Facile and low-cost synthesis of pure hematite (α-Fe₂O₃) nanoparticles from naturally occurring laterites and their superior adsorption capability towards acid-dyes

Abstract

High purity hematite nanoparticles have been synthesized by a facile method using naturally occurring laterites for industrial dye effluent treatment applications.

Eco-Friendly, Green Packaging Materials from Akaganeite and Hematite Nanoparticle-Reinforced Chitosan Nanocomposite Films

“…Ferruginous Laterite. Extraction of Fe 3+ ions from laterites to the acid solution was performed by mixing 10 g of laterite powder (250 μm particle size), 20 ml of 5 M HCl solution, and 20 ml of distilled water under reflux condition for 5 h at 100°C as in [31]. The supernatant was separated by filtration and treated with 5 g of urea under reflux conditions at 90°C for 5 h. The resultant precipitate was separated by centrifugation, washed by 3 sediment-decant cycles, and oven-dried to get ANPs.…”

“…The diffraction patterns were analyzed using the XPowder12 software package with the aid of the ICDD PDF-2 database. 3 Journal of Nanomaterials and the urea-assisted nanoparticle synthesis method were discussed elsewhere [31]. Due to the low cost and noncomplexity, the above method was applied to produce hematite nanoparticles (HNPs) by calcination of akaganeite nanoparticles (ANPs).…”

“…Nevertheless, the nanomaterials used in this study are extracted directly from an earth material called laterites. As stated in the method developed by the authors previously [31], these nanoparticles are cost-effective and industrially viable.…”

“…In this work, we reinforced CH polymer films by hematite nanoparticles (HNPs) and akaganeite nanoparticles (ANPs) by developing polymer nanocomposites and investigated their properties in relation to advanced green packaging applications. Hematite and akaganeite nanoparticles were synthesized using naturally occurring widely distributed ferruginous laterites [31,32], and these nanoparticles were incorporated into CH by solution casting. The mor-phological, thermal, chemical, optical, and mechanical properties of synthesized nanocomposites were investigated using SEM, XRD, TGA, FTIR, UV-Vis-IR spectrometer, and tensile tester.…”

Synthesis of Hematite Nanodiscs from Natural Laterites and Investigating Their Adsorption Capability of Removing Ni2+ and Cd2+ Ions from Aqueous Solutions

“…Although there is a high potential of laterites to be used in synthesizing value-added iron-based nanomaterials, limited work has been conducted so far. Commonly studied iron-based nanomaterials include magnetite (Fe 3 O 4 ) [29], goethite(α-FeOOH) [30], and hematite(Fe 2 O 3 ) [31][32][33]. Among those, hematite nanoparticles have been investigated for a range of applications, including adsorption [18,[34][35][36][37], water splitting [38,39], photochemical [40,41], catalytic [40,42], and electrochemical [43,44] processes.…”