Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 69(7): 217-231 (2020)


セシウム吸着に用いるプルシアンブルー類似体の特性評価と水溶液中からのセシウム除去法の検討Characteristic of Prussian Blue Analogue Used in Caesium Adsorption and Study of Caesium Removal from Aqueous Solution

1新潟大学大学院自然科学研究科Graduate School of Science and Technology, Niigata University

2新潟大学工学部工学科化学システム工学プログラムDepartment of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University

受付日:2019年9月24日Received: September 24, 2019
受理日:2020年2月3日Accepted: February 3, 2020
発行日:2020年7月15日Published: July 15, 2020

プルシアンブルー(PB)とフェロシアン化銅(CF)を合成し,XRD, SEM, XPS, N2-BETを用いて特性評価を行った。これらの粉末によるCs吸着性能の基礎的特性を探究したところ,LangmuirとFreundlich双方の吸着等温式に適合し,Langmuir吸着等温式による最大吸着量はPBが296 mg/g, CFが409 mg/gであった。さらに新規吸着剤としてCFを担持したSiO2(CF-SiO2)のCs吸着における有用性を検証するため,PB, CF粉末試料と同様に阻害カチオン(Na+, K+, Mg2+)によるCs+吸着への影響も検証した。本研究で作成した吸着剤は,放射性セシウム(137Cs)除去に対して有用であると示唆された。

Prussian blue (PB) and copper ferrocyanide (CF) were synthesized and characterized by XRD, SEM, XPS and N2-BET. The basic adsorption behavior of caesium (Cs) onto these adsorbents were investigated. The adsorption isotherms was fitted by both Langmuir and Freundlich isotherm equations (particularly fitted to Langmuir equation for CF). The maximum adsorption capacity based on Langmuir equation was determined to be 296 mg/g for PB and 409 mg/g for CF. Moreover, to evaluate the efficiency of SiO2 carried CF (CF-SiO2) as novel adsorbent for Cs, the effect of interfering cations on the adsorption capacity of Cs+ was investigated in the presence of several competitive cations (i.e., Na+, K+, Mg2+) as well as PB and CF. In the present study, this adsorbent was tentatively applied to the removal of radioactive caesium (137Cs). The adsorbent synthesized in this work can be an efficient adsorbent for Cs+.

Key words: adsorption selectivity for caesium; prussian blue; copper ferrocyanide; copper ferrocyanide carried with silica gel

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