نتایج جستجو برای: thorium iv

تعداد نتایج: 181067  

Journal: :Journal of Radioanalytical and Nuclear Chemistry 2021

In this study, a series of macroporous polyacrylamide-based monoliths bearing negatively charged interaction sites were synthesized as adsorbents for effective removal Th4+ from aqueous solutions. The effects solution pH, contact time, monolith dosage, initial concentration, and temperature on adsorption process was studied. Langmuir, Freundlich, Dubinin–Raduskevich isotherms applied to describ...

Journal: :Environmental science. Processes & impacts 2014
Saifeldin M Siddeeg Nicholas D Bryan Francis R Livens

The spatial distribution of (238)U-series radionuclides, specifically 238U, 234U, 230Th and 226Ra, has been determined in stream sediments from Edale, Derbyshire, United Kingdom, to explore the behaviour of U-series radionuclides during weathering. For uranium and thorium, two different extraction methods were used, total dissolution with HNO3/HF in a microwave and leaching with aqua regia. Thi...

2004
G. L. FOGLI E. LISI A. PALAZZO A. M. ROTUNNO

The Kamioka Liquid scintillator Anti-Neutrino Detector (KamLAND) is collecting antineutrino events generated by nuclear reactors and by Thorium and Uranium decay in the Earth interior. We comment on a systematic approach to the evaluation of the geo-neutrino contribution and of its uncertainties in KamLAND, taking into account geophysical and geochemical indications, estimates, and data. The re...

2004
Sittichai Natesakhawat Xueqin Wang Umit S. Ozkan

Hydrogen generation technologies have become increasingly important due to recent attention focusing on fuel cells. The water-gas shift reaction, which is performed in two stages as highand low-temperature shift, is of central significance to produce highpurity hydrogen. Generally, the high-temperature water-gas shift reaction (HTS) is conducted on Fe-Cr catalysts. However, these catalytic syst...

Journal: :Dalton transactions 2015
Bo Fang Guohua Hou Guofu Zi De-Cai Fang Marc D Walter

The synthesis, structure, and reactivity of a thorium metallacyclopentadiene were comprehensively studied. The reduction of (η(5)-C5Me5)2ThCl2 () with potassium graphite (KC8) in the presence of diphenylacetylene (PhC[triple bond, length as m-dash]CPh) yields the first thorium metallacyclopentadiene complex (η(5)-C5Me5)2Th(η(2)-C4Ph4) (). Density functional theory (DFT) studies suggest that the...

2014
Amit Kumar

Due to limited sources of natural uranium, Department of Atomic Energy (DAE) has sought thorium (Th) as an alternative source of nuclear fuel. India has one of the largest deposits of natural Th in the form of monazite in Kerala. The currently known Indian Th reserves amount to 155,000 GWe-yr of electrical energy and can meet the energy requirements during the next century and beyond. Thorium-2...

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