Method for determining content of Ti in TiO2 photocatalyst
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A determination method and photocatalyst technology, applied in the field of chemical testing, can solve problems such as difficulty in directly measuring Ti content, and achieve the effect of a wide range of applications
Inactive Publication Date: 2014-12-10
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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Problems solved by technology
[0006] For TiO 2 The problem of the difficulty of directly measuring the Ti content in the catalyst, the present invention provides a strong acid dissolution combin
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Embodiment 1
[0015] Embodiment 1 relates to the preparation of Ti standard solution, the drawing of standard working curve and containing carrier catalyst TiO 2 The determination is as follows:
[0016] (1) Prepare the titanium standard solution and draw the standard working curve: dilute the titanium standard solution with 2% nitric acid to constant volume, and prepare titanium ion concentrations of 0.1 mg / ml, 0.5 mg / ml, 1 mg / ml, and 2 mg respectively / ml, 5 mg / ml, 10 mg / ml series titanium standard working solution, the linear regression coefficient R of the standard working curve obtained 2 =0.9999;
[0017] (2) Digest the carrier catalyst sample: weigh TiO with fly ash as the carrier 2 Put the photocatalyst in a polytetrafluoroethylene microwave digestion tube, add 6 ml of concentrated sulfuric acid with a concentration of 98% and 4 ml of hydrogen peroxide with a concentration of 30%, and carry out microwave digestion in a microwave digestion apparatus (conditions: step 1, temperature...
Embodiment 2
[0020] (1) Prepare titanium standard solution and draw standard working curve: Dilute the single standard solution of titanium with 2% nitric acid to constant volume, and prepare titanium ion concentrations of 0.1 mg / ml, 0.5 mg / ml, 1 mg / ml, 2 mg / ml, 5 mg / ml, 10 mg / ml series of titanium standard working solutions, the linear regression coefficient R of the standard working curve obtained 2 =0.9999;
[0021] (2) Digestion of TiO 2 Nanosheet colloidal solution: take different concentrations of TiO 2 Put 1 ml of nanosheet colloid solution in a polytetrafluoroethylene microwave digestion tube, add 5 ml of concentrated sulfuric acid with a concentration of 98% and 3 ml of hydrogen peroxide with a concentration of 30%, and react in a microwave digestion apparatus (conditions: step 1, Heating up for 8 minutes, the target temperature is 150°C; step 2, the target temperature is 170°C, holding for 35 minutes), and after cooling, set the volume to 50 ml;
[0022] (3) Determination: Tak...
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Abstract
The invention discloses a method for determining the content of Ti in a TiO2 photocatalyst and belongs to the field of chemical testing. The method comprises the following steps: adding 10-100mg of carrier catalyst into a polytetrafluoroethylene microwave digestion tube, adding 1-10ml of 98% concentrated sulfuric acid and 1-10ml of 30% hydrogen peroxide, and performing heating digestion reaction in a microwave digester, wherein the reaction temperature is controlled within 140-200 DEG C, and the reaction time is controlled within 25-55min; after the reaction is finished, a digestion solution is obtained, filtering the digestion solution, making up to the volume to 50ml, and determining the content of the Ti in a liquid supernatant by virtue of ICP-OES. The carrier TiO2 catalyst is acidized and subjected to microwave digestion pretreatment, TiO2 is converted into the Ti in a soluble ionic state, and the quick, simple and convenient method is provided for the determination of the content of the Ti in the TiO2 photocatalyst. The method is suitable for determining the content of the Ti in a TiO2 nano-sheet colloid, a TiO2 nano-tube, a thin TiO2 film and catalysts in other forms, is suitable for being used for determining the content of the Ti in the TiO2 photocatalyst after repeated reaction, and is wide in application range.
Description
technical field [0001] The invention relates to the field of chemical testing, is a kind of TiO 2 Determination method of Ti content in photocatalyst. Background technique [0002] In recent years, water pollution and air pollution have become increasingly serious. In order to effectively remove various pollutants such as refractory organic matter and SO 2 , NO x etc. Adsorption, chemical oxidation and biological methods have been applied in various fields. TiO 2 Photocatalytic technology has attracted widespread attention as an advanced oxidation technology. It is low in cost, safe, non-toxic, stable, and can react at room temperature without adding other chemical reagents. It can almost non-selectively oxidize environmental pollutants, and The final product is CO 2 、H 2 O, NO 3 - and SO 4 2- etc., without causing secondary pollution, making it more and more important as an excellent photocatalyst. [0003] Catalyst active center TiO 2 The content is an importan...
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IPC IPC(8): G01N21/71G01N1/44
Inventor 陈少华崔星石建稳叶欣林向宇
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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