Removal of MC-LR using the stable and efficient MIL-100/MIL-53 (Fe) photocatalyst: The effect of coordinate immobilized layers
Removal of MC-LR using the stable and efficient MIL-100/MIL-53 (Fe) photocatalyst: The effect of coordinate immobilized layers
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使用稳定高效的 MIL-100/MIL-53 (Fe) 光催化剂去除 MC-LR：配位固定层的效果
DOI：
10.1016/j.apcatb.2019.04.086
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Huang Yingping
中科院分区：
文献类型：
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作者：
Tian Hailin;Araya Tirusew;Li Ruiping;Fang Yanfen;Huang Yingping
微囊藻毒素-LR（Microcystin-LR，MC-LR）是由蓝藻产生的一种常见的微囊藻毒素，对水生生物和人类具有严重的威胁。因此，迫切需要一种有效的去除MC-LR的方法。本工作利用静电相互作用成功制备了MIL-100/MIL-53（Fe）光催化剂，并将其应用于MC-LR的光催化降解。采用SEM、XRD、XPS、FT-IR和UV-vis DRS等手段对MIL-100/MIL-53（Fe）光催化剂的结构和光学性能进行了表征，结果表明，MIL-100/MIL-53（Fe）光催化剂在很低的投加量下即可实现对MC-LR的降解，最佳投加量为50%。与MIL-100（Fe）和MIL-53（Fe）相比，50%MIL-100/MIL-53（Fe）光催化剂在可见光照射下3 h后对MC-LR的降解率高达96.5%。MIL-100（Fe）和MIL-53（Fe）之间的配位固定层的作用有助于50%MIL-100/MIL-53（Fe）光催化剂稳定有效地去除MC-LR。通过自由基捕获实验和LC-MS分析，提出了以光生空穴（h+）为主要活性物种的MC-LR光催化降解机理和降解途径。
Microcystin-LR (MC-LR), which is produced from cyanobacteria, is the common microcystin with a serious threat to aquatic life and human beings. And the efficient removal method of MC-LR is urgent needed. In this work, the MIL-100/MIL-53 (Fe) photocatalysts, which were successfully prepared by the electrostatic interaction with each other, were applied for the photocatalytic degradation of MC-LR. The structure and optical properties of the MIL-100/MIL-53 (Fe) photocatalysts were characterized by using SEM, XRD, XPS, FT-IR and UV–vis DRS. The very low dosage of the MIL-100/MIL-53 (Fe) photocatalysts achieved the degradation of MC-LR, and the optimized loading was the 50% MIL-100/MIL-53 (Fe) photocatalyst. Compared to MIL-100 (Fe) and MIL-53 (Fe), the MC-LR degradation was up to 96.5% after 3 h under visible light illumination with the 50% MIL-100/MIL-53 (Fe) photocatalyst due to the pore-effect adsorption and the effective separation of photogenerated carriers. The effect of coordinate immobilized layers between MIL-100 (Fe) and MIL-53 (Fe) contributed to the stable and efficient removal of MC-LR for the 50% MIL-100/MIL-53 (Fe) photocatalyst. The MC-LR photocatalytic mechanism and degradation pathway, which the photogenerated holes (h+) were the main active species, were proposed by radical capture experiments and LC-MS analysis.