: Layered double hydroxides (LDHs), a class of anionic clay nanostructures, due to the replacement of trivalent cations by divalent cations, have a positive charge on their layers. These materials are stabilized and their electric charge are balanced by the placement of anionic molecules and water molecules in their gallery space. LDHs can have divalent and trivalent cations and anions in their structures. Due to its high specific surface area, high anion exchange capacity and high porosity, these materials can place various materials including pigments, heavy metals and different pollutants in their gallery space. LDHs are also used as adsorbent for chemicals and pharmaceutical carrier due to their flexibility in structural changes. Also, LDHs because of their layered structure, porosity and semiconductor nature have photocatalytic properties that may decompose pollutants into harmless materials. In the present study, the adsorption of Disperse Blue 56 and Disperse Red 60 dyes on polyester fibers containing different amounts of LDH Zn-Fe-Ti nano-particles, which have been modified with dodecyl sulfate and a compatibilizer called polypropylene grafted maleic anhydride (PP-g-MA) was investigated. The properties of these synthesized nanoparticles were studied by X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), specific surface area analysis (BET) and dynamic light scattering analysis (DLS). The characteristics of the produced masterbatches including 5% LDH and 10% and 4% compatibilizer were evaluated with FTIR, thermogravimetric analysis (TGA) and residual ash content tests. The characteristics of fibers which were produced by mixing these masterbatches in 0.1% and 0.25% percentages in a meltspinning process were also studied by FTIR, XRD, field emission scanning electron microscopy (FESEM), light microscope, moisture absorption and tensile strength. Also, their color properties of the PET fiber modified by these LDH were studied. According to the results of X-ray diffraction test, the presence of LDH in polyester fibers caused increasing the absorption of moisture and dye by the PET fibers. Keywords: Layered double hydroxide, LDH nano-particle, Anionic clay, Polyester fiber, Disperse dyei
