The Experts below are selected from a list of 48 Experts worldwide ranked by ideXlab platform

Sivakumar Manickam - One of the best experts on this subject based on the ideXlab platform.

  • recent advancements in the sonophotocatalysis spc and doped sonophotocatalysis dspc for the treatment of recalcitrant hazardous organic water pollutants
    Ultrasonics Sonochemistry, 2017
    Co-Authors: Debabrata Panda, Sivakumar Manickam
    Abstract:

    Abstract Sonophotocatalysis (SPC) is considered to be one of the important wastewater treatment techniques and hence attracted the attention of researchers to eliminate recalcitrant hazardous organic pollutants from aqueous phase. In general, SPC refers to the integrated use of ultrasonic sound waves, ultraviolet radiation and the addition of a semiconductor material which functions as a photocatalyst. Current research has brought numerous improvements in the SPC based treatment by opting visible light irradiation, nanocomposite catalysts and numerous catalyst supports for better stability and performance. This review accomplishes a critical analysis with respect to the recent advancements. The efficiency of SPC based treatments has been analyzed by considering the individual methods i.e. sonolysis, photocatalysis, sonophotolysis, sono-ozone, photo-Fenton and sono-Fenton. Besides, the essential parameters such as solution temperature, concentrations of initial pollutant and catalyst, initial pH, dosages of Fenton’s reagent and hydrogen peroxide (H 2 O 2 ), ultrasonic power density, gas sparging, addition of radical scavenger, addition of carbon tetrachloride and methanol have been discussed with suggestions for the selection of optimum parameters. A higher synergistic pollutant removal rate has been reported during SPC treatment as compared to individual methods and the implementation of numerous Doping Materials and supports for the photocatalyst enhances the degradation rate of pollutants using DSPC under both visible and UV irradiation. Overall, SPC and DSPC based wastewater treatments are emerging as potential techniques as they provide effective solution in removing the recalcitrant organic pollutants and progressive research is expected to bring out superior treatment efficiency using these advanced technologies. Importance of this review The review has accomplished a thorough and a critical analysis of sonophotocatalysis (SPC) based on the recently published journals. Recent advancements in the doped sonophotocatalysis (DSPC) and the mechanisms behind synergistic enhancement in the pollutant degradation rate have been discussed with justifications. Besides, the possible future works are suggested for the advancements in sonophotocatalysis based treatment. This review will be beneficial for electing a SPC based method because of the accomplished sharp comparisons among the published results. The review includes current advancements of SPC based methods which aid for a low-cost and a large-scale wastewater treatment application.

Sharkeev, Yurii P. - One of the best experts on this subject based on the ideXlab platform.

  • Towards a theory of flow stress in multimodal polycrystalline aggregates. Effects of dispersion hardening
    'AIP Publishing', 2019
    Co-Authors: Čevizović Dalibor, Reshetnyak, Alexander A., Sharkeev, Yurii P.
    Abstract:

    We elaborate the recently introduced theory of flow stress, including yield strength, in polycrystalline Materials under quasi-static plastic deformations, thereby extending the case of single-mode aggregates to multimodal ones in the framework of a two-phase model which is characterized by the presence of crystalline and grain-boundary phases. Both analytic and graphic forms of the generalized Hall-Petch relations are obtained for multimodal samples with BCC (α-phase Fe), FCC (Cu, Al, Ni) and HCP (α-Ti, Zr) crystalline lattices at T=300K with different values of the grain-boundary (second) phase. The case of dispersion hardening due to a natural incorporation into the model of a third phase including additional particles of Doping Materials is considered. The maximum of yield strength and the respective extremal grain size of samples are shifted by changing both the input from different grain modes and the values at the second and third phases. We study the influence of multimodality and dispersion hardening on the temperature-dimensional effect for yield strength within the range of 100-350K. © 2019 Author(s).Conference of International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019 ; 1-5 October 2019; Conference Code:15464

Sharkeev, Yu. P. - One of the best experts on this subject based on the ideXlab platform.

  • Towards a theory of flow stress in multimodal polycrystalline aggregates. Effects of dispersion hardening
    'AIP Publishing', 2019
    Co-Authors: Cevizovic D., Reshetnyak, Alexander A., Sharkeev, Yu. P.
    Abstract:

    We elaborate the recently introduced theory of flow stress, including yield strength, in polycrystalline Materials under quasi-static plastic deformations, thereby extending the case of single-mode aggregates to multimodal ones in the framework of a two-phase model which is characterized by the presence of crystalline and grain-boundary phases. Both analytic and graphic forms of the generalized Hall-Petch relations are obtained for multimodal samples with BCC ($\alpha$-phase Fe), FCC (Cu, Al, Ni) and HCP (Cu, Al, Ni) and HCP ($\alpha$-Ti, Zr) crystalline lattices at $T=300K$ with different values of the grain-boundary (second) phase. The case of dispersion hardening due to a natural incorporation into the model of a third phase including additional particles of Doping Materials is considered. The maximum of yield strength and the respective extremal grain size of samples are shifted by changing both the input from different grain modes and the values at the second and third phases. We study the influence of multimodality and dispersion hardening on the temperature-dimensional effect for yield strength within the range of $150-350K$.Comment: 6 pages, 6 figures, 2 tables, contribution to the Proceedings of the International Conference Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 1-5, October, 2019, Tomsk, Russi

Reshetnyak, Alexander A. - One of the best experts on this subject based on the ideXlab platform.

  • Towards a theory of flow stress in multimodal polycrystalline aggregates. Effects of dispersion hardening
    'AIP Publishing', 2019
    Co-Authors: Cevizovic D., Reshetnyak, Alexander A., Sharkeev, Yu. P.
    Abstract:

    We elaborate the recently introduced theory of flow stress, including yield strength, in polycrystalline Materials under quasi-static plastic deformations, thereby extending the case of single-mode aggregates to multimodal ones in the framework of a two-phase model which is characterized by the presence of crystalline and grain-boundary phases. Both analytic and graphic forms of the generalized Hall-Petch relations are obtained for multimodal samples with BCC ($\alpha$-phase Fe), FCC (Cu, Al, Ni) and HCP (Cu, Al, Ni) and HCP ($\alpha$-Ti, Zr) crystalline lattices at $T=300K$ with different values of the grain-boundary (second) phase. The case of dispersion hardening due to a natural incorporation into the model of a third phase including additional particles of Doping Materials is considered. The maximum of yield strength and the respective extremal grain size of samples are shifted by changing both the input from different grain modes and the values at the second and third phases. We study the influence of multimodality and dispersion hardening on the temperature-dimensional effect for yield strength within the range of $150-350K$.Comment: 6 pages, 6 figures, 2 tables, contribution to the Proceedings of the International Conference Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 1-5, October, 2019, Tomsk, Russi

  • Towards a theory of flow stress in multimodal polycrystalline aggregates. Effects of dispersion hardening
    'AIP Publishing', 2019
    Co-Authors: Čevizović Dalibor, Reshetnyak, Alexander A., Sharkeev, Yurii P.
    Abstract:

    We elaborate the recently introduced theory of flow stress, including yield strength, in polycrystalline Materials under quasi-static plastic deformations, thereby extending the case of single-mode aggregates to multimodal ones in the framework of a two-phase model which is characterized by the presence of crystalline and grain-boundary phases. Both analytic and graphic forms of the generalized Hall-Petch relations are obtained for multimodal samples with BCC (α-phase Fe), FCC (Cu, Al, Ni) and HCP (α-Ti, Zr) crystalline lattices at T=300K with different values of the grain-boundary (second) phase. The case of dispersion hardening due to a natural incorporation into the model of a third phase including additional particles of Doping Materials is considered. The maximum of yield strength and the respective extremal grain size of samples are shifted by changing both the input from different grain modes and the values at the second and third phases. We study the influence of multimodality and dispersion hardening on the temperature-dimensional effect for yield strength within the range of 100-350K. © 2019 Author(s).Conference of International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019 ; 1-5 October 2019; Conference Code:15464

Debabrata Panda - One of the best experts on this subject based on the ideXlab platform.

  • recent advancements in the sonophotocatalysis spc and doped sonophotocatalysis dspc for the treatment of recalcitrant hazardous organic water pollutants
    Ultrasonics Sonochemistry, 2017
    Co-Authors: Debabrata Panda, Sivakumar Manickam
    Abstract:

    Abstract Sonophotocatalysis (SPC) is considered to be one of the important wastewater treatment techniques and hence attracted the attention of researchers to eliminate recalcitrant hazardous organic pollutants from aqueous phase. In general, SPC refers to the integrated use of ultrasonic sound waves, ultraviolet radiation and the addition of a semiconductor material which functions as a photocatalyst. Current research has brought numerous improvements in the SPC based treatment by opting visible light irradiation, nanocomposite catalysts and numerous catalyst supports for better stability and performance. This review accomplishes a critical analysis with respect to the recent advancements. The efficiency of SPC based treatments has been analyzed by considering the individual methods i.e. sonolysis, photocatalysis, sonophotolysis, sono-ozone, photo-Fenton and sono-Fenton. Besides, the essential parameters such as solution temperature, concentrations of initial pollutant and catalyst, initial pH, dosages of Fenton’s reagent and hydrogen peroxide (H 2 O 2 ), ultrasonic power density, gas sparging, addition of radical scavenger, addition of carbon tetrachloride and methanol have been discussed with suggestions for the selection of optimum parameters. A higher synergistic pollutant removal rate has been reported during SPC treatment as compared to individual methods and the implementation of numerous Doping Materials and supports for the photocatalyst enhances the degradation rate of pollutants using DSPC under both visible and UV irradiation. Overall, SPC and DSPC based wastewater treatments are emerging as potential techniques as they provide effective solution in removing the recalcitrant organic pollutants and progressive research is expected to bring out superior treatment efficiency using these advanced technologies. Importance of this review The review has accomplished a thorough and a critical analysis of sonophotocatalysis (SPC) based on the recently published journals. Recent advancements in the doped sonophotocatalysis (DSPC) and the mechanisms behind synergistic enhancement in the pollutant degradation rate have been discussed with justifications. Besides, the possible future works are suggested for the advancements in sonophotocatalysis based treatment. This review will be beneficial for electing a SPC based method because of the accomplished sharp comparisons among the published results. The review includes current advancements of SPC based methods which aid for a low-cost and a large-scale wastewater treatment application.