| Photocatalytic Reduction of Cr^Ⅵ by Natural Sphalerite Suspensions under Visible Light Irradiation |
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| 作者姓名： | LI Yan LU Anhuai WANG Changqiu |
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| 作者单位： | School of Earth and Space Sciences, Peking University, Beijing 100871 |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China （Grant No. 40572022）. |
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| 摘 要： | The photocatalytic reductive capability of a natural semiconducting mineral, sphalerite has been studied for the first time. The sphalerite from the Huangshaping deposit of Hunan Province performed great photoreductive capability that 91.95% of the Cr^6＋ was reduced under 9 h visible light irradiation, higher than the 70.58% under 9.5 h UV light irradiation. The highly reductive ability results from its super negative potential of electrons in the conduction band. Furthermore, Fe substitution for Zn introduces donor states, and the oxidation process of Fe^2＋ to Fe^3＋ makes it an effective hole-scavenger. Cd and Cu substitute for Zn also reduce the bandgap and help broaden the absorbing edge towards the visible light. These substituting metal ions in natural sphalerite make it a hyper-active photocatalyst and very attractive for solar energy utilization.
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| 关 键 词： | 闪锌矿 光致还原 可视光 能带隙 悬浮液 |
| 收稿时间： | 2006-01-11 |
| 修稿时间： | 2006-02-17 |
Photocatalytic Reduction of CrVI by Natural Sphalerite Suspensions under Visible Light Irradiation |
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| Authors: | LI;Yan;LU;Anhuai;WANG;Changqiu |
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| Abstract: | Abstract The photocatalytic reductive capability of a natural semiconducting mineral, sphalerite has been studied for the first time. The sphalerite from the Huangshaping deposit of Hunan Province performed great photoreductive capability that 91.95% of the Cr6+ was reduced under 9 h visible light irradiation, higher than the 70.58% under 9.5 h UV light irradiation. The highly reductive ability results from its super negative potential of electrons in the conduction band. Furthermore, Fe substitution for Zn introduces donor states, and the oxidation process of Fe2+ to Fe3+ makes it an effective hole‐scavenger. Cd and Cu substitute for Zn also reduce the bandgap and help broaden the absorbing edge towards the visible light. These substituting metal ions in natural sphalerite make it a hyper‐active photocatalyst and very attractive for solar energy utilization. |
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| Keywords: | natural sphalerite photoreduction Cr6+ visible light substituting ions bandgap |
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