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The chemical modified silica nanoparticles with a polyphenol compound were synthesized as a sorbent nanocomposite for U (VI) removal from the aqueous phase. The prepared Pyrogallol silica nanocomposite (PSCN) was described by some specific analysis. The experiments were carried out in a batch system. The maximum sorption capacity of the nanocomposite reached 58.45 mg/g at optimum operating conditions (sorption time 50 min, pH 5, dose 0.2 g, 100 mg/l of U (VI) and 30 °C). The sorption procedure was an exothermic system and the results were in good agreement with pseudo-second-order (R2 > 99) and Langmuir isotherm (R2 > 97). Regeneration and recycling studies indicate that the prepared nanocomposite has good effectiveness for up to five cycles.