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New CuS nanocrystals with a 3D hierarchical branched structure are successfully synthesized through  in situ  consecutive reaction method with copper foam as template. The formation mechanism of the 3D hierarchical branched structure obtained from the secondary reaction is investigated by adjusting the reaction time. The morphology of CuS nanosheet arrays with the 3D hierarchical branched structure is changed through Cu 2+  exchange. In this method, the copper foam reacted completely, and the as-synthesized CuS@Cu 9 S 5  nanocrystals are firmly grown on the surface of the 3D framework. This tunable morphology significantly influence the physical and chemical properties, particularly catalytic performance, of the materials. The as-obtained material of Cu@CuS-2 with the 3D hierarchical branched structure as catalyst for methylene blue degradation exhibits good catalytic performance than that of the material of Cu@CuS with 2D nanosheets in dark environment. Furthermore, the cation exchange between Cu and Cu 2+  indicates that Cu 2+  in wastewater could be absorbed by Cu@CuS-2 with the 3D hierarchical branched structure. The exchanged resultant of CuS@Cu 9 S 5  retains its capability to degrade organic dyes. This  in situ  consecutive reaction method may have a significant impact on controlling the crystal growth direction of inorganic material.

Consecutive Reaction to Construct Hierarchical Nanocrystalline CuS “Branch” with Tunable Catalysis Properties