Determination of impurities in bismuth tungstate synthesized by hydrothermal method and purification method of bismuth tungstate
A purification method, bismuth tungstate technology, applied in chemical instruments and methods, inorganic chemistry, measuring devices, etc., can solve the problems of factors affecting accuracy, complicated operation, multiple measurement ranges, etc., and achieve impurity quantification, easy operation and impurity content The effect of large range and simple quantification of impurities
Active Publication Date: 2021-05-25
CHINA UNIV OF MINING & TECH
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The existing methods for determining the content of tungsten oxide include: photometry, polarography, atomic absorption spectrometry, inductively coupled plasma mass spectrometry, etc. Among them, the first three methods have complicated operations, lengthy steps, and many factors affecting accuracy and measurement range. minor issues
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[0018]The following combined with specific embodiments and the drawings are specifically described in the present invention.
[0019]The method of tungstate containing tungstate containing tungsten containing tungsten hydrothermium synthesis of hydrothermalization of the present invention:
[0020]1) The nitric acid solution of 1.5 m in advance is disposed, and the pentaque nitrate and sodium tungstate are dispersed in the placed solution, and the magnetic force is stirred for 1 h to obtain the precursor I1. The five-nitrate is dispersed in a nitric acid solution, and the magnetic force is stirred for 30 min to obtain a solution A. The sodium tungstate was dissolved in ultrapure aqueous solution, and the magnetic force was stirred for 30 min to obtain solution B, and the solution B was slowly poured into A, and then the magnetic force was stirred for 30 min to adjust the pH to 0.97 to obtain the precursor II.
[0021]2) Transfer the precursor I, the precursor II, and the precursor II is tran...
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The invention discloses a method for measuring impurities of bismuth tungstate synthesized by a hydrothermal method and purifying bismuth tungstate. The bismuth tungstate synthesized by a hydrothermal method is dispersed in a nitric acid solution, soaked and centrifuged to obtain a supernatant, and diluted to an appropriate multiple; Disperse bismuth tungstate in sodium hydroxide solution, heat to boiling and cool down, then centrifuge to take the supernatant, add a small amount of concentrated nitric acid after dilution to make the solution weakly acidic; use inductively coupled plasma mass spectrometer to measure its bismuth element, tungsten Element concentration; calculate the weight of the corresponding impurity, so as to obtain the content of the impurity in the original product. The purified bismuth tungstate is separated from the solution by using a Buchner funnel, washed and dried, and weighed by a balance. The mass difference before and after purification of the bismuth tungstate is the mass of impurities. Compared with the results of inductively coupled plasma mass spectrometry, mutual verification. The method of the invention is simple and easy to quantify the impurities, has a large range of measuring the impurity content and is relatively accurate, and the purification method has great significance for the in-depth research of the bismuth tungstate photocatalyst.
Description
Technical field[0001]The present invention relates to a method of impurities determination and purification of bismuth hydrorate, specifically a hydrothermal heteropathy assay and a ruthenate purification method of hydrothermalism.Background technique[0002]In recent years, bismuth hydrate and its modified photocatalyst have been stable in properties and high performance to become a hot spot in the field of photocatalytic. In many methods of synthetic tungstate, the hydrothermal method is favored by its simple and easy operating, high yield, low cost, etc. However, in the process of hydrothermalization, the raw material five-water nitrate and sodium dihydrate sodium dihydrate are hydrolyzed under certain acid-base conditions, producing a precipitate, and finally in the form of impurities in the formation of tungstate, It not only affects its purity and photocatalytic performance, but also is not conducive to the depth of tungstate and its modified catalyst.[0003]There is no method fo...
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IPC IPC(8): C01G41/00G01N27/62G01N5/04G01N27/626
CPCC01G41/00G01N27/62G01N5/04C01P2002/72C01P2004/03C01P2002/82C01P2004/30
Inventor 俞和胜刘嘉友聂倩倩崔云佩张克非王腾呼丽珍
Owner CHINA UNIV OF MINING & TECH