Abstract
Nuclear energy is a double-edged technology, which has a significant role in the chemical industry, but may bring about radioactivity and destruction. The 2011 Fukushima nuclear power plant accident caused by a tsunami, which flooded and led to tens of millions of disaster debris and tsunami deposits, severely disrupted the electricity supply in Japan and induced USD 211 billion worth of direct economic losses. Cs+ was easily dissolved in this accident, had a high chemical activity, and thus required an appropriate adsorption method. Zeolite is an effective removal adsorbent, which is suitable to be investigated. The present study uses natural zeolite and three inorganic modified zeolites. Furthermore, the effects of various factors are investigated. Kinetic models and the isothermal adsorption mechanism are also conducted. For microscale studies for the adsorption mechanism, scanning electron microscope (SEM) and X-ray diffraction (XRD) were involved in the study. The results indicate that the optimal dosage is 1.1 g and the maximum adsorption rate is around 80%. An alkaline environment is more conducive to the occurrence of adsorption. As for the isotherm and kinetic studies, the data fits better with the Redlich–Peterson isothermal model and intragranular diffusion model. In this small-scale experiment, the highest adsorption capacity was for Mg-zeolite at 6.53 mg/g. Finally, Mg-Zeolite presents the best adsorption capacity.
Highlights
IntroductionAs for the isotherm and kinetic studies, the data fits better with the Redlich–Peterson isothermal model and intragranular diffusion model
Academic Editors: Rui Zhao, Graduate School of Global Environmental Studies, Kyoto University, Kyoto 606-8501, Japan; National Institute for Environmental Studies, Fukushima Branch, Miharu 963-7700, Japan
Introduction with regard to jurisdictional claims in Nuclear energy represents an important component in the chemical industry and plays an important role in power transmission, medical devices and many other fields in our society
Summary
As for the isotherm and kinetic studies, the data fits better with the Redlich–Peterson isothermal model and intragranular diffusion model In this small-scale experiment, the highest adsorption capacity was for Mg-zeolite at 6.53 mg/g. The 16 m high tsunami flooded an 80 km area, completely destroyed 129,391 houses, and damaged 1,008,394 [2], leaving almost 2.3 × 107 tons of disaster debris and more than 12 million m3 of tsunami deposits [3,4] Following this event, many geo-environmental issues emerged, such as the disposal of the disaster debris and deposit, the treatment of soil and groundwater contamination, settlements being left in a severe state as a result of the nuclear accident, and other issues concerning the economy or human beings [5]. These radionuclides dissolved in seawater and may cause the migration of the groundwater in Japan, and even the Pacific Ocean
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