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首页> 外文期刊>Journal of materials science >CdSe QDs sensitized MIL-125/TiO_2@SiO_2 biogenic hierarchical composites with enhanced photocatalytic properties via two-level heterostructure
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CdSe QDs sensitized MIL-125/TiO_2@SiO_2 biogenic hierarchical composites with enhanced photocatalytic properties via two-level heterostructure

机译：CdSe QDs通过两级异质结构敏化具有增强的光催化性能的MIL-125 / TiO_2 @ SiO_2生物型分层复合材料

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摘要

With increasing concern about the problems of environmental pollution and energy, the visible light photocatalytic for dye degradation is receiving considerable attention. CdSe quantum dot (CdSe QDs) sensitized MIL-125/TiO~(2)@SiO~(2)biogenic hierarchical materials (CMTS) has been fabricated through dual modification of CdSe with TiO~(2)and MIL-125, that is the metal–organic framework (MOF) with Ti ions as metal centers and terephthalic acid as the organic ligand. The hierarchical porous heterostructured MIL-125/TiO~(2)@SiO~(2)composites are firstly obtained by a biogenic-templated method using rice husk as biomorphic. CdSe QDs as sensitizer is further deposited on MIL-125/TiO~(2)@SiO~(2)via a dipping method. This strategy applies CdSe, MIL-125, and TiO~(2)undergo a two-level heterostructure, setting a stage for efficient charge separation. In addition, CMTS possesses a hierarchical porous structure in scale from micrometer to nanometer with high BET surface area. As a result, the CMTS can efficiently adsorption target, improving light harvesting and promoting degradation of organic waste from water. Meanwhile, Rhodamine B aqueous solution can be degraded more than 98% by CMTS in 100 min under visible light irradiation.
机译：随着对环境污染和能源问题的日益关注，光催化降解染料的可见光受到了广泛关注。通过用TiO〜（2）和MIL-125对CdSe进行二次修饰，制备了CdSe量子点（CdSe QDs）敏化的MIL-125 / TiO〜（2）@ SiO〜（2）生物分层材料（CMTS）。以Ti离子为金属中心，对苯二甲酸为有机配体的金属有机框架（MOF）。首先以稻壳为生物形态，通过生物模板法获得了MIL-125 / TiO〜（2）@ SiO〜（2）分层多孔复合材料。通过浸渍法将CdSe量子点作为敏化剂进一步沉积在MIL-125 / TiO〜（2）@ SiO〜（2）上。该策略将CdSe，MIL-125和TiO〜（2）应用于两级异质结构，为高效电荷分离奠定了基础。另外，CMTS具有从微米到纳米的规模的，具有高BET表面积的分级多孔结构。结果，CMTS可以有效地吸附目标，改善光收集并促进水中有机废物的降解。同时，若丹明B水溶液在可见光照射下100分钟内可被CMTS降解98％以上。

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