Method for preparing porous titania bulk material by surface oxidation of porous titanium

Abstract

The invention belongs to the crossing field of porous metal material and metal material surface treatment, and particularly relates to a method for preparing a porous titanium dioxide block material from porous titanium surface oxidation. A pore forming agent and titanium powder are proportioned according to a volume ratio of 1:10 to 1:1; mechanical mixing is performed; the materials are charged into a stainless steel mold padded with carbon paper; pressed blank block bodies are put into a vacuum drying box for removing the pore forming agent; the materials are put into a quartz furnace capable of being filled with flowing gas, the porous titanium material is sintered; after the temperature reduction, water vapor subjected to deoxidation treatment is filled into the furnace body at the speed being 100 to 200 mL / s; a pure rutile type titanium dioxide layer is generated on the porous titanium surface; after the reaction is completed, a water vapor inlet is closed; the temperature of the furnace body is lowered to a room temperature. The method provided by the invention has the advantages that the quartz heating furnace is used for simultaneously performing material sintering and surface water vapor reaction so as to obtain porous titanium dioxide materials with different surface crystal forms.

Description

technical field [0001] The invention belongs to the cross field of porous metal material and metal material surface treatment, and is a new material preparation method for preparing porous metal titanium material by sintering powder metallurgy method and then treating the surface atmosphere of the material, specifically preparing porous titanium dioxide block by surface oxidation of porous titanium body material method. Background technique [0002] TiO 2 Photocatalytic technology is widely used in the treatment of water pollutants. It mainly achieves the purpose of degradation through the reaction of generated oxygen-containing free radicals with pollutants in water, and has a very effective purification effect on environmental hormones. In this regard, in recent years, scientists from various countries have conducted in-depth research and found that the use of large specific surface area, porous inert adsorbents such as zeolite, SiO2, refractory bricks, etc. Surface enri...

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Problems solved by technology

The first is TiO 2 The immobilization method can be divided into two forms: one is to directly sinter or deposit TiO 2 The catalyst is deposited on the inner wall of the reactor, which has a low reaction rate and poor impact resistance; the other is the filling type, that is, the semiconductor is sintered on the surface of the carrier, and then the carrier is filled into the reactor. This method can save the photocatalytic separation , The cumbersome process of recycling, but the sintering performance is difficult to control, and the structural properties of the prepared materials are poor

The second type is the sol-gel method, which uses the hydrolysis of titanium inorganic salts or titanates to prepare TiO 2 sol, and then apply the sol on the flake carrier or immerse the granular carrier in the sol, make it solidify at 100°C or in a natural state, and then sinter at a certain temperature, but this method is cumbersome and the sintering performance of the material is still Difficult to control, poor material structure stability

However, this method is only a simple preparation process of titanium dioxide photocatalytic raw materials. It only uses titanium and water vapor / water vapor mixed gas to prepare titanium dioxide photocatalytic materials, and has not been used in the preparation of porous titanium dioxide material functional materials.

And this method is to ensure that the titanium plate is fully oxidized to obtain a single titanium dioxide material, so the reaction time is long

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