The Utilization of Modified Zeolite for the Removal of Cs Ions in an Aqueous Solution: Adsorption Capacity, Isotherms, Kinetics and Microscopic Studies

Junfang Sun, Ji Chen, Xiang Peng, Yu Zhang, Jialin Mo, Xin Liao and Qiang Tang
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Junfang Sun: Dongwu Business School, Soochow University, Suzhou 215021, China
Ji Chen: Graduate School of Global Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
Xiang Peng: Dongwu Business School, Soochow University, Suzhou 215021, China
Yu Zhang: Graduate School of Global Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
Jialin Mo: Graduate School of Global Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
Xin Liao: Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
Qiang Tang: Graduate School of Global Environmental Studies, Kyoto University, Kyoto 606-8501, Japan

Sustainability, 2022, vol. 14, issue 5, 1-15

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.

Keywords: cesium; modified zeolite; adsorption; isotherms and kinetics; micro-scope characterization (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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