Enhanced adsorption of chlorogenic acid polyphenol by layered double hydroxide modified with sodium dodecyl sulfate

Abstract

Polyphenols are a class of organic contaminants highly present in wastewater from industrial and agro-industrial processes. Adsorptive processes are employed to remove contaminants from effluents without the generation of by-products. Among the challenges in removal is the search for adsorbents that have affinity and favor the interaction with the contaminant. In this sense, this paper aimed to evaluate a layered double hydroxide modified with sodium dodecyl sulfate as an adsorbent material of the chlorogenic acid polyphenol. Carbonated magnesium-aluminum hydrotalcite was the layered double hydroxide employed for modification at different sodium dodecyl sulfate contents. The results showed that the modification with 50% w w-1 sodium dodecyl sulfate increased the adsorptive capacity of the modified layered double hydroxide from 0.030 mg g-1 to 2.3 mg g-1 after 24 hours of contact with the polyphenol. Thus, the use of sodium dodecyl sulfate for surface modification of layered double hydroxide indicated positive results that favor the application of the modified material in the removal of polyphenols.