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首页> 外文期刊>Separation and Purification Technology >Photocatalytic properties of SnS2/SnO2 nanocomposite prepared by thermal oxidation of SnS2 nanoparticles in air
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Photocatalytic properties of SnS2/SnO2 nanocomposite prepared by thermal oxidation of SnS2 nanoparticles in air

机译：SnS2纳米粒子在空气中热氧化制备的SnS2 / SnO2纳米复合材料的光催化性能

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摘要

An alternative in situ chemical method, which was based on thermal oxidation of SnS2 nanoparticles in air at 300 °C for 3 h, was proposed for the preparation of SnS2/SnO2 nanocomposite (SnS2/SnO2-TO). The photocatalytic properties of SnS2/SnO2-TO were tested by the reduction of aqueous Cr(VI) under visible-light (λ >420 ran) irradiation, and compared with those of SnS2 nanoparticles, SnO2 nanoparticles and SnS2/SnO2-PM (which denotes the physically mixed SnS2/SnO2 nanocomposite with the same composition as SnS2/SnO2-TO). Besides, the effects of the coexistence of some organic compounds (e.g., phenol, rhodamine B (RhB) and methyl orange (MO)) on SnS2/SnO2-TO-mediated photocatalytic reduction of aqueous Cr(VI) were also studied. It was observed that (i) SnS2/SnO2-TO not only displayed higher visible-light-activated photocatalytic activity than SnS2, SnO2 and SnS2/SnO2-PM, but also displayed good reusability in the reduction of aqueous Cr(VI); and (ii) the coexistence of phenol and RhB enhanced the photocatalytic reduction of Cr(VI), whereas the coexistence of MO retarded the photocatalytic reduction of Cr(VI) over SnS2/SnO2-TO. The reasons accounting for the photocatalytic results were also discussed.
机译：提出了一种替代性的原位化学方法，该方法基于SnS2纳米粒子在空气中在300°C下热氧化3小时的方法，用于制备SnS2 / SnO2纳米复合材料（SnS2 / SnO2-TO）。通过在可见光（λ> 420 ran）下还原水溶液中的Cr（VI）来测试SnS2 / SnO2-TO的光催化性能，并与SnS2纳米颗粒，SnO2纳米颗粒和SnS2 / SnO2-PM（其中表示物理混合的SnS2 / SnO2纳米复合材料，其组成与SnS2 / SnO2-TO相同。此外，还研究了某些有机化合物（例如苯酚，若丹明B（RhB）和甲基橙（MO））共存对SnS2 / SnO2-TO介导的Cr（VI）水溶液光催化还原的影响。观察到：（i）SnS2 / SnO2-TO不仅显示出比SnS2，SnO2和SnS2 / SnO2-PM更高的可见光活化光催化活性，而且在还原Cr（VI）方面显示出良好的可重复使用性; （ii）苯酚和RhB的共存增强了Cr（VI）的光催化还原，而MO的共存阻碍了Cr（VI）的SnS2 / SnO2-TO的光催化还原。还讨论了造成光催化结果的原因。

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