Photocatalytic Degradation of Anionic Dye by Zn-substituted Layered Double Hydroxide in Aqueous Solution

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Preparation of layered double hydroxide (LDH) by substituting Zn in the structure was attempted to create an environmentally friendly photocatalyst with anion adsorption capacities. Zn-Al-substituted LDH with different Zn/Al molar ratios of 2, 3, and 4 were synthesized. The behavior of each synthetic Zn-Al LDH in photo-induced degradation of an anionic dye, sulforhodamine B, in aqueous solution was evaluated by determining the ultraviolet-visible absorption spectra under ultraviolet light irradiation. Zn-Al-substituted LDH showed photocatalytic activity toward sulforhodamine B, and degradation of sulforhodamine B was accelerated without stabilization under ultraviolet irradiation. Furthermore, the results suggested that Zn-Al LDH with a high charge density was more effective for continuous photo-induced degradation of sulforhodamine B in aqueous solution compared with Zn-Al LDH with a low layer charge. Zn-Al-substituted LDH should be useful as efficient photocatalysts for harmful organic anions.
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