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Photocatalytic degradation (PCD) of tetramethylammonium (TMA) in water was studied using both pure TiO2 and silica-loaded TiO2 (Si–TiO2). Use of Si–TiO2 catalyst prepared from commercial TiO2 powder by a simple method developed in this work enhanced the PCD rate of TMA considerably. The Si/Ti atomic ratio of 18% was found to be an optimum in photoactivity and the calcined sample was more efficient...