Iron-copper nanozyme (Fe-Cu NZs) with a good peroxidase activity was prepared by hydrothermal method using copper nitrate as copper source, iron acetate as iron source and 2, 5-dihydroxyterephthalic acid as organic ligand. Norfloxacin (NOR) can make its peroxidase activity enhance. When Fe-Cu NZs oxidized the colorless TMB to light blue products, after the addition of NOR, it was observed that the color of system turned into dark blue. The absorbance of system was linearly correlated with NOR concentration ranged from 3.3 μM to 60 μM, and the detection limit (LOD) was 1.39 μM. A colorimetric assay for NOR determination in foods was established by using the peroxidase activity of Fe-Cu NZs, with detection time of 1 min. Furthermore, NOR was simultaneously catalyzed to degrade by Fe-Cu NZs. The results showed that Fe-Cu NZs had promising applications for the determination and degradation of NOR.
Polyurethane - Dispersed Diazo Black GNN Polymer dye (PU-DDB GNN) was synthesized by incorporation of DDB GNN into polyurethane chains. The expected structure of polyurethane-dispersed diazo black GNN polymer dye was confirmed by FT-IR and UV-vis spectra. The photochromic phenomenon of polyurethane-dispersed diazo-black GNN dyes was investigated. And through the thermogravimetric analysis and differential calorimetry analysis, it is confirmed to be an amorphous structure with good thermal stability. Through the test of its mechanical properties, the results show that the elongation at break is quite high.
Fabrication of nonspherical particles for gene delivery remains a major challenge. In this study, novel rod‐like nanoparticles are prepared for efficient gene delivery by self‐assembly of α‐cyclodextrin (α‐CD) and polyethylenimine‐methoxy poly(ethylene glycol) (PEI‐mPEG). The study reveals that the rod‐like PEI‐mPEG/α‐CD particles can bind DNA effectively and the resulting PEI‐mPEG/α‐CD/DNA complexes show over four times higher gene delivery capability than their spherical counterparts and PEI(25K) due to more efficient cellular uptake. Furthermore, the cytotoxicity of rod‐like PEI‐mPEG/α‐CD is about five times lower than that of the nanospheres, and 50 times lower than that of DNA/PEI(25K). These results indicate that shape is an important parameter for the design of gene delivery vectors.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Bi 2 O 2 CO 3 is a UV-light-driven photocatalyst. Bi 2 O 2 CO 3 nanoflakes modified with plasmonic Ag nanoparticles (Ag/Bi 2 O 2 CO 3 ) were obtained by a hydrothermal method. In the synthetic process, Ag 2 C 2 O 4 worked as the Ag source and C source for the simultaneous formation of Ag particles and CO[Formula: see text]. The optimum synthesis condition was found at [Formula: see text]C for 16[Formula: see text]h under alkaline condition. The binary heterostructure was then used for degrading 2, 4-Dichlorophenol (2, 4-DCP) and Rhodamine B in visible light, with an efficiency of nearly 80% for 2, 4-DCP and 100% for Rhodamine B after 4[Formula: see text]h and 2[Formula: see text]h reaction, respectively. The binary heterostructure exhibited improved photocatalytic activity compared to that of individual Ag and Bi 2 O 2 CO 3 due to Surface Plasmon Resonance (SPR) effect of Ag. Meanwhile, after five recycling experiments, Ag/Bi 2 O 2 CO 3 showed higher photocatalytic activity and lower performance degradation in comparison with the one prepared by photo-reduction of Ag[Formula: see text] on Bi 2 O 2 CO 3 nanoflakes. This indicated the advantage of one-pot synthetic method. This work is expected to provide an efficient photocatalyst for organic pollutants degradation.
Abstract To achieve the goal of efficient organic pollutants removal, bismuth nanobowl (Bi) /bismuth oxides was rationally designed and synthesized. In the Bi/bismuth oxides, BiOCl/Bi 2 O 2.33 was covered on the surface of Bi nanobowls after etching bowl‐shaped bismuth (previously prepared by solvothermal method with the addition of D‐Fructose) with hydrochloride acid solution. Compared to the one without etching, the obtained Bi/bismuth oxides nanobowls with enlarged surface area lead to remarkable enhancement in dye adsorption. The rhodamine B (RhB) adsorption behavior over the Bi/bismuth oxides samples all fitted pseudo‐second‐order model. Adsorption is a crucial previous step for photocatalysis. Due to the high adsorption capacity and the synergistic effect between surface oxides and plasmonic Bi, the Bi/bismuth oxides nanobowls exhibited high removal efficiency for organic pollutions under visible light irradiation.
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