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Controlled synthesis of Sn-based oxides via a hydrothermal method and their visible light photocatalytic performances

机译：水热法 的受控合成锡基氧化物及其可见光催化性能

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Controlled synthesis of Sn-based oxides with a different valence state is still a challenge. Here, we developed a facile hydrothermal method for selective preparation of SnO2, Sn2+ doped SnO2 (Sn2+–SnO2), and SnO/SnO2 composites, and SnO with SnCl2 as a precursor. The valence state of Sn was regulated successively from Sn4+ to Sn2+ through controlling the hydrothermal solution from an O2-rich to an O2-deficient atmosphere, which was achieved by adding H2O2 or urea into the solution. The structure, absorption, morphology, and the visible light photocatalytic performance of the products were investigated systematically. SnO2, Sn2+–SnO2, SnO/SnO2, and SnO could be prepared in a H2O2-contained, H2O, urea-contained, and N2 purged urea-contained solution, respectively. For Sn2+–SnO2, the doping amount of Sn2+ could be further tuned by varying the hydrothermal temperature, while for SnO/SnO2, the coupling amount of SnO could be controlled by the dosage of urea. Visible-light-induced photocatalytic degradation of methyl orange was achieved successfully on Sn2+–SnO2 and SnO/SnO2. However, further work is still required to improve the stability of the samples due to vulnerability of Sn2+.
机译：价态不同的Sn基氧化物的受控合成仍然是一个挑战。在这里，我们开发了一种简便的水热方法，用于选择性制备SnO 2 ，Sn 2 + 掺杂SnO 2 （Sn 2 + –SnO 2 ），和SnO / SnO 2 复合材料，以及以SnCl 2 为前体的SnO。通过控制水热溶液，将Sn的价态从Sn 4 + 依次调节为Sn 2 + 通过添加H 将富含O 2 的空气添加到缺乏O 2 的气氛中将 2 O 2 或尿素倒入溶液中。系统地研究了产物的结构，吸收，形貌和可见光的光催化性能。 SnO 2 ，Sn 2 + –SnO 2 ，SnO / SnO 2 和SnO可以在H 2 O 2 包含，H 2 O，尿素包含和N 2 吹扫的含尿素溶液。对于Sn 2 + –SnO 2 ，Sn 2+ < / sup> 可以通过改变水热温度来进一步调节，而对于SnO / SnO 2 ，SnO的耦合量可以通过改变水热温度来控制。尿素。在Sn 2 + –SnO 2 和SnO上成功实现了可见光诱导的甲基橙光催化降解/ SnO 2 。但是，由于Sn 2 + 的脆弱性，仍需要进一步的工作来提高样品的稳定性。

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