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In this work, bismuth (Bi) and platinum (Pt) were utilized to promote the oxidation of lignosulfonate over TiO₂ under solar light illumination at facile condition. The characterization results revealed the presence of Bi and Pt covering on TiO₂ surface with zero valent state. And, the Bi1%/Pt1%-TiO₂ photocatalyst performed excellent reactivity in oxidation of lignosulfonate to produce valuable compounds and CO₂ due to the generation of photo-generated hole (h⁺) and superoxide radicals (O₂radical dot), which were confirmed by quenching experiments. After 1 h of photocatalytic reaction, almost 85% of lignosulfonate was conversed into guaiacol, vanillic acid (VA), vanillin, 4-phenyl-1-buten-4-ol and other intermediates that were identified and quantified using HPLC. We found that the amount ratio of added Bi and Pt was the essential effect to the oxidative efficiency of lignin due to the produced additional active sites on …