Titan Yellow and Congo Red Removal with Superparamagnetic Iron-Oxide-Based Nanoparticles Doped with Zinc

Abstract

In this work, we present magnetic nanoparticles based on iron oxide doped with zinc synthesized using the wet co-precipitation method for environmental application. The morphology of the samples was revealed by SEM and TEM, which showed particles of granular shape and size of about 15 nm. The specific surface areas of the materials using the BET method were within the range of 85.7 to 101.5 m2 g−1 depending on the zinc content in the superparamagnetic iron oxide nanoparticles (SPIONs). Magnetometry was performed to determine the magnetic properties of the particles, indicating superparamagnetism. Synthesized magnetic nanoparticles with different amounts of zinc dopant were used as an adsorbent to remove model pollutant Titan yellow (TY) from the aqueous solutions. Adsorption was determined by investigating the effects of sorbent amount, dye concentration, and contact time. The synthesized material removed Titan yellow quickly and efficiently within the physical adsorption. The adsorption isotherms were consistent with the models proposed by Langmuir and Redlich-Peterson. The monolayer adsorption capacities were 30 and 43 mg g−1 for Fe3O4 and Fe3O4@10%Zn, respectively, for the removal of TY. However, that of Congo red is 59 mg g−1 by Fe3O4@10%Zn. The proposed nanoparticles offer fast and cost-effective water purification, and they can be separated from solution using magnets.

Upcycling of Acid-Leaching Solutions from Li-Ion Battery Waste Treatment through the Facile Synthesis of Magnetorheological Fluid

“…The M s values for samples 1 and 3 are 84.4 and 65.6 emu g −1 , respectively. The values of the saturation magnetization and the shape of the hysteresis for sample 1 are similar to the characteristics of the bare iron oxide nanoparticles, where M s is about ~90 emu g −1 [ 38 , 39 , 40 , 41 ]. According to the values for the nanoparticles obtained from the hydrometallurgical waste, Sankaran et al present ferromagnetic Co 0.87 Ni 0.13 Fe 2 O 4 and CoFe 2 O 4 nanoparticles with M s of about 62 emu g −1 and a coercivity of about 1420 and 760 Oe, respectively [ 32 ].…”

Synthesis of Fe2O3@SnO2 Core‐shell Nanocomposites via Thermal Decomposition Route and their Application as an Adsorbent

“…The adsorption of CR using Fe 2 O 3 @SnO 2 core‐shell nanocomposites (FS‐1‐C) thus follows Langmuir adsorption isotherm [85,86] . In the current work, the time required for the complete adsorption of CR and adsorption capacity for the adsorbents were compared with the data reported [87–97] . (Table S10) The reported adsorbents take longer time (60–3000 min) for the adsorption of congo red and the adsorption capacity varies from 16.6 mg g −1 to 259.0 mg g −1 .…”

“…[85,86] In the current work, the time required for the complete adsorption of CR and adsorption capacity for the adsorbents were compared with the data reported. [87][88][89][90][91][92][93][94][95][96][97] (Table S10) The reported adsorbents take longer time (60-3000 min) for the adsorption of congo red and the adsorption capacity varies from 16.6 mg g À 1 to 259.0 mg g À 1 . The Fe 2 O 3 @SnO 2 core-shell nanocomposites (e. g. FS-1-C) adsorb congo red completely in 5 minutes with good adsorption capacity (88.7 mg g À 1 ).…”

Iron–Iron Oxide Core–Shell Nanochains as High-Performance Adsorbents of Crystal Violet and Congo Red Dyes from Aqueous Solutions

“…So far, several techniques, which allow removing the dyes from water, have been successfully applied, including coagulation, advanced oxidation, membrane separation, and biochemical degradation, but the most promising method is adsorption due to its high efficiency, moderated operating costs, simple operation process, ability to treat concentrated forms of the dyes, and the possibility of adsorbent regeneration. ,, In fact, many dye-absorbing materials have been already reported in the literature, including biomass-derived activated carbons, − cellulose-based materials, , natural and chemically modified zeolites, − as well as magnetically active nanomaterials. ,,,− Among them, iron-based nanostructures are very attractive. This is associated with the abundance of iron and its compounds on the Earth, nontoxicity of iron compounds, as well as unique chemical, physical, and mechanical properties resulting from their high surface-to-volume ratios. , It is also worth noting that iron can appear in various valence states, i.e., Fe 0 , Fe 2+ , and Fe 3+ .…”