a study on adsorption of luteolin dye with zn/al layered double hydroxide (zn/al-ldh)

Recently, the tendency for using natural dyes in textiles, food, cosmetics, etc. has enhanced due to their safety and biodegradability. moreover, the natural dyes have some inherent advantages such as no health hazards, easy extraction and purification, no effluent generation, very high sustainability and renewable sources. however, most natural dyes are susceptible relative to light, heat, ph and oxidation. there are various methods for stabilizing dyes. in this study, the layered double hydroxide (ldh) was used for the stabilization of luteolin dye obtained from reseda luteola as an antioxidant. layered double hydroxides (ldhs) are lamellar inorganic solids with a brucite-like structure similar to hydrotalcite, where the partial substitution of trivalent for divalent cations results in a positive sheet charge, compensated by anions situated in the interlayer galleries. in this study zn/al-ldh was synthesized by the co-precipitation method as an adsorbent and luteolin dye was intercalated inside it by mechanical mixing. the results showed that the ldh is effective for the adsorption and stabilization of luteolin dye. luteolin dye was adsorbed by the zn/al-ldh over 24 hours with an efficiency of 93 percent in water with ph=7 and room temperature.

A study on adsorption of luteolin dye with Zn/Al layered double hydroxide (Zn/Al-LDH)

Recently, the tendency for using natural dyes in textiles, food, cosmetics, etc. has enhanced due to their safety and biodegradability. Moreover, the natural dyes have some inherent advantages such as no health hazards, easy extraction and purification, no effluent generation, very high sustainability and renewable sources. However, most natural dyes are susceptible relative to light, heat, pH and oxidation. There are various methods for stabilizing dyes. In this study, the layered double hydroxide (LDH) was used for the stabilization of luteolin dye obtained from reseda luteola as an antioxidant. Layered double hydroxides (LDHs) are lamellar inorganic solids with a brucite-like structure similar to hydrotalcite, where the partial substitution of trivalent for divalent cations results in a positive sheet charge, compensated by anions situated in the interlayer galleries. in this study Zn/Al-LDH was synthesized by the co-precipitation method as an adsorbent and luteolin dye was intercalated inside it by mechanical mixing. The results showed that the LDH is effective for the adsorption and stabilization of luteolin dye. luteolin dye was adsorbed by the Zn/Al-LDH over 24 hours with an efficiency of 93 percent in water with pH=7 and room temperature.