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583 results on '"Yuan, Hongming"'

78. Catalytic degradation of "trinitrogen" by Fe-Ce-SiO2 /TiO2 aerogel.

Author

Li, Jie, Yang, Yuxiang, Han, Zhiyong, Huang, Yan, Yuan, Hongming, and Ni, Chaoying

Subjects
AEROGELS, NITROGEN, SEWAGE, BODIES of water, LAMINATED metals, INDUSTRIAL wastes, ATMOSPHERIC nitrogen
Abstract

The "trinitrogen" [ammonia nitrogen (NH4+ − N), nitrate nitrogen (NO3− − N), and nitrite nitrogen (NO2− − N)] from industrial or domestic wastewater can lead to eutrophication of water bodies. When ammonia nitrogen is converted into nitrate nitrogen, it will cause high nitrogen oxygen demand, which will also lead to hyperammonemia. High nitrite content in water bodies will increase the risk of human cancer. In this paper, Fe-Ce bimetallic-doped composites (Fe-Ce/SiO2 and Fe-Ce-SiO2/TiO2) were synthesized using SiO2 aerogel as a carrier for the adsorption and degradation of "three nitrogen." SiO2/TiO2 was prepared by dipping method, and Fe and Ce bimetals were loaded on the surface of SiO2/TiO2 material, and the effect of photo-Fenton oxidation on the degradation rate of three nitrogen under different materials was explored. The results showed that when the dosage of catalyst was 0.01 g, pH value was 11.0, and the concentration of H2O2 was 80 mmol/L, the photocatalytic efficiency was the best, and the degradation efficiency of three nitrogen remained above 70%. [ABSTRACT FROM AUTHOR]

Published
2023
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83. Preparation of Fe3O4@Fe(0) immobilized enzyme to enhance the efficient degradation of methoxychlor.

Author

Bai, He, Yang, Yuxiang, Yuan, Hongming, Liu, Xiangnong, and Ni, Chaoying

Subjects
IMMOBILIZED enzymes, METHOXYCHLOR, ENVIRONMENTAL remediation, LACCASE, SEWAGE
Abstract

The presence of methoxychlor (MXC) in soil and wastewater is considered a nonnegligible environmental threat. Herein, Fe3O4@Fe(0) was obtained by NaBH4 reduction of Fe3O4 nanoparticles and served as a carrier for laccase to construct catalyst. The catalyst was evaluated for the degradation of MXC in treated wastewater and soil with 2, 2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) being used as cocatalyst. The removal rate of MXC in wastewater and soil was found to be 89% and 88% in optimum conditions, and the influences of initial MXC concentration, pH, and temperature on the degradation rate were evaluated. The metabolites including 2-methylpentane, 3-methylpentane, and n-pentane of MXC were identified, and possible degradation mechanisms were proposed. Overall, this work successfully demonstrates not only the ability to degrade MXC in different circumstances but also provides a new idea for environmental remediation in the future. [ABSTRACT FROM AUTHOR]

Published
2023
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97. Effects of different pore structures on loading and sustained-release of mitomycin C by hollow mesoporous Fe(0)@mSiO2.

Author

Chang, Ziling, Li, Huafei, Yang, Yuxiang, Yuan, Hongming, Huang, Yan, Yao, Pingping, and Ni, Chaoying

Abstract

Herein, we developed the dual-function template method to fabricate hollow magnetic nano-spheres (denoted as HMFe–Si–Cn, n = 16, 18) with a mesoporous shell and hollow interior structure using alkyl chain trimethoxysilane templating. The shorter chain template directed formation of HMFe–Si–C16 with size of 119 nm, having disordered inkbottle type mesopores and saturation magnetization of 50.01 emu/g higher than that of HMFe–Si–C18 with cylindrical type mesopores. In addition, the HMFe–Cn loaded with MMC diaplays a pH and magnetic dual responsive drug release behavior. By contrast, Mitomycin C (MMC) loading efficiency of HMFe–Si–C16 was higher owing to the fact that the pore size, surface area, and pore volume of HMFe–Si–C16 were larger than those of HMFe–Si–C18. Besides, MMC loaded HMFe–Si–Cn hollow spheres showed a clear pH-dependent drug release behavior, having a higher release rate in acidic environments of pH 5.7. For the pH 5.7 and 7.4 release, the release kinetic for HMFe–Si–C16–MMC composites follows pseudo-first-order attributable to its special pore structure. With Fe(0) as a core, HMFe–Si–Cn is distinguished for higher magnetic properties, and it is more conducive to magnetic targeted treatment of cancer cells and can release drugs through external magnetic field. In addition, HMFe–Si–Cn has lower cytotoxicity and better biocompatibility. For this reason the inner cavity of HMFe–Si–C16 could be labeled with radioisotope 99Tcm to study the magnetic targeting distribution of HMFe–Si–C16 in vivo, and its cytotoxicity against in vitro HeLa cells was also studied. These results indicate the potential of HMFe–Si–C16 in the magnetic targeted drug delivery system. [ABSTRACT FROM AUTHOR]

Published
2022
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