Novel approach to fabricate organo-LDH hybrid by the intercalation of sodium hexadecyl sulfate into tricalcium aluminate

Abstract

In this work, a simple but efficient approach to synthesize sodium hexadecyl sulfate (SHS) intercalated layered double hydroxide (CaAl-LDH-SHS) is proposed. By intercalating SHS ions into the hydrates of C3A, CaAl-LDH-SHS is successfully prepared within 2h at 25°C. In order to understand the intercalation behavior and structure of the products, various techniques such as powder X-ray diffraction (XRD), thermogravimetric-differential thermal analysis (TG-DTA), scanning electron microscopy (SEM) and mid-infrared (MIR) spectroscopy combined with near-infrared (NIR) spectroscopy were adopted. The XRD analysis revealed that SHS was successfully intercalated into the hydrate of C3A, with an expanded basal spacing d(001) of 2.66nm. The CH and SO stretching vibrations observed in the FT-IR spectra further evidenced the presence of SHS in the resulting products. The average platelet diameter of 1–2μm and average thickness of 20–30nm of CaAl-LDH-SHS were obtained from the SEM image and XRD analysis.