| Zn/Cr型阴离子黏土的制备、表征及其对活性艳橙X-GN的去除性能研究 |
| 摘要点击 1565 全文点击 1365 投稿时间：2011-09-07 修订日期：2011-12-23 |
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| 中文关键词 阴离子黏土 煅烧阴离子黏土 表征 活性艳橙X-GN 吸附 光催化 |
| 英文关键词 layered double hydroxides layered mixed oxides characterization reactive brilliant orange X-GN adsorption photocatalysis |
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| 中文摘要 |
| 采用共沉淀法制备了Zn/Cr摩尔比为1∶1~5∶1的Zn/Cr型阴离子黏土(Zn/Cr-LDHs),选取2∶1 Zn/Cr-LDHs分别在300、 400、 500℃条件下放入马弗炉中煅烧2 h,制备了煅烧阴离子黏土(Zn/Cr-LDO).采用X射线衍射光谱(XRD)、傅里叶红外光谱(FTIR)、原子吸收法(ASS)、比表面积测试法(BET)对上述制备的材料结构形态进行表征.研究2∶1 Zn/Cr-LDHs和 Zn/Cr-LDO在紫外和避光条件下对活性艳橙X-GN的去除.实验表明,2∶1 Zn/Cr-LDHs 的吸附效果不受紫外光照射的影响,煅烧后形成的Zn/Cr-LDO在紫外光的照射下,对活性艳橙X-GN的去除率是避光条件下的 2倍,说明煅烧后的Zn/Cr阴离子黏土具有光催化性能, Zn/Cr-LDO对活性艳橙X-GN的去除是吸附和光催化的共同作用. |
| 英文摘要 |
| Zn/Cr-LDHs with cationic ratios of 1∶1 to 1∶5 were prepared using the co-precipitation method. After preparation of the layered double hydroxides, 2∶1 Zn/Cr-LDHs were calcined at 300, 400 and 500℃ in a Muffle furnace for 2 h. The obtained mixed oxides are also called calcined layered double hydroxides (Zn/Cr-LDO). Structures of the obtained materials were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, atomic absorption spectrometry and BET analysis. Experiments were then carried out to investigate the removal of reactive brilliant orange X-GN by 2∶1 Zn/Cr-LDHs and Zn/Cr-LDO under ultraviolet light and in dark conditions. The results showed that the removal capacity of 2∶1 Zn/Cr-LDHs was not affected by ultraviolet light. Under the irradiation of ultraviolet light, the removal rate of reactive brilliant orange X-GN by Zn/Cr-LDO was twice as high as that in dark conditions, which demonstrated its photocatalysis property and its removal of reactive brilliant orange X-GN by the combined action of absorption and photocatalysis. |
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