Synthesis and Properties of Iron Oxide Particles Prepared by Hidrothermal Method

Saragi, Togar; Santika, Arum Sinda; Permana, Bayu; Syakir, Norman; Kartawidjaja, Mariah; Risdiana, Risdiana

doi:10.1088/1757-899x/196/1/012025

Cited by 19 publications

(14 citation statements)

References 10 publications

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“…Because of the presence of magnetite (Fe 3 O 4 ) and carbon black in the toner, the absorbance of the CETs in the UV–vis region is substantially enhanced for both rough and smooth texture. Magnetite has high absorption at shorter wavelengths, particularly in the UV region. − …”

Section: Results and Discussionmentioning

confidence: 99%

Waste Egg Tray and Toner-Derived Highly Efficient 3D Solar Evaporator for Freshwater Generation

Ivan

Saleque

Ahmed

et al. 2022

ACS Appl. Mater. Interfaces

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With the advancement of civilization, water purification, as well as management and disposal of ever-increasing municipal solid waste (MSW), and e-waste, have become global concerns. To address these issues in a sustainable way, a 3D solar evaporator has been proposed in this paper by repurposing recycled paper from MSW in the form of egg trays and waste dry toner (e-waste) using a facile fabrication method. The unique 3D porous structure, fibrous surface, superior water absorbing capability as well as low thermal conductivity of wastepaperderived egg trays make them an excellent candidate for an efficient solar evaporator, while the waste toner powder coating significantly enhances the optical absorbance capacity. Under 1 sun illumination, the proposed solar evaporator demonstrates an excellent evaporation rate and efficiency of 1.3 kg/m 2 h and 78.5%, respectively. Moreover, the competitive advantage of the 3D structure in collecting solar irradiance at various light incident angles in comparison to a 2D structure, excellent cycle stability, low processing temperature, and the use of low-cost waste materials enable its use for large-scale water purification systems.

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Section: Results and Discussionmentioning

confidence: 99%

Waste Egg Tray and Toner-Derived Highly Efficient 3D Solar Evaporator for Freshwater Generation

Ivan

Saleque

Ahmed

et al. 2022

ACS Appl. Mater. Interfaces

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show abstract

“…The furnace was turned on after the preforms were placed inside, and the appropriate heating temperature was reached after around 4 h. Preforms were heated for approximately an hour at the desired temperature before the furnace was turned off. The preforms were cooled inside the chamber for 6–7 h before being removed [ 26 ]. As a result, normally sintered preforms were prepared, with a few of these samples depicted in Figure 7 .…”

Section: Methodsmentioning

confidence: 99%

Characteristics of Conventional and Microwave Sintered Iron Ore Preform

Equbal

Ali

Equbal³

et al. 2022

Materials

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In this study, compacted hematite (Fe2O3) preforms were made and sintered at various temperatures, such as 1250 °C and 1300 °C, using both conventional and microwave sintering methods. The density, porosity, microhardness, cold crushing strength, microphotographs, and X-ray diffraction (XRD) analysis of the sintered preforms were used to evaluate the performance of the two sintering methods. It was found that microwave sintered preforms possessed lesser porosity and higher density than conventionally sintered preforms owing to uniform heating of the powdered ore in microwave sintering method. Furthermore, it was also observed that microwave sintered preforms exhibited relatively higher cold crushing strength and hardness than conventionally sintered preforms. Thus, the overall results revealed that microwave sintering yielded better properties considered in the present study.

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“…Pada suhu 1000C-1100C terjadi perubahan fasa dan kembali menjadi hematit dengan struktur kristal rhombohedral seperti yang dilakukan oleh Kazeminezhad [4]. Pada penelitian sebelumnya, kami telah berhasil mengamati struktur kristal hexagonal pada oksida besi yang disintesis melalui metode hidrotermal dengan suhu sintering 1100 o C [5]. Pada paper ini, kami kembali melakukan pengamatan struktur kristal oksida besi pada suhu sintering 1100 o C melalui metode sintesis yang berbeda untuk menguatkan bukti pengamatan kami pada penelitian sebelumnya.…”

Section: Pendahuluanunclassified

“…Berdasarkan Gambar 2 tersebut diperoleh bahwa sampel yang disintering pada suhu 80C memiliki struktur kristal kubik, dan sampel yang disintering pada suhu 1100C memiliki struktur kristal hexagonal. Struktur kristal yang diperoleh pada penelitian ini sama dengan struktur kristal yang diperoleh pada penelitian sebelumnya, oksida besi yang disintesis melalui metode hidrotermal dengan suhu sintering 1100C yaitu hexagonal [5] dan berbeda dengan struktur sebagaimana dilaporkan oleh Kazeminezhad [4]. Perubahan fasa oksida besi dari Fe3O4 dengan struktur kristal kubik menjadi α-Fe2O3 dengan struktur kristal hexagonal dapat terjadi karena perubahan posisi ion-ion penyusunnya ketika proses sintering.…”

Section: Hasil Dan Pembahasanunclassified

Karakteristik Optik dan Kristal Nanopartikel Magnetit

Saragi¹

2018

JIIF

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Abstrak. Oksida besi, nanopartikel magnetit (Fe3O4), memiliki sifat yang berbeda dan lebih menarik daripada material bulk-nya. Selain itu, material ini dapat diaplikasikan secara lebih luas dan efektif pada ukuran nanometernya seperti ferrofluids, media penyimpanan data, pigmen warna, dan katalis. Pada penelitian ini telah berhasil dikarakterisasi sifat optik dan struktur kristal dari nanopartikel magnetit dengan menggunakan teknik Spektroskopi UV-Vis dan teknik difraksi sinar-X. Karakterisasi material nanopartikel magnetit berdasarkan variasi suhu sintering, 80C dan 1100C. Berdasarkan hasil karakterisasi UV-Vis diperoleh bahwa energi-gap dari nanopartikel Fe3O4 ini berada pada rentang energi-gap semikonduktor, 0-3 eV. Berdasarkan hasil karakterisasi XRD diperoleh bahwa Variasi suhu sintering menyebabkan berubahan struktur kristal oksida besi yang diperoleh, yaitu magnetit (Fe3O4) dengan struktur kubik pada suhu 80 o C, dan hematit (α-Fe2O3) dengan struktur hexagonal pada suhu 1100C, sesuai dengan data JCPDS.Kata kunci : Fe3O4, α-Fe2O3, Sintering, UV-Vis,XRD Abstract. Iron Oxide, magnetit (Fe3O4) nanoparticles, has different and more interesting properties than it's bulk materials. Besides that, in nanometer scale, this material can apply more effective and wide application like ferrofluids, data storage, color pigment, and catalyst. In this papper, we have been successfully characterized the optical and crystal structur from magnetit nanoparticles by using UV-Vis spectroscopy and X-ray diffraction technique depends on variation of sintering temperature of 80C and 1100C. From UV-Vis characterization, it was found that the band-gap of sample was around of semiconductor band-gap, 0-3 eV. From XRD characterization, it was found that the variation of sintering temperature can changed the crystal structure of iron oxide, magnetite (Fe3O4) with cubic structure on 80C, hematite (α-Fe2O3) with hexagonal strucrute on 1100C, compared with JCPDS data.

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Synthesis and Properties of Iron Oxide Particles Prepared by Hidrothermal Method

Cited by 19 publications

References 10 publications

Waste Egg Tray and Toner-Derived Highly Efficient 3D Solar Evaporator for Freshwater Generation

Waste Egg Tray and Toner-Derived Highly Efficient 3D Solar Evaporator for Freshwater Generation

Characteristics of Conventional and Microwave Sintered Iron Ore Preform

Karakteristik Optik dan Kristal Nanopartikel Magnetit

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