Oxidation of ferrous ions by hydroxyl radicals

Jayson, G. G.; Parsons, Barry J.; Swallow, A. J.

doi:10.1039/f19726802053

Cited by 40 publications

(24 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…(13) and (14)) (Yan et al, 2013), indicated by the peaks for hydroxyl radical (~250 nm) in the UVeVis spectrum of S-nZVI with Cd under oxic conditions (Jayson et al, 1972) (Fig. S9).…”

Section: Enhanced CD Removal Performance Of S-nzvi Under Aerobic Condmentioning

confidence: 99%

Magnetic sulfide-modified nanoscale zerovalent iron (S-nZVI) for dissolved metal ion removal

et al. 2015

View full text Add to dashboard Cite

Keywords:Nanoscale zerovalent iron Sulfide-modified nanoscale zerovalent iron Heavy metal removalOxygen effect pH effect a b s t r a c t Sulfide-modified nanoscale zerovalent iron (S-nZVI) is attracting a lot of attention due to its ease of production and high reactivity with organic pollutants. However, its structure is still poorly understood and its potential application in heavy metal remediation has not been explored. Herein, the structure of S-nZVI and its cadmium (Cd) removal performance under different aqueous conditions were carefully investigated. Transmission electron microscopy (TEM) with an energy-dispersive X-ray spectroscopy (EDS) analysis suggested that sulfur was incorporated into the zerovalent iron core. Scanning electron microscopy (SEM) with EDS analysis demonstrated that sulfur was also homogeneously distributed within the nanoparticles. When the concentration of Na 2 S 2 O 4 was increased during synthesis, a flake-like structure (FeS x ) increased significantly. S-nZVI had an optimal Cd removal capacity of 85 mg/g, which was >100% higher than for pristine nZVI. Even at pH 5, over 95% removal efficiency was observed, indicating sulfide compounds played a crucial role in metal ion removal and particle chemical stability. Oxygen impaired the structure of S-nZVI but enhanced Cd removal capacity to about 120 mg/g. Particle aging had no negative effect on removal capacity of S-nZVI, and Cd-containing mixtures remained stable in a two months experiment. S-nZVI can efficiently sequester dissolved metal ions from different contaminated water matrices.© 2015 Elsevier Ltd. All rights reserved. Available online at www.sciencedirect.com ScienceDirect j ou rnal h ome pag e: www.elsevier.com/loca te/watres w a t e r r e s e a r c h 7 4 ( 2 0 1 5 ) 4 7 e5 7http://dx

show abstract

“…(13) and (14)) (Yan et al, 2013), indicated by the peaks for hydroxyl radical (~250 nm) in the UVeVis spectrum of S-nZVI with Cd under oxic conditions (Jayson et al, 1972) (Fig. S9).…”

Section: Enhanced CD Removal Performance Of S-nzvi Under Aerobic Condmentioning

confidence: 99%

Magnetic sulfide-modified nanoscale zerovalent iron (S-nZVI) for dissolved metal ion removal

et al. 2015

View full text Add to dashboard Cite

show abstract

“…By tracking spectrum changes up to 2 µs a rapid absorbance increase may be observed at the wavelength λ = 340÷350 nm. As is known from the literature, chloride ion-radicals absorb light in the wavelength range λ = 250 to 400 nm, while at λ = 340 nm the spectrum has its maximum [15]. Therefore, it can be concluded that the appearance of the peak at λ = 340 nm results from the formation of chloride ion-radicals.…”

Section: Effect Of Nacl On Fenton Processmentioning

confidence: 67%

“…Chloride ion-radicals can be followed spectrophotometrically in the wavelength range λ = 300 to 400 nm. The spectrum has a maximum absorbance at the wavelength λ = 340 nm [15]. In order to obtain the chloride ion-radicals, dye solutions were acidified with HCl, the HCl concentration in the solution was 0.1M.…”

Section: Pulse Radiolysismentioning

confidence: 99%

Application of Fenton's Reagent in the Textile Wastewater Treatment Under Industrial Conditions

Ledakowicz¹,

Bilińska²,

Żyłła³

2012

Ecological Chemistry and Engineering S

View full text Add to dashboard Cite

Application of reactive dyes is very popular in textile industry as these dyestuffs are characterized by good fastness properties. Constapel et al in 2009 estimated the production of this type of dyes for over 140,000 Mg/year. The reactive dyes are mostly (50%) employed for coloration of cellulosic fibers, however they can also be applied on wool and nylon. Unfortunately, they possess a low degree of fixation (50÷90%), since the functional groups also bond to water, creating hydrolysis and the excess of dyes applied cause a colored pollution of aqueous environment. Moreover, dyeing process requires the use of: electrolytes in the form of aqueous solutions of NaCl or Na2SO4 in the concentration up to 100 g/dm 3 , alkaline environment (pH > 10) and textile auxiliary agents (including detergents). Therefore, the wastewater generated during the reactive dyeing processes is characterized by high salinity, pH value and color, and due to low value of the BOD5/COD ratio are nonbiodegradable. The successful methods of textile wastewater treatment could be Advanced Oxidation Processes (AOPs), amongst which the Fenton reagent seems to be most promising as it is the cheapest and easy in use. Based on the newest literature survey it was found that many successful tests with Fenton reaction were performed mainly in decolorization. However, not enough attention was devoted to decolorization of real industrial wastewater containing dyes, detergents and salts NaCl, or Na2SO4. The experiments carried out in a laboratory scale were focused on the impact of NaCl and textile auxiliary agent (liquid dispersing and sequestering agent) on an inhibition of decolorization process by Fenton's reagent. The objects of the investigation were synthetic mixtures simulating the composition of real textile wastewater as well as the real industrial wastewater generated in the reactive dyeing. The inhibition of the Fenton decolorization in the presence of NaCl and liquid dispersing and sequestering agent was demonstrated. Additional experiments using pulse radiolysis were carried out in order to confirm the inhibition of chloride in the decolorization process.

show abstract

“…Fe 2+ may be effectively oxidized by photochemically produced reactive oxygen species (ROS) (Jayson et al, 1972;Miller et al, 1995;Voelker et al, 1997;Emmenegger et al, 1998). Nitrate (NO À 3 ) may be a significant source of hydroxyl radicals through photolytic processes in natural waters (Zafiriou and True, 1979;Mack and Bolton, 1999).…”

Section: Discussionmentioning

confidence: 99%

Abiotic effects of UV on planktonic P kinetics

2009

View full text Add to dashboard Cite

We examined the effect of ultraviolet radiation (UVR) on phosphorus availability in the surface waters of three thermally stratified Canadian shield lakes: Muskoka, Brandy, and Plastic. Study lakes were selected to encompass a range of chemical parameters (DOC, TP, pH, Fe, and NO À 3 ) that have been shown to influence aquatic photochemistry. Differences in spectral absorbance of DOM (280 -700 nm) occurred after UVR treatment in all lakes. UVR exposed lake filtrate from Lake Muskoka had an increase in spectral absorbance throughout the UV spectrum (280 -399 nm), but a decrease throughout the PAR spectrum (400 -700 nm). UVR exposed lake filtrate from Brandy and Plastic Lakes had decreased spectral absorbance at all wavelengths (280 -700 nm). Photochemical changes of UVR exposed lake filtrate (<0.2 mm) resulted in a more rapid turnover of the PO 3À 4 pool when reintroduced to whole lake water (Muskoka). Lake filtrate from Brandy and Plastic Lake did not respond to treatment.

show abstract

Oxidation of ferrous ions by hydroxyl radicals

Cited by 40 publications

References 0 publications

Magnetic sulfide-modified nanoscale zerovalent iron (S-nZVI) for dissolved metal ion removal

Magnetic sulfide-modified nanoscale zerovalent iron (S-nZVI) for dissolved metal ion removal

Application of Fenton's Reagent in the Textile Wastewater Treatment Under Industrial Conditions

Abiotic effects of UV on planktonic P kinetics

Contact Info

Product

Resources

About