Preparation and Characterization of Fe&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;/TiO&lt;sub&gt;2&lt;/sub&gt; Composites by Heteroagglomeration

Fisli, Adel; Saridewi, Rahmi; Dewi, Sari Hasnah; Gunlazuardi, Jarnuzi

doi:10.4028/www.scientific.net/amr.626.131

Cited by 16 publications

(3 citation statements)

References 22 publications

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“…Heteroagglomeration may result in permanent contact via interactions between the electrostatic forces of two particles that differ in charge (Islam et al, 1995;Fisli et al, 2013). The isoelectric point (IEP) of TiO 2 is approximately 6.2 (Suttiponparnit et al, 2011), while the isoelectric point of Fe 3 O 4 /SiO 2 is about 3 (Fisli et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Fisli

Ridwan

Krisyuningsih³

et al. 2017

IJTech

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The main problem with the slurry process is the difficulty in recovering the photocatalyst nanoparticle from water following purification. An alternative solution proposed the photocatalyst be immobilized on magnetic carriers, which would allow them to be recollected from the water suspension following treatment using an external magnetic field. Magnetically photocatalyst composites were prepared using simple heteroagglomeration by applying attractive electrostatic forces between the nanoparticles with an opposite surface charge. The Fe 3 O 4 /SiO 2 /TiO 2 photocatalysts were synthesized in an aqueous slurry solution containing Fe 3 O 4 /SiO 2 and TiO 2 nanoparticles under pH 5 conditions. Meanwhile, Fe 3 O 4 /SiO 2 was prepared by a simple procedure via a coprecipitation of iron(II) and iron(III) ion mixtures in ammonium hydroxide and was leached by sodium silicate. The synthesized samples were investigated to determine the phase structure, the magnetic properties, and the morphology of the composites by X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and transmission electron microscopy (TEM), respectively. The results indicated that the composites contained anatase and rutile phases and exhibited a superparamagnetic behavior. Fe 3 O 4 /SiO 2 particles, which were of the aggregation spherical form at 20 nm in size, were successfully attached onto the TiO 2 surface. The catalytic activity of Fe 3 O 4 /SiO 2 /TiO 2 composites was evaluated for the degradation of methylene blue under ultraviolet (UV) irradiation. The presence of SiO 2 as a barrier between Fe 3 O 4 and TiO 2 is not only improves the photocatalytic properties but also provides the ability to adsorb the properties on the composite. The Fe 3 O 4 /SiO 2 /TiO 2 (50% containing TiO 2 in composite) were able to eliminate 87.3% of methylene blue in water through the adsorption and photocatalytic processes. This result is slightly below pure TiO 2 , which is able to degrade 96% of methylene blue. The resulting Fe 3 O 4 /SiO 2 /TiO 2 composite exhibited an excellent ability to remove dye from water and it is easily recollected using a magnetic bar from the water. Therefore, they have high potency as an efficient and simple implementation for the dye effluent decolorization of textile waste in slurry reactor processes.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Fisli

Ridwan

Krisyuningsih³

et al. 2017

IJTech

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“…Furthermore, some nanoferrites like ZnFe 2 O 4 have shown desirable degradation efficiency of organic target compounds under both visible light and UV irradiation [164]. Similar studies have reported degradation of different contaminants using Fe 3 O 4 [165][166][167] (Table 3). A schematic of the use of magnetic nanophotocatalysts (MNPCs) in water treatment [173] is illustrated in Figure 8.…”

Section: Magnetic Nanophotocatalystsmentioning

confidence: 58%

Biomedical Waste Management by Using Nanophotocatalysts: The Need for New Options

et al. 2020

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Biomedical waste management is getting significant consideration among treatment technologies, since insufficient management can cause danger to medicinal service specialists, patients, and their environmental conditions. The improvement of waste administration protocols, plans, and policies are surveyed, despite setting up training programs on legitimate waste administration for all healthcare service staff. Most biomedical waste substances do not degrade in the environment, and may also not be thoroughly removed through treatment processes. Therefore, the long-lasting persistence of biomedical waste can effectively have adverse impact on wildlife and human beings, as well. Hence, photocatalysis is gaining increasing attention for eradication of pollutants and for improving the safety and clearness of the environment due to its great potential as a green and eco-friendly process. In this regard, nanostructured photocatalysts, in contrast to their regular counterparts, exhibit significant attributes such as non-toxicity, low cost and higher absorption efficiency in a wider range of the solar spectrum, making them the best candidate to employ for photodegradation. Due to these unique properties of nanophotocatalysts for biomedical waste management, we aim to critically evaluate various aspects of these materials in the present review and highlight their importance in healthcare service settings.

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“…In the Raman spectra, it was also observed the new peaks at 226, 245 and 292 cm -1 for 30Fe/Ti and 40Fe/Ti which were ascribed to the hematite phase of iron oxide, but magnetite phase was not detected. The magnetite phase can change into hematite phase due to a temperature increase of several hundred degrees during the use of a strongly focused laser on Raman measurement [25]. Typical TEM images of 40% Fe/Ti are presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

Iron oxide/titania composites for radar absorbing material (RAM) applications

et al. 2019

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Iron oxide/titania composites were synthesized by precipitation method. Amount of iron oxide was varied in the composites. The single phase (anatase) was obtained for the weight ratio of 0-20% and three phases (anatase, magnetite and hematite) were found for the weight ratio of 30% and 40% of iron oxide. The crystallite size of titania decreased with increasing of iron oxide content. The specific surface area, total pore volume and BJH pore volume of the sample increased with increasing iron oxide content in the composite. The composites possessed mesoporous characteristic (6.5-9.6 nm in pore diameter) and exhibited ferromagnetic properties. The measurement of the microwave absorption showed that the 40Fe/Ti composite had the best reflection loss of -14 dB at a frequency of 10.9 GHz. This meant that the electromagnetic wave was absorbed 80% in that frequency. Thus, the developed material can be a promising microwave absorbing agent in radar signature reduction.

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Preparation and Characterization of Fe<sub>3</sub>O<sub>4</sub>/TiO<sub>2</sub> Composites by Heteroagglomeration

Cited by 16 publications

References 22 publications

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Biomedical Waste Management by Using Nanophotocatalysts: The Need for New Options

Iron oxide/titania composites for radar absorbing material (RAM) applications

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