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10 results on '"Hu, Chang-xing"'

4. Minireview and Perspective of One-Dimensional Manganese Oxide Nanostructures for the Removal of Air Pollutants

Author

Hu, Chang-xing, Wei, Lin-gang, Wu, Tong, Yue, Chun-mei, and Guo, Rui-tang

Abstract

With the continuous expansion of the industrial production scale and the rapid development of urbanization, ecological damage and environmental pollution caused by air pollutants have become a non-negligible problem in human society. Catalytic technology is one of the most promising and environmentally friendly measures in the past few decades to deal with airborne pollutants. The exploitation and research of efficient and low-cost catalysts is the determining element for the development of the catalytic oxidation process. One-dimensional (1D) manganese oxide shows high activity, selectivity, and stability, which gives credit to the excellent redox ability and surface acidy of MnOx. Additionally, the defect sites, acid–base characteristics, and valence state of the element are all modulated by the 1D morphologies of these catalysts. As a result, they have been widely employed to reduce air pollution. In this paper, the fabrication process of manganese oxide nanowires, nanorods, and nanosheets is reviewed in detail. Second, we briefly summarize the application of 1D manganese oxide nanostructures for the removal of nitrogen oxides, volatile organic compounds, carbon monoxide, ozone, and other pollutants. Finally, several approaches were proposed for the future research directions of one-dimensional manganese oxide nanostructures, hoping to narrow the gap between the novel manganese oxide-based catalysts and the actual demands and to realize commercialized application in the nearest future.

Published
2023
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9. Treatment of wastepaper pulp wastewater by heterogeneous photo-Fenton process.

Author

XU Mei-juan, WANG Qi-shan, and HU Chang-xing

Subjects
HETEROGENEOUS catalysis, GOETHITE, WASTEWATER treatment, WASTE paper, SEWAGE purification, ORGANIC compounds
Abstract

In order to treat wastepaper pulp wastewater effectively, the treatment of wastepaper pulp wastewater using H2O2/goethite heterogeneous catalytic oxidation process has been carried out. It has been proved that the goethite and H2O2 have coordinated effect on the degradation of organic compounds. The optimum goethite dose and pH are 200 mgFe/L and 3.0 respectively, and the dose of H2O2 should not exceed 1500 mg/L. TOC removal of 67% can be obtained by treatment for 90 min under the optimum conditions. High temperature is an advantage of increasing the TOC removal. The reuse of goethite can obtain high TOC removal as well. In the reaction solution, the heterogeneous reaction is the major reaction. The maximal rate constant and the shortest half life are obtained with goethite of 200 mgFe/L and H2O2 of 500 mg/L. The H2O2/goethite heterogeneous catalytic oxidation process is highly effective for the treatment of wastepaper pulp wastewater. [ABSTRACT FROM AUTHOR]

Published
2009

10. Effects of transforming growth factor-beta1 and signal protein Smad3 on rat cardiomyocyte hypertrophy.

Author

Huang J, Qin GH, Hu CX, Gong LY, Cheng FZ, Ma YX, and Lu ZY

Subjects
Animals, Aortic Coarctation metabolism, Cells, Cultured, Leucine metabolism, Male, RNA, Messenger analysis, Rats, Rats, Sprague-Dawley, Smad3 Protein, Transforming Growth Factor beta genetics, Transforming Growth Factor beta1, Cardiomegaly etiology, DNA-Binding Proteins physiology, Trans-Activators physiology, Transforming Growth Factor beta physiology
Abstract

Background: SMAD proteins have recently been identified as the first family of putative transforming growth factor-beta1 (TGF-beta1) signal transducers. This study was to investigate the effects of TGF-beta1 and signal protein Smad3 on rat cardiac hypertrophy., Methods: The incorporation of [(3)H]-leucine was measured to determine the hypertrophy of cardiomyocyte incubated with different doses of TGF-beta1 in cultured neonatal cardiomyocytes. The model of rat cardiac hypertrophy was produced with constriction of the abdominal aorta. At different times after the operation, rats were killed, and their left ventricular mass index (LVMI) determined. The mRNA expression of TGF-beta1 and Smad3 of cultured cells and hypertrophic left ventricles were assessed by RT-PCR. The protein expression of Smad3 was assessed by Western blot., Results: In cultured neonatal cardiomyocytes, TGF-beta1 significantly promoted incorporation of [(3)H]-leucine. With the concentration of 3 pg/L, it increased the expression of Smad3 in mRNA and protein levels after 15 minutes, and continued for up to 8 hours of cultured cardiomyocytes. The LVMI and the expression of TGF-beta1 (mRNA) and Smad3 (mRNA and protein) of hypertrophic left ventricle were increased by day 3 after the operation and continued to the 4th week. The peak expression of these was in the second week after operation., Conclusion: TGF-beta1 has positive effects on rat cardiomyocyte hypertrophy. Signal protein Smad3 could be related to the pathologic progression of rat cardiac hypertrophy.

Published
2004

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