Adsorption performance of modified graphene oxide nanoparticles for the removal of toluene, ethylbenzene, and xylenes from aqueous solution

Abstract

A B S T R A C TThe purpose of this study was to investigate the effect of graphene oxide nanoparticles modified with 4-aminodiphenylamine (GO-A) on the removal of toluene, ethylbenzene, and p-,o-xylene (TEX). Nano-sorbent was characterized using Fourier transform infrared resonance spectroscopy, carbon, hydrogen and nitrogen elemental analysis, BrunauerEmmett-Teller analysis, and transmission electron microscopy. The effect of different experimental parameters including contact time, pH, and initial concentration of adsorbate and adsorbent were examined. According to the results, an optimum TEX removal efficiency was observed at contact time = 5 min, pH 4, and adsorbent dose = 1 g/L at 20 mg/L initial TEX concentration. Besides, the point of zero charge (pH pzc ) was evaluated to be 4. The adsorption isotherms (Langmuir, Freundlich, and Dubinin-RadushKevich) and kinetics (pseudo-first-order, pseudo-second-order, intraparticle diffusion, and Elovich) were used to indicate the isotherm and kinetic parameters. The adsorption process followed Langmuir isotherm and pseudo-second-order kinetic. Finally, GO-A was regenerated at seven cycles for the TEX removal confirming its good regeneration capacity.

Sustainable Synthesis of High-Surface-Area Graphite Oxide via Dry Ball Milling

“…For ball milling with the zirconia balls, the average pore sizes were 4.7, 4.5, and 4.2 nm. Similar average pore sizes of GO (4.8 nm; Hummers method) have been reported in the literature …”

“…Similar average pore sizes of GO (4.8 nm; Hummers method) have been reported in the literature. 47 Product Composition. For milling with stainless-steel balls, elongation of the milling time resulted in an oxygen increase from 2.54 to 13.24% for pristine graphite and C-24h, respectively (Figure 5).…”

Graphene and Graphene Oxide-Based Composites for Removal of Organic Pollutants: A Review

“…The regeneration of GO-A was also studied, for which even after three cycles the GO-A performed well as an adsorbent, and only after seven cycles did their adsorption intensity decline. 266 Nanoporous graphene was used for the removal of benzene, toluene, and xylene and 119, 123, 125 g of benzene, toluene, and xylene were efficiently adsorbed by 1 g of nanoporous graphene. The time taken for this process was rapid and was completed in about a minute.…”

“…Several factors such as time, pH, and adsorbate concentration affected the adsorption process and at pH 4 the adsorption was found to be at maximum, and an increase in the adsorbate concentration increased the adsorption capacity. The regeneration of GO-A was also studied, for which even after three cycles the GO-A performed well as an adsorbent, and only after seven cycles did their adsorption intensity decline . Nanoporous graphene was used for the removal of benzene, toluene, and xylene and 119, 123, 125 g of benzene, toluene, and xylene were efficiently adsorbed by 1 g of nanoporous graphene.…”

Photocatalytic Degradation of Total Organic Carbon in Water by under UV Irradiation on Graphene Oxide

“…As previous studies widely reported that point of zero charge (pzc) of the GO is pH ~4 [33] so, the GO surface will be remain positively charged in acidic medium (pH < 4) and negatively charged in alkaline medium (pH > 4). Carbonyl groups of humic acid protonated and deprotonated on the pH of reaction mixture.…”