Method for preparation of TiO2 by steam hot solution evaporation

Abstract

The invention discloses a method for preparation of TiO2 by steam hot solution evaporation. The method includes: dripping a titanium salt into an organic solvent, performing magnetic stirring and mixing, transferring the mixture into a standing quartz cup, then adding an organic solvent into a Hadtelloy alloy reaction kettle, and putting the standing quartz cup into the reaction kettle, carrying out steam hydrothermal reaction for 5h, then introducing cooling water to a condenser pipe in the reaction kettle to rapidly lower the temperature inside the kettle, after cooling to room temperature,taking out the product from the cup, when the product in the cup is in a solid state, performing levigating to obtain a TiO2 photocatalyst, and when the product in the cup is in a liquid state, conducting solid-liquid separation, then adding ethanol and performing washing, and then conducting drying in a vacuum oven to obtain the TiO2 photocatalyst. The TiO2 photocatalyst obtained by the method provided by the invention has the characteristics of excellent catalytic performance and simple and safe preparation process, and has good application prospects in the field of photocatalysis.

Description

technical field [0001] The present invention relates to the preparation of TiO by steam thermal solution evaporation 2 The method belongs to the field of photocatalyst technology. Background technique [0002] TiO 2 It has broad application prospects in the field of photocatalytic degradation, TiO prepared by conventional methods 2 The (101) crystal plane is usually exposed in the crystal, and the disadvantages of the (101) plane are low carrier mobility and few reactive sites. [0003] The researchers found that TiO 2 The (001) face has a high density of active unsaturated Ti atoms, which has a higher photocatalytic activity than the (101) face. Therefore, the exposed TiO on the (001) plane 2 It has great application potential in the field of photocatalysis. In order to expose the (001) plane during crystal growth, it is usually necessary to add F-ions such as strong corrosive hydrofluoric acid, or strong oxidizing agents such as H 2 o 2 , Adding these substances wi...

AI Technical Summary

Problems solved by technology

But there are also some deficiencies. Firstly, the conventional hydrothermal reaction prepares TiO 2 In the process, water is used as a solvent, and the hydrolysis reaction rate is fast, so the hydrolysis process is difficult to control, and the prepared sample has large particles and small specific surface area, which is not good for photocatalytic degradation performance. In order to solve this problem, a dispersant is usually added to the reaction solution , will face the problem of being difficult to clean

Secondly, when preparing samples by the conventional hydrothermal method, the reaction temperature is usually below 220°C due to the limitation of the reaction kettle itself, because the polytetrafluoroethylene lining in the reaction kettle will be seriously deformed at 230°C, resulting in poor sealing and easy explosion hazard

However, the lower reaction temperature will lead to a low degree of crystallization of the sample, and subsequent heat treatment is required for further crystallization.

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