The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Francesco Bellucci - One of the best experts on this subject based on the ideXlab platform.
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Passive films on stainless steels after Gamma-Ray Irradiation, as studied by electrochemical impedance spectroscopy
Corrosion Science, 1993Co-Authors: G. Capobianco, G. Sandona, Tullio Monetta, Francesco BellucciAbstract:Abstract The physical structure of the passive film formed by anodization on 446 stainless steel has been investigated by the Electrochemical Impedance Spectroscopy technique, before and after galvanostatic reduction in de-aerated borate/boric acid buffer solution or Gamma-Ray Irradiation in bidistilled water. On the basis of appropriate models, the results obtained indicate that after galvanostatic reduction the passive film is composed of two layers, the external one showing a porous structure. After Gamma-Ray Irradiation, the passive film seems thinner, with a homogeneous rather than porous structure.
Chulhwan Park - One of the best experts on this subject based on the ideXlab platform.
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Gamma ray Irradiation for sludge solubilization and biological nitrogen removal
Radiation Physics and Chemistry, 2011Co-Authors: Tak-hyun Kim, Myun-joo Lee, Chulhwan ParkAbstract:Abstract This study was conducted to investigate the effects of gamma ray Irradiation on the solubilization of waste sewage sludge. The recovery of an organic carbon source from sewage sludge by gamma ray Irradiation was also studied. The gamma ray Irradiation showed effective sludge solubilization efficiencies. Both soluble chemical oxygen demand (SCOD) and biochemical oxygen demand (BOD5) increased by gamma ray Irradiation. The feasibility of the solubilized sludge carbon source for a biological nitrogen removal was also investigated. A modified continuous bioreactor (MLE process) for a denitrification was operated for 20 days by using synthetic wastewater. It can be concluded that the gamma ray Irradiation was useful for the solubilization of sludge and the recovery of carbon source from the waste sewage sludge for biological nitrogen removal.
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carbon source recovery from waste activated sludge by alkaline hydrolysis and gamma ray Irradiation for biological denitrification
Bioresource Technology, 2009Co-Authors: Chulhwan ParkAbstract:The recovery of an organic carbon source from a waste activated sludge by using alkaline hydrolysis and radiation treatment was studied, and the feasibility of the solubilized sludge carbon source for a biological denitrification was also investigated. The effects of an alkaline treatment and Gamma-Ray Irradiation on a biodegradability enhancement of the sludge were also studied. A modified continuous bioreactor for a denitrification (MLE reactor) was operated by using a synthetic wastewater for 47 days. Alkaline treatment of pH 10 and Gamma-Ray Irradiation of 20 kGy were found to be the optimum carbon source recovery conditions. COD removal of 84% and T-N removal of 51% could be obtained by using the solubilized sludge carbon source through the MLE denitrification process. It can be concluded that the carbon source recovered from the waste activated sludge was successfully employed as an alternative carbon source for a biological denitrification.
Junqi Jiang - One of the best experts on this subject based on the ideXlab platform.
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Effects of gamma ray Irradiation on poly(acrylonitrile-co-methyl acrylate) fibers
Polymer Degradation and Stability, 2016Co-Authors: Liangxiao Zhou, Weizhe Zhao, Changling Yang, Junqi JiangAbstract:Abstract Gamma ray Irradiation on PAN fibers did bring some benefits for the successive stabilization, however, it is still unclear about the structure of crosslinked bonds, effects of atmosphere and chain scission as well as initiation of cyclization. In this work, PAN fiber as well as a PAN solution was irradiated under different atmospheres. The structure of crosslinked bonds, molecular weights and thermal reactivity were analyzed. It is discovered that gamma ray Irradiation on PAN brought chains crosslinking and scission as long as cyclization. The large amount of crosslinked bonds were discovered to be –C N–N C–, while oxygen inhibited nitriles crosslinking. The crosslinking structure rather than remained radicals initiated cyclization during thermal treatment, which was broken and reproduced polyimine radicals at higher temperature.
G. Capobianco - One of the best experts on this subject based on the ideXlab platform.
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Passive films on stainless steels after Gamma-Ray Irradiation, as studied by electrochemical impedance spectroscopy
Corrosion Science, 1993Co-Authors: G. Capobianco, G. Sandona, Tullio Monetta, Francesco BellucciAbstract:Abstract The physical structure of the passive film formed by anodization on 446 stainless steel has been investigated by the Electrochemical Impedance Spectroscopy technique, before and after galvanostatic reduction in de-aerated borate/boric acid buffer solution or Gamma-Ray Irradiation in bidistilled water. On the basis of appropriate models, the results obtained indicate that after galvanostatic reduction the passive film is composed of two layers, the external one showing a porous structure. After Gamma-Ray Irradiation, the passive film seems thinner, with a homogeneous rather than porous structure.
Ziyu Liu - One of the best experts on this subject based on the ideXlab platform.
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gamma ray Irradiation to accelerate crystallization of mesoporous zeolites
Angewandte Chemie, 2020Co-Authors: Xinqing Chen, Minghuang Qiu, Chengguang Yang, Lei Shi, Shiju Zhou, Ziyu Liu, Nannan Sun, Kun Zhang, Hui Wang, Mouhua WangAbstract:Gamma-Ray (Gamma-Ray) Irradiation was introduced into zeolite synthesis. The crystallization process of zeolite NaA, NaY, Silicalite-1, and ZSM-5 were greatly accelerated. The crystallization time of NaA zeolite was significantly decreased to 18 h under Gamma-Ray Irradiation at 20 degrees C, while more than 102 h was needed for the conventional process. Unexpectedly, more mesopores were created during this process, and thus the adsorption capacity of CO2 increased by 6-fold compared to the NaA prepared without Gamma-Ray Irradiation. Solid experimental evidence and density function theory (DFT) calculations demonstrated that hydroxyl free radicals (OH*) generated by Gamma-Rays accelerated the crystallization of zeolite NaA. Besides NaA, mesoporous ZSM-5 with MFI topology was also successfully synthesized under Gamma-Ray Irradiation, which possessed excellent catalytic performance for methanol conversion, suggesting the universality of this new synthetic strategy for various zeolites.
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Gamma‐Ray Irradiation to Accelerate Crystallization of Mesoporous Zeolites
Angewandte Chemie (International ed. in English), 2020Co-Authors: Xinqing Chen, Minghuang Qiu, Chengguang Yang, Lei Shi, Shiju Zhou, Ziyu LiuAbstract:Gamma-Ray (Gamma-Ray) Irradiation was introduced into zeolite synthesis. The crystallization process of zeolite NaA, NaY, Silicalite-1, and ZSM-5 were greatly accelerated. The crystallization time of NaA zeolite was significantly decreased to 18 h under Gamma-Ray Irradiation at 20 degrees C, while more than 102 h was needed for the conventional process. Unexpectedly, more mesopores were created during this process, and thus the adsorption capacity of CO2 increased by 6-fold compared to the NaA prepared without Gamma-Ray Irradiation. Solid experimental evidence and density function theory (DFT) calculations demonstrated that hydroxyl free radicals (OH*) generated by Gamma-Rays accelerated the crystallization of zeolite NaA. Besides NaA, mesoporous ZSM-5 with MFI topology was also successfully synthesized under Gamma-Ray Irradiation, which possessed excellent catalytic performance for methanol conversion, suggesting the universality of this new synthetic strategy for various zeolites.
