STUDY THE OPTIMUM CONDITIONS OF THE REMOVAL OF BROMOPHENOL BLUE DYE FROM AQUEOUS SOLUTIONS BY SYNTHESIZED NANO GRAPHENE OXIDE-METHIONINE COMPOSITE

Abstract

The The three sections of this study are the synthesis, characterisation, and use of a nano-graphene oxide-methionine composite for the elimination of certain water pollutants from aqueous solutions, specifically bromophenol blue dye. Part one contains the synthesis nano-graphene oxide-methionine (NGO-M), Part two includes the characterization of this composite by (FT-IR), also by (XRD) to find out the particles size (7.4 and 16.83 nm) for NGO, NGO-M composite respectively through Debye-Scherrer equation, and investigated the particle's surface charge using zeta potential analysis. Part three contains the application of NGO-M composite for water treatment in order to remove the organic pollutants (bromophenol blue dye BPB). Through (adsorption) of the BPB dye on the composite beads, determination the optimum conditions for composite, the results are (pH= 3, composite quantity= 2 mg, contact time= 60 min., Temperature= 55℃. dye concentration=25 mg. L-1) NGO-M composite. As well as studying the adsorption isotherm, the isotherm curves show the general adsorption isotherms of the composite is S-type according to the Gilles classification, applying Freundlich and Langmuir models. In addition, studying the thermodynamics, estimated thermodynamic for the BPB dye's adsorption on NGO-M composite, the process was endothermic, ∆H (+), ∆S (+) of he BPB dye adsorption on the composite, confirmed spontaneously of the adsorption processes ∆G (-).According to the findings, the pseudo-second order kinetic model is a more accurate representation of the adsorption behavior of BPB dye.