en عمومى General مقاله اصیل Original Article <pre> <span style="font-family:Times New Roman;"><span style="font-size:12px;"><strong>Background: </strong>To remove methylene blue (MB) from aqueous solutions, nanoscale zero-valent iron (nZVI) predicated on reduced expanded graphene oxide (rEGO) was used as the activator of persulfate.</span> <span style="font-size:12px;"><strong>Methods: </strong>Scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) analyses were used to investigate the surface morphology and to examine the surface elemental composition. X-ray diffraction (XRD) was used to determine the chemical compositions of the synthesized compound. In this study, the effects of pH (3-9), activator dose (0.4-1.6 g L-1), persulfate concentration (0.192-0.768 g L-1), and reaction time (0-60 minutes) on the removal of 10 mg L-1 MB were studied by nZVI -reduced expanded graphene oxide/persulfate (nZVI@rEGO/PS) process.</span> <span style="font-size:12px;"><strong>Results: </strong>The maximum removal efficiencies of MB at optimum operational conditions (pH 3, activator dose = 1.2 g L-1, persulfate concentration = 0.576 g L-1, and reaction time = 20 minutes) by nZVI@rEGO/PS process was 96%. The chemical method was used to prepare expanded graphene. The volume of natural flake graphite increased about 25 times after the process. SEM image of the nZVI@rEGO showed the presence of nZVI placed on the EGO surface in chain structure with a diameter about 100 nm. The EDS analysis of the activator indicated the existence of Fe element to an amount greater than 50%.</span> <span style="font-size:12px;"><strong>Conclusion: </strong>According to the results, nZVI@rEGO is considered as a promising activator of persulfate.</span></span></pre> Persulfate, Methylene blue, Graphite, Graphene oxide, Kinetics 15 24 http://ehemj.com/browse.php?a_code=A-10-1-195&slc_lang=en&sid=1 Alaa Mohamad Soubh soubh@ut.ac.it 10031947532846007712 10031947532846007712 Yes Corresponding author: School of Environment, College of Engineering, University of Tehran, Tehran, Iran Mohammad Ali Abdoli mabdoli@ut.ac.ir 10031947532846007713 10031947532846007713 No School of Environment, College of Engineering, University of Tehran, Tehran, Iran Lorin Ali Ahmad lorin.ali55@ymail.com 10031947532846007714 10031947532846007714 No Tartus Research Center, General Commission for Scientific Agriculture Research (GCSAR), Damascus, Syria