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172 results on '"Ge, Danhua"'

7. Enhanced oxidative degradation of tetracycline by visible light-promoted g-C3N4 modified Cu3(OH)4SO4/Cu7S4 composites under an air atmosphere.

Author

Wang, Yan, Li, Haoran, Chen, Daqing, Ge, Danhua, and Chen, Xiaojun

Subjects
REACTIVE oxygen species, TETRACYCLINE, TETRACYCLINES, HYDROXYL group, WASTEWATER treatment, SOLAR cells
Abstract

Herein, a simple solvothermal method was used to prepare a CuSx/g-C3N4 (CSG) heterojunction as an efficient oxygen activator containing sulfur vacancies (SVs). The as-prepared catalyst can activate oxygen to effectively degrade tetracycline (TC). The degradation rate of TC (20 mg L−1) reached 98.9% in 90 min over CSG (0.02 g L−1) under an air atmosphere, which maintained good performance within a wide pH range of 6–10. It was almost unaffected by any light source and water quality, indicating a highly efficient oxygen activator and good stability. Moreover, the trapping experiments and EPR results revealed that the main reactive oxygen species (ROSs) were singlet oxygen (1O2) and hydroxyl radicals (˙OH). CSG (4 : 1) enabled the activation of oxygen-produced ROS for removing TC even in the dark, which was in accordance with the EPR results. In addition, the CSG catalyst exhibited a good removal performance in practical wastewater treatment. Our study demonstrated that the CSG catalyst had the potential to remove organic pollutants from wastewater. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Na2S·9H2O Enabled Defluorodisulfuration and Hydrodefluorination of Perfluorobutyl Tetralones: Synthesis of Trifluoromethyl 1,2-Dithioles

Author

Yu, Zi-Lun, Feng, Man-Hang, Zhang, Peng-Yuan, Xu, Hao, Ge, Danhua, Ma, Mengtao, Shen, Zhi-Liang, and Chu, Xue-Qiang

Abstract

An unprecedented defluorocyclization of perfluorobutyl tetralones with Na2S·9H2O was developed for the synthesis of trifluoromethyl 1,2-dithioles, which provided chemists novel access to biologically and pharmaceutically relevant organofluorides. Successive C(sp3)–F bond functionalization at the perfluoroalkyl chain is vital for the formation of four C–H/C–S/S–S bonds and a five-membered S-heterocycle assembly. Cheap, weakly toxic, and odorless inorganic sulfide Na2S·9H2O acts as both a disulfurating precursor and a hydrodefluorinating reagent in this tandem multi-bond-interconverting reaction.

Published
2023
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29. Defect Surface Engineering of Hollow NiCo 2 S 4 Nanoprisms towards Performance-Enhanced Non-Enzymatic Glucose Oxidation.

Author

Lang, Xiaomin, Chu, Dandan, Wang, Yan, Ge, Danhua, and Chen, Xiaojun

Subjects
OXIDATION of glucose, SURFACE defects, DOPING agents (Chemistry), ELECTRODE performance, METAL sulfides, GLUCOSE oxidase, TRANSITION metal oxides
Abstract

Transition metal sulfides have been explored as electrode materials for non-enzymatic detection. In this work, we investigated the effects of phosphorus doping on the electrochemical performances of NiCo2S4 electrodes (P-NiCo2S4) towards glucose oxidation. The fabricated non-enzymatic biosensor displayed better sensing performances than pristine NiCo2S4, with a good sensitivity of 250 µA mM−1 cm−2, a low detection limit (LOD) of 0.46 µM (S/N = 3), a wide linear range of 0.001 to 5.2 mM, and high selectivity. Moreover, P-NiCo2S4 demonstrated its feasibility for glucose determination for practical sample testing. This is due to the fact that the synergetic effects between Ni and Co species, and the partial substitution of S vacancies with P can help to increase electronic conductivity, enrich binary electroactive sites, and facilitate surface electroactivity. Thus, it is found that the incorporation of dopants into NiCo2S4 is an effective strategy to improve the electrochemical activity of host materials. [ABSTRACT FROM AUTHOR]

Published
2022
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39. Facile construction of an Ag/MoSe2 composite based non-enzymatic amperometric sensor for hydrogen peroxide.

Author

Tian, Ran, Li, Dong, Zhou, Tao, Chu, Xue-Qiang, Ge, Danhua, and Chen, Xiaojun

Subjects
AMPEROMETRIC sensors, HYDROGEN peroxide, HYDROGEN detectors, COMPOSITE construction, FOOD science, DETECTION limit
Abstract

We report an electrochemical non-enzymatic method for hydrogen peroxide (H2O2) detection based on Ag nanoparticle-decorated MoSe2 (Ag/MoSe2-500) hybrid nanostructures. These hybrid nanocomposites are easily prepared by in situ reduction of Ag+ on the surface of MoSe2. Benefiting from the strong synergy of Ag nanoparticles and MoSe2 nanosheets in enhancing electrical conductivity, the Ag/MoSe2-500 hybrid nanostructures perform excellent sensing activity for H2O2 electrocatalytic reduction with a wide linear range of 0.02–15.2 mM, a high sensitivity of 400.0 μA mM−1 cm−2 and a low detection limit of 0.39 μM (S/N = 3). Furthermore, the sensor displays satisfactory reproducibility and stability and is applicable for practical quantitative analysis of H2O2 in milk and orange juice samples. In a word, Ag/MoSe2-500 nanocomposites are promising candidates for non-enzymatic H2O2 sensing in the fields of biology and food science. [ABSTRACT FROM AUTHOR]

Published
2022
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42. Efficient improvement in non-enzymatic glucose detection induced by the hollow prism-like NiCo2S4 electrocatalyst.

Author

Chu, Dandan, Yan, Li, Chen, Qiwen, Chu, Xue-Qiang, Ge, Danhua, and Chen, Xiaojun

Subjects
X-ray powder diffraction, TRANSMISSION electron microscopy, GLUCOSE, OXIDATION of glucose, SCANNING electron microscopy, PRISMS
Abstract

Hollow prism-like NiCo2S4 materials (NiCo2S4 HNPs) were successfully fabricated by a two-step method. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and powder X-ray diffraction (XRD) confirmed the morphology and structure of the as-prepared NiCo2S4 nanoprisms. A non-enzymatic sensor based on NiCo2S4 HNPs was constructed with outstanding electrochemical activity towards glucose oxidation in alkaline medium. The sensor showed a rapid response time (∼0.1 s), a high sensitivity of 82.9 μA mM−1 cm−2, a wide linear range (0.005–20.2 mM) and a detection limit of 0.8 μM (S/N = 3) with a good selectivity and reproducibility. Additionally, the proposed electrode also confirmed the feasibility in practical blood serum. These results indicate that NiCo2S4/ITO has great potential in the development of non-enzymatic glucose sensor applications. [ABSTRACT FROM AUTHOR]

Published
2021
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