期刊
CHEMOSPHERE
卷 259, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.127494
关键词
Adsorption; Cesium; Concrete; Building material; Paving roads
资金
- R&D Center for Green Patrol Technologies through the R&D for Global Top Environmental Technologies (NTIS) [1485016089]
- Knowledge-based environmental service(Waste to energy) Human resource development Project - Ministry of Environment, Republic of Korea (MOE) [YL-WE-18-002]
The concrete building and paved roads in the urban areas can be exposed to cesium (Cs+) in case of the accidental release to environment. The adsorption kinetics of Cs+ onto concrete powder was well-represented by the pseudo-second-order kinetic model and intra-particle diffusion model. Both Langmuir and Freundlich isotherm models adequately described the adsorption of Cs+ onto the concrete powder. Lower temperature favored the adsorption of Cs+, and the activation energy was estimated as 1.57 kJ/mol, which indicates a physical adsorption process. Additionally, the adsorption of Cs+ onto the concrete powder was spontaneous (Delta G < 0), exothermic (Delta H < 0), and its adsorption formed a stable arrangement onto the concrete powder (Delta S < 0). The adsorption of Cs+ onto the concrete block was similar to that onto the powder, where the activation energy was 25.64 kJ/mol indicating physical adsorption. The presence of Na+ enhanced the adsorption of Cs+ because Na+ lowered the competitive inhibition of K+ on the adsorption of Cs+ based on hydrated radius and hydration enthalpy. The amounts of Cs+ adsorbed onto C-S-H gel were not substantial and the adsorption was slow, but it should be considered in an urban area due to a huge coverage of concrete. (C) 2020 Elsevier Ltd. All rights reserved.
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