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Titanium dioxide (TiO 2) is an effective photocatalyst for organic removal. However, its efficacy is hampered by the recombination of photogenerated electrons and holes. This paper presented an eco-friendly, synthetic lanthanum (La)/TiO 2 supported on lithium silicon powder (L) to significantly improve photocatalysis. The results showed that 74.4% dimethyl phthalate (DMP) removal was achieved in the ultraviolet (UV)-La-TiO 2 /L (LTL1) system, which was considerably higher than UV-TiO 2 /L (TL) (60.1%) and UV-L (18.3%). The enhanced LTL1 photocatalysis was based on the synergic effect between TiO 2 and La with L matrix. The photocatalysis efficiency was further improved by hydrogen peroxide (H 2 O 2), while the DMP removal rate reached 100% in the UV-LTL1-H 2 O 2 system. The DMP activation mechanisms and degradation pathways in the UV-LTL1-H 2 O 2 system were carefully examined, revealing that increased hydroxyl free radical (OH•) and superoxide ion radicals (O 2 −•) were pivotal to the higher degradation rate. Overall, the findings suggested that LTL1 showed considerable application promise for the low-cost and eco-friendly organic removal from water. [Display omitted] • TiO 2 photocatalytic effectiveness was significantly enhanced via supported on L. • LTL1 performed outstanding photodegradation for DMP in the UV-H 2 O 2 system. • UV-LTL1-H 2 O 2 systems can effectively eliminate DMP in a wide range of pH. [ABSTRACT FROM AUTHOR]