Novel magnetic core–shell Ce–Ti@Fe₃O₄ nanoparticles as an adsorbent for water contaminants removal

Abstract

Magnetic core-shell Ce-Ti@Fe 3 O 4 nanoparticles were synthesized by coating cerium titanate on magnetite under mild experimental conditions. Combining magnetism, crystallinity, stability and adsorption capacity, it can be a promising nanomaterial as an adsorbent for anionic water contaminants, exhibiting high removal capacity, from 85% to 100%, for nitrates, phosphates and fluoride.Contamination of water is a widespread problem throughout the world as a result of pollution and a wide range of pollutants can be considered for remediation. 1 Thus, the development of new technologies is fundamental. Among all the current decontamination methods, adsorption is considered the most effective, environmentally friendly, and economical method for contaminant removal. 2 In addition, nanotechnology can offer new products and process alternatives for water purication. 3 Some examples are based on nanoparticles (NPs), nanomembranes, carbon nanotubes (CNTs) and nanobers, among others. 4 Thus, the use of adsorbents nanomaterials has become an interesting way for the removal of various contaminants from drinking water 5 such as of heavy metals 6 and, in a minor extent, nutrients. 7 For instance, the use of CeO 2 , Fe 3 O 4 and TiO 2 NPs and magnetic nanocomposite 7 for the adsorption of cadmium 8 and phosphate 7,9 has been reported by our group. Finally, other metal oxides and metal hydroxides had also been reported 10 for uoride removal from water as well as bimetallic or mixed oxides. 11 Further, it is worthy to consider the reusability and the regeneration of the adsorbents as well as the trapping of the NPs to prevent its environmental and health safety risks. 12 Thus, the use of magnetic NPs for pollutants removal provides efficient, easy separation, and reusability. The magnetic NPs can be either used directly or as the core material in a core-shell NPs structure. 13 For instance, cerium titanates nanomaterials (Ce 2/3 TiO 3 ) have many applications as photocatalytic and ferroelectric materials. 14 However, its properties exhibits canted-antiferromagnetic order 15 and few studies for improving its properties have been reported. 16 In this work, a novel nanomaterial was synthesized by coating cerium titanate on magnetite NPs using a simple and easy method as one step synthesis under room temperature to obtain magnetic core-shell Ce-Ti@Fe 3 O 4 NPs (shell@core). Moreover, its efficiency was demonstrated for water remediation as a versatile nanoadsorbent for typical inorganic contaminants.Briey, the synthesis of the nanoadsorbent here reported was based in the following procedure: previously of the synthesis of the core-shell Ce-Ti@Fe 3 O 4 NPs, magnetite nanoparticles (Fe 3 O 4 -NPs) were prepared by the co-precipitation method as reported elsewhere 7,17 by using cetyl trimethyl ammonium bromide, CTAB, as dispersant. During the synthesis, the mixture's colour turned from light yellow to red brown and then eventually to black which conrmed the formation of Fe 3 O 4 -NPs. Once the Fe 3 O 4 -NPs were washed and dried, Ce-...

Critical review of existing nanomaterial adsorbents to capture carbon dioxide and methane

“…Several articles on water purification processes using NPs have been published focusing on the removal of metals (Contreras et al, 2015;Recillas et al, 2010;Sánchez et al, 2011;Xu and Zhao, 2007) or nutrients (Abo Markeb et al, 2016a;Abo Markeb et al, 2016b;Choe et al, 2000;Sá et al, 2009). This shows the potential of nanotechnology to remove contaminants.…”

Pretreatment by recyclable Fe3O4@Mg/Al-CO3-LDH magnetic nano-adsorbent to dephosphorize for the determination of trace F− and Cl− in phosphorus-rich solutions

“…8 and 9 in Section 3.2, respectively). According to the literature, phosphate adsorption by some non-LDH adsorbents [66][67][68][69][70] and some LDH adsorbents [23][24][25][26]31,33 is greatly affected by F À or Cl À due to their adsorption. For LDHs, considering the bonding strength between the layers and interlayer anions in aqueous solution, 17 the strength of phosphates is generally higher than that of F À and Cl À .…”

Selective Adsorption of Aqueous Diclofenac Sodium, Naproxen Sodium, and Ibuprofen Using a Stable Fe3O4–FeBTC Metal–Organic Framework

“…Chen et al [20] used a MIL-100 (Fe) On the other hand, magnetite has proven to be an excellent candidate for removing pollutants in an aqueous medium [13]. Its ability to incorporate quite well with other materials [14][15][16] increases adsorption capacity and recovery in aqueous medium and thermal stability [17]. Although MOFs included with magnetite have already been studied, few have been applied to remove contaminants in aqueous media [14,18].…”

“…Its ability to incorporate quite well with other materials [ 14 , 15 , 16 ] increases adsorption capacity and recovery in aqueous medium and thermal stability [ 17 ]. Although MOFs included with magnetite have already been studied, few have been applied to remove contaminants in aqueous media [ 14 , 18 ]. Giesy et al [ 19 ] reported one of the first works to incorporate magnetite in MOFs using HKUST-1 included with magnetic material to remove colorants from water, showing a clear increase in the removal capacity of methylene blue.…”