Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Junzi Huang,Mengjie Lu,Peng Wei,Yahong Xie,Huihui Xie,Min Liu,Liang Li,Jindou Hu,Zhiwei Zhang,Ying Qi
Organic pollutants pose a great threat to human health due to the bioaccumulation, toxicity, carcinogenicity and mutagenicity. However, it is not easily degraded because of the stable properties. Therefore, the current challenge is to degrade organic pollutants efficiently with low-energy consumption. In this study, a Z-type heterojunction material CeO 2 /ZnO was constructed by hydrothermal and wet chemistry methods, and the photocatalytic degradation performance was studied using tetracycline (TC) as a model organic pollutant. It was showed that the 40% CeO 2 /ZnO composite material has excellent activity, capable of degrading 95.9% of TC in 75 min, and has good resistance to common interference ion. The results demonstrated that the 3D nanoflower of the composite material provided a large specific surface area for photocatalytic reaction, significantly improving the catalytic active sites. And the CeO 2 /ZnO could effectively reduce the recombination rate of photogenerated holes and electrons and effectively broadened the visible light absorption range, expanding the application range of the heterojunction and improving the utilization efficiency of the solar energy. What is more, the prepared heterojunction had outstanding photocatalytic activity in actual water samples. It can be used to degrade refractory organic pollutants, such as ciprofloxacin, methylene blue, rhodamine B, etc.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Functional Materials Letters
·
2022
·
IF 1.49
Zhen Mou,Hongyan Zhou,Shuang Wu,Wenqi Tang,Yiyu Zhang,Kejie Zhang,Zhipin Zhou
Three kinds of CeO 2 /ZnO nanocomposites were successfully prepared by the hydrothermal method. The morphology and composition tests show that the CeO 2 cubic nanoparticles with a side length of about 10 nm are uniformly loaded on the irregular ZnO nanosheets. Under ultraviolet light irradiation, CeO 2 /ZnO (1:5) has the best photocatalytic performance and the degradation efficiency of tetracycline (TC) is 97.2% within 140 min. In addition, with CeO 2 /ZnO (1:5) as photocatalyst, the degradation rate of TC only decreased by 1.3% after 6 cycles, indicating that CeO 2 /ZnO (1:5) has excellent photocatalytic stability. Therefore, the CeO 2 /ZnO (1:5) nanocomposite has a bright future for industrial application in wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Shuang Li,Yuchi Zhang,Le Han,Xianliang Li,Yan Xu
Heterojunction formation has been considered as an effective way for exploring ultrahigh sensitive multi-metal oxide based gas sensors. Herein, unique hierarchical radial CeO 2 /ZnO heterostructures with excellent triethylamine (TEA) gas-sensing performance were successfully prepared via a feasible solvothermal method . The morphology, microstructure and gas-sensing performance of the composite were systematically characterized and investigated. The selective TEA gas response of the radial CeO 2 /ZnO heterostructure was increased by ten times as compared to that of pure ZnO phase, ascribing to the abundant reactive sites induced by the formation of n-n heterojunction . Furthermore, the radial CeO 2 /ZnO n-n heterojunction exhibited the best TEA gas sensitivity with R a /R g = 92.17 at an operating temperature of 200 °C, a fast response/recovery time of 29 s/23 s, and a long-term stable repeatability for at least 60 days. The excellent selectivity of CeO 2 /ZnO heterojunction for TEA sensing is also remained even when mixing with other interferent gases. The interface-dependent and enhanced TEA sensing property of CeO 2 /ZnO can be ascribed to its intriguing radial morphology, for which the CeO 2 nanoparticles located in the internal structure of the composite while the ZnO hexagonal prism grew radially outward. The well assembled hierarchical CeO 2 /ZnO n-n heterojunction with abundant accessible active sites significantly facilitate the surface reaction and diffusion of target gas molecules at the interface between CeO 2 and ZnO during gas sensing process.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 30
·期 5
·1589-1599
·
IF 1.637
Zhao Peng,Zhang Jinteng,Jiang Jingjing,Wang Hongtao,Xie Tengfeng,Lin Yanhong
A novel Pt/CeO 2 /ZnO ternary composite is synthesized via two simple procedures of hydrothermal and photoreduction. The crystal structure, morphology, and composition of as-prepared samples are characterized by XRD, SEM, HRTEM, XPS and UV–Vis DRS. Because both ZnO and CeO 2 are good photocatalytic semiconductors, photocatalytic activities of the samples are evaluated by the degradation of phenol aqueous solution (25 mg/L). Under the strong interaction among the Pt, CeO 2 and ZnO, the maximum photocatalytic activity is observed in the Pt/CeO 2 /ZnO ternary composites and 91% phenol can be degraded in 60 min under UV light irradiation. The probable photocatalytic mechanism is discussed by active species trapping experiments along with SPV, TPV, PL and PA measurements. The enhanced photocatalytic activity is attributed to the redox cycle of Ce 4+ ↔ Ce 3+ , the effective interface between ZnO and CeO 2 as well as the electron transfer action of Pt nanoparticles. The photocatalytic activity almost unchanged after four cycles and proves excellent reusable photocatalysts. This work shows the synergistic effect of rare earth elements and noble metals in the photocatalytic process, which facilitates their practical application in toxic pollution abatement.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Song Hui,Sun Kai,Huang Hengming,Ning Shangbo,Wang Shengyao,Wang Zhuan,Weng Yuxiang,Cui Yi,Li Yifan,Wang Xu-sheng,Wang Defa,Liu Lequan,Wang Zhou-jun,Ye Jinhua
The direct photocatalytic oxidation of methane to value-added chemicals has garnered considerable interest in recent years. However, achieving high productivity while maintaining high selectivity at an appreciable methane conversion rate remains a formidable challenge. Here, we present photochemically-triggered and photothermally-enhanced oxidative coupling of methane to multi-carbon C 2+ alkanes over an Au and CeO 2 nanoparticle-decorated ZnO photocatalyst, which exhibits a record-breaking C 2+ production rate of 17,260 μmol g −1 h −1 with ~90% C 2+ selectivity under wide-spectrum light irradiation without a secondary source of heating. Comprehensive characterizations and computational studies reveal that CH 4 activation is a photochemical reaction initiated by ultraviolet light-excited ZnO, and the introduction of CeO 2 substantially enhances the activation of CH 4 and O 2 due to the cooperative interaction between Au and CeO 2 . Concurrently, Au nanoparticles capture visible and near-infrared light to generate localized heating, which greatly promotes the subsequent desorption of produced methyl radical for C–C coupling prior to undergoing further undesired overoxidation.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 34
·11897-11903
·
IF 4
Ying Liu,Baoteng Li,Sailong Xu,Ying Guo
In this paper, highly dispersed hierarchical coral spheres of CeO2/ZnO have been constructed through a facile template-free hydrothermal strategy, followed by an annealing treatment. The resulting coral spheres exhibit enhanced activity for acetone sensing compared with CeO2 or ZnO as well as excellent cyclability and long-term stability. At the optimum working temperature of 245 °C, by controlling the ratio of Ce/Zn, the highest response of the coral spheres towards 100 ppm acetone is up to 145, which is about 5.5 times that of ZnO coral spheres. The significantly improved gas sensing activity may be ascribed to the well-dispersed and assembled CeO2 nanoparticles on the surface of ZnO coral spheres and the heterojunctions between CeO2 and ZnO, which produced abundant oxygen vacancies in the CeO2/ZnO coral spheres.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
PubMed
高影响因子
SENSORS
·
2021
·Vol. 21
·期 24
·8269
·
IF 3.576
Kai Sun,Guanghui Zhan,Hande Chen,Shiwei Lin
CeO2/ZnO-heterojunction-nanorod-array-based chemiresistive sensors were studied for their low-operating-temperature and gas-detecting characteristics. Arrays of CeO2/ZnO heterojunction nanorods were synthesized using anodic electrodeposition coating followed by hydrothermal treatment. The sensor based on this CeO2/ZnO heterojunction demonstrated a much higher sensitivity to NO2at a low operating temperature (120 °C) than the pure-ZnO-based sensor. Moreover, even at room temperature (RT, 25 °C) the CeO2/ZnO-heterojunction-based sensor responds linearly and rapidly to NO2. This sensor’s reaction to interfering gases was substantially less than that of NO2, suggesting exceptional selectivity. Experimental results revealed that the enhanced gas-sensing performance at the low operating temperature of the CeO2/ZnO heterojunction due to the built-in field formed after the construction of heterojunctions provides additional carriers for ZnO. Thanks to more carriers in the ZnO conduction band, more oxygen and target gases can be adsorbed. This explains the enhanced gas sensitivity of the CeO2/ZnO heterojunction at low operating temperatures.Keywords:gas sensor;NO2detection;heterojunction;low operating temperature;CeO2
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Jinlong Li,Hong Zhou,Shuo Huang,Xin Gao,Qinhan Liu,Shuai Zhang,Hang Su,Haopeng Zhang,Hongyan Yue
Low conductivity and slow reaction kinetics are partly responsible limiting the sensing performance of metal-organic-framework (MOF) derived metal oxides, which can be overcome by rational composition and novel microstructural design. In this study, hollow dandelion-like Ce-Zn MOF/reduced graphene oxide (rGO) nanosheets precursor were synthesized by solvothermal reaction and the precursor was annealed to obtain CeO 2 -ZnO/rGO (CZO/rGO). The effects of polyvinylpyrrolidone (PVP), rGO and annealing temperature on its morphology and sensing properties were investigated. The unique morphology of CeO 2 -ZnO provides abundant active sites and large specific surface areas which can improve the ion diffusion efficiency, and the high conductivity of rGO reduces the interfacial resistance and improves the electron transfer rate. The optimized CZO/rGO/ITO electrode achieves a high sensitivity of 17.67 μA·μM -1 ·cm -2 and a limit of detection of 2.1 nM (S/ N = 3) for dopamine (DA) detection. This study broadens the application of MOF derivatives in DA sensing.
研究领域:
材料科学
·
电化学
·
传感器与生物传感器
·
纳米材料
·
分析化学
✓ 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）