Method for rapidly characterizing purity of titanium dioxide

Abstract

The invention relates to a method for rapidly characterizing purity of titanium dioxide, and belongs to the technical field of analysis and detection. According to the method, on the basis of a TiO2 synchrotron radiation XRD detection result, a multiphase TiO2 content standard curve is established with data of a Raman spectroscopy method or an electrochemical characterization method respectively. According to a Raman spectrum detection method, the strongest characteristic peak of corresponding phase TiO2 is found in a Raman spectrogram, according to the electrochemical characterization, corresponding phase TiO2 lithium intercalation peaks are found in a capacity differential curve, peak areas are fitted respectively, the peak area of a to-be-detected phase is divided by the total peak area, the obtained ratio is used as a horizontal coordinate, the content refined by synchrotron radiation XRD is used as a vertical coordinate, and TiO2 content standard curves are respectively established so as to be a basis for quantitative detection of TiO2 with a unknown phase content. The method is suitable for quantitative determination of specified-phase TiO2 in multiphase TiO2; a standard curve is established based on data with statistical significance so that the detection result is more accurate; and two detection modes of Raman detection and electrochemical detection are provided, and an application field is wide.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, in particular to a titanium dioxide purity detection method based on synchrotron radiation XRD combined with Raman spectrum or electrochemical characterization. [0002] technical background [0003] Titanium dioxide, the chemical formula is TiO 2 , is an inorganic substance, and there are four phases at room temperature, namely the anatase phase TiO 2 (TiO 2 (A)), rutile phase TiO 2 (TiO 2 (R)), brookite phase TiO 2 , bronze phase TiO 2 (TiO 2 (B)), TiO 2 It has extensive and important applications in industry, medicine, food, cosmetics, environmental protection, etc., especially in the fields of energy and materials, TiO 2 It is a very promising anode material for lithium-ion batteries. Currently, TiO 2 The preparation methods of materials mainly include solvothermal method, ion exchange and solid state reaction method, etc., but pure phase TiO 2 The material is difficu...

AI Technical Summary

Problems solved by technology

The shortcoming of this detection method is: (1) the establishment of standard curve is based on known sample ratio, can not use this method to establish content standard curve for the material that is difficult to obtain pure phase, should have limitation in application; ( 2) The single-point scanning Raman test is not statistical and has a large chance. The resulting content detection curve is not accurate enough, which affects the accuracy of the detection results

This detection method can use this method to establish a content standard curve for substances that are difficult to obtain pure phases. However, the disadvantages are: the lithium intercalation amount is inconsistent in different literature reports, and the electrochemical content calculation formula based on the lithium intercalation amount is inaccurate. Therefore, the sample content calculated by the electrochemical method cannot be used as the abscissa of the Raman standard curve, and there are big problems in the established Raman-based content detection curve, which affects the accuracy of the detection results.

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