Removal of methyl orange from aqueous solution using bentonite-supported nanoscale zero-valent iron

Chen, Zhengxian; Jin, Xiaoying; Chen, Zuliang; Megharaj, Mallavarapu; Naidu, Ravi

doi:10.1016/j.jcis.2011.07.057

Cited by 372 publications

(130 citation statements)

References 25 publications

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“…On the basis of IR bands, the positions of the vibrations at 1627 and 3617 cm -1 (Figure 3a) (the stretching vibrations of the hydroxyl group) are very sensitive to the stabilization of nZVI and these bands are shifted to 1634 and 3635 cm -1 (Figure 3b), respectively. These results are similar to those obtained by other authors (Li et al 2010(Li et al , 2011aChen et al 2011).…”

Section: Methodssupporting

confidence: 93%

Nitrate removal from aqueous solution using natural zeolite-supported zero-valent iron nanoparticles

2014

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Sepehri S., Heidarpour M., Abedi-Koupai J. (2014): Nitrate removal from aqueous solution using natural zeolite-supported zero-valent iron nanoparticles. Soil & Water Res., 9: 224-232.A report on the synthesis and characterization of nanoscale zero-valent iron in the presence of natural zeolite as a stabilizer is presented. This novel adsorbent (Ze-nZVI) was synthesized by the sodium borohydride reduction method. The scanning electron microscopy (SEM) images revealed that the stabilized nZVI particles were uniformly dispersed across the zeolite surface without obvious aggregation. The synthesized Ze-nZVI material was then tested for the removal of nitrate from aqueous solution. The effect of various parameters on the removal process, such as initial concentration of nitrate, contact time, initial pH, and Ze-nZVI dosage, was studied. Batch experiments revealed that the supported nZVI materials generally have great flexibility and high activity for nitrate removal from aqueous solution. The nitrogen mass balance calculation showed that ammonium was the major product of nitrate reduction by Ze-nZVI (more than 84% of the nitrate reduced); subsequently the natural zeolite in Ze-nZVI removed it completely via adsorption. The kinetic experiments indicated that the removal of nitrate followed the pseudo-second-order kinetic model. The removal efficiency for nitrate decreased continuously with an increase in the initial solution pH value and Ze-nZVI dosage but increased with the increase in the initial concentration of nitrate. The overall results indicated the potential efficacy of Ze-nZVI for environmental remediation application.

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Section: Methodssupporting

confidence: 93%

Nitrate removal from aqueous solution using natural zeolite-supported zero-valent iron nanoparticles

2014

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“…These results were also confirmed by studies that have showed that modified zero valent iron showed a greater performance in the removal of various pollutants than non-modified ZVI [39,43]. In more recent studies, Diao and co-workers [44] reported the efficiency of bentonite-supported nanoscale zero-valent iron as a catalyst able to activate persulfate, and produce SR, which was confirmed from a positive correlation between persulfate decomposition and dissolved Fe(II).…”

Section: Ferrous Activation Systemssupporting

confidence: 62%

Sulfate Radical Technologies as Tertiary Treatment for the Removal of Emerging Contaminants from Wastewater

2017

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Abstract:Water scarcity and water pollution is a worldwide problem and has driven research into eco-friendly and low-energy cost efficient remediation. The reuse of wastewater for non-potable purpose after proper treatment is the only sustainable solution to the problem. Advanced oxidation processes (AOP) based on the in-situ generation of hydroxyl radicals have been intensively investigated for this purpose as a treatment step to achieve wastewater reuse. The main degradation mechanism of AOPs is based on the reaction of hydroxyl radicals with dissolved organic matter. However, hydroxyl radicals follow unselective multi-step pathways, limiting their efficiency in complex environmental matrices. To overcome such limitations, AOP treatment, based on generation of sulfate radicals, has been developed and widely investigated. This current mini-review will cover the most recent developments regarding emerging contaminant removal, i.e., organic micropollutants, using sulfate radicals generated by active persulfate or peroxymonosulfate, with a focus on an application to wastewater effluents for possible wastewater reuse.

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“…Few clay minerals such as zeolites, bentonites, kaolinite, and montmorillonite have also been used/ employed successfully as support for nZVI [23,35,85,92]. The ion exchange property of these natural clay minerals facilitates incorporation of iron in their porous structure.…”

Section: Supporting Materialsmentioning

confidence: 99%

Stabilization of Zero-Valent Iron Nanoparticles: Role of Polymers and Surfactants

Singh¹,

Misra²

2015

Handbook of Nanoparticles

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In recent years, nanotechnology has emerged as a novel tool for application in various fields of electronics, photonics, magnetic, biomedicine, optics, etc. The ability of nanoparticles to serve as a versatile application tool could be attributed to their unique physicochemical characteristics that significantly differ from their bulk counterparts. Nevertheless, their tendency toward aggregation results in reduced reactivity and longevity which in turn exerts negative impact on their application potential. To overcome this constraint, several surface modifications and particle stabilization methods have been developed using various kind additives such as surfactants, polymers, water-soluble starch, carboxymethyl cellulose, cellulose acetate, polyacrylic acid, etc. These additives effectively control the shape and size of nanoparticles, enhance nanoparticles' stability and mobility, and thereby increase the nanoparticle efficiency. The present chapter provides a brief overview of recent developments in stabilization methods, modification approaches, additives used for stabilization of nanoparticles with special reference to polymers and surfactants, and their mechanism of action. The significance of different additives in relation to nanoparticle efficiency in degrading/reducing environmental contaminants will also be addressed.

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Removal of methyl orange from aqueous solution using bentonite-supported nanoscale zero-valent iron

Cited by 372 publications

References 25 publications

Nitrate removal from aqueous solution using natural zeolite-supported zero-valent iron nanoparticles

Nitrate removal from aqueous solution using natural zeolite-supported zero-valent iron nanoparticles

Sulfate Radical Technologies as Tertiary Treatment for the Removal of Emerging Contaminants from Wastewater

Stabilization of Zero-Valent Iron Nanoparticles: Role of Polymers and Surfactants

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