In this work, Waste pine nut shells were used as organic carbon source of biomass to synthesize carbon quantum dots. A highly responsive and selective fluorescent nanosensor (Si-doped biomass-derived carbon dots with molecular imprinted polymers, Si-CDs@MIPs) was designed for determination of Rutin (RT) in Chinese herbal substances like Sophora japonica L..
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January 2024
The purpose of this study is to explore the possibility of using graphene-zinc oxide-hydroxyapatite (GO/ZnO/nHAp) composite microspheres as bone regeneration materials by making use of the complementary advantages of nanocomposites, so as to provide reference for the clinical application of preventing and solving bacterial infection after implantation of synthetic materials. Firstly, GO/ZnO composites and hydroxyapatite nanoparticles were synthesized using the hydrothermal method, and then GO/ZnO/nHAp composite microspheres were prepared via high-temperature sintering. The graphene-zinc oxide-calcium phosphate composite microspheres were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), energy dispersion spectroscopy (EDS), water contact angle measurement, degradation and pH determination, and differential thermal analysis (DiamondTG/DTA).
View Article and Find Full Text PDFMicromachines (Basel)
November 2023
By using melamine as a precursor for the copolymerization process, g-CN and g-CN/TCNQ/Eu complexes with various amounts of doping were created. These complexes were then examined using XRD, FT-IR, SEM, TEM, XPS, PL, UV-vis, and I-T. The degradation rates of pefloxacin (PEF), enrofloxacin (ENR), and ciprofloxacin (CIP) were 91.
View Article and Find Full Text PDFMicromachines (Basel)
November 2023
N- and S-doped CQDs were prepared using L-cysteine as a precursor. Different NS-CQDs/g-CN composite photocatalysts were formed by modifying graphite-phase carbon nitride with different contents of NS-CQDs using a hydrothermal method. The morphology, constituent elements and functional groups of the composite photocatalysts were analyzed by SEM, EDS, TEM, Mapping, XRD and FT-IR as a proof of its successful preparation.
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July 2023
Using an ultrasound-assisted chemical technique, ZnO quantum dot and ZnO composites were created. The optical characteristics and structural details of these composites were examined using TEM, XRD, XPS, FT-IR, UV-vis, and BET. The results revealed that both the ZnO quantum dot composite and ZnO composite exhibited outstanding optical properties, making them suitable for photocatalytic reactions.
View Article and Find Full Text PDFThe naphthalene derivative fluorescent probe F6 was synthesized and a 1 × 10 mol/L solution of Al and other metals to be tested was prepared for the subsequent experiments. The Al fluorescence system of the naphthalene derivative fluorescent probe F6 was successfully constructed as demonstrated by fluorescence emission spectroscopy. The optimal time, temperature and pH of the reaction were investigated.
View Article and Find Full Text PDFIn this paper, the fluorescence properties of ZnOQD-GO-g-CN composite materials (ZCGQDs) were studied. Firstly, the addition of a silane coupling agent (APTES) in the synthesis process was explored, and it was found that the addition of 0.04 g·mL APTES had the largest relative fluorescence intensity and the highest quenching efficiency.
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April 2023
g-CN and g-CN/TCNQ composites with different doping levels were prepared using the copolymerization thermal method with melamine as a precursor. XRD, FT-IR, SEM, TEM, DRS, PL, and I-T characterized them. The composites were successfully prepared in this study.
View Article and Find Full Text PDFTo improve the photocatalytic activity of g-CN, graphitic phase carbon nitride was prepared using melamine as the substrate and modified with PPy and Ag nanoparticles. The structure, morphology, and optical properties of the photocatalysts were investigated using various characterization methods such as XRD, FT-IR, TEM, XPS, and UV-vis DRS. The degradation of fleroxacin, a common quinolone antibiotic, was isolated and measured using the HPLC-MS/MS technique to trace its intermediates and deduce the main degradation pathways.
View Article and Find Full Text PDFRecent studies have shown that the composite of semiconductor photocatalytic materials and g-CN can effectively inhibit photocatalytic carrier recombination and enhance the adsorption performance of the composite photocatalytic materials, so that the composite photocatalyst has stronger photocatalytic activity. In this paper, three kinds of graphitic carbon nitride photocatalyst g-CN with different morphologies were prepared using the same precursor system by the chemical cracking method. After characterization and application, the sample with the most significant photocatalytic activity was selected and the g-CN/BiVO heterostructure was synthesized by the simple solvent evaporation method, then the photocatalytic experiment was carried out.
View Article and Find Full Text PDFZ-scheme heterojunction photocatalytic nanomaterial designs have attracted attention due to their high catalytic performance. Deep eutectic solvents (DESs) have been used as green, sustainable media, acting as solvents and structure inducers in the synthesis of nanomaterials. In this work, a novel visible-light-absorption-enhanced bismuth vanadate/bismuth oxychloride/sulfur, nitrogen co-doped graphene quantum dot (BiVO/BiOCl/S,N-GQDS) heterojunction photocatalyst was prepared in a deep eutectic solvent.
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May 2022
In this work, a CdTe quantum dot-based fluorescent probe was synthesized to determine felodipine (FEL). The synthesis conditions, structure, and interaction conditions with FEL of CdTe quantum dots were analysed by fluorescence spectrophotometry, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), UV-visible spectroscopy, and TEM. The CdTe QD concentration was 2.
View Article and Find Full Text PDFIn this study, Pt-substituted polyoxometalate was first modified on the surface of commercially available TiO, forming an efficient photocatalyst with high reactivity for hydrogen evolution. During the photocatalytic process, Pt-polyoxometalates not only increase the mobility rate of electrons but also improve the separation efficiency of photoinduced electrons and holes. After photoreduction, the in situ generated Pt species are anchored on the surface of polyoxometalate anion, which prevents further agglomeration.
View Article and Find Full Text PDFWe aimed to investigate the absorption-enhancing effect (AEE) of caproyl-modified G2 PAMAM dendrimer (G2-AC) on peptide and protein drugs via the pulmonary route. In this study, G2 PAMAM dendrimer conjugates modified with caproic acid was synthesized, the pulmonary absorption of insulin as models with or without G2-AC were evaluated. The results indicated that G2-AC6 exhibited a greatest AEE for insulin in various caproylation levels of G2-AC.
View Article and Find Full Text PDFThe absorption-enhancing effects of glycol chitosan modified by 5β-cholanic acid nanoparticles (5β-CHA/GC-NPs) on a drug with poor absorption in the intestine were studied by the method of in situ closed loop. We chose fluorescein isothiocyanate-labeled dextrans (FDs) and insulin as the model drugs. 5β-CHA/GC-NPs loaded to different drugs were prepared by the dialysis method, and the physicochemical characteristics and in vitro release profiles of nanoparticles were also estimated.
View Article and Find Full Text PDFIn search of an effective and less toxic absorption enhancer, we synthesized primary amine acetylation of generation 2 polyamidoamine (G2 PAMAM) dendrimer (Ac-G2) by the reaction of G2 PAMAM dendrimer with acetic anhydride, and evaluated the effects of Ac-G2 on the intestinal absorption of poorly absorbable water-soluble drugs using an in situ closed-loop method in rats. The results indicated that Ac50-G2 had a greatest absorption enhancing effect for 5(6)-carboxyfluorescein (CF) in various acetylation levels of G2 PAMAM dendrimers. Ac50-G2 with various concentrations (0.
View Article and Find Full Text PDFAn oxidase-like mimic system based on facilely synthesized Ag@Ag3PO4 microcubes (Ag@Ag3PO4MCs) was designed and utilized to detect mercury ions with high selectivity and ultrasensitivity. Ag@Ag3PO4MCs with an average size of ca. 1.
View Article and Find Full Text PDFSpectrochim Acta A Mol Biomol Spectrosc
September 2009
Rare earth complex Tb(DPC)(2)2H(2)O was synthesized by introducing Pyridine-2,6-dicarboxylic acid(H(2)DPC) as the ligand and characterized by UV, fluorescent and infrared spectra as well as elemental analysis. The complex exhibited ligand-sensitized green emission, and it has the higher sensitized luminescent efficiency and longer lifetime. The effect and mechanism of the ligand (H(2)DPC) on the luminescence properties of terbium complex was discussed.
View Article and Find Full Text PDFSpectrochim Acta A Mol Biomol Spectrosc
February 2009
Eu(3+) (or Tb(3+)) of 3,5-dinitrobenzoic acid and 1,10-phenanthroline ternary rare earth complexes were synthesized and characterized by thermal analysis, infrared spectroscopy, elemental analysis and fluorescence spectroscopy. In this study an organic-inorganic combined device indium tin oxide/poly(N-vinylcar-bazole):RE(3,5-DNBA)(3)Phen:TiO(2)/Al was fabricated. The nano-TiO(2) has been used in the luminescence layer to change the electroluminescence property of RE(3,5-DNBA)(3) Phen (RE=Eu(3+)or Tb(3+)).
View Article and Find Full Text PDFSpectrochim Acta A Mol Biomol Spectrosc
August 2008
The binary complex of Tb(III) with N-phenylanthranilic acid (N-HPA) was synthesized, and the ternary complexes were synthesized by introducing 1,10-phenanthroline (Phen), 2,2'-dipyridyl (Bipy), trioctylphosphine oxide (TPPO) as the second ligand, respectively. These complexes were characterized by infrared spectra, UV spectra and fluorescence spectra. The effect and mechanism of different second ligands on the fluorescent intensity of the terbium N-phenylanthranilic acid complexes was discussed.
View Article and Find Full Text PDFSpectrochim Acta A Mol Biomol Spectrosc
July 2008
Rare-earth ternary complexes Tb(1-x)Eu(x)(m-NBA)(3)Phen (X=1, 0.25, 0.5, 0.
View Article and Find Full Text PDFSpectrochim Acta A Mol Biomol Spectrosc
October 2007
Rare-earth ternary complexes Eu(X)Y(1-X)(TTA)3Dipy {X=0, 0.1, 0.25, 0.
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