Acid Blue 129 and Salicylate Cointercalated Layered Double Hydroxides: Assembly, Characterization, and Photostability

Abstract

Acid Blue 129 (AB129) and salicylate have been cointercalated into the interlayer galleries of ZnAl layered double hydroxides (LDHs) through a coprecipitation method to prepare organic–inorganic hybrid pigments with improved photostability. The prepared hybrids were characterized by XRD, FTIR spectroscopy, SEM, TG-DTG-DTA, UV–vis spectroscopy, and CIE 1976 L*a*b* color scales. The results show the successful cointercalation of AB129 and salicylate into the interlayer space of LDHs, forming a new kind of organic–inorganic hybrid pigment, and reveal that intercalation into the interlayer of LDHs can slightly improve the thermal stability of AB129 as a result of the protection offered by LDH layers. The AB129/salicylate molar ratio plays an important part in the color properties of the hybrid pigment. The cointercalation of salicylate can efficiently enhance the photostability of AB129 by absorbing harmful UV rays. Therefore, the cointercalation of AB129 and salicylate into the interlayer of ZnAl LDHs can effectively produce organic–inorganic hybrid pigments with enhanced photostability.