In this study, we report the synthesis of PVA/Mg-Al-OH layered double hydroxide composite film by a sonochemical method under different reaction proceedings. The prepared nanocomposites were characterized by X-ray powder diffraction analysis (XRD), Ultraviolet-visible (UV-Vis) spectroscope, Scanning electron microscope (SEM), Energy-dispersive X-ray spectroscope (EDS), and Fourier transform infrared (FTIR) spectroscopes to study structural, optical, and morphological properties. The basal spacing of PVA/Mg-Al-OH composite increased from 7.694Å to 8.424 Å and the basal spacing of layered double hydroxide enlarged after PVA attached to the surface effects. The average size of particles was determined 23.4 and 4.48 nm. The decrease of particle size explained by the influence of organic groups on the stability of the structure. The optical band gap of PVA/Mg-Al-OH layered double hydroxide was estimated to be 0.64 eV and 0.9 eV, respectively

In the presented research work, zinc and aluminum containing layered double hydroxides on the polyvinyl alcohol matrix (ZnAl LDH/PVA) were prepared by the co-formation technique and characterized by X-ray diffractometer, Brunauer-Emmett-Teller (BET) and Ultraviolet-visible (UV-Vis) spectroscopy. Both low and high pH is determined as optimal pH for Patent Blue V (PBV) adsorption on the ZnAl LDH/PVA nanocomposite and it is explained by the fact that the dye molecule is zwitterionic. Sorption of Patent Blue V food additive (E 131) on the obtained nanocomposite was studied by Temkin, Freundlich, Langmuir, and Dubinin-Radushkevich (D-R) isotherm models. Based on the obtained isotherm curves, the adsorption of PBV more closely matches Temkin model. The regenerated nanocomposite shows higher adsorption because the specific surface area increased from 5m2 g-1 to 8.94 m2 g-1 by BET analysis