Reductive degradation of perfluorinated compounds in water using Mg-aminoclay coated nanoscale zero valent iron

Hwang, Yuhoon; Andersen, Henrik Rasmus; Stasinakis, Athanasios S.; Thomaidis, Nikolaos S.; Aloupi, Maria

doi:10.1016/j.cej.2014.09.079

Cited by 113 publications

(19 citation statements)

References 38 publications

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“…These polymeric fluids allow particles to be injected in the subsurface to adsorb contaminants and degrade them. Examples of particles used for this purpose include nano‐scale zero‐valent iron (nZVI), polymeric nanoparticles, nano‐scale peroxide and metal particles, carbon nano‐tubes, and slurried particles of activated carbon, sold by Regenesis under the tradename of Plume Stop Liquid Activated Carbon. Polymeric fluids are often used to disperse the particles and prevent their aggregation.…”

Section: Introductionmentioning

confidence: 99%

Shear rheological properties of composite fluids and stability of particle suspensions: Potential implications for fracturing and environmental fluids

et al. 2019

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Composite fluids are comprised of particles and polymers and are used for fracking and the in‐situ treatment of subsurface contaminants. This study investigates the correlation between the shear viscoelasticity of guar aqueous solutions and their effectiveness in suspending sand, which is a common fracking proppant. In the absence of a crosslinker, the shear viscous modulus (G”) of 5 g/L guar solutions was greater than the shear elastic modulus (G’). When the crosslinker borax was added, the guar solutions behaved as yield stress fluids (G’ > G”). Sand was well‐suspended in the crosslinked guar solutions but settled in non‐crosslinked fluids. Similar results were obtained with fenugreek gum. This study also investigates the correlation between particle settling and the effect of particle addition on the rheology of the fluids. Granulated activated carbon (GAC) particles are utilized to remediate polluted sites and were used as model particles. Guar and xanthan effectively suspended the GAC. Anionic polyacrylamide effectively suspended the GAC but not after soaking in sodium dodecyl sulphate. Zetag 8167 did not effectively suspend the GAC. The addition of 10 g/L of GAC did not affect the shear rheology of the fluids that suspended them, but decreased the shear viscoelastic moduli of the polymeric fluids that could not suspend them.

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Section: Introductionmentioning

confidence: 99%

Shear rheological properties of composite fluids and stability of particle suspensions: Potential implications for fracturing and environmental fluids

et al. 2019

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“…However, for the purposes of industrial application, these materials need to be up-scaled to pilot-scale reactors. There are a variety of pilot reactors that have been introduced in the literature 26,27 . In this study, we used a design of pilot reactor that has been introduced in previous reports 28,29 .…”

Section: Resultsmentioning

confidence: 99%

“…Besides being utilized as a single agent, MgAC has been conjugated with other materials for environmental-treatment purposes. For example, MgAC has been coated with nZVI for removal of perfluorinated compounds 26 and chromium 27 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of MgAC-Fe3O4/TiO2 hybrid nanocomposites via sol-gel chemistry for water treatment by photo-Fenton and photocatalytic reactions

Bui

Park

Pham

et al. 2019

Sci Rep

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MgAC-Fe 3 O 4 /TiO 2 hybrid nanocomposites were synthesized in different ratios of MgAC-Fe 3 O 4 and TiO 2 precursor. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray fluorescence spectrometry (XRF), electron spin resonance spectrometry (ESR), Brunauer-Emmett-Teller (BET), photoluminescence (PL), and UV photoelectron spectroscopy (UPS) were used to characterize the nanocomposites. The increase of MgAC-Fe 3 O 4 , in the hybrid nanocomposites’ core-shell structure, led to the decrease of anatase TiO 2 peaks, thus reducing the photo-Fenton and photocatalytic activities. According to the obtained data, MgAC-Fe 3 O 4 [0.05 g]/TiO 2 showed the best photo-Fenton and photocatalytic activities, having removed ~93% of MB (photo-Fenton reaction) and ~80% of phenol (photocatalytic reaction) after 20 and 80 mins, respectively. On the pilot scale (30 L), MgAC-Fe 3 O 4 [0.05 g]/TiO 2 was completely removed after 27 and 30 hours by the photo-Fenton and photocatalytic activities, respectively. The synergistic effect gained from the combined photo-Fenton and photocatalytic activities of Fe 3 O 4 and TiO 2 , respectively, was credited for the performances of the MgAC-Fe 3 O 4 /TiO 2 hybrid nanocomposites.

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“…The increased size of these cluster result in a sharp decrease in surface area and poor dispersion of nZVI in aqueous solution [13,14]. Thus, to overcome the aggregation of nZVI, researchers have attempted different stabilization methods for its effective environmental application [12,19,20]. Some supporting materials (e.g., clay, zeolite and biochar) and surface stabilizers (e.g., surfactant, synthetic or natural macromolecule or polyelectrolyte) were chosen to stabilize nZVI [12].…”

Section: Introductionmentioning

confidence: 99%

Ca(OH)2 coated nanoscale zero-valent iron as a persulfate activator for the degradation of sulfamethazine in aqueous solution

Deng

Dong

et al. 2019

Separation and Purification Technology

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In this work, a novel composite, Ca(OH) 2 coated nanoscale zero-valent iron (denoted as nZVI-Ca(OH) 2), was synthesized and used as an activator of persulfate for the degradation of sulfamethazine (SMT). The effects of sonication time during composite synthesis, pH, nZVI-Ca(OH) 2 dosage and typical groundwater components were investigated by batch experiments. Sonication time during the synthesis of the composite could affect the thickness of Ca(OH) 2 shell, however, it exerted no obvious effect on SMT removal by nZVI-Ca(OH) 2 activated persulfate. The initial pH also had insignificant effect on SMT removal in nZVI-Ca(OH) 2 /persulfate system. There was an optimum dosage of nZVI-Ca(OH) 2 composites for the activation of persulfate, and the SMT removal efficiency decreased at both higher and lower dosage. The efficient performance of nZVI-Ca(OH) 2 in synthetic groundwater was observed over a wide pH range (3-9). However, with the presence of high concentration of HCO 3or SO 4 2-, SMT removal was inhibited greatly due to the quenching of radicals by HCO 3or SO 4 2and the buffering effect of HCO 3-. In addition, the longevity of nZVI-Ca(OH) 2 was also investigated. Even after 30 days of aging in the air, Fe 0 could still be detected in nZVI-Ca(OH) 2. Despite some loss of Fe 0 , the composites kept high reactivity for activation of persulfate for SMT removal, which might be attributed to the excellent activation ability of amorphous iron oxides. To sum up, the Ca(OH) 2shell can protect the inner iron core and consequently prolong the lifetime of nZVI.

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Reductive degradation of perfluorinated compounds in water using Mg-aminoclay coated nanoscale zero valent iron

Cited by 113 publications

References 38 publications

Shear rheological properties of composite fluids and stability of particle suspensions: Potential implications for fracturing and environmental fluids

Shear rheological properties of composite fluids and stability of particle suspensions: Potential implications for fracturing and environmental fluids

Synthesis of MgAC-Fe3O4/TiO2 hybrid nanocomposites via sol-gel chemistry for water treatment by photo-Fenton and photocatalytic reactions

Ca(OH)2 coated nanoscale zero-valent iron as a persulfate activator for the degradation of sulfamethazine in aqueous solution

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