Abstract
<p>Layered double hydroxide of Mg-Al-nitrate system (LDH) was prepared and its heat<strong>-</strong>treated products (LDHTs) were obtained by calcining the LDH at 250–750 °C, for 5 hours at atmospheric condition. The LDH and the LDHTs were used as an inorganic host for the intercalation of AQ2 via ion exchange or memory effect property by exposing the LDH and LDHTs in aqueous solution containing an anion, anthraquinone-2-sulfonate (AQ2) for the formation of an organic-inorganic layered nanohybrid materials. X-ray diffractograms showed that the layered structure of LDH collapsed when it was heated at around 350 °C, and an oxide phase, MgAl<sub>2</sub>O<sub>4</sub> appeared. Due to the memory effect property, the regeneration of LDH from LDHT was observed and at the same time the AQ2 was intercalated when LDHT was treated with the aqueous solution containing AQ2. As a result, formation of an organic-inorganic layered nanohybrid material was also observed. Similarly, the same material can be formed by ion exchange of LDH with AQ2. The basal spacing of LDH was found expanded from 8.1 Å to around 20 Å in the resulting nanohybrid. This is to accommodate a bigger size of the AQ2 moiety with specific orientation inside the interlamella of the inorganic layered structure that warrants the layer expansion. Incomplete intercalation and ion exchange process resulted in a mixed LDH and a nanohybrid phase as observed in the PXRD pattern of the resulting material.</p>
Highlights
Layered double hydroxide (LDH) is a type of material known as anionic clay
It was found that the percent uptake of AQ2 increased with the calcining temperature of the LDHTs in the conditioned method compared to a decreasing trend in the direct method
This study shows that synthetic LDH and its calcined products could be used as an absorbent for anthraquinone-2-sulfonate removal
Summary
Layered double hydroxide (LDH) is a type of material known as anionic clay. This material is considered as antitypes of 2:1 (three-layer) clay mineral of cationic clay group, the common clays that can be found abundantly in nature such as montmorillonite, vermiculite, mica, etc. An AQ2 intercalated by ion exchange shows expansion of the LDH inorganic lamella from 8.1 to 20.1 Å (Table 1), indicating that the nitrate in the inorganic lamella was exchanged with the AQ2 in the aqueous solution, resulting in the formation of a new nanohybrid layered materials.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
