Adsorption of Yellow GX Pigment by Mg-Fe-layered Double Hydroxide from Aqueous Solutions in Textile Industry

In the present work, adsorption of Yellow GX (YGX) pigment by layered double hydroxides from aqueous solutions of wastewater textile industry was investigated. At first we describe our attempts to synthesize Mg-FeLDH was prepared by dropwise addition of a mixed aqueous solution of Mg(NO3)2.6H2O and Fe(NO3)3.9H2O at pH= 9-10 followed by subsequent hydrothermal treatment for 24h in the mixture of water,1-propanol and surfactant (Ethylene glycole).This nanostructured particle is well characterized by infrared spectroscopy, Scanning electron microscope (SEM) and X-ray powder diffraction analysis. SEM images showed that the morphology of Mg-FeLDH is plate-like structure. XRD analysis showed the formation of sharper and intense peaks, which might indicate the larger crystallites size of LDH as well as higher crystallinity. The FT-IR spectra of LDH materials provide many important information, especially about the interlayer anions and hence are very useful to understand the structure of these materials.The ability of these compounds to adsorb YGX pigment by ion exchange in pH=2-12, different temperature (35°C, 45°C, 55°C) has been evaluated by UV-Vis spectrophotometer. The adsorption experiments show that the amount of YGX adsorption increases with increasing temperature. This suggests that the interaction of adsorbate and adsorbent is endothermic in nature. Furthermore, it supports the surface heterogeneity of oxide surfaces.