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:: Volume 8, Issue 1 (Winter 2021) ::
Environ. health eng. manag. 2021, 8(1): 15-24 Back to browse issues page
Optimizing the removal of methylene blue from aqueous solutions using persulfate activated with nanoscale zero valent iron (nZVI) supported by reduced expanded graphene oxide (rEGO)
Alaa Mohamad Soubh , Mohammad Ali Abdoli , Lorin Ali Ahmad
Corresponding author: School of Environment, College of Engineering, University of Tehran, Tehran, Iran , soubh@ut.ac.it
Abstract:   (717 Views)
Background: 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.
Methods: 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.
Results: 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%.
Conclusion: According to the results, nZVI@rEGO is considered as a promising activator of persulfate.
Keywords: Persulfate, Methylene blue, Graphite, Graphene oxide, Kinetics
eprint link: http://eprints.kmu.ac.ir/id/eprint/35525
Full-Text [PDF 1048 kb]   (399 Downloads)    
Type of Study: Original Article | Subject: General
Received: 2021/02/3 | Accepted: 2021/01/29 | Published: 2021/03/15
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Soubh A M, Abdoli M A, Ahmad L A. Optimizing the removal of methylene blue from aqueous solutions using persulfate activated with nanoscale zero valent iron (nZVI) supported by reduced expanded graphene oxide (rEGO). Environ. health eng. manag.. 2021; 8 (1) :15-24
URL: http://ehemj.com/article-1-699-en.html


Volume 8, Issue 1 (Winter 2021) Back to browse issues page
مجله مدیریت و مهندسی بهداشت محیط Environmental Health Engineering And Management Journal
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