Electrochemical regeneration of a reduced graphene oxide/magnetite composite adsorbent loaded with methylene blue

Sharif, Farbod; Gagnon, Luke; Mulmi, Suresh; Roberts, Edward P.L.

doi:10.1016/j.watres.2017.02.042

Cited by 90 publications

(32 citation statements)

References 56 publications

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“…Electrochemical regeneration: an electrolytic cell was used to regenerate the spent adsorbents using a graphite plate as the anode and a stainless-steel plate as the cathode, as described in an earlier study [14]. Sodium chloride and sodium sulfate (VWR, Radnor, PA, USA) were used as electrolytes.…”

Section: Methodsmentioning

confidence: 99%

“…This material demonstrated high regeneration efficiency but low adsorptive capacity. In the previous study [14], reduced graphene oxide (rGO)/magnetite was chosen as an adsorbent since it has a nonporous surface, high surface area, and high electrical conductivity. The findings revealed that rGO/magnetite has satisfactory adsorptive capacity which can be completely regenerated.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Oxidation of an Organic Dye Adsorbed on Tin Oxide and Antimony Doped Tin Oxide Graphene Composites

Sharif

Roberts

2020

Catalysts

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Electrochemical regeneration suffers from low regeneration efficiency due to side reactions like oxygen evolution, as well as oxidation of the adsorbent. In this study, electrically conducting nanocomposites, including graphene/SnO2 (G/SnO2) and graphene/Sb-SnO2 (G/Sb-SnO2) were successfully synthesized and characterized using nitrogen adsorption, scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. Thereafter, the adsorption and electrochemical regeneration performance of the nanocomposites were tested using methylene blue as a model contaminant. Compared to bare graphene, the adsorption capacity of the new composites was ≥40% higher, with similar isotherm behavior. The adsorption capacity of G/SnO2 and G/Sb-SnO2 were effectively regenerated in both NaCl and Na2SO4 electrolytes, requiring as little charge as 21 C mg−1 of adsorbate for complete regeneration, compared to >35 C mg−1 for bare graphene. Consecutive loading and anodic electrochemical regeneration cycles of the nanocomposites were carried out in both NaCl and Na2SO4 electrolytes without loss of the nanocomposite, attaining high regeneration efficiencies (ca. 100%).

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical Oxidation of an Organic Dye Adsorbed on Tin Oxide and Antimony Doped Tin Oxide Graphene Composites

Sharif

Roberts

2020

Catalysts

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“…Alternatively, nanoengineered carbon-based adsorbents like fullerenes and carbon nanotubes have gained attention owing to their much larger surface area that may enhance the adsorption capacity (Yang and Xing, 2010). Graphene and its derivatives are also very promising owing to their larger surface area and high electrical conductivity (Wang et al, 2012;Sharif et al, 2017) and, among them, graphene nanosheets (GNS) are being developed as next-generation adsorbents due to their high adsorption capacity along with their affinity toward organic contaminants (Ersan et al, 2017). Previous studies about tyrosol adsorption on carbonaceous substrates have focused on conventional activated carbon materials such as active charcoal (Richard et al, 2010).…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

“…Regeneration of GNPs loaded with tyrosol was performed electrochemically. The process used has previously been reported for regeneration of various type of adsorbents, including GIC (Ashgar et al, 2012), and graphene-magnetite composites (Sharif et al, 2017). In this work, applying a constant current (5 mA cm −2 ) to a bed of tyrosol-loaded GNPs was used to regenerate the adsorbent and destroy the contaminant via electro-oxidation.…”

Section: Electrochemical Regenerationmentioning

confidence: 99%

Removal of tyrosol from water by adsorption on carbonaceous materials and electrochemical advanced oxidation processes

et al. 2018

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This work compares the ability of physical and chemical treatments, namely adsorption and electrochemical advanced oxidation processes, to remove tyrosol from aqueous medium. Adsorption on graphene nanoplatelets (GNPs) performed much better than that with a graphite intercalation compound. Adsorption isotherms were found to follow the Freundlich model (R = 0.96), which is characteristic of a chemisorption process. Successful electrochemical regeneration enables 5 successive adsorption/regeneration cycles before corrosion of GNPs occurs. Other typical aromatic contaminants that may coexist with tyrosol can be also adsorbed on GNPs. Percentage of regeneration efficiency of GNPs showed a higher affinity towards Lewis acids group compounds and a lower one towards Lewis base. The treatment of 100 mL of 0.723 mM tyrosol solutions in non-chlorinated and chlorinated matrices at pH 3.0 was carried out by electrochemical oxidation with electrogenerated HO (EO-HO), electro-Fenton (EF) and UVA photoelectro-Fenton (PEF). Trials were made with a BDD anode and an air-diffusion cathode at 10-30 mA cm. Hydroxyl radicals formed at the anode from water oxidation and/or in the bulk from Fenton's reaction between added Fe and generated HO, along with active chlorine produced in chlorinated medium, were the main oxidants. Tyrosol concentration always decayed following a pseudo-first-order kinetics and its mineralization rose as EO-HO < EF < PEF, more rapidly in the chlorinated matrix. The potent photolysis of intermediates under UVA radiation explained the almost total mineralization achieved by PEF in the latter medium. The effect of current density and tyrosol content on the performance of all processes was examined.

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“…Graphene has attracted great interest in research elds, due to its excellent electrical properties and high specic surface area. 1,2 However, nely-sized graphene causes environmental pollution and suffers from poor integral mechanical properties while aggregated graphene monoliths lose the large surface area. 3,4 Thus, it is necessary to integrate graphene sheets into 3D porous structures.…”

Section: Introductionmentioning

confidence: 99%

The preparation of a three dimensional terbium doped reduced graphene oxide aerogel with photoluminescence and paramagnetic properties

et al. 2018

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Electrochemical regeneration of a reduced graphene oxide/magnetite composite adsorbent loaded with methylene blue

Cited by 90 publications

References 56 publications

Electrochemical Oxidation of an Organic Dye Adsorbed on Tin Oxide and Antimony Doped Tin Oxide Graphene Composites

Electrochemical Oxidation of an Organic Dye Adsorbed on Tin Oxide and Antimony Doped Tin Oxide Graphene Composites

Removal of tyrosol from water by adsorption on carbonaceous materials and electrochemical advanced oxidation processes

The preparation of a three dimensional terbium doped reduced graphene oxide aerogel with photoluminescence and paramagnetic properties

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