Advanced oxidation of orange G using phosphonic acid stabilised zerovalent iron

Ike, Ikechukwu A.; Foster, Shelby L.; Shinn, Sheldon; Watson, Skylar; Orbell, John D.; Greenlee, Lauren F.; Duke, Mikel

doi:10.1016/j.jece.2017.07.069

Cited by 21 publications

(11 citation statements)

References 34 publications

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“…The diameter of all four types of nanoparticles is ∼100 nm according to electron microscopy image analysis, and this result agrees well with the data obtained from DLS. As shown in our previous publications, XRD patterns of CMC, ATMP, and DTPMP functionalized nanoparticles indicate the presence of the same crystal phases irrespective of the ligand. , In addition, the functionalized nanoparticles show broader XRD peaks compared to unfunctionalized samples. This result indicates the presence of small crystallites within the particles and/or amorphous particles. , The most intense XRD peak was identified at 2θ = 45° for both CMC and phosphate ligands and corresponds to Fe (110) of metallic iron. ,− Other low-intensity peaks correspond to the oxides of iron, Fe 3 O 4 (magnetite), and γ-Fe 2 O 3 (maghemite) of the native oxide shell. , Phosphonate stabilization resulted in unique phosphate phases thought to be at the surface of the ZVI nanoparticles; this result suggests that phosphonate ligands are directly involved in ZVI passivation.…”

Section: Resultssupporting

confidence: 63%

“…Field emission scanning electron microscopy (FESEM) with EDX and TEM was used to characterize the size, shape, and elemental composition of the different ZVI nanoparticles. Extensive characterization information about CMC and ATMP functionalized nanoparticles is given in our previous publications. , As seen with FESEM images in Figure , as-synthesized nanoparticles functionalized with all four ligands are spherical in shape. The diameter of all four types of nanoparticles is ∼100 nm according to electron microscopy image analysis, and this result agrees well with the data obtained from DLS.…”

Section: Resultsmentioning

confidence: 91%

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Influence of Ligand Size and Chelation Strength on Zerovalent Iron Nanoparticle Adsorption and Oxidation Behavior in the Presence of Water Vapor and Liquid Water

2019

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The effectiveness of zerovalent iron (ZVI) nanoparticles in applications from water remediation to catalysis is intimately tied to adsorption and oxidation processes at the nanoparticle surface. Understanding water sorption and ZVI oxidation as a function of surface-sorbed organic ligand properties can provide new fundamental insights into tuning the reactivity of the nanoparticles. In this work, ZVI nanoparticles were synthesized in the presence of four different organic ligand molecules: two carboxymethyl cellulose polymers of different molecular weights and two phosphonate chelators with different known iron chelation strengths. The resulting ZVI nanoparticles were similar in size (∼100 nm), and adsorption and oxidation behavior are compared on the basis of the properties of the ligand sorbed to the surface of the ZVI nanoparticles. Adsorption and oxidation processes are studied via quartz crystal microbalance (QCM) measurements, where the change in nanoparticle mass is followed over time as the nanoparticles were exposed to varying levels of relative humidity in air or oxygenated water. A clear dependence was shown between measured change in mass and either chelation strength or polymer molecular weight. An increase in either the ligand size or the chelation strength reduced oxidation in oxygenated water. Ligand size resulted in an increase in water vapor adsorption. Reversible mass changes were observed for RH values ≤50% and as a function of ligand, suggesting water sorption, while irreversible mass changes were observed for RH values ≥50% and suggest ZVI oxidation. QCM results were further corroborated with dynamic light scattering, zeta-potential measurements, and scanning electron microscopy. Our results suggest that water adsorption on and oxidation of ZVI nanoparticles may be engineered to a suitable degree through a more thorough understanding of ligand–ZVI interactions.

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Section: Resultssupporting

confidence: 63%

Section: Resultsmentioning

confidence: 91%

Influence of Ligand Size and Chelation Strength on Zerovalent Iron Nanoparticle Adsorption and Oxidation Behavior in the Presence of Water Vapor and Liquid Water

2019

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“…High-performance liquid chromatography (HPLC) analyses on collected degradation samples were conducted using a Shimadzu Prominence-i LC 2030C liquid chromatograph with UV detector at 280 nm. Details of the chromatographic procedure may be found in a previous publication . The pH of solutions was measured using a Hanna H1 2211 pH/ORP meter.…”

Section: Methodsmentioning

confidence: 99%

“…Details of the chromatographic procedure may be found in a previous publication. 22 The pH of solutions was measured using a Hanna H1 2211 pH/ORP meter. Where applicable, average values of duplicate experiments are reported with error bars indicating standard errors of measurements.…”

Section: •−mentioning

confidence: 99%

Activation of Persulfate at Waste Heat Temperatures for Humic Acid Degradation

Ike

Orbell

Duke

2018

ACS Sustainable Chem. Eng.

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Humic acid (HA) as a major constituent of natural organic matter (NOM) in raw water presents major challenges to drinking water production including membrane fouling and serving as a precursor for the production of disinfection byproducts (DBPs). This study demonstrates the feasibility of HA degradation by heat-activated persulfate (PS) mainly at a waste heat temperature of 40 °C, but also at 60 and 90 °C in which ∼70% TOC loss was achieved within 168, 24, and 1 h, respectively. The use of waste heat for water treatment eliminates reliance on electricity, which is a requirement for conventional advanced oxidation processes. Heat-activated PS treatment of synthetic raw water at 40 °C was also shown to significantly reduce ultrafiltration membrane fouling. Low concentration of chloride (≤0.9 mM) accelerated PS degradation of HA, but the promotion was lost at higher concentration (≥9 mM). HA spiked into tap water was degraded by PS even at 25 °C, suggesting activation by trace minerals present within regulatory limits. Overall, the results of this study promise a sustainable and low-cost water treatment option.

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“…Both reactive degradation and adsorption are expected to occur during Orange G removal and are likely interconnected in terms of the overall removal mechanism (i.e., Orange G degradation largely occurs at the surface of the nanoparticles during or after Orange G adsorption). Additional factors that could contribute to variation in Orange G removal efficiency include differences in nanoparticle size [59] and the impact of the stabilizer ligands [60], which are parameters that were not specifically studied in this work. While these parameters may also impact Orange G removal, it is clear that the molar ratio of Ni to Fe in the nanoparticles is an important parameter to control and understand when evaluating the removal efficiency of a target contaminant such as Orange G.…”

Section: Orange G Removal From Synthetic Watermentioning

confidence: 99%

Nickel-Iron Alloy Nanoparticle Characteristics Pre- and Post-Reaction With Orange G

Foster

Acharya

Abolhassani

et al. 2021

IEEE Open J. Nanotechnol.

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Bimetallic nanoparticles comprised of iron and nickel were synthesized, characterized, and evaluated to optimize the ideal metal ratio for azo dye removal from water systems. Results show that changing the molar ratio of nickel to iron caused different removal rates, as well as the extent of overall elimination of azo dye from water. Lower molar ratios, from Ni1Fe10 to Ni2.5Fe10, exhibited a higher removal efficiency of 80-99%. Higher concentrations of Ni in the catalyst, from Ni3Fe10 to Ni5Fe10, resulted in 70-90% removal. The lower molar ratios of Ni exhibited a consistent removal rate of 0.11 g/L/min, while the higher molar ratios of Ni displayed varying removal rates of 0.1-0.05 g/L/min. A second order kinetic model was fit to the first twenty minutes of the reaction for all nickel to iron compositions, where there is a decrease in rate constant with an increase in molar ratio. During the last forty minutes of reaction, azo dye removal fit a zero order kinetic model. All as-synthesized nanoparticle samples were found to be structurally disordered based on the lack of distinct peaks in XRD spectra. Post-reaction samples were found to have Fe2O3 and FeOOH cubic peaks.

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Advanced oxidation of orange G using phosphonic acid stabilised zerovalent iron

Cited by 21 publications

References 34 publications

Influence of Ligand Size and Chelation Strength on Zerovalent Iron Nanoparticle Adsorption and Oxidation Behavior in the Presence of Water Vapor and Liquid Water

Influence of Ligand Size and Chelation Strength on Zerovalent Iron Nanoparticle Adsorption and Oxidation Behavior in the Presence of Water Vapor and Liquid Water

Activation of Persulfate at Waste Heat Temperatures for Humic Acid Degradation

Nickel-Iron Alloy Nanoparticle Characteristics Pre- and Post-Reaction With Orange G

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