Flaky CeO2/UIO-66-NH2 composite photocatalytic material and preparation method thereof

Abstract

The invention provides a flaky CeO2 / UIO-66-NH2 composite photocatalytic material and a preparation method thereof, and belongs to the technical field of photocatalyst preparation. The preparation method of the flaky CeO2 / UIO-66-NH2 composite photocatalytic material comprises the following steps: S1, preparing a CeO2 nanosheet precursor through a water bath synthesis method, and then calcining the CeO2 nanosheet precursor to obtain a CeO2 nanosheet; s2, ultrasonically dispersing zirconium tetrachloride and 2-amino-1,4 phthalic acid in a solvent, then adding the CeO2 nanosheet into the solvent, uniformly mixing the solution, preserving heat for 12-48 hours at the temperature of 100-180 DEG C, and then separating and drying the solution to obtain the flaky CeO2 / UIO-66-NH2 composite photocatalytic material. The flaky CeO2 and the UIO-66-NH2 are utilized to form a II-type heterojunction structure through surface-surface compounding, so that the separation efficiency of photo-induced electrons can be improved, and the photocatalytic activity of the composite material is favorably improved; meanwhile, the specific surface area of the composite material is increased, more active sites are favorably provided, and the photocatalytic performance is favorably improved.

Description

technical field [0001] The invention relates to the technical field of photocatalyst preparation, in particular to a flaky CeO 2 / UIO-66-NH 2 Composite photocatalytic material and preparation method thereof. Background technique [0002] Human beings' pursuit of a better life for themselves has led to unlimited demands on nature, deteriorating the global environment day by day. Wastewater containing a large amount of carcinogenic and teratogenic organic matter has become the chief culprit of water pollution. For example, Rhodamine B (Rhodamine B, referred to as: RhB) synthetic wastewater can cause subcutaneous tissue sarcoma. In order to reduce the harm of the organic matter to the environment and human beings, it is a green, energy-saving and sustainable technology to degrade the organic matter into non-toxic and harmless small molecular substances by photocatalytic redox reaction. Using semiconductors as photocatalysts and using sunlight as a light source, semiconductor...

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Problems solved by technology

For example, some researches will MoS 2 Introduction of UiO-66-NH 2 Get MoS 2 / UiO-66-NH 2 Composite photocatalysts, some studies have also introduced CdS into UiO-66 or UiO-66-NH 2 Get CdS / UiO-66 and CdS / UiO-66-NH 2 Composite photocatalysts, but in the aforementioned composite catalysts, MoS 2 The preparation conditions are relatively harsh, and dangerous chemicals are usually used, which will cause certain pollution to the environment; while CdS has strong photocorrosion, and S 2+ It is easy to be autoxidized by photogenerated holes during the photocatalytic reaction, which reduces the photostability and easily releases toxic heavy metals (Cd 2+ ) into the environment, causing secondary pollution

Moreover, the photogenerated carrier recombination rate of the aforementioned composite catalyst is fast, the electron transport ability is poor, and the photocatalytic degradation performance is poor.

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