| Cr(VI)离子在TiO2表面的吸附与光催化还原消除 |
| 摘要点击 807 全文点击 1898 投稿时间：1997-09-01 |
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| 中文关键词 重金属Cr(VI)离子 暗态吸附 光催化还原 消除污染 TiO2半导体催化剂 |
| 英文关键词 Cr(VI) ion adsorption photocatalytic reduction detoxification TiO2 photocatalyst |
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| 中文摘要 |
| 随着体系pH值增大,Cr(VI)离子在TiO2表面的吸附下降。当Cr(VI)离子初始浓度为300μmol/L时,其在TiO2表面具有最大值吸附。H2PO4-阴离子及乙酸的存在对Cr(VI)离子的吸附有阻抑作用,甲酸存在会提高Cr(VI)离子的吸附。Cr(VI)离子在TiO2半导体催化剂表面的光催化还原受体系的酸度影响较大。H2PO4-阴离子或Mn2+离子存在会降低Cr(VI)离子的光催化还原效率。在太阳光照下,Cr(VI)离子在TiO2上的光催化还原也可实现。通过调节反应结束后水溶液的酸碱度,Cr(VI)离子得以消除。反应后催化剂经酸处理,其活性恢复并可重复使用。 |
| 英文摘要 |
| Adsorption of Cr(VI) on TiO2 decreased with the increase of the suspension pH.The largest Cr(VI)adsorption appeared when its initial concentration was about 300 μmol/L.The existence of H2PO4- anion and acetic acid decreased the adsorption efficiency of Cr(VI),and formic acid promoted its adsorption efficiency. Other organic molecules had noninterference with Cr(VI)adsorption,and competitive adsorption did not happen between them.System pH had remarkable effects on photocatalytic reduction of Cr(VI)on TiO2.H2PO4- anion and Mn2+ cation both had inhibition on Cr(VI)reduction. Different organic compounds had different influences on Cr(VI)reduction because of their different electrical properties.Under the sunlight irradiation,Cr(VI)reduction was also observed on TiO2 photocatalyst.After separation of the catalyst,chromium was removed and detoxified from the waste water by adjusting the pH of the system.TiO2 photocatalyst was reactivated and reused after it was washed in acidic medium. |
