Facile ion-exchange synthesis of mesoporous Bi2S3/ZnS nanoplate with high adsorption capability and photocatalytic activity.
Facile ion-exchange synthesis of mesoporous Bi2S3/ZnS nanoplate with high adsorption capability and photocatalytic activity.
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DOI：
10.1016/j.jcis.2015.11.015
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发表时间：
2016-02
影响因子：
9.9
通讯作者：
Dan Xiong;Gui‐Fang Huang;Bing-Xin Zhou;Q. Yan;Anbo Pan;Wei‐Qing Huang
中科院分区：
文献类型：
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作者：
Dan Xiong;Gui‐Fang Huang;Bing-Xin Zhou;Q. Yan;Anbo Pan;Wei‐Qing Huang
通过简单的回流和阳离子交换反应，成功地制备出了新型的Bi2S3/ZnS纳米板材。所合成的Bi2S3/硫化锌纳米板材为介孔结构，具有较高的比表面积101.30µm2/g，在紫外光照射下对亚甲基蓝(MB)具有较高的吸附能力和光催化活性。这种高的吸附能力和光催化活性可以归因于具有大比表面积的Bi2S3/ZnS纳米片的形成提供了更多的活性中心，有利于光生电子-空穴对的分离。根据随时间变化的观察结果，提出了Bi2S3/ZnS纳米板形成的可能机制。此外，以甲醇或草酸铵为清除剂，提出了以自由基和光生空穴为活性物种的Bi2S3/ZnS对MB的降解机理。这项工作为大规模合成具有可控结构形态的复合材料提供了一种经济有效的方法，并在光催化方面具有很好的应用前景。
Novel Bi2S3/ZnS nanoplates have been successfully prepared by simple reflux and cation exchange reaction between the preformed ZnS spheres and Bi(NO3)3·5H2O. The synthesized Bi2S3/ZnS nanoplates are mesoporous structures, possess a high specific surface area of 101.30 m2/g and exhibit high adsorption capability and photocatalytic activity for methylene blue (MB) degradation under UV light irradiation. The high adsorption capability and photocatalytic activity can be ascribed to the fact that the formation of Bi2S3/ZnS nanoplates with large specific surface area provides more reactive sites and facilitates the separation of photogenerated electron–hole pairs. The possible formation mechanism of Bi2S3/ZnS nanoplates is proposed based on the time-dependent observation. Moreover, a tentative mechanism for degradation of MB over Bi2S3/ZnS has been proposed involvingradical dotOH radical and photoinduced holes as the active species, which is confirmed by using methanol or ammonium oxalate as scavengers. This work provides a cost-effective method for large-scale synthesis of composite with controlled architectural morphology and highly promising applications in photocatalysis.