Green synthesis and characterization of amorphous silica nanoparticles from fly ash

Yadav, Veejendra K.; Fulekar, M. H.

doi:10.1016/j.matpr.2019.07.395

Cited by 45 publications

(21 citation statements)

References 21 publications

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“…The EDS revealed the purity, as there were only peaks for Si and O, mainly along with minor peaks of trace elements. The FTIR revealed the three characteristic bands in the region of 400-1200 cm −1 and XRD revealed broad humps with a peak centered at 2-theta 22 • , which confirms the amorphous nature of the SiNPs [182]. The summarized form of the chemically-mediated extraction and synthesis of silica from fly ash are given in Table 6.…”

Section: Silica Extraction From Fly Ash By Chemical Methodsmentioning

confidence: 76%

Advances in Methods for Recovery of Ferrous, Alumina, and Silica Nanoparticles from Fly Ash Waste

Yadav

Fulekar

2020

Ceramics

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Fly ash or coal fly ash causes major global pollution in the form of solid waste and is classified as a “hazardous waste”, which is a by-product of thermal power plants produced during electricity production. Si, Al, Fe Ca, and Mg alone form more than 85% of the chemical compounds and glasses of most fly ashes. Fly ash has a chemical composition of 70–90%, as well as glasses of ferrous, alumina, silica, and CaO. Therefore, fly ash could act as a reliable and alternative source for ferrous, alumina, and silica. The ferrous fractions can be recovered by a simple magnetic separation method, while alumina and silica can be extracted by chemical or biological approaches. Alumina extraction is possible using both alkali- and acid-based methods, while silica is extracted by strong alkali, such as NaOH. Chemical extraction has a higher yield than the biological approaches, but the bio-based approaches are more environmentally friendly. Fly ash can also be used for the synthesis of zeolites by NaOH treatment of variable types, as fly ash is rich in alumino-silicates. The present review work deals with the recent advances in the field of the recovery and synthesis of ferrous, alumina, and silica micro and nanoparticles from fly ash.

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Section: Silica Extraction From Fly Ash By Chemical Methodsmentioning

confidence: 76%

Advances in Methods for Recovery of Ferrous, Alumina, and Silica Nanoparticles from Fly Ash Waste

Yadav

Fulekar

2020

Ceramics

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“…This is similar to the findings of Kamilah [34] where sugar cane bagasse was used for nanosilica synthesis. The EDX shows the most abundant element is silica with relative abundance value of 74.6 % greater than a value of 25.74% as in the case of another researcher Yadav [35] where nanosilica was synthesized from fly ash.…”

Section: Characterization Of Synthesized Nanosilicamentioning

confidence: 95%

Untitled

2021

Nano Plus: Sci. Tech. Nanomat.

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The idea of sourcing for innovative construction Supplementary Cementitious Materials (SCM) in concrete or mortar cannot be overemphasized. Metakaolin has always been used to replace cement in concrete or mortar batching on site. This research investigated the properties of factory produced blended cement using metakaolin obtained from three different sources and consider effects of nanosilica on blended cement mortar. The kaolin clay sourced from Ijero, Ikere, and Isan in Ekiti states were calcined at 700 ˚C for 1 hour and thereafter, characterized using X-Ray Fluorescence Analyser (XRF) and X-Ray Diffraction Analysis (XRD). Ordinary Portland Cement (OPC) clinker and 10% metakaolin were used to produce blended cement. Liquid nanosilica was synthesized from cola pod extract and silica precursor in ratio 1:5. A cement-sand ratio of 1:3 and water/binder ratio of 0.5 were used to produce metakaolin blended cement mortar with addition of nanosilica in varying percentages of 1, 2, 3, 4 and 5% by weight of the binder. The setting times and water demand of the blended cement mortar were determined. The results revealed that the setting times and water demand were observed to reduce as the percentage of nanosilica was increased to a level of 4%. In addition, results of the XRF classified metakaolin as class N pozzolans with the addition of SiO 2 , Al 2 O 3 , Fe 2 O 3 greater than 70%. Also, the SO 3 for all the clay was found to be less than 4% and the peak intensities as reflected on the XRD showing the amorphous nature of the silica.

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“…Among them, the physical approaches include sputtering [64], laser ablation [65], pyrolysis [66], lithography [67], and hot and cold plasma [67]. Meanwhile, the chemical methods that are used most frequently are lyotropic liquid crystal templates [68], electrochemical deposition [69], electroless deposition [70], hydrothermal [71] and solvothermal techniques [72], sol gel technique [73,74], laser chemical vapor deposition technique [75], laser pyrolysis [76], and chemical vapor deposition [77]. The nanomaterials could also be synthesized by biological approaches like microbial [78] and plant derived materials [79].…”

Section: Different Methods Of Nanomaterials Synthesismentioning

confidence: 99%

“…Chemical methods have contributed to the fabrication of materials at the nanoscale [95]. The Chemical methods have several advantageous properties over physical methods as the previous one involves mixing of chemical at the molecular level which ensures good chemical homogeneity [74,96]. Chemical reduction methods are reported to have numerous drawbacks for instance utilization toxic reagents and solvents, generation of unwanted by-products due to which there are several extra steps is needed for removal of impurities, time-consuming [97].…”

Section: Chemical Methods For Synthesis Of Nanomaterialsmentioning

confidence: 99%

Recent Advances on Properties and Utility of Nanomaterials Generated from Industrial and Biological Activities

et al. 2021

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Today is the era of nanoscience and nanotechnology, which find applications in the field of medicine, electronics, and environmental remediation. Even though nanotechnology is in its emerging phase, it continues to provide solutions to numerous challenges. Nanotechnology and nanoparticles are found to be very effective because of their unique chemical and physical properties and high surface area, but their high cost is one of the major hurdles to its wider application. So, the synthesis of nanomaterials, especially 2D nanomaterials from industrial, agricultural, and other biological activities, could provide a cost-effective technique. The nanomaterials synthesized from such waste not only minimize pollution, but also provide an eco-friendly approach towards the utilization of the waste. In the present review work, emphasis has been given to the types of nanomaterials, different methods for the synthesis of 2D nanomaterials from the waste generated from industries, agriculture, and their application in electronics, medicine, and catalysis.

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Green synthesis and characterization of amorphous silica nanoparticles from fly ash

Cited by 45 publications

References 21 publications

Advances in Methods for Recovery of Ferrous, Alumina, and Silica Nanoparticles from Fly Ash Waste

Advances in Methods for Recovery of Ferrous, Alumina, and Silica Nanoparticles from Fly Ash Waste

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Recent Advances on Properties and Utility of Nanomaterials Generated from Industrial and Biological Activities

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