| http://www.w3.org/ns/prov#value | - The amorphous titania used here can be obtained by, for example, hydrolysis and dehydration condensation of inorganic salts of titanium such as titanium tetrachloride, titanium sulfate and the like, and hydrolysis and dehydration condensation of organic titanium compounds in the presence of an acid such as tetraethoxytitanium, tetraisopropoxytitanium, tetra-n-propoxytitanium, tetrabutoxytitanium,
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