| Summary: | CuInS<sub>2</sub>/Mg(OH)<sub>2</sub> (CIS/Mg(OH)<sub>2</sub>) nanosheets have been prepared for the visible light activated photodegradation of tetracycline hydrochloride (TCH). The introduction of CuInS<sub>2</sub> has proven to enhance the photocatalytic activity of Mg(OH)<sub>2</sub> nanosheets. It’s ascribed to the enhanced transfer and separation of charge carriers at the junction interface between CuInS<sub>2</sub> and Mg(OH)<sub>2</sub>. The photocatalytic activity of obtained CIS/Mg(OH)<sub>2</sub> is greatly affected by CuInS<sub>2</sub> content, pH value, and inorganic ions. Among these samples, 2-CIS/Mg(OH)<sub>2</sub> exhibits the excellent photocatalytic activity and durability for the visible light driven removal of TCH after five cycle times. Atomic force microscope (AFM) images indicate that the surface roughness of 2-CIS/Mg(OH)<sub>2</sub> is intensively influenced in adsorption-photocatalysis process. The •O<sub>2</sub><sup>−</sup> and •OH radicals are vital for the visible light driven photocatalytic activity of 2-CIS/Mg(OH)<sub>2</sub> for TCH removal.
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