Mixed Phase Crystalline Hausmannite and Manganese Ferrite Nanoparticles with Magnetic Properties for Environmental Application

Ultrasound‐assisted enhanced and rapid uptake of anionic dyes from the binary system onto MnFe2O4/polyaniline nanocomposite at neutral pH

“…The obtained brownish-black solid product was ground manually to fabricate manganese ferrite (MnF) nanoparticles. [25] To prepare the MnF-PANI composite, a solution was prepared by adding 5.0 ml of distilled aniline monomer to 150 ml of 1.0 M HCl solution. Next, another solution was prepared by dissolving 12.25 g of APS in 150 ml of DI water and then both the solutions were sonicated separately for 5 min.…”

“…The effect of ultrasonication time on the removal efficiency of MR and CR dye from the binary system was studied by varying the sonication time from 1 to 15 min at different initial MR (15,20,25, and 30 mg/L) and CR (12,16,20, and 28 mg/L) dye concentrations, and the results are shown in Figure 5c,d. It can be seen that for both MR and CR dyes the equilibrium condition was achieved within 6 min of reaction time, and the observed MR and CR dye removal efficiencies were in the range F I G U R E 5 Effect of (a) MnF-PANI-NC dose (g/L) and (b) initial MR and CR dye concentrations (mg/L) on removal efficiency, and the effect of ultrasonication time (min) on removal efficiency of (c) MR dye and (d) CR dye ~94-98%.…”

“…Pseudo-first-order, pseudo-second-order, and intra-particle diffusion kinetic model parameters for MR dye adsorption onto MnF-PANI-NC from the binary dye solution (MnF-PANI-NC dose was 0. 25 Tables 1 and 2. In the intra-particle diffusion model fitting, if the constant c value becomes zero, then pore diffusion is considered to be the sole ratelimiting step, but if c 6 ¼ 0, then it indicates the participation of both pore diffusion and boundary layer diffusion.…”

Green Synthesis, Characterization and Magnetic Properties of Hausmannite Nanoparticles

“…It belongs to the spinel group and forms tetragonal crystals. The wide range of technological applications of Mn 3 O 4 depends on its advantages as reported in [8][9][10][11][12][13][14][15][16][17]: (i) it is one of the most stable oxides of manganese. (ii) It is active catalyst for various catalytic reactions such as the decomposition of NO x , drinking water treatment process and the oxidation of both C 6 H 6 and CO 2 .…”

“…(v) The separate application of hausmannite nanoparticle is reported for dye remediation by adsorption or photocatalytic degradation. Hausmannite nanoparticles have been synthesized by various methods [12][13][14][15][16][17][18][19][20][21][22][23]. Overall, the synthesis mechanism of Mn 3 O 4 can be divided into two main categories.…”