Synthesis and Characterization of Magnetic Nanomaterials with Adsorptive Properties of Arsenic Ions

Abstract

A new synthesis method of hybrid Fe3O4/C/TiO2 structures was developed using microwave-assisted coprecipitation. The aim of the study was to examine the effect of the addition of glucose and titanium dioxide on adsorptive properties enabling removal of arsenic ions from the solution. The study involved the synthesis of pure magnetite, magnetite modified with glucose and magnetite modified with glucose and titanium dioxide in magnetite: glucose: titanium dioxide molar ratio 1:0.2:3. Materials were characterized by XRD, FT-IR, and BET methods. Magnetite and titanium dioxide nanoparticles were below 20 nm in size in obtained structures. The specific surface area of pure magnetite was approximately 79 m2/g while that of magnetite modified with titanium dioxide was above 190 m2/g. Obtained materials were examined as adsorbents used for removal As(V) ions from aqueous solutions. Adsorption of arsenic ions by pure magnetite and magnetite modified with titanium dioxide was very high, above 90% (initial concentration 10 mg/L), pH in the range from 2 to 7. The preparation of magnetic adsorbents with a high adsorption capacity of As(V) ions was developed (in the range from 19.34 to 11.83 mg/g). Magnetic properties enable the easy separation of an adsorbent from a solution, following adsorption.

Ball-milled magnetite for efficient arsenic decontamination: Insights into oxidation–adsorption mechanism

“…Among them, the synthesized magnetite nanoparticles (MNPs) have high As affinity and are magnetically separable. Wojciechowska and Lendzion-Bieluń (2020) confirmed that MNPs prepared by co-precipitation method has a small size and a large specific surface area, and the dose of 2.5 g•L -1 achieved the adsorption degree of 97-99% (initial concentration of As(V): 10 mg•L -1 at pH=7). Partial substitution of MNPs with natural magnetite can avoid the indispensable harmful chemicals used in the synthesis, create mutual benefit in green-adsorbent development and market requirement.…”

Optimization of Ciprofloxacin Adsorption on Clinoptilolite-Based Adsorbents Using Response Surface Methodology

“…Furthermore, the synergetic effect of both iron oxide nanoparticles and GO led to an increase in CLI S BET three times. This increase could be ascribed to the large surface area of the coated materials (MAG~80 m 2 g −1 ; GO~400 m 2 g −1 ) [ 54 , 55 ]. The same trend was observed for the V tot .…”

TiO2-Modified Magnetic Nanoparticles (Fe3O4) with Antibacterial Properties

“…Figure 2 shows the pore size distribution of pure magnetite (Fe 3 O 4 ) and magnetite modified with titanium dioxide in different molar ratios (Fe 3 O 4 /C/TiO 2 ). Nanocrystalline magnetite is a mesoporous material, with a pore size in the range of 5–15 nm [ 12 ]. The modification with titanium dioxide caused the pore size to decrease.…”

“…A full-pattern fit based on the Rietveld refinement was used to calculate the weight fractions of the identified crystallographic phases. The Scherrer equation was used to determine the size of magnetite and anatase crystallites [ 11 , 12 , 13 ]: where D is the crystallite size, k is the dimensionless shape factor, is the X-ray wavelength, is the line broadening at half maximum intensity, and is the Bragg angle.…”

“…A fullpattern fit based on the Rietveld refinement was used to calculate the weight fractions of the identified crystallographic phases. The Scherrer equation was used to determine the size of magnetite and anatase crystallites [11][12][13]:…”