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Background and purpose: One of the biggest environmental problems of pulp and paper industries is discharge of colored wastewater containing lignin to environment. The aim of this study was to evaluate the TiO2 photocatalytic process Dap with iron in the presence of UV for lignin degradation. Materials and methods: This cross-sectional study was conducted at laboratory scale (in vitro) in a 2-liter reactor. The synthesis of nano was made by sol-gel method. Lignin absorption was done using UV/Vis spectrophotometry at 280 nm. The samples were estimated based on factorial method (72 samples). The SPSS software version 16.0 and Excel 2007 and regression test were used for statistical analysis. Results: The highest removal rate in the presence of UV was 95.4%, and in the presence of sunlight was 87.4%. The removal rate of lignin increased when the concentration increased from 0.15 to 0.3 g/l. In all of the pH, the removal rate increased with increasing in retention time from 15 to 120 minutes and remains slightly constant after 60 minutes. The optimum pH was obtained 7. The reaction rate increased when the concentration of nano increase and the pH decreased. Conclusion: Based on the findings, the removal rate was considerably above in visible light and in the presence of sunlight, which represented the Dap role of nanoparticle therefore, due to the low consumption, low power consumption and high efficiency, Doped nano can be used as an alternative for the removal of lignin from the pulp and paper industries.

Keywords: Lignin, degradation, photocatalytic, pulp and paper industries, TiO2

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