Herein we report the immobilization of Pseudomonas sp. in sol–gel silica matrices and its application for water treatment. Indeed, the immobilized bacteria were successfully
applied to decolorize remazol black (RB), methyl orange (MO)and benzyl orange (BO), which are azo dyes commonly used in industrial processes. To the best of our knowledge, it is the first time that sol–gel immobilized Pseudomonas sp. with excellent decolorizing ability against azo dyes has been reported