Superparamagnetic Spinel-Ferrite Nano-Adsorbents Adapted for Hg, Dy, Tb Removal/Recycling: Synthesis, Characterization, and Assessment of Toxicity.

In the present work, superparamagnetic adsorbents based on 3-aminopropyltrimethoxy silane (APTMS)-coated maghemite (γFeO@SiO-NH) and cobalt ferrite (CoFeO@SiO-NH) nanoparticles were prepared and characterized using transmission-electron microscopy (TEM/HRTEM/EDXS), Fourier-transform infrared spectroscopy (FTIR), specific surface-area measurements (BET), zeta potential (ζ) measurements, thermogravimetric analysis (TGA), and magnetometry (VSM). The adsorption of Dy, Tb, and Hg ions onto adsorbent surfaces in model salt solutions was tested. The adsorption was evaluated in terms of adsorption efficiency (%), adsorption capacity (mg/g), and desorption efficiency (%) based on the results of inductively coupled plasma optical emission spectrometry (ICP-OES).

Removal of Pb, CrT, and Hg Ions from Aqueous Solutions Using Amino-Functionalized Magnetic Nanoparticles.

In this paper, a circular economy approach with the adsorption and desorption of heavy metal (HM) ions—i.e., lead (Pb2+), chromium (CrT), and mercury (Hg2+)—from aqueous solutions was studied.

Adsorption of rare earth metals from wastewater by nanomaterials: A review.

Rare earth elements are widely used in chemical engineering, the nuclear industry, metallurgy, medicine, electronics, and computer technology because of their unique properties. To fulfil ever increasing demands for these elements, recycling of rare-earth-element-containing products as well as their recovery from wastewater is quite important. In order to recover rare earth elements from wastewater, their adsorption from low-concentration aqueous solutions, by using nanomaterials, is investigated due to technological simplicity and high efficiency.

Synthesis and characterization of novel γ-FeO-NHOH@SiO(APTMS) nanoparticles for dysprosium adsorption.

This paper deals with synthesis and characterization of novel γ-FeO-NHOH@SiO(APTMS) nanoparticles formed from magnetic γ-FeO core, stabilized electrostatically in basic media NHOH, doped with SiO shell and functionalized with 3-aminopropyltrimethoxysilane. The gradually synthesized nanoparticles are characterized in order to analyze their structural, morphology, thermogravimetry, surface area and charge, and magnetic properties. The novel synthesized γ-FeO-NHOH@SiO(APTMS) nanoparticles are suitable to adsorb dysprosium ions (Dy), as one of the most critical rare earth elements, from aqueous solution.

Terbium Ion Adsorption from Aqueous Solution by Using Magnetic γFeO-NHOH@SiO Nanoparticles Functionalized with Amino Groups.

New magnetic stabilized and functionalized core@shell nanoparticles (NPs) were synthesized in a simple way and characterized in order to adsorb Tb from aqueous solution with a very low Tb concentration. For the fluorescence determination of adsorption efficiency and capacity, tiron monohydrate as a ligand was used. The obtained results confirm the potential of the synthesized magnetic γ-FeO-NHOH@SiO NPs, functionalized with (3-Aminopropyl) trimethoxysilane (APTMS), to be used for adsorption of Tb from aqueous solution, with the possibility of its removal from aqueous solution via an external magnet.

His6-OPH enzyme-based bio-hybrid material for organophosphate detection.

In this work, we report on the development of a bio-sensing film for the detection of organophosphorous compounds using sol-gel technology. A novel sol-gel immobilization method employing tetraethoxysilane/3-glycidoxypropyltrimethoxysilane/water hybrid material was developed and used to immobilize the hexahistidine-tagged organophosphorous hydrolase enzyme (His(6)-OPH). Bio-sensing layers with encapsulated His(6)-OPH of various structures (water/silane, precursor ratios) have been prepared.