MICROCHIMICA ACTA
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2025
·Vol. 192
·期 10
·1-11
·
IF 5.3
Cheng Yan,Wang Yunzhi,Zhang Pengcheng,Hu Xing,Hou Xiaolin,Zhang Bing
Enzyme-mimicking nanomaterials have gained significant attention for use in colorimetric immunoassays. However, further enhancing their mimetic enzyme activity remains crucial for improving assay sensitivity. In this study, CeO 2 /g-C 3 N 4 nanozymes were synthesized with enhanced catalytic activity when exposed to visible light. The irradiation facilitates electron transfer within the CeO 2 /g-C 3 N 4 nanomaterials, leading to the generation of reactive oxygen species (ROS). These ROS then promote the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB), causing a distinct color change. Based on this, a novel colorimetric immunoassay platform was developed, using the CeO 2 /g-C 3 N 4 nanomaterials as labels. Under visible light, the color development signal was significant amplified, resulting in improved sensitivity. This approach showed a linear response for the detection of carcinoembryonic antigen (CEA) in the range 0.5–30 ng/mL, with a limit of detection (LOD) of 0.13 ng/mL. The assay also demonstrated high specificity and excellent reproducibility. Consequently, this method offers a promising strategy for early cancer diagnosis and holds considerable potential for wider clinical applications. Graphical
研究领域:
肿瘤学
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免疫学
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纳米医学
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分子诊断
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转化医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Jie Zhou,Beibei Zhu,Lu Wang,Yan Bao,Guofeng Guan
Higher electron transfer efficiency is an important way to improve the activity of photocatalysts. A novel Z-scheme CdS/CeO 2 /g-C 3 N 4 nanocomposite was successfully synthesized by a solvothermal method, and its photocatalytic activity was evaluated by the degradation of phenol. The phase structure, morphology, surface structure, and atomic valence state of the as-obtained photocatalyst were characterized by XRD, SEM, TEM, FT-IR, XPS, and UV–Vis absorption spectroscopy, respectively. The CdS/CeO 2 /g-C 3 N 4 nanocomposite exhibited a remarkable photocatalytic activity and a rapid degradation ability for phenol with a degradation rate of 95 % in 180 min, which was considerably better than those of pure CeO 2 and CdS/CeO 2 under the same conditions, suggesting a synergistic effect in the nanocomposite. The enhancement of the photocatalysis ability of the nanocomposite is mainly attributed to the higher adsorption capacity of three-dimensional porous g-C 3 N 4 and the three-dimensional space electric field formed by its complex with CdS and CeO 2 . The three-dimensional porous structure is not only conducive to the efficient adsorption of pollutants but also provides active sites for photocatalytic reactions. The three-dimensional space and the network interconnection structure are conducive to the directional migration of photogenerated charges and increase the carrier lifetime. In brief, this work provides a new route to the design and synthesis of CdS/CeO 2 /g-C 3 N 4 for colorless organic pollutants photodegradation under visible light.
研究领域:
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
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Chen Yang,Jian Yang,Shuangshuang Liu,Mingxue Zhao,Xu Duan,Hongli Wu,Lang Liu,Weizao Liu,Jiangling Li,Shan Ren,Qingcai Liu
Owing to its feasibility, efficiency in light-harvesting and effectiveness in the interfacial charge transfer between two n-type semiconductors, constructing heterojunction photocatalysts have been identified as an effective way for enhancing the photocatalytic properties. In this research, a C–O bridged CeO 2 /g-C 3 N 4 (cCN) Step-scheme (S-scheme) heterojunction photocatalyst was constructed successfully. Under visible light irradiation, the cCN heterojunction exhibited the photocatalytic degradation efficiency of methyl orange, which was about 4.5 and 1.5 times higher than that of pristine CeO 2 and CN, respectively. The DFT calculations, XPS and FTIR analyses demonstrated the formation of C–O linkages. And the calculations of work functions revealed the electrons would flow from g-C 3 N 4 to CeO 2 due to the difference in Fermi levels , resulting in the production of internal electric fields . Benefiting from the C–O bond and internal electric field, the photo-induced holes in the valence band of g-C 3 N 4 and the photo-induced electrons from conduction band of CeO 2 would be recombined when exposed to visible light irradiation, while leaving the electrons with higher redox potential in the conduction band of g-C 3 N 4 . This collaboration accelerated the separation and transfer rate of photo-generated electron-hole pairs, which promoted the generation of superoxide radical (•O 2 − ) and improved the photocatalytic activity .
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Xuecheng Liu,Linxin He,Ximin Chen,Liqiong Du,Xingxing Gu,Song Wang,Ming Fu,Fan Dong,Hongyu Huang
Ceria dioxide supported on graphitic carbon nitride (CeO 2 /g-C 3 N 4 ) composites were facilely synthesized to be application for photocatalytic hydrogen (H 2 ) generation in this present work. The physical and chemical properties of CeO 2 /g-C 3 N 4 nanocomposites were determined via a series of characterizations. The CeO 2 /g-C 3 N 4 composites prepared by facile thermal annealing and rotation-evaporation method exhibit excellent photocatalytic H 2 evolution with visible-light illumination. The best hydrogen generation rate of CeO 2 /g-C 3 N 4 composite with 1.5 wt% Pt is 0.83 mmol h −1 g −1 , which is almost same as that of composite with 3 wt% Pt prepared by simple physical mixing method. The significantly developed photocatalytic activity of CeO 2 /g-C 3 N 4 composite is majorly ascribed to the stronger interfacial effects with the more visible-light absorbance and faster electron transfer . This work reveals that construction of the CeO 2 /g-C 3 N 4 composite with high disperse and close knit by the facile thermal annealing and rotation-evaporation method could be an effective method to achieve excellent photocatalytic hydrogen evolution performance.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 9
·5539-5545
·
IF 1.134
Yin Hao Yong,Zheng Yi Fan,Wang Ling
A convenient and simple phenol electrochemical sensor was constructed based on the Au/CeO2/ g-C3N4 nanocomposites, which were obtained by loading the gold–cerium oxide (Au/CeO2) nanoparticle on graphite-like carbon nitride (g-C3N4)
through precipitation–reduction methods. The microstructure and morphology of Au/CeO2/g-C3N4 nanocomposite were verified using different techniques such as XRD, TEM, and HRTEM. Voltammetry and amperometry methods were used to study the electrochemical
performance of the constructed phenol electrochemical sensors. The results demonstrated evidently that the combination of Au/CeO2 and g-C3N4 may improve sensing performances of phenol determination. The detection linear range of the sensor was 10–90 μM
under the optimum parameters. The Au/CeO2/g-C3N4 based electrochemical sensor also has low detection limits (2.33 μM) and high sensitivities (0.1080 mA/μM) for phenol detection. In addition, the sensor also had considerably favorable anti-interference
performance. As a consequence, the sensor demonstrated that the electrochemical system provided a promising effective strategy for detection of phenol.
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2023
·
IF 13.1
Zhiyao Chu,Junqi Li,Hong Yong Sohn,Chaoyi Chen,Xiao Huang,Yuanpei Lan,Arun Murali,Junshan Zhang
In this work, novel CeO 2 –C-g-C 3 N 4 S-scheme heterojunctions with significantly enhanced photocatalytic performance were prepared for the first time by a facile one-step molten KCl–LiCl method. The formation mechanism of CeO 2 –C-g-C 3 N 4 was discussed, where g-C 3 N 4 turned to C by carbonizing and the surface C content was adjusted by controlling the synthesis conditions. The photocatalytic property of the ternary composites first increased and then decreased with synthesis temperature and time. The 580 °C 4h CeO 2 –C-g-C 3 N 4 exhibited the best performance towards MB (Methylene blue) and TC (Tetracyclines) degradation with a removal degree of 99.9% and 92.5%, respectively. The surface C/N ratio was a key index that influenced the photocatalytic performance, and was calculated to be 0.918–1.352 for various CeO 2 –C-g-C 3 N 4 catalysts. The 580 °C 4h CeO 2 –C-g-C 3 N 4 had an appropriate C/N ratio of 0.930 and a narrow band gap. The formed S-scheme 2D heterojunctions and generated C clearly promoted the separation of photo-excited e - / h + . Besides, it was indicated that e - and · O 2 − were the main active species for TC photodegradation . The 580 °C 4h CeO 2 –C-g-C 3 N 4 exhibited a large BET surface area, high negative zeta potential , strong π-π electron donor-acceptor interaction, and an excellent MB adsorption ability. It was evident that chemisorption on catalyst surface played an important role for adsorbing MB. The formation mechanism of CeO 2 –C-g-C 3 N 4 and the effects of the surface C/N ratio on photocatalytic performance, determined in this work, offer new insights for preparing and structuring highly effective photocatalysts , which is expected to promote further photocatalytic and adsorption applications.
研究领域:
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
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhiyao Chu,Junqi Li,Yuan-Pei Lan,Chaoyi Chen,Jian Yang,Deyang Ning,Xuewen Xia,Xisong Mao
A ternary photocatalyst of LaOCl/CeO 2 -g-C 3 N 4 was designed and firstly synthesized by a facile KCl–LiCl molten salt method. The 60 %LaOCl/40 %CeO 2 -g-C 3 N 4 with a 6: 4 weight ratio of LaOCl to CeO 2 has an optimal degradation ratio (nearly 100%) for methylene blue (MB) with an impressive cyclic stability. Both of adsorption and photodegradation contribute to the high MB removal ratio, and kinetic study results show that the rate constant of photocatalytic degradation route is 0.0174 min −1 , which is less than that of adsorption process (2.4406 min −1 ). The excellent adsorption performance of 60 %LaOCl/40 %CeO 2 -g-C 3 N 4 is attributed to its negative zeta potential (−35.40 mV) and larger average pore size. The photochemical characterizations suggest that the 60 %LaOCl/40 %CeO 2 -g-C 3 N 4 form a dual Z-scheme heterojunction , which enhances its separation efficiency of photogenerated e - / h + with an outstanding redox ability, and further promotes the photocatalytic activity.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Jie Zhou,Beibei Zhu
Dimensional regulation and heterostructure building strategy are the significant means to boost the property of semiconductor photocatalysts . Herein, CeO 2 /g-C 3 N 4 (CeCN) composites with 1D/3D structure were synthesized by compounding one-dimensional CeO 2 nanorods and three-dimensional porous carbon nitride materials. Diverse characterization methods, BET, XRD , SEM/TEM, FT-IR, XPS and UV–vis DRS , to name a few, were conducted to reveal the surface area, micro shape, crystal structure, surface functional groups and photoconductive properties of the samples. The photocatalytic properties of catalyst were estimated by photodegradation of ciprofloxacin (CIP) under visible light irradiation. The results suggested that CeO 2 nanorods with 1D structure and g-C 3 N 4 with 3D porous structure are successfully composite into 1D/3D composites without any crystal structure and surface functional groups changed. The optimal CeCN25 exhibited brilliant photodegradation performance with 96.3% degradation efficiency within 100 min under visible light irradiation. The dimension control strategy made the material form porous structure and increases the adsorption performance of the material, while the heterostructure construction strategy formed a space electric field with efficient charge separation and transfer, which prolonged charge life. The combination of two strategies was the crucial factor for the eminent catalytic activity of photocatalysts. This work supplies thinking for the directional design and synthesis of composite catalysts with high photocatalytic activity .
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Shuai Wang,Jirong Long,Tian Jiang,Li Shao,Dan Li,Xianchuan Xie,Feigao Xu
Magnetic Fe 3 O 4 /CeO 2 /g-C 3 N 4 (FCG) composites with a visible-light response were successfully synthesized and characterized as a heterogeneous Fenton-like catalyst for tetracycline hydrochloride (TCH) degradation. The optimal mass ratio, pH value, catalyst addition, H 2 O 2 concentration, and temperature were explored. Photodegradation studies showed the best activity when the mass ratio of the composite was 1:0.75:0.75 (F 1 C 0.75 G 0.75 ) and the removal rate of TCH by F 1 C 0.75 G 0.75 reached 96.63% after 180 min. The first order kinetic constant of the reaction system was 0.0533 min −1 . According to the test of free radical scavenger and metal leaching tests, the Fenton-like degradation of TCH by F 1 C 0.75 G 0.75 composite was analyzed. g-C 3 N 4 effectively reduced the leaching of Fe and the location where TCH was attacked by hydroxyl radicals was mainly on the surface of the catalyst. The reusability of the F 1 C 0.75 G 0.75 composites was also studied after five cycles.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2021
·Vol. 13
·期 8
·2034-2044
·
IF 5.686
Lei Guo,Jingxia Yang,Huiqing Zhang,Runkai Wang,Jingli Xu,Jinjie Wang
Graphical The rule of seven : The brilliant photocatalytic performance of CN−OH/CeO 2 −NP is due to the synergistic improvement of surface structure. The heptazine ring of g−C 3 N 4 can establish a consummate complexing with K ion. Moreover, unsaturated-coordination O between CN−OH/CeO 2 −NP composite can establish a firmly interfacial interaction with g−C 3 N 4 nanosheets by p–π bond. Furthermore, the hydroxyl groups on the surface of ceria can form hydrogen bond with the NOH/NH x group of g−C 3 N 4 nanosheets. Photocatalysis is an efficient and eco-friendly method of solving the environmental problems, but the low charge separation efficiency of photocatalysts limits their application. Herein, we report the fabrication of CeO 2 /g−C 3 N 4 composites via an in-situ growth of CeO 2 on the dispersed g−C 3 N 4 sheets (CN−OH) in an strong KOH condition, and the resultant CeO 2 /CN−OH composites set up a new interface structure, which demonstrate a dramatically boosted the photocatalytic activity compared with CeO 2 /g−C 3 N 4 composites by conventional two-step combination method. The decomposition efficiency of CeO 2 /CN−OH for 2,4-dichlorophenol (2,4-DCP) degradation comes up to 6 times of bare CeO 2 or g−C 3 N 4 . Compared to conventional CeO 2 /g−C 3 N 4 , the CeO 2 /CN−OH showed 65.9 % and 23.2 % improvement for 2,4-DCP and Cr(VI) removal, respectively. The significantly enhanced photodegradation ascribe to the alkaline modified CN−OH and the fabrication of CeO 2 /CN−OH n–n type heterojunction, both can improve the charge separation efficiency and increase the reaction active sites. Furthermore, the probable pathway and concreted photocatalytic mechanism for 2,4-DCP degradation are proposed based on the detected intermediate products.
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
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yuanyuan Chai,Lu Zhang,Qianqian Liu,Fengli Yang,Wei-Lin Dai
Oxidation of amines to imines under light irradiation has been widely studied in the field of heterogeneous catalysis. For the first time, we demonstrate a facile mixing calcination approach for the preparation of CeO2/g-C3N4-x as a heterojunction catalyst for the photo-oxidative coupling of benzylamine under the irradiation of a 300 W Xe arc lamp at 308 K with the air balloon. It was found that the rate constant of CeR/CN-66% was 3 times as high as that of pure CeO2 or g-C3N4. All kinds of structural characterizations suggested the formation of heterojunction between the CeO2 and g-C3N4, serving as a tunnel for the transfer of photoinduced charge, which may contribute to the improvement of photoactivity. Moreover, the Ce3+ ions and oxygen vacancy significantly promoted the adsorption and activation of substrate or molecular O2. Therefore, the efficient separation of the charges, the prolonged photoinduced electron lifetime, and the abundant defect structure (increased content of Ce3+ ions or the oxygen vacancy) were considered as the main factors for the higher photo-oxidation efficiency of the CeR/CN-66%. Another striking observation that was noticed was that the CeR/CN-66% was recycled up to five cycles under the same condition and was found to be highly efficient without any obvious decrease in the activity or selectivity due to the outstanding stability of the defect structure. Thus, highly efficient CeR/CN-x heterojunction catalyst was synthesized in this work by a simple approach for the photo-oxidation of benzylamine under mild reaction conditions, and this finding may provide wide applications in other photocatalysis areas.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xin Li,Jingru Guan,Haopeng Jiang,Xianghai Song,Pengwei Huo,Huiqin Wang
Construction of multi-interface contact step-scheme (S-scheme) photocatalyst is a promising pathway to achieve high-electron transfer efficiency for photocatalytic CO 2 reduction. In this paper, g-C 3 N 4 nanosheets were selected as the main photocatalyst, rod-like CeO 2 (R-CeO 2 ) with unique Ce 4+ →Ce 3+ conversion property and rGO were loaded on the g-C 3 N 4 surface to construct 2D-1D-2D sandwich photocatalyst. The yields of CO and CH 4 were about 63.18 and 32.67 μmol/g after 4 h when the rGO/R-CeO 2 /g-C 3 N 4 was used as catalyst, which were about 4 and 6 times higher than that of pure CN, respectively. Cyclic experiments proved that the composite had excellent photocatalytic and material stability. Photoelectrochemical tests showed that the construction of S-scheme electron transfer model and the introduction of rGO can great enhance the electron transmission and separation of photogenerated electron-hole pairs. CO 2 adsorption test identified that the loading of R-CeO 2 and rGO obviously enhanced the CO 2 adsorption ability of pure g-C 3 N 4 . Density functional theory (DFT) calculations used to analyze the electron transfer path and the formation of the build-in electric field at the semiconductor interface. In-situ FTIR and 13 CO 2 element-tracer detection carried out to research the process of CO 2 photoreduction. A possible multi-interface contact S-scheme electron transfer mechanism for enhanced CO 2 photoreduction activity has been discussed.
研究领域:
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
危险品化学品经营许可证（带存储）