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A ternary photocatalyst of LaOCl/CeO 2 -g-C 3 N 4 was designed and firstly synthesized by a facile KCl–LiCl molten salt method. The 60 %LaOCl/40 %CeO 2 -g-C 3 N 4 with a 6: 4 weight ratio of LaOCl to CeO 2 has an optimal degradation ratio (nearly 100%) for methylene blue (MB) with an impressive cyclic stability. Both of adsorption and photodegradation contribute to the high MB removal ratio, and kinetic study results show that the rate constant of photocatalytic degradation route is 0.0174 min−1, which is less than that of adsorption process (2.4406 min−1). The excellent adsorption performance of 60 %LaOCl/40 %CeO 2 -g-C 3 N 4 is attributed to its negative zeta potential (−35.40 mV) and larger average pore size. The photochemical characterizations suggest that the 60 %LaOCl/40 %CeO 2 -g-C 3 N 4 form a dual Z-scheme heterojunction, which enhances its separation efficiency of photogenerated e - / h + with an outstanding redox ability, and further promotes the photocatalytic activity. [Display omitted] • A ternary photocatalyst of 60 %LaOCl/40 %CeO 2 -g-C 3 N 4 was firstly synthesized by a KCl–LiCl molten salt mothed. • Negative zeta potential and suitable pore structure contribute to the superb adsorption ability of 60 %LaOCl/40 %CeO 2 -g-C 3 N 4. • 60 %LaOCl/40 %CeO 2 -g-C 3 N 4 shows a dual Z-scheme heterojunction which promotes its photocatalytic property. [ABSTRACT FROM AUTHOR]