JP2009233634A - 光触媒の再生方法 - Google Patents
光触媒の再生方法 Download PDFInfo
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- Treatment Of Water By Oxidation Or Reduction (AREA)
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Abstract
【解決手段】 有機性不純物を含有する水の浄化処理に用いられ、前記水浄化処理中の汚染により劣化した光触媒の再生方法であり、前記光触媒を酸性水溶液で洗浄した後、アルカリ性水溶液で洗浄することを特徴とする。好ましい光触媒としては、シリカ成分を主体とする酸化物相(第1相)とチタンを含む金属酸化物相(第2相)との複合酸化物相からなる繊維であって、第2相を構成する金属酸化物のチタンの存在割合が繊維の表層に向かって傾斜的に増大しており、光触媒機能を有するシリカ基複合酸化物繊維である。
【選択図】 図1
Description
5リットルの三口フラスコに無水トルエン2.5リットルと金属ナトリウム400gとを入れ窒素ガス気流かでトルエンの沸点まで加熱し、ジメチルジクロロシラン1リットルを1時間かけて滴下した。滴下終了後、10時間加熱還流し沈殿物を生成させた。この沈殿をろ過し、まずメタノールで洗浄した後、水で洗浄して、白色粉末のポリジメチルシラン420gを得た。ポリジメチルシラン250gを、水冷還流器を備えた三口フラスコ中に仕込み、窒素気流下、420度で30時間加熱反応させて数平均分子量が1200のポリカルボシランを得た。
図1に示すように、内容積1Lのガラス製容器1に上部バルブ2、下部バルブ3を取り付けたものの内部に、上水、温浴水、プール水、飲料用水、海水、産業用水中の有機物の酸化分解、細菌の分解、真菌の分解、ウイルスの分解、藻類の分解の光化学反応処理に用い、金属化合物及び未分解有機物が付着した、参考例1で得られたチタニア/シリカ繊維不織布を2枚積層し、約2mmの厚みとし、これをステンレス製の金網(線径1mm、3メッシュ)を支持部材として直径約85mm、高さ130mmで中央部に直径20mmの穴を開けた中空円錐台状成型物、光触媒カートリッジ4を静置した。
実施例と同条件の光化学反応処理に用いた光触媒カートリッジ4を特許文献1に記述されているよう、ガラス製容器1に静置、水道水を1L注入後、下部バルブ3から1L/minで空気を曝気させ、攪拌しながら、超音波振動を加え1,2,3時間洗浄を行った。洗浄後、実施例と同様にしてMSAの生成量を測定し、洗浄後の光触媒活性とした。結果を表1に示す。表1から、実施例と比較し、再生度はかなり低く、殆ど洗浄効果が認められないことが明らかになった。
実施例と同条件の光化学反応処理に用いた光触媒カートリッジ4を特許文献2に記述されているよう、ガラス製容器1に静置、1Nのクエン酸1L注入後、ポンプで1L/hrの流速を与え12時間洗浄を行った。洗浄後、実施例と同様にしてMSAの生成量を測定し、洗浄後の光触媒活性とした。結果を表1に示す。表1から分かるように、長時間洗浄したのにもかかわらず、実施例と比較し、大きな再生度は得られなかった。
実施例1〜9の操作を酸性溶液洗浄のみにした場合(比較例5〜7)、アルカリ性溶液のみにした場合(比較例8〜10)、酸性溶液とアルカリ性溶液の洗浄順序を逆にした場合(比較例11〜19)を表1に示す。表1から分かるように、それぞれ単独での洗浄では、再生度が上がらず、値も収束傾向であり、時間を延ばせば100%になるということもない。また、順序を逆にした場合では、実施例と比較し、洗浄時間に対する再生度が低いということが分かった。
2 上部バルブ
3 下部バルブ
4 光触媒カートリッジ
5 ポンプ
Claims (6)
- 有機性不純物を含有する水の浄化処理に用いられ、前記水浄化処理中の汚染により劣化した、光触媒の再生方法であり、前記光触媒を酸性水溶液で洗浄した後、アルカリ性水溶液で洗浄することを特徴とする光触媒の再生方法。
- 前記光触媒が、シリカ成分を主体とする酸化物相(第1相)とチタンを含む金属酸化物相(第2相)との複合酸化物相からなる繊維であって、第2相を構成する金属酸化物のチタンの存在割合が繊維の表層に向かって傾斜的に増大しており、光触媒機能を有するシリカ基複合酸化物繊維であることを特徴とする請求項1記載の光触媒の再生方法。
- 前記の酸性水溶液が強酸性水溶液であることを特徴とする請求項1記載の光触媒の再生方法。
- 前記のアルカリ性水溶液が強アルカリ性水溶液であることを特徴とする請求項1記載の光触媒の再生方法。
- 前記洗浄は、光触媒を酸性水溶液またはアルカリ性水溶液に浸漬することにより行うことを特徴とする請求項1記載の光触媒の再生方法。
- 前記酸性水溶液またはアルカリ性水溶液に強制対流を起こして光触媒を洗浄することを特徴とする請求項5記載の光触媒の再生方法。
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