不同晶体形貌NH2-MIL-125(Ti)制备及光催化性能

Preparation and Photocatalytic Activity of NH2-MIL-125(Ti) with Different Crystal Morphologies

摘要:

采用溶剂热法合成了NH2-MIL-125(Ti)晶体，通过调变N,N-二甲基甲酰胺（DMF）和无水甲醇（MeOH）两种溶剂比例，NH2-MIL-125(Ti)晶体呈现出圆形片、十面体和八面体形貌。采用XRD、SEM、FT-IR和BET等表征手段对不同形貌的NH2-MIL-125(Ti)晶体进行物性分析，并将其用于可见光光催化环己烷氧化反应，探究了催化性能与晶面之间的构效关系。分析得出， 环己烷选择性氧化生成环己醇和环己酮目标产物主要反应发生在NH2-MIL-125(Ti)晶体的{110}晶面族，而{101}晶面族主要是进一步氧化环己醇和环己酮产生COx。

Abstract:

NH2-MIL-125(Ti) crystals were prepared by a solvothermal method. By varing the ratios of N,N-dimethylformamide (DMF) and methanol (MeOH) in the synthesis system, NH2-MIL-125(Ti) crystals exhibited circular plate, decahedral or octahedral morphology. XRD, SEM, FT-IR and BET characterization techniques were used to study the physical properties of NH2-MIL-125(Ti) crystals with different morphologies. Then these crystals were used in the photocatalytic oxidation of cyclohexane under visible light irradiation. The structure-activity relationship between catalytic performance and crystal plane was explored. Results showed that the main reaction of selective oxidation of cyclohexane to target products cyclohexanol and cyclohexanone occurs in the {110} crystal face family of NH2-MIL-125(Ti) crystal, whereas the {101} crystal face family is mainly to further oxidize cyclohexanol and cyclohexanone into COx.