| http://www.w3.org/ns/prov#value | - A process for the preparation of a porous heteropolycondensate adsorbent, comprising:(i) forming a reaction mixture comprising:(a) at least one hydrolysable silicic acid derivative of the general formula I: SiR4 (I) wherein each R is selected from the group consisting of hydrogen, halogen, alkoxy and --NR'2, wherein each R' is a hydrogen atom or an
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