JP2016034639A - 陽イオン吸着剤の製造方法 - Google Patents
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Abstract
Description
吸着率(%)=(ACA−BCA)/ACA×100
陽イオン吸着剤によるCsイオンの吸着率は95%以上であることがより好ましく、99%以上であることがさらに好ましい。Csイオンの吸着率(回収率)が高いほど、原子力施設からの廃水の無害化に対してより高い効果を発揮する。
誘導結合型プラズマ処理により酸化タングステン微粒子を製造した。得られた酸化タングステン微粒子のBET比表面積は41.1m2/gであった。このBET比表面積から換算した粒径は、約20nmであった。
誘導結合型プラズマ処理により酸化タングステン微粒子を製造した。得られた酸化タングステン微粒子のBET比表面積は91.3m2/gであった。このBET比表面積から換算した粒径は約9nmであった。
誘導結合型プラズマ処理により酸化タングステン微粒子を製造した。得られた酸化タングステン微粒子のBET比表面積は91.3m2/gであった。この酸化タングステン微粒子1gを水10mlに分散させて水系分散液とした。この陽イオン吸着剤を含む水系分散液を、Srイオンを含有する溶液10mlに添加し、さらにスターラーで4時間撹拌し、その後静置した。静置後の溶液には沈殿物が生成していた。静置後の溶液から上澄み液を分取し、ICP質量分析法によりSrイオンの含有量を測定した。その結果、Srイオンの含有量0.005ppmであり、酸化タングステン微粒子(吸着剤)によるSrイオンの吸着率は99.9%以上であることが確認された。
実施例9で処理した被処理溶液から上澄み液を除去し、生成した沈殿物を分離した。分離した沈殿物に両性系エマルジョン型凝集剤を添加した。沈殿物の容積は添加前の1/2程度まで小さくなり、沈殿物の取扱い性が大きく向上することが確認された。
誘導結合型プラズマ処理により酸化タングステン微粒子を製造した。得られた酸化タングステン微粒子のBET比表面積は41.1m2/gであった。このBET比表面積から換算した粒径は、約20nmであった。
Claims (10)
- 酸化タングステン微粒子を有する陽イオン吸着剤の製造方法であって、
金属タングステン粉末、タングステン化合物粉末、またはタングステン化合物溶液を含む原料を酸素雰囲気中で昇華させながら酸化させてBET比表面積が11m2/g以上300m2/g以下の範囲である前記酸化タングステン微粒子を形成する工程を具備する、陽イオン吸着剤の製造方法。 - 請求項1記載の陽イオン吸着剤の製造方法において、
前記酸化タングステン微粒子のBET比表面積から換算した粒径が2.7nm以上75nm以下の範囲である、陽イオン吸着剤の製造方法。 - 請求項1または請求項2記載の陽イオン吸着剤の製造方法において、
前記酸化タングステン微粒子は、WO3、W20O58、W18O49、およびWO2から選ばれる少なくとも1つの化合物形態を有する、陽イオン吸着剤の製造方法。 - 請求項1または請求項2記載の陽イオン吸着剤の製造方法において、
前記酸化タングステン微粒子は、その化合物形態としてWO3を有する、陽イオン吸着剤の製造方法。 - 請求項1ないし請求項4のいずれか1項記載の陽イオン吸着剤の製造方法において、
前記陽イオン吸着剤が吸着する陽イオンは、セシウム(Cs)イオン、ストロンチウム(Sr)イオン、ヨウ素(I)イオン、およびリチウム(Li)イオンから選ばれる少なくとも1つのイオンである、陽イオン吸着剤の製造方法。 - 請求項1ないし請求項4のいずれか1項記載の陽イオン吸着剤の製造方法において、
前記陽イオン吸着剤が吸着する陽イオンがセシウム(Cs)イオンであり、ナトリウム(Na)イオンが共存する環境下で、前記ナトリウム(Na)イオンの吸着率より前記セシウム(Cs)イオンの吸着率が高い、陽イオン吸着剤の製造方法。 - 請求項1ないし請求項4のいずれか1項記載の陽イオン吸着剤の製造方法において、
前記陽イオン吸着剤が吸着する陽イオンがストロンチウム(Sr)イオンであり、ナトリウム(Na)イオンが共存する環境下で、前記ナトリウム(Na)イオンの吸着率より前記ストロンチウム(Sr)イオンの吸着率が高い、陽イオン吸着剤の製造方法。 - 請求項1ないし請求項4のいずれか1項記載の陽イオン吸着剤の製造方法において、
前記陽イオン吸着剤が吸着する陽イオンがセシウム(Cs)イオンおよびストロンチウム(Sr)イオンから選ばれる少なくとも1つのイオンであり、マグネシウム(Mg)イオン、カルシウム(Ca)イオン、およびカリウム(K)イオンから選ばれる少なくとも1つのイオンが共存する環境下で、前記マグネシウム(Mg)イオン、カルシウム(Ca)イオン、およびカリウム(K)イオンから選ばれる少なくとも1つのイオンの吸着率より前記セシウム(Cs)イオンおよびストロンチウム(Sr)イオンから選ばれる少なくとも1つのイオンの吸着率が高い、陽イオン吸着剤の製造方法。 - 請求項1ないし請求項8のいずれか1項記載の陽イオン吸着剤の製造方法において、
前記酸化タングステン微粒子を水系分散媒中に分散する工程をさらに具備する、陽イオン吸着剤の製造方法。 - 請求項1ないし請求項9のいずれか1項記載の陽イオン吸着剤の製造方法において、
前記原料を酸素雰囲気中で昇華させる方法は、誘導結合型プラズマ処理、アーク放電処理、レーザ処理、電子線処理、およびガスバーナー処理から選ばれる少なくとも一つの処理である、陽イオン吸着剤の製造方法。
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JP5847182B2 (ja) | 2016-01-20 |
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