Synthesis and evaluation of microwave absorption properties of Fe ₃ O ₄ /Halloysite/polypyrrole nanocomposites

A magnetic X-band frequency microwave nanoabsorbent made of iron oxide/halloysite nanostructures combined with polystyrene

“…Afterward, a fairly gradual degradation trend is seen at the temperature above 500 °C, which is related to degradation of Fe 3 O 4 and HNTs. 53 The Fe 3 O 4 nanoparticles have good thermal stability up to 750 °C. 84 Also, dehydroxylation of halloysite nanotube occurred at 480–640 °C.…”

“…50 As a suitable substrate for the composition of Fe 3 O 4 NPs, the materials with alumina and silica network (like halloysite nanotubes, abbreviated as HNTs) are effective for microwave absorption, too. [51][52][53] Due to the presence of silicon and especially aluminum, this type of materials is effective in increasing the microwave absorption capability. 54 Moreover, its unique structure (mineral nanotubes with high surface area) would be appropriate for incorporation of the magnetite nanoparticles through a layer-by-layer manner, which is effective in increasing of the EMI.…”

Synthesis of Pectin/ Fe 3 O 4 / Bentonite nanocomposite hydrogel and investigation of heavy metal (Pb 2+ , Cu 2+ , and Cd 2+ ) adsorption properties from water

“…The peak in the range of 1050-1116 cm -1 is related to C-O and the peak in the range of 2809-2925 cm -1 is related to C-H vibrations, which confirms the cross-links on the surface of iron oxide nanoparticles. The presence of the O-H group on the surface of nanoparticles can be seen with peaks in the range of 2500 to 3600 cm -1 corresponding to hydrogen bond vibrations [10,18]. The FTIR investigation of bentonite clay showed bands at 466, 519, and 915cm −1 , which may be allocated to octahedral (Si-O-Si), (Al-Al-O), and…”

“…Due to their unique properties, magnetic Fe3O4 nanoparticles are used in many different fields, including industry and medicine. Due to the ease of manufacturing, low production cost, and suitable coating, iron oxide nanoparticles are a sensible option for magnetic separation technology [17,18]. Bentonite is one of the low-cost adsorbents that can increase the adsorption property of nanocomposite due to its unique properties.…”

Preparation of Fe3O4 -HNTs-polypyrrole nanocomposite for efficient adsorption of Cu(II) and Cd(II) from aqueous solution

“…Synthesis of the Fe3O4-HNTs was carried out according to the guideline reported in ref. [29] and shown schematically in figure 1a. In short: At first, 0.5 g of HNTs was dissolved in 200 ml of distilled water and then 1.65 g of FeCl3.6H2O and 0.430 g of FeCl2.4H2O were added to the solution.…”