Template-free synthesis of flower-shaped zero-valent iron nanoparticle: Role of hydroxyl group in controlling morphology and nitrate reduction

Ghosh, Ananya; Dutta, Subhajit; Mukherjee, Indrani; Biswas, Sourav; Chatterjee, Sriparna; Saha, Rajnarayan

doi:10.1016/j.apt.2017.06.006

Cited by 28 publications

(7 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Polyols are known to be effective in reducing metal ions 21 and ethylene glycol, which has two hydroxyl moieties in its structure and hence has been widely used for the synthesis of metal 22 and metal oxide 11 nanoparticles. In the present synthesis, ethylene glycol along with polyvinyl polypyrrolidone (PVP) was used to synthesize Cu/Cu 2 O using a high pressure reaction.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Alteration of Wettability of Copper–Copper Oxide Nanocomposites through Cu–O Bond Breaking Swayed by Ultraviolet and Electron Irradiation

Das

Giri²,

Manju

et al. 2021

Langmuir

Self Cite

View full text Add to dashboard Cite

Converting a nonwetting surface to a highly wetting one, aided by ultraviolet radiation, is well explored. Here, in this work, we show just the reverse behavior of a copper–copper oxide nanocomposite surface where ultraviolet radiation turned the superhydrophilic surface to a superhydrophobic one. This observation is explained both experimentally and theoretically using first-principles density functional theory-based calculations considering the metal–oxygen (Cu–O) bond breaking and related change in surface chemistry. This observation has further been corroborated with electron irradiation on the same nanocomposite material. To the best of our knowledge, for the first time, we show that the radiation-induced breaking of the copper–oxygen bond makes the nanostructure surface energetically unfavorable for water adsorption.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Alteration of Wettability of Copper–Copper Oxide Nanocomposites through Cu–O Bond Breaking Swayed by Ultraviolet and Electron Irradiation

Das

Giri²,

Manju

et al. 2021

Langmuir

Self Cite

View full text Add to dashboard Cite

show abstract

“…A quantity of 20 mL of the barley leaf extract/powder was added to 200 mL of 1 mM FeCl 3 solution at room temperature. The resultant mixture was stirred using a homogenization stirrer at 10,000 rpm for 60 min [32,33]. During this process, the color of the mixture changed to a very dark brown as seen in Figure 2b, indicating the formation of magnetic nanoparticles.…”

Section: Synthesis Of Nanoparticlesmentioning

confidence: 99%

Novel Magnetic Nano Silica Synthesis Using Barley Husk Waste for Removing Petroleum from Polluted Water for Environmental Sustainability

2020

View full text Add to dashboard Cite

Water contamination by petroleum and its byproducts presents a major challenge worldwide. It is critical that sustainable treatment methods be employed for the removal of such contaminants from polluted water. For this investigation, magnetic nano silica (M-NS) was synthesized using agricultural waste from barley husk using a two-step process that is environmentally friendly and uses green chemistry synthesis. The barley husk waste was used as a precursor for the synthesis of nano-silica following a low energy and sustainable method of acid reflux and heat treatment. Nano-silica was then used for the synthesis of M-NS, with the addition of a magnetic solution of Fe3O4 nanoparticles. The magnetic nano-silica particles were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Zeta potential analysis (ZETA) and X-Ray Diffraction (XRD). Magnetic nano-silica particles were observed to have an average diameter of 162 nm and appeared to be hydrophobic, with a large surface area of ~120 m2/gm. Due to these characteristics, magnetic nano-silica was used as an adsorbent for the removal of petrol contaminants from water. The experimental procedure showed that only 0.6 gm. of M-NS was used on 40 mg/L concentration of petroleum and the experiments recorded a high uptake efficiency of 85%. The sorption was shown to be an effective process since a high amount of petroleum was removed. The study further demonstrates that as the amount of sorbent is increased, the sorption capacity also increases until an equilibrium is reached. The results of this study establish that synthesis of M-NS, using environmentally sustainable processes, has the required characteristics to serve as sorbent for petroleum and its byproducts from contaminated water, thus enhancing environmental sustainability.

show abstract

“…The ESEM image of nZVI before treatment (Figure 3(a)) shows that the nZVI particles were agglomerated in the form of balllike structures connected with each other. The agglomeration observed in nZVI particles could be because of the high magnetic potency of the nZVI particles (Sohrabi et al 2014;Ghosh et al 2017). The EDAX analysis of nZVI before treatment (Figure 4(a)) manifests the presence of O (25%) and Fe (75%) as primary elements, and Cl (0.05%) is observed as an impurity because of the use of FeCl 3 for the synthesis of the nZVI particles.…”

Section: Esem-edax Analysismentioning

confidence: 99%

“…It has been noted that Fe 3 O 4 has the highest conductivity of all iron oxides (Cornell & Schwertmann 2003), thus would not hinder the electron transfer from the nZVI core to nitrate ions (Liu & Wang 2019). The Fe 0 tends to further oxidize under aerobic conditions where dissolved oxygen (DO) and H þ (in the aqueous medium) act as the electron acceptors (Equation (10)) (Ghosh et al 2017). The primary products of iron oxidation are Fe 2 O 3 , Fe 3 O 4 , goethite (α-FeOOH), akaganéite (β-FeOOH), and lepidocrocite (γ-FeOOH) (Figure 1 Adsorption of nitrate followed by subsequent redox reaction is generally recognized as the principal mechanisms of the nitrate removal process by nZVI (Figure 1 The effectiveness of nZVI in nitrate removal decreases sharply when exposed to the atmosphere because of the rapid formation of an oxide layer in the presence of DO affecting the reactivity of nZVI.…”

Section: Introductionmentioning

confidence: 99%

Nitrate removal in potable groundwater by nano zerovalent iron under oxic conditions

Kodikara

Gunawardana

Jayaweera

et al. 2020

Water Practice and Technology

View full text Add to dashboard Cite

Groundwater pollution by nitrate contamination has become a significant issue in some areas of Sri Lanka, giving rise to health concerns and a dearth in good quality potable water. In this study, the effectiveness of nano zerovalent iron (nZVI) for the removal of nitrate in potable groundwater under oxic conditions was investigated to meet the drinking water quality standards stipulated by World Health Organization (WHO) and Sri Lanka Standards Institution (SLSI) (nitrate level <50 mg/L). Under oxic conditions, the nZVI was synthesized and batch experiments were conducted using an artificial nitrate (150 mg/L) contaminated water sample. Our results corroborated that with an optimum nZVI dose of 1 g/L and optimum contact time of 30 minutes, 80% nitrate removal could be achieved and the remaining nitrate level was ≈ 30 mg/L as nitrate (<50 mg/L), which was equivalent to ≈ 7 mg/L as nitrate–N (≈21% of the total–N). Ammonium ions were the main product of nitrate reduction by nZVI and at 30 minutes contact time, ≈ 20 mg/L of ammonium as ammonium–N was detected (≈ 59% of the total–N). Ammonia stripping took place under the basic solution pH (pH > 9.5). At 30 minutes of contact time, ≈7 mg/L of ammonia as ammonia–N was accounted for ammonia stripping, which is 20% of the total–N. Ammonia stripping resulted in a decrease in nitrogen-containing species in the aqueous phase. The spent nZVI particles were recovered (99.9%) from the treated water using an external magnetic field. In conclusion, nZVI particles synthesized under oxic conditions are viable to successfully treat the nitrate-contaminated groundwater under aerobic conditions to reduce the nitrate levels to meet the WHO/SLSI drinking water quality standards.

show abstract

Template-free synthesis of flower-shaped zero-valent iron nanoparticle: Role of hydroxyl group in controlling morphology and nitrate reduction

Cited by 28 publications

References 61 publications

Alteration of Wettability of Copper–Copper Oxide Nanocomposites through Cu–O Bond Breaking Swayed by Ultraviolet and Electron Irradiation

Alteration of Wettability of Copper–Copper Oxide Nanocomposites through Cu–O Bond Breaking Swayed by Ultraviolet and Electron Irradiation

Novel Magnetic Nano Silica Synthesis Using Barley Husk Waste for Removing Petroleum from Polluted Water for Environmental Sustainability

Nitrate removal in potable groundwater by nano zerovalent iron under oxic conditions

Contact Info

Product

Resources

About