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Pseudo-successive ionic layer adsorption and reaction (p-SILAR) process was opted for deposition of PbS/CdS and CdS/PbS quantum-dots (QDs) on TiO₂ to combine light absorbing tendency of PbS and CdS QDs which evolved significant photocatalytic behavior in TiO₂ under visible light irradiation. It was shown that the resultant TiO₂/PbS/CdS hierarchical nanocomposite exhibited better photo-electrochemical behavior than TiO₂/CdS/PbS, ensuing ∼42% higher degradation of acid orange-56 than the latter and ∼65% higher than pristine TiO₂. In addition, both nanocomposites resulted promising antibacterial activity against Escherichia coli (E. coli). Particularly TiO₂/PbS/CdS showed much greater inhibition zone (∼14 mm) than TiO₂ (∼8 mm).