Applications of Nanotechnology in Water Treatment

Machado, Aline Belem; Rodrigues, Gabriela Zimmermann Prado; Feksa, Luciane Rosa; Berlese, Daiane Bolzan; Tundisi, José Galízia

doi:10.25112/rco.v1i0.1706

Cited by 10 publications

(2 citation statements)

References 37 publications

(43 reference statements)

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“…As a result, the parameter TOD that is the sum of COD and BOD, is considered as a standard reference parameter for the evaluation of wastewater organic pollution [9]. Among numerous techniques, photocatalytic decomposition is broadly used for water treatment because the procedure is a simple and low cost method of efficiently eliminating organic chemical compounds in aqueous phase, and it produces water and small inorganic by-products that are not environmentally hazardous [2,3,7,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

One-pot hydrothermal synthesis and characterization of magnetic nanocomposite of titania-deposited copper ferrite/ferrite oxide for photocatalytic decomposition of methylene blue dye

et al. 2019

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The pure titania (TiO 2) and the heterogeneous ternary magnetic nanocomposite of copper ferrite/ferrite oxide (CuFe 2 O 4 / Fe 2 O 3) deposited by titanium dioxide (TiO 2) were fabricated using a facile one-pot hydrothermal synthesis for the photocatalytic decomposition of methylene blue (MB) dye, under visible light. The nanocomposite was encoded as TCF in this work, where T stands for TiO 2 , C for CuFe 2 O 4 and F for Fe 2 O 3. Various techniques such as powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy, diffuse reflectance spectroscopy, nitrogen physisorption, and vibrational sample magnetometry (VSM) were used to characterize the prepared samples. The PXRD data showed that the samples had pure anatase structure and the average crystal size of anatase TiO 2 in the pure titania and ternary nanocomposite were calculated 147 Å and 135 Å, respectively. The nitrogen physisorption analysis data showed that the pore diameter was increased from 10.6 nm in pure titania to 16.0 nm in TCF. The pore volume was also increased from 0.316 in titania to 0.383 cm 3 /g in TCF sample. It also increased the typical magnitude of the mesopores' diameter and volume per weight but it reduced the specific surface area of the samples. The VSM analysis of the ternary nanocomposite showed a considerable magnetic property of the sample (1.99 emu/g), qualifying it as a paramagnetic material. The photocatalytic decomposition efficiency of MB reached 77% and 68% in the presence of pure titania and TCF ternary nanocomposite, after 240-min exposure by the visible light. Active species trapping experiments showed that the major active species responsible for the photodecomposition of MB in the presence of TCF are O ⋅− 2 radicals and holes (h +).

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Section: Introductionmentioning

confidence: 99%

One-pot hydrothermal synthesis and characterization of magnetic nanocomposite of titania-deposited copper ferrite/ferrite oxide for photocatalytic decomposition of methylene blue dye

et al. 2019

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“…As nanopartículas possuem também aplicações ambientais, possibilitando a fabricação de materiais sustentáveis (como a Química Verde), a remediação de materiais contaminados com substâncias perigosas e a fabricação de sensores para monitoramento ambiental (Khan et al, 2017). Ainda há possibilidades de uso no tratamento da água, objetivando a remoção de metais pesados e óleos, combate a atividade antimicrobiana e a dessalinização (Machado et al, 2019); e controle de incêndios, através do aumento da resistência dos materiais ao fogo e criação de novas substâncias para seu combate (Olawoyin, 2018).…”

Section: Aplicações E Impactos Das Nanopartículasunclassified

Modelagem matemática da separação de nanopartículas em campo elétrico

Borges¹

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In recent decades, has been a growing interest in study of nanotechnology applied to engineering systems and related fields. This is due to numerous applications that can be developed, including employment in chemical and pharmaceutical industries, in separation processes and in different fields of medicine. Thus, characterizing a nanoparticle stream with respect to its particle size distribution has fundamental importance in order to understand how they may interfere with people's daily lives. For this purpose, one of the used devices is the Differential Mobility Analyzer (DMA). In general, DMA is based on electric mobility technique, which consists in separating charged particles with a certain charge when crossing a specific electric field. Thus, for each particle size running through the equipment, a different profile is observed, and only particles with a certain size range will be collected in the DMA classification slit, obtaining a monodisperse aerosol stream from a polydisperse stream at the equipment entrance. The main objective of this study is to propose a systematic methodology for the characterization of the aerosol flow at entrance of two DMAs equipment, designed and built at FEQUI/UFU, by formulating and solving an inverse problem using the Differential Evolution (DE) algorithm. For this, the experimental data reported by Gomes (2018) and Camargo (2019) for different saline concentrations in polydispersed aerosol were considered, which were treated using methodologies present in literature, as well as new approaches proposed in this study. The results showed that the DMA devices used could be treated by the proposed models, identifying the potential of these devices to be adopted as an alternative to commercial equipment; as well as the convergence potential of the DE tool for the same solution from different runs. In addition, one of the adopted models showed the ability to estimate the particle size distribution for a given inlet aerosol intermediate concentration from information of two other concentrations.

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Application of Nanomaterials for Remediation of Pollutants from Mine Water Effluents

Vunain¹

2022

Application of Nanotechnology in Mining Processes

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Applications of Nanotechnology in Water Treatment

Cited by 10 publications

References 37 publications

One-pot hydrothermal synthesis and characterization of magnetic nanocomposite of titania-deposited copper ferrite/ferrite oxide for photocatalytic decomposition of methylene blue dye

One-pot hydrothermal synthesis and characterization of magnetic nanocomposite of titania-deposited copper ferrite/ferrite oxide for photocatalytic decomposition of methylene blue dye

Modelagem matemática da separação de nanopartículas em campo elétrico

Application of Nanomaterials for Remediation of Pollutants from Mine Water Effluents

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