THE IMPACT OF INTERCALATED ANION ON THE ANION EXCHANGE EFFICIENCY OF LAYERED DOUBLE HYDROXIDE WITH ORGANIC INHIBITORS

Abstract

Layered double hydroxides (LDH) have been used extensively as nanocontainers of corrosion inhibitors over
the past few years. Besides the co-precipitation method, anion exchange is considered one of the effective
methods for synthesizing this type of material. In this study, LDH systems intercalated by various anions
such as CO3
2-
, NO3
-
and Cl- were used to synthesize LDH carrying the organic corrosion inhibitor 2-
benzothiazolythio-succinic acid (BTSA) through the anion exchange method. The influence of intercalated
anions on the exchange efficiency, structure, and composition of LDH nanocontainer systems was clarified.
The analytical results show that LDH-NO3 and LDH-Cl have effective anion exchange capabilities with
BTSA. In contrast, LDH-CO3 did not exhibit this property due to the strong affinity of carbonate anions with
the hydroxide layer. After 24 hours, the anion exchange process reached saturation, and nanocontainer
products using LDH-Cl and LDH-NO3 precursors achieved 37,6 and 39,2 wt% BTSA loading capacity