K3ScF6∶Tm3+,Yb3+/CdS光催化复合材料的制备及其光催化性能研究

摘要/Abstract

摘要： 上转换材料与光催化剂复合可以产生吸收光谱“红移”的效果,对提高光催化剂的降解效率具有重要意义。为了提高CdS对近红外光的利用率,通过高温固相反应法合成了冰晶石结构上转换发光材料K₃ScF₆∶Tm³⁺,Yb³⁺,并采用高能球磨法将其与CdS复合制备出一种新型光催化复合材料K₃ScF₆∶Tm³⁺,Yb³⁺/CdS。采用X射线粉末衍射(XRD)、场发射扫描电镜(SEM)、荧光光谱(PL)和紫外-可见漫反射吸收光谱对其成分、结构和性能进行了系统表征。同时,对不同复合比例下制备的复合催化剂对罗丹明B(RhB)的光降解效率和K₃ScF₆∶Tm³⁺,Yb³⁺/CdS光催化复合材料的光催化机理进行了研究。结果表明,K₃ScF₆∶Tm³⁺,Yb³⁺和CdS的最佳复合比为3.6∶1,上转换发光材料K₃ScF₆∶Tm³⁺,Yb³⁺的引入协同促进了CdS的光催化作用,光催化过程中·OH与·O^2-均参与了对RhB的降解,并且·OH起主要作用。此外,在最佳复合比下,经过80 min,K₃ScF₆∶Tm³⁺,Yb³⁺/CdS样品降解率达到99.9%,与未复合的CdS相比,降解率提高了近50倍。所有结果表明K₃ScF₆∶Tm³⁺,Yb³⁺/CdS光催化复合材料在光催化领域具有潜在的应用价值。

关键词: 冰晶石结构, 上转换, 高能球磨, 光催化, K₃ScF₆∶Tm³⁺,Yb³⁺, CdS

Abstract: The combination of up-conversion materials and photocatalysts can produce the effect of “redshifting” of absorption spectrum, which is of great significance for improving the degradation efficiency of photocatalysts. To improve the utilization of CdS in near-infrared light, the up-conversion luminescent material K₃ScF₆∶Tm³⁺,Yb³⁺ with cryolite structure was synthesized by high-temperature solid-phase reaction method, and a new photocatalytic composite material K₃ScF₆∶Tm³⁺,Yb³⁺/CdS was prepared by combining it with CdS by high-energy ball milling method. The composition, structure and properties were systematically characterized by X-ray powder diffractometer (XRD), field emission scanning electron microscopy (SEM), fluorescence spectroscopy (PL) and UV-Vis diffuse reflection absorption spectroscopy. Simultaneously, the photodegradation efficiency and mechanism of K₃ScF₆∶Tm³⁺, Yb³⁺/CdS to rhodamine B(RhB) were studied. The results show that the optimal mass composition ratio of K₃ScF₆∶Tm³⁺,Yb³⁺ and CdS is 3.6∶1, and the introduction of up-conversion luminescent materials K₃ScF₆∶Tm³⁺,Yb³⁺ synergistically promots the photocatalytic efficiency of CdS. The ·OH and ·O^2- participated in the degradation of RhB, and ·OH plays a major role. In addition, under the optimal recombination ratio, the degradation rate of K₃ScF₆∶Tm³⁺, Yb³⁺/CdS samples reaches 99.9%, which is nearly 50 times higher than that of uncompounded CdS after 80 min. All results show that K₃ScF₆∶Tm³⁺,Yb³⁺/CdS photocatalytic composites has potential application value in the field of photocatalysis.

Key words: cryolite structure, up-conversion, high-energy ball mill, photocatalysis, K₃ScF₆:Tm³⁺,Yb³⁺, CdS

中图分类号:

帅朋飞, 黄翡菲, 郭庆丰, 廖立兵, 梅乐夫. K₃ScF₆∶Tm³⁺,Yb³⁺/CdS光催化复合材料的制备及其光催化性能研究[J]. 人工晶体学报, 2023, 52(8): 1467-1476.

SHUAI Pengfei, HUANG Feifei, GUO Qingfeng, LIAO Libing, MEI Lefu. Preparation and Photocatalytic Properties of K₃ScF₆∶Tm³⁺, Yb³⁺/CdS Photocatalytic Composites[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2023, 52(8): 1467-1476.

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K₃ScF₆∶Tm³⁺,Yb³⁺/CdS光催化复合材料的制备及其光催化性能研究

Preparation and Photocatalytic Properties of K₃ScF₆∶Tm³⁺, Yb³⁺/CdS Photocatalytic Composites

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