Enhanced High Activity for Removal and Adsorption Process of Cationic Dye by Using Active Nanocomposite Surface: Reactivation and Isotherm Models

Abstract

In this research, a new low-cost material was synthesised multi carbon nanotube/Zinc oxide nanocomposite (MWCNT/ZnO), nanocomposite used as a sorbent for dye removal from industrial Water treatment, as like cationic model Maxillon blue (GRL) dye in order to find the adsorption mechanism of adsorption methods were studied via FESEM, TEM, and BET. Two models of Freundlich and Langmuir isotherm were studied, and according to the data, it was established that it conforms to the isotherm Freundlich estimation on the value of R2 > 0.9798. The reactivation and re-use of (MWCNT/ZnO) nanocomposite were performed by using water in the GRL dye up to Cycle 5 under the best conditions. After the 3 cycles of using (MWCNT/ZnO) nanocomposite, the efficiency is still significant (>80%) and it appears that the (MWCNT/ZnO) nanocomposite is a probable re-newable absorber, moreover, the effect of ionic strength increases the solubility of the GRL dye in aqueous medium. Thus, when salt is added, the aqueous solution decreases the removal percentage. Also, a comparison among several surfaces (ZnONPs, MWCNT, MWCNT/ZnO), found MWCNT/ZnO nanocomposite the best surfaces to remove GRL dye.