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170 results on '"Deng, Yuehua"'

2. Electrochemical Corrosion Study of 20MnTiB High Strength Bolt Under the Simulation of Humid Climate in Chongqing

Author

Wen, Juan, Gao, Xianping, Deng, Yuehua, Zhang, Fanglin, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Cui, Zhen-Dong, Series Editor, Mei, Guoxiong, editor, Xu, Zengguang, editor, and Zhang, Fei, editor

Published
2024
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26. Persulfate-enhanced degradation of propranolol over BiOCl0.5I0.5 under visible light irradiation.

Author

Deng, Yuehua, Luo, Jiating, Cao, Hongyu, Chen, Danni, Li, Yani, Che, Qianqian, He, Yan, Gao, Xiang, Hu, Xiaobin, Zhao, Wei, and Wang, Fei

Subjects
*VISIBLE spectra, *HUMIC acid, *PROPRANOLOL, *PHOTOCATALYSTS, *PHOTODEGRADATION, *IRRADIATION, *SOLID solutions
Abstract

The photodegradation of propranolol (PRO) by BiOCl0.5I0.5/persulfate under visible light was comprehensively investigated. The results demonstrated a significant increase in the removal efficiency of PRO under visible light irradiation, achieved by the combination of BiOCl0.5I0.5 solid solution and persulfate (PS). The photocatalytic activity of the system was found to be enhanced with an increase in the pH value. Additionally, the addition of a certain amount of PS improved the degradation of PRO. The presence of typical water constituents, Cl− and NO3−, had a negligible impact on PRO removal. In contrast, the increasing concentration of humic acid (HA) exhibited apparent inhibition of PRO degradation. Furthermore, radical scavenging experiments revealed that the removal of PRO was primarily facilitated by active free species, including h+ and ˙O2−. The presence of characteristic peaks of ˙OH (peak ratio 1 : 2 : 2 : 1), 1O2 and ˙SO4− in the EPR spectrum indicates that these three radicals are also involved in the degradation process. Moreover, the BiOCl0.5I0.5/PS system demonstrated excellent photocatalytic activity, as well as favorable reusability and stability. This study offers new insights into the photocatalytic degradation of PRO, presenting a promising approach in this field. [ABSTRACT FROM AUTHOR]

Published
2024
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30. Benoxazolone-based ionic liquid catalyzed C–S bond construction for synthesis of benzothiazoles from 2-aminothiophenols and CO2 under ambient conditions.

Author

Gao, Xiang, Zhao, Jiajia, Gao, Ying, Deng, Yuehua, Shi, Yi, He, Jia, and Li, Yanrui

Subjects
IONIC liquids, ATMOSPHERIC pressure, BENZOXAZOLES, RING formation (Chemistry), FEEDSTOCK
Abstract

The green synthesis of sulfur-containing compounds via the use of CO2 as a C1 feedstock to build C–S bonds is an attractive topic. Although a few implementations for this route have been reported, the transformation of CO2 at ambient conditions remains a great challenge. In this work, a novel benoxazolone-based ionic liquid (i.e., tetrabutylphosphonium benoxazolone, [P4444][Benoxa]) was discovered, which could efficiently catalyze the synthesis of benzothiazoles via the cyclization of 2-aminothiophenols with CO2 in the presence of hydrosilanes at atmospheric pressure and room temperature (e.g., 30 °C, 0.1 MPa). The catalytic protocol was applicable to various 2-aminothiophenols bearing electron-withdrawing or electron-donating substituents, affording the corresponding benzothiazoles in good-to-excellent yields. To the best of our knowledge, this is the first example of the synthesis of benzothiazoles using CO2 under solvent-free and ambient conditions. [ABSTRACT FROM AUTHOR]

Published
2023
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50. Multi-arc ion plating and DC magnetron sputtering integrated technique for high-performance Al,C-co-doped δ-TiN quaternary films

Author

Liu Hua, Wen Kang, Xin Ren, Wang Zhijian, Huang Meisong, Zhao Ruishan, and Deng Yuehua

Subjects
Materials science, 020209 energy, General Chemical Engineering, Direct current, Ion plating, chemistry.chemical_element, 02 engineering and technology, General Chemistry, Sputter deposition, 021001 nanoscience & nanotechnology, Corrosion, Crystal, chemistry, 0202 electrical engineering, electronic engineering, information engineering, General Materials Science, Composite material, 0210 nano-technology, Tin, Polarization (electrochemistry), Ternary operation
Abstract

A new approach was adopted to integrate the promising performances of TiAlN and TiCN ternary films for applications in extreme environments. In this study, Al,C-co-doped δ-TiN films, that is, TiAlCN quaternary films, were fabricated using a novel multi-arc ion plating and direct current (DC) magnetron sputtering (MIP&DCMS) integrated technique. The sandwich-like gradient architecture of the TiAlCN quaternary films altered the columnar crystal nature of the δ-TiN matrix and yielded fine grains, finally producing a heterophase composite structure. This structure contributed to its high microhardness (36.8 ± 1.6 GPa) and elastic modulus (410 ± 22 GPa) while maintaining superior tribological characteristics, with a friction coefficient of 0.26 ± 0.03. The TiAlCN quaternary films provided excellent corrosion resistance to SS304 with a corrosion current density of 0.129 ± 0.116 μA cm−2 and a polarization resistance of 430.5 ± 10.56 kΩ cm2, which are comparable to those of emerging TiAlN and TiCN ternary films.

Published
2021

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