CdS-pillared CoAl-layered double hydroxide nanosheets with superior photocatalytic activity

• CdS nanocrystals were intercalated into CoAl-LDH interlayer.
• The nanohybrid display superior visible-light photocatalytic activity.
• A photoexcitation model for the pillared heterostructured system was proposed.

A new nanohybrid was synthesized by mixing the positively charged 2D nanosheets of CoAl-layered double hydroxide (CoAl-LDH) and the negatively charged CdS nanosol suspensions. It was revealed that the CdS nanoparticles were intercalated into the interlayer region of CoAl-LDH with a spacing of 2.62 nm. The obtained nanohybrid exhibited a mesoporous texture with an expanded specific surface area of 62 m2 g−1 and a superior photocatalytic activity in the degradation of acid red with a reaction constant of 1.26 × 10−2 min−1 under visible-light radiation, which is more than 2 times those of his parents CoAl-LDH and CdS.

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