Black liquor produced from a pretreatment process of bioethanol using the lignocellulose material, such as an empty palm bunch. Black liquor is organic liquid waste and should be treated before release to the environment. One of the degradation processes of black liquor is by the photocatalytic reaction using the Ti-Pillared Clay (Ti-PiLC) catalyst. However, there is a limitation of process condition if using a Ti-PiLC catalyst; the degradation process should be conducted under a UV light source. This study is focused on the modification of photocatalytic catalyst Ti-PiLC by adding Zn metal (Ti-Zn/PiLC), thus the degradation process of black liquor could be conducted on a visible light source. Characterizations of the prepared photocatalysts were obtained using XRD, BET, TPD, TGA, SEM, TEM and UV-Vis spectrophotometer for the degradation degree. Although the degradation process of black liquor could be conducted on the visible light source, the degradation degree was still minor compared with only using Ti-PiLC photocatalyst. It is assumed that combination Ti and Zn as the active metals of the photocatalyst was not good enough to enhance the degradation process of black liquor even on the visible light source, perhaps using other metal, such as cerium (Ce).