- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
CeO2 Nanowire-BODIPY-Adenosine Triphosphate Fluorescent Sensing Platform for Highly Specific and Sensitive Detection of Arsenate
摘要： Effective and sensitive monitoring of arsenate in drinking water is significant for risk management of public health. Here, we demonstrated that CeO2 nanowire acted as an efficient quencher for small fluorescent molecules with phosphate group, BODIPY-adenosine triphosphate (BODIPY-ATP) and riboflavin-5'-phosphate (Rf-P), and developed CeO2 nanowire-BODIPY-ATP platform for highly selective and sensitive detection of arsenate. The response strategy was based on the competitive coordination chemistry of CeO2 nanowire between arsenate and phosphate group of BODIPY-ATP. Arsenate displaced adsorbed BODIPY-ATP to enhance fluorescence, allowing detection of arsenate down to 7.8 nM, which is lower than the WHO defined limit 130 nM. Excellent linear range of 20-150 nM and 150-1000 nM was obtained. Importantly, this system was simple in design and convenient in operation. And the platform exhibited excellent selectivity for arsenate without the interference of phosphate ions. Finally, the proposed method had been successfully employed for determination of arsenate in real water samples.
关键词： competitive coordination,BODIPY-ATP,CeO2 nanowire,arsenate,fluorescent sensing
更新于2025-09-09 09:28:46
-
Electrical and Mechanical Properties of CeO2-Based Thin-Film Coatings Obtained by Electrophoretic Deposition
摘要： Nanometer Ce0.8(Sm0.75Sr0.20Ba0.05)0.2O2 – δ powder with mean nanoparticle size of 15 nm has been obtained by laser evaporation of a solid-phase target followed by condensation. The nanopowder has been used to prepare suspensions for electrophoretic deposition in a mixed isopropanol : acetyl acetone = 50 : 50 vol % disperse medium offering the unique property of self-stabilization. Optimal conditions for electrophoretic deposition have been found, and uniform thin-film electrolytic coatings have been formed on a La2NiO4 cathodic carrier substrate (12–15% porosity). It has been shown that the resulting electrolyte offers a high adhesivity and has, after sintering at 1400°C, a compact granular structure with grains from 1 to 8 μ m in size. The conductivity of the 2-μ m-thick electrolyte equals 0.1 S/cm at 650°C.
关键词： solid oxide fuel cells,nanopowder,electrophoretic deposition,conductivity,CeO2-based thin-film coatings
更新于2025-09-09 09:28:46
-
T?ng h?p v?t li?u CeO2 kích th??c nanomet trên n?n SiO2 và nghiên c?u kh? n?ng quang xúc tác c?a chúng
摘要： The nanomaterials CeO2 with average size of 50 nm on the SiO2 base which performed very high photocatalytic properties were successfully synthesized by the sol-gel combustion method. Starting with freshly precursor, the prepared sample was studied the morphology and characterized by X-ray diffraction, field-emission scanning electron microscopy and Brunauer-Emmetl-Teller method at 77 K. The nanocomposite material contained only 10 % and 20 % of CeO2, but it still presented a significant efficiency on methyl orange degradation under visible light. The CeSi20 which includes 20 % of CeO2 nanoparticles revealed that the photocatalytic capacity with over 97 % of methyl orange was removed after 60 min of the irradiation.
关键词： CeO2,Nanomaterials,photocatalytic,methyl orange degradation
更新于2025-09-09 09:28:46
-
Novel anti-ultraviolet performances of thin films polyurethane containing nano-mixed oxides CeO <sub/>2</sub> -TiO <sub/>2</sub>
摘要： The nano-mixed oxides CeO2-TiO2 was synthesized by gel combustion method using polyvinyl alcohol as fuel and mixtures of titanium trichloride and cerium(IV) nitrate at a relatively low calcination temperature of 550°C for 2 h. The prepared CeO2-TiO2 nanoparticles with a specific area of 65.70 m2 g-1 were dispersed in polyurethane matrix in different concentration conditions from 0.0 to 1.5 wt% to study ultraviolet durability following HONDA HES D 6501-97 standards. After 400 h of testing in the QUV accelerate weathering tester, the thin film containing 1 wt% CeO2-TiO2 nano-mixed oxides has presented the noticeable capacity for absorbing ultraviolet light by only 6.8 g.u change in specular gloss at 60° and DE = 3.66 in color difference.
关键词： hybrid material,thin film,CeO2-TiO2,nano-mixed oxides,polyurethane,anti-ultraviolet
更新于2025-09-09 09:28:46
-
Solution combustion synthesis and characterization of phosphorus doped TiO2–CeO2 nanocomposite for photocatalytic applications
摘要： Phosphorus doped TiO2-CeO2 nanocomposite (P-TiO2-CeO2) was synthesized by solution combustion method. The prepared sample has been heated at di?erent temperatures and characterized by X-ray di?raction (XRD), scanning electron microscopy (SEM), UV–vis absorption spectra, X-ray photoelectron spctroscopy (XPS). XRD analysis reveals the retarded phase transition by increased thermal stability due to phosphorus doping. FE-SEM shows the porous structure of the sample. The absorption edge of the P/TiO2-CeO2 nanocomposite exhibits redshift with increasing heating temperature with its value around 2.93 eV, 2.90 eV and 2.89 eV at 400 °C, 500 °C and 600 °C respectively. From the observed P2p XPS peak, it is con?rmed that the doped phosphorus enters substitutionally into Ce4+/Ti4+ site, which can play an important role in the photocatalytic activity of the sample. The binding energy of Ti 2p XPS peak increases slightly from 458.5 eV to 458.8 eV due to interaction between titanium and cerium.
关键词： Phosphorus doping,TiO2,CeO2,XPS,TiO2-CeO2 nanocomposite
更新于2025-09-04 15:30:14
-
Synthesis and Visible-Light Photocatalytic Activity of CeO <sub/>2</sub> Nanoboxes Based on Pearson’s Principle
摘要： The CeO2 nanoboxes with well-defined hollow structure were fabricated by template-engaged coordinating etching of Cu2O cubes based on Pearson’s hard and soft acid-base principle. The morphologically uniform CeO2 nanoboxes have an average edge length of 400 nm and shell thickness of around 60 nm. The strong chemical affinity between Cu+ and S2O2?3 was the driving force for the etching of Cu2O templates and the formation of shells. A possible formation mechanism of CeO2 nanoboxes was proposed. The synthesized CeO2 nanoboxes exhibit good photocatalytic activity for photodegradation of acid orange 7 (AO 7) under visible light irradiation.
关键词： Hollow,CeO2,Nanostructure,Cu2O Template
更新于2025-09-04 15:30:14
-
Upconversion Tm3+:CeO2/Palygorskite as direct Z-scheme heterostructure for photocatalytic degradation of bisphenol A
摘要： Novel Tm3+:CeO2/palygorskite (Pal) nanocomposites were prepared by a hydrothermal-deposition method. X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis spectrum（UV-Vis）, photoluminescence spectroscopy（PL）and Mott-Schottky analysis were employed to characterize the products. Results indicated that Pal skeleton possessed abundant adsorption sites and shortened band gap after modified by hydrochloric acid. Tm3+ doping enhanced the utilization of solar light due to its upconversion from visible to ultraviolet light. Meanwhile, the adsorption edge of the Tm3+:CeO2 was extended to visible region with the formation of heterojunctions. The product intimated Tm3+:CeO2/Pal behaved strongest upconversion luminescence when the doping fraction of Tm3+ was optimized to be 0.02, and the photocatalytic degradation of bisphenol A (BPA) reached 86 % when the mass content of Tm3+:CeO2 as compared to Pal was optimized to 10 wt%. The direct Z-scheme system was constructed between Pal and Tm3+:CeO2 leading to the improved charge-separation efficiency and maintenance of high redox potential.
关键词： CeO2,Upconversion,Palygorskite,Photocatalysis,Z-scheme
更新于2025-09-04 15:30:14
-
Enhancement of visible‐light photocatalytic hydrogen production by CeCO3OH in g‐C3N4/CeO2 system
摘要： Promoting the separation of photo-generated carriers is significantly important to improve the efficiency of photocatalytic hydrogen production. Therefore, we prepared g-C3N4/CeCO3OH/CeO2 (CeCeCN) ternary nanocomposite via an easy synthetic way using g-C3N4 and CeO2 as reactants. A CeCO3OH layer was formed and resulted in the novel ternary photocatalyst. The CeCeCN composite shows superior photocatalytic (PC) H2 generation performance in sunlight excitation. The H2 evolution rate is about 764 μmol h-1 g-1, which is over 11 times larger than those of g-C3N4 and CeO2. Compared with g-C3N4 and CeO2, CeCeCN further shows a larger photo-response current density and a lower charge-transfer resistance. The remarkably increased photocatalytic property of CeCeCN is because of the efficient charge migration induced by the formed heterojunction. Our findings demonstrate that building multi-heterostructures can liberate more excited electrons for efficient hydrogen production under sunlight.
关键词： heterojunction,CeCO3OH,g-C3N4/CeCO3OH/CeO2,photocatalytic hydrogen evolution,ternary
更新于2025-09-04 15:30:14