20.0 mM, ofloxacin 12.0 mg L −1 and catalyst 0.5 g·L −1 . The ofloxacin degradation efficiency and the total organic carbon (TOC) removal was 95% and 54% within 60 min, respectively. The obtained results agreed well with the modeling prediction ( R 2 = 0.9826, and Adj- R 2 = 0.9783). The kinetic analysis implied that the reaction followed first-order kinetic with R 2 = 0.9965. According to mass spectrometry qualitative analysis, eight intermediates of ofloxacin were detected and two possible degradation pathways were proposed. The catalyst still showed degradation efficiency of 82.4% toward ofloxacin after five runs.
研究领域:
环境科学
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Nanomedicine
·
2023
·
IF 8
Ying Zhang,Xiaowen Wu,Chenxi Hou,Kun Shang,Kui Yang,Zhimin Tian,Zhichao Pei,Yongquan Qu,Yuxin Pei
Objective The aim was to produce the first report of assembling degradable stimuli-responsive dithio-polydopamine coating with a cancer target unit for synergistic and targeted drug delivery.Methods A multifunctional drug delivery system was constructed by coating a dual-responsive dithio-polydopamine (PDS) on porous CeO2 nanorods and subsequent conjugation of lactose derivative, where the PDS was formed by self-polymerization of dithio-dopamine (DOPASS).Results The multifunctional drug delivery system displayed excellent cancer targeted ability resulting from the conjugation of lactose derivative, which could specifically recognize the overexpressed asialoglycoprotein receptors on the surface of HepG2 cells. It also showed a dual-responsive property of glutathione and pH, achieving controllable drug release from the cleavage of disulfide bond and subsequent degradation of PDS in cancer cells. Moreover, the degradation of PDS led to the exposure of CeO2 nanorods, which has a synergistic anticancer effect due to its cytotoxicity to cancer cells.Conclusion This work presents a good example of a rational design towards synergistic and targeted DDS for cancer chemotherapies.
研究领域:
纳米技术
·
药学
·
癌症研究
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Runnan Zhang,Yanyan Liu,Wanqi Ou,Yuying Ye,Kai Xu
Polycyclic Aromatic Hydrocarbons (PAHs) are persistent organic pollutants that are widely present in aquatic environments and pose a significant threat to the ecological environment and human health. This study introduces a novel magnetic biochar-supported metal oxide catalyst (CeO 2 /BC@Fe 3 O 4 , CBF) as a peroxymonosulfate (PMS) activator in phenanthrene (PHE) degradation in aqueous environments. The degradation performance of the CeO 2 /BC@Fe 3 O 4 composite material was investigated through degradation experiments. The results showed that under the optimal reaction conditions, the degradation efficiency of 20 mg/L PHE solution within 60 minutes could reach 99.55% and maintained stability within a wide range of pH values. Radical quenching and EPR studies confirmed the involvement of SO 4 ·- , ·OH and 1 O 2 in the removal of PHE during the degradation process. The possible degradation pathways were proposed based on the identification of intermediates. The catalyst demonstrated excellent reusability and was effective in real water samples and for other organic pollutants, highlighting its potential for practical environmental applications.
研究领域:
环境科学
·
催化化学
·
水处理
·
污染物降解
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2016
·
IF 4.055
M.M. Mikhailov,V.V. Neshchimenko,Chundong Li
This study carried out on the diffuse reflective spectra of zinc oxide modified by Al 2 O 3 , ZrO 2 , SiO 2 , CeO 2 , TiO 2 and Y 2 O 3 nanoparticles . It was established that during the modification are formed the solid solutions between zinc oxide and nanopowder as Al 2 ZnO 4 , ZrZnO 3 , Zn 2 SiO 4 , Ce x Zn (1−х) О y , Zn 2 TiO 4 , Y x Zn (1−x) O y . The diffuse reflection spectra of the modified powders are changed in the UV and visible range with a maximum at 395 nm. This band is determined by the intrinsic point defects in the crystal lattice of ZnO as interstitial zinc ions and zinc vacancy. In the IR region also recorded changes due to the absorption of OH-groups adsorbed on the surface modified zinc oxide.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）