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

Abstract

In this work, disc-like hematite (Fe2O3) nanoparticles were prepared using a readily available inexpensive earth material, ferruginous laterite, via a low-cost synthesis route. Prepared hematite nanoparticles were characterized using X-Ray diffraction (XRD), inductively coupled plasma mass spectroscopy (ICP-MS), particle size analyzer (PSA), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and nitrogen adsorption-desorption analyzer. The performance of hematite nanoparticles was evaluated as a heavy metal ion adsorbent. Batch adsorption experiments were conducted to study the adsorption behaviour of Ni2+ and Cd2+ ions as a function of the amount of adsorbent, contact time, and pH. Adsorption data fitted to the linearized Langmuir and Freundlich kinetic models were compared and discussed. The correlation coefficient (R2) was used to determine the best fit kinetic model. Our data fitted the Langmuir kinetic model well and the highest adsorption efficiencies were found to be 62.5 mg/g for Ni2+ and 200 mg/g for Cd2+, respectively. Due to high surface area, pore volume with active sites, and sorption capabilities, hematite nanoparticles can be used as efficient and economical nano-adsorbents for the removal of Ni2+ and Cd2+ ions from industrial wastewater.

Recent Advances in Biopolymer-Based Dye Removal Technologies

“…The adsorption process is described at the equilibrium using adsorption isotherms that quantify the amount of the substance adsorbed per unit mass of adsorbent as a function of the equilibrium concentration of the adsorbate [ 40 ]. Commonly used adsorption isotherms are the Langmuir and Freundlich isotherm models [ 41 ]. Other adsorption isotherms include Tempkin, Dubinin–Radushkevich, Flory–Huggins, Hill, and Redlich–Peterson, Toth, Radke–Prausnitz, Koble–Corrigan, Sips, Fritz–Schluender, Jovanovic, Brunauer–Emmett–Teller, MacMillan–Teller, Vieth-Sladek, Harkins–Jura, Halsey, Frenkel–Halsey–Hill, Henderson, Valenzuela-Myers, Baudu and Elovich [ 42 ].…”

3D interconnected polymer/mesoporous silica nanoparticle hybrid materials with hierarchical macro/meso-structures for heavy metal adsorption

“…Among them, adsorption is mainly used, because it is highly efficient, easy to use, relatively inexpensive, and the adsorbent agents can be reused several times. 5,9–19 However, conventional adsorbent agents such as fibers, foams, and resins have low surface area, making them less active and inefficient. 5,13,16 To address these shortcomings, numerous studies have reported new adsorbent materials based on metal nanoparticles, 5,15,17,20,21 polymers, 13 modified biomolecules, 10–12 and porous materials.…”

“…5,13,16 To address these shortcomings, numerous studies have reported new adsorbent materials based on metal nanoparticles, 5,15,17,20,21 polymers, 13 modified biomolecules, 10–12 and porous materials. 9,14,22…”

Treatment of As(III)-Laden Contaminated Water Using Iron-Coated Carbon Fiber

“…On the basis of economical, eco-friendly, and treatment performance, adsorption represents one of the most promising options to remove As from contaminated wastewater [6]. Adsorbents from low-cost sources such as agricultural waste [7], industrial by-products [8], and natural minerals [9,10] have been investigated for the treatment of contaminated water laden with heavy metals such as As, Cr, and Ni.…”