| abstract |
An object of the present invention is to provide an amorphous inorganic anion exchanger having excellent anion exchangeability and less corrosive to metals, and an amorphous bismuth compound which is excellent in anion exchangeability and less corrosive to metals. Production method.nThe amorphous inorganic anion exchanger of the present invention is characterized in that the average primary particle diameter observed by an electron microscope is 1 nm or more and 500 nm or less, and the NO 3 content is 1% by weight or less based on the whole, and is represented by the formula [1].nThe method for producing an amorphous cerium compound of the present invention is characterized in that it comprises a precipitation forming step of adjusting a pH of 12 or more by using an acidic aqueous solution containing trivalent cerium ions at a temperature higher than 0 ° C and lower than 20 ° C to form a precipitate. In the step, the amorphous cerium compound is represented by the formula [1], and the NO 3 content is 1% by weight or less, and BiO(OH) [1]. |