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supercritical-hydrothermal
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Synthesis of Copper Oxide Nano Particles by Supercritical Hydrothermal Method and Study on Their Adsorption Properties for uptake of Elemental Iodine and Radioactive Ions
, M.Sc. Thesis Sharif University of Technology ; Otukesh, Mohammad (Supervisor) ; Ahmadi, Javad (Supervisor) ; Samadfam, Mohammad (Co-Advisor)
Abstract
I-131 isotope is one of the most significant radio medicines for treatments of the thyroid cancer and nuclear tomography of thyroid. As for purification of this radioisotope several methods have been developed among which adsorption-desorption on metallic copper is the most promising. The current study is aimed at elaboration of the kinetics behavior of the different types of metallic copper for adsorption of iodine vapor. The used copper samples included plain and silica-supported Cu nanoparticles as well as micronized copper. The silica-supported Cu nanoparticles were prepared by impregnation of highly porous silica (≈500 m2/g) in Cu(NO3)2 solution, heating of the solution to above...
Adsorption of lead ions in aqueous solution using Yttrium oxide nanoparticles
, Article Journal of Nano Research ; Volume 16 , 2011 , Pages 83-87 ; 16625250 (ISSN) ; Ahmadi, S. J ; Hosseinpour, M ; Sharif University of Technology
2011
Abstract
By a single-step supercritical hydrothermal synthesis method, yttrium oxide nanoparticles were successfully prepared without additional treatment. Yttrium oxide nanoparticles were employed as an adsorbent to study the adsorption of some heavy metal ions. This study revealed that nano structure yttrium oxide was an effective adsorbent for removal of lead ions from aqueous solutions
Experimental Study and Modelling of Ultrafine Particles Formation by Using the Supercritical Fluids
, Ph.D. Dissertation Sharif University of Technology ; Gotbi, Cyrus (Supervisor) ; Khanchi, AliReza (Supervisor) ; Farhadpour, Farhad (Co-Advisor) ; Dorkoosh, Farid (Co-Advisor)
Abstract
In this research, we focused on demonstration of features and advantages of supercritical fluids technology to formation of fine particles (nano and micro scales) from bulk materials (solid) and synthesized metal oxides nanoparticles. Therefore, using two different fluids, carbon dioxide and water, and two completely different methods, the Rapid expansion of supercritical solution and supercritical hydrothermal, were used to produce fine particles of drug (acetaminophen) and nano metal oxide (zirconium dioxide and bismuth ferrite). The summary of this research are as follows:1. The solubility of acetaminophen in SuperCritical-Carbon Dioxide (SC-CO2) with and without menthol as a cosolvent...