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S. A. Alavi H. Zilouei K. Zargoosh A. Asadinezhad A. Yousefi Abdolmaleki 《International Journal of Environmental Science and Technology》2018,15(5):993-1000
Surface modification of two algal biomasses, Nizimuddinia zanardini and Stoechospermum marginatum, using 4-phenyl-3-thiosemicarbazide ligand was performed to investigate the consequences on the adsorption of heavy metals from aqueous solution. Stabilization of amino group of 4-phenyl-3-thiosemicarbazide on the surface of biomasses was confirmed using Fourier transform infrared spectroscopy. Chemical modification was found to exert significant positive effects on biosorption. Adsorption capacities for Pb(II), Cd(II) and Cr(VI) using modified N. zanardini were observed to be 19.3, 16.75 and 15.75 mg/g, respectively, compared to 17.48, 14.18 and 11.85 mg/g for raw N. zanardini biomass. Also, adsorption of Pb(II), Cd(II) and Cr(VI) by the modified S. Marginatum was found to be 17.54, 15.62 and 14.77 mg/g, respectively, in comparison with that of the raw biomass which were 16.86, 12.9 and 11.2 mg/g. The obtained results of the equilibrium adsorption were studied through different isotherm models of Langmuir, Freundlich and Temkin, where the Langmuir model was observed to agree well with the results. Prevalent kinetic models including pseudo-second order and intra-particle diffusion were applied, and the pseudo-second order was found to describe the adsorption kinetics data adequately. Intra-particle model was also utilized in order to show penetration of metal ions, where it was realized that the biosorption took place in two or three steps including film diffusion, molecular diffusion and chemical reaction. 相似文献
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In the present work, we reconstruct different f (T)-gravity models corresponding to the original and entropy-corrected versions of the holographic and new agegraphic dark energy models. We also obtain the equation of state parameters of the corresponding f(T)-gravity models. We conclude that the original holographic and new agegraphic f (T)-gravity models behave like the phantom or quintessence model, whereas in the entropy-corrected models, the equation of state parameter can justify the transition from the quintessence state to the phantom regime as indicated by the recent observations. 相似文献
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K. Karami M. Jamil M. Roos S. Ghaffari A. Abdolmaleki 《Astrophysics and Space Science》2012,340(1):175-184
We study the entropy-corrected version of the new agegraphic dark energy (NADE) model and dark matter in a spatially non-flat Universe and in the framework of Hořava-Lifshitz cosmology. For the two cases containing noninteracting and interacting entropy-corrected NADE (ECNADE) models, we derive the exact differential equation that determines the evolution of the ECNADE density parameter. Also the deceleration parameter is obtained. Furthermore, using a parametrization of the equation of state parameter of the ECNADE model as ω Λ(z)=ω 0+ω 1 z, we obtain both ω 0 and ω 1. We find that in the presence of interaction, the equation of state parameter ω 0 of this model can cross the phantom divide line which is compatible with the observation. 相似文献
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Stabilization of rock slopes using geogrid boxes 总被引：1，自引：0，他引：1
The effect of using geogrid boxes as a new approach for reinforcement of rock slopes (with a case study at rock slope perched along km 11?+?060 of Mianeh–Ardabil railway track) was investigated. The limit equilibrium (LE) and finite element (FE) analysis were conducted to predict the response of the slope to a broad range of possible conditions, namely dry, half saturated, and saturated states as well as static and quasi-static conditions. The objective is to contribute towards the establishment of best practice in the design and construction of engineered slopes. Various design considerations were developed to investigate the effect of varying height and width of geogrid boxes on the factor of safety. The LE and FE based methods were compared based on the factor of safety. The results demonstrated that considering the design consideration, installing geogrids yields increasing the stability of rock slope. 相似文献
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We study the correspondence between the interacting new agegraphic dark energy and the polytropic gas model of dark energy
in the non-flat FRW universe. This correspondence allows us to reconstruct the potential and the dynamics for the scalar field
of the polytropic model, which describe accelerated expansion of the universe. 相似文献
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