Removal of Anionic Dyes from Water using Polyethylene Glycol Modified Ni‐Al‐layered Double Hydroxide Nanocomposites

Abstract

The existence of several harmful organic dyes in wastewater let off from many industries is one of the major global environmental concerns. Owing to these apprehensions, this study aims to enhance the removal of organic dyes from wastewater using NiÀ Al-layered double hydroxides (NiÀ Al-LDH) modified with varying molecular weights of polyethylene glycol (PEG). The PEGÀ Ni-Al-LDH (PNAL) nanocomposites were synthesized by co-precipitation method and characterized using powder XRD, FESEM, EDAX and TGA. The adsorption performance of PNAL composites towards acid blue-113 (AB-113) and methyl orange (MO) dyes in aqueous media were investigated. The adsorption results revealed that 6PNAL can remove 94.11% of AB-113 and 98.29% of MO dyes in 20 min. The adsorption processes are spontaneous and endothermic in nature, and followed the pseudo-second-order model. The adsorption isotherms were best described by the Langmuir isotherm model. The reusability studies of 6PNAL nanocomposite for removal of MO and AB-113 dyes from aqueous solution can be significantly implicated for removal of aforementioned dyes from wastewater.[a] S. Natarajan, R. Naresh, Dr. V. Thiagarajan