MoS_(2)@TiO_(2)/CNFs复合材料活化PMS快速去除有机污染物的研究

MoS_(2)@TiO_(2)/CNFs composite activated PMS for rapid removal of organic pollutants

MoS_(2)能否高效激发过硫酸盐(PMS)产生高氧化性的过硫酸根基,很大程度上取决于MoS_(2)纳米片上活性边缘的数量。将MoS_(2)纳米片垂直生长在TiO_(2)基底上,能够充分暴露MoS_(2)的活性位点。通过静电纺丝、碳化和水热法成功地在TiO_(2)碳纤维上近垂直生长MoS_(2)纳米片,得到MoS_(2)@TiO_(2)/CNFs复合材料。在光照条件下,MoS_(2)@TiO_(2)/CNFs复合材料活化PMS后,对亚甲基蓝(MB)的降解率达到97.1%,比仅使用MoS_(2)@TiO_(2)/CNFs的催化体系降解速率提升4倍。连续循环5次后,降解率仍能保持在84.8%。以上结果说明MoS_(2)@TiO_(2)/CNFs复合材料具有优异的光催化性能和较高的稳定性。

Whether molybdenum disulfide(MoS_(2)) can efficiently stimulate persulfate(PMS) to produce highly oxidizing persulfate base ·SO-4depends greatly on the number of active edges on MoS_(2)nanosheets.The active site of MoS_(2)can be fully exposed by vertically growing MoS_(2)nanosheets on titanium dioxide(TiO_(2)) substrate.In this paper, MoS_(2)@TiO_(2)/CNFs composites were prepared by successfully growing MoS_(2)near-vertical on TiO_(2)carbon fiber by electrostatic spinning, carbonization and hydrothermal methods.Under light radiation, the degradation rate of methylene blue(MB) reached 97.1% by MoS_(2)@TiO_(2)/CNFs composite activated PMS,which was 4 times higher than that of catalytic system without PMS.After 5 consecutive cycles, the degradation rate still remained at 84.8%.The results showed that MoS_(2)@TiO_(2)/CNFs composite had excellent photocatalytic performance and high stability.