scholarly journals Sulfidation of Zero-valent Iron Nanoparticles for Environmental Remediation

2021 ◽  
Author(s):  
◽  
Amanda Berger
Keyword(s):  
Environmental Remediation ◽  
Sodium Thiosulfate ◽  
Zero Valent Iron ◽  
Side Reactions ◽  
Cadmium Removal ◽  
Naturally Occurring ◽  
Nitrophenol Reduction ◽  
Resistance To Oxidation ◽  
Oxidation By Water ◽  
Zero Valent Iron Nanoparticles

<p>The ability of nano-sized zero-valent iron (nZVI) to remove environmental contaminants, from heavy metals to polyhalogenated hydrocarbons, has been well established. However, the reactivity of nZVI towards contaminants is hampered due to competing for side reactions with oxygen and water. Sulfidemodified nZVI (S-nZVI) has become a viable option as S-nZVI has been shown to reduce organic compounds such as trichloroethylene faster than nZVI while also maintaining an increased resistance to oxidation by water. The Fulton group has established that nZVI supported on a naturally occurring microsilicate (Microsilica600, or “misi”), from a Rotorua geothermal deposit, is capable of removing nitrates from water. This material, or nZVI@misi, minimises the potential bioaccumulation path that nZVI has, and is easier to handle than unsupported nZVI. This research investigated the effect of sulfidation of nZVI@misi (or S-nZVI@misi) on the reactivity towards the degradation of a variety of different potential contaminants.  S-nZVI@misi was synthesised using sodium thiosulfate for sulfidation. Increasing the concentration of the reagent and sulfidation time from 3 hours to 24 hours resulted in high percentages of sulfur-to-iron (S/Fe) for each material. This increase in S/Fe had a significant impact on the removal of cadmium and chromium as with higher the percentage of S/Fe, the faster the removal of these species occurred. Compared to pristine nZVI@misi, S-nZVI@misi was significantly faster at removing both cadmium and chromium. However, sulfidation of nZVI@misi proved to reduce the rate of 4-nitrophenol reduction and prevent nitrate reduction from occurring. Experimental analysis also showed that cadmium removal was faster with S-nZVI supported by FeOOH-coated microsilica, compared to material supported by un-coated microsilica. Therefore, we have synthesised supported S-nZVI that quickly removes cadmium and chromium from solution compared to standard supported nZVI.</p>

scholarly journals Sulfidation of Zero-valent Iron Nanoparticles for Environmental Remediation

2021 ◽  
Author(s):  
◽  
Amanda Berger
Keyword(s):  
Environmental Remediation ◽  
Sodium Thiosulfate ◽  
Zero Valent Iron ◽  
Side Reactions ◽  
Cadmium Removal ◽  
Naturally Occurring ◽  
Nitrophenol Reduction ◽  
Resistance To Oxidation ◽  
Oxidation By Water ◽  
Zero Valent Iron Nanoparticles

<p>The ability of nano-sized zero-valent iron (nZVI) to remove environmental contaminants, from heavy metals to polyhalogenated hydrocarbons, has been well established. However, the reactivity of nZVI towards contaminants is hampered due to competing for side reactions with oxygen and water. Sulfidemodified nZVI (S-nZVI) has become a viable option as S-nZVI has been shown to reduce organic compounds such as trichloroethylene faster than nZVI while also maintaining an increased resistance to oxidation by water. The Fulton group has established that nZVI supported on a naturally occurring microsilicate (Microsilica600, or “misi”), from a Rotorua geothermal deposit, is capable of removing nitrates from water. This material, or nZVI@misi, minimises the potential bioaccumulation path that nZVI has, and is easier to handle than unsupported nZVI. This research investigated the effect of sulfidation of nZVI@misi (or S-nZVI@misi) on the reactivity towards the degradation of a variety of different potential contaminants.  S-nZVI@misi was synthesised using sodium thiosulfate for sulfidation. Increasing the concentration of the reagent and sulfidation time from 3 hours to 24 hours resulted in high percentages of sulfur-to-iron (S/Fe) for each material. This increase in S/Fe had a significant impact on the removal of cadmium and chromium as with higher the percentage of S/Fe, the faster the removal of these species occurred. Compared to pristine nZVI@misi, S-nZVI@misi was significantly faster at removing both cadmium and chromium. However, sulfidation of nZVI@misi proved to reduce the rate of 4-nitrophenol reduction and prevent nitrate reduction from occurring. Experimental analysis also showed that cadmium removal was faster with S-nZVI supported by FeOOH-coated microsilica, compared to material supported by un-coated microsilica. Therefore, we have synthesised supported S-nZVI that quickly removes cadmium and chromium from solution compared to standard supported nZVI.</p>

Nitrate removal by entrapped zero-valent iron nanoparticles in calcium alginate

2008 ◽  
Vol 58 (11) ◽  
pp. 2215-2222 ◽  
Author(s):  
Sita Krajangpan ◽  
Juan J. Elorza Bermudez ◽  
Achintya N. Bezbaruah ◽  
Bret J. Chisholm ◽  
Eakalak Khan
Keyword(s):  
Calcium Alginate ◽  
Environmental Remediation ◽  
Iron Nanoparticles ◽  
Reaction Rates ◽  
Alginate Beads ◽  
Zero Valent Iron ◽  
Calcium Alginate Beads ◽  
N Removal ◽  
Significant Difference ◽  
Zero Valent Iron Nanoparticles

Zero-valent iron nanoparticles (nZVI) were successfully entrapped in calcium alginate beads. The potential use of this technique in environmental remediation using nitrate as a model contaminant was investigated. Kinetics of nitrate degradation using bare nZVI (∼35 nm dia) and entrapped nZVI were compared. Calcium alginate beads show promise as the entrapment medium for nZVI for possible use in permeable reactive barriers for groundwater remediation. Based on scanning electron microscopy images it can be inferred that the alginate gel cluster acts as a bridge that binds the nZVI particles together. Kinetic experiments with 100, 60, and 20 mg NO3−-N L−1 indicate that 50–73% nitrate-N removal was achieved with entrapped nZVI as compared to 55–73% with bare nZVI over a 2 h period. The controls ran simultaneously show little or no NO3−-N removal. Statistical analysis indicates that there was no significant difference between the reaction rates of bare and entrapped nZVI. The authors have shown for the first time that nZVI can be effectively entrapped in Ca-alginate beads and no significant decrease in the reactivity of nZVI toward the model contaminant (nitrate here) was observed after the entrapment.

scholarly journals Preparation of carbon nanofibrous mats encapsulating zero-valent Fe nanoparticles as Fe reservoir for removal of organic pollutants

RSC Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 4883-4889
Author(s):  
Hao Jiang ◽  
Yaomin Li ◽  
Zhengnan Su ◽  
Tiantian Zhang ◽  
Lihui Meng ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Organic Pollutants ◽  
Environmental Remediation ◽  
Iron Nanoparticles ◽  
Zero Valent Iron ◽  
Fe Nanoparticles ◽  
Zero Valent Iron Nanoparticles

Zero-valent iron nanoparticles (ZVI NPs) encapsulated in single-axial and co-axial carbon nanofibers can be used for environmental remediation at different situations.

scholarly journals Synthesis and Application of Zero-Valent Iron Nanoparticles in Water Treatment, Environmental Remediation, Catalysis, and Their Biological Effects

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 917 ◽  
Author(s):  
Tibor Pasinszki ◽  
Melinda Krebsz
Keyword(s):  
Environmental Remediation ◽  
Current Knowledge ◽  
Biological Effects ◽  
Anthropogenic Pollution ◽  
Pollution Source ◽  
High Reactivity ◽  
Inorganic Materials ◽  
Zero Valent Iron ◽  
Mining Sites ◽  
Zero Valent Iron Nanoparticles

Present and past anthropogenic pollution of the hydrosphere and lithosphere is a growing concern around the world for sustainable development and human health. Current industrial activity, abandoned contaminated plants and mining sites, and even everyday life is a pollution source for our environment. There is therefore a crucial need to clean industrial and municipal effluents and remediate contaminated soil and groundwater. Nanosized zero-valent iron (nZVI) is an emerging material in these fields due to its high reactivity and expected low impact on the environment due to iron’s high abundance in the earth crust. Currently, there is an intensive research to test the effectiveness of nZVI in contaminant removal processes from water and soil and to modify properties of this material in order to fulfill specific application requirements. The number of laboratory tests, field applications, and investigations for the environmental impact are strongly increasing. The aim of the present review is to provide an overview of the current knowledge about the catalytic activity, reactivity and efficiency of nZVI in removing toxic organic and inorganic materials from water, wastewater, and soil and groundwater, as well as its toxic effect for microorganisms and plants.

scholarly journals Synthesis of chitosan zero-valent iron nanoparticles-supported for cadmium removal: characterization, optimization and modeling approach

2017 ◽  
Vol 66 (2) ◽  
pp. 116-130 ◽  
Author(s):  
Mehdi Ahmadi ◽  
Majid Foladivanda ◽  
Nemat Jaafarzadeh ◽  
Zahra Ramezani ◽  
Bahman Ramavandi ◽  
...  
Keyword(s):  
Iron Nanoparticles ◽  
Zero Valent Iron ◽  
Cadmium Removal ◽  
Modeling Approach ◽  
Zero Valent Iron Nanoparticles

scholarly journals Performance of Mulberry Leaves Mediated Green Synthesis Zero-Valent Iron Nanoparticles in Dye Removal

2018 ◽  
Vol 7 (3.36) ◽  
pp. 113
Author(s):  
Sin Nie Lim ◽  
Wei Ming Ng ◽  
Jit Kang Lim ◽  
Hui Xin Che
Keyword(s):  
Green Synthesis ◽  
Environmental Remediation ◽  
Iron Nanoparticles ◽  
Zero Valent Iron ◽  
Mulberry Leaves ◽  
Mulberry Leaf ◽  
Uv Visible ◽  
Zero Valent Iron Nanoparticles ◽  
Dyes Degradation

The nanomaterials especially be made of iron, are tapering off the environmental pollution in a sufficiently great way which is worthy for attention. Green synthesis of iron nanoparticles through the extraction of the natural products or wastes has been developed in a way that is more sustainable than the chemical routes associated with several limitations. The mulberry leaves, which are easy available in nature, were chosen for plant-mediated green synthesis of zero-valent iron nanoparticles (nZVI). The characterization of the synthesized nanoparticles was performed with the used of dynamic light scattering (DLS), scanning electron microscope (SEM), and Fourier Transform Infrared Spectroscopy (FTIR). The polyphenols content of the mulberry leaf can be used to synthesize the iron nanoparticles. The iron nanoparticles can be used as the Fenton-like catalyst to enhance the efficiency of dyes degradation. Meanwhile, the iron nanoparticles can be removed by its magnetic properties after the degradation of pollutants which can be reused in subsequent environmental remediation. The efficiency of dyes degradation by the synthesized iron nanoparticles, was investigated by UV-visible spectroscopy (UV-vis). The cationic and anionic model dyes were used to investigate the ability of the synthesized iron nanoparticles in degradation of dye molecules. Methylene Blue was used as the model for cationic dye whereas Methyl Orange was chosen as anionic model dye. The percentage removal of respective dyes was investigated at the different period of time. The work investigated the magnetic and catalytic bi-functionalities of the synthesized iron nanoparticles.  

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