Preparation and characterization of nano- Fe(OH)₃, its composites with two natural zeolites, and granulation of them for nitrate removal from polluted water

Abstract

The development of a cost-efficient, highly effective, and granular shape adsorbent is highly desired for nitrate removal. In this study, two different Fe(OH)3 nanoparticles with amorphous and crystalline structures, and nanocomposites were successfully synthesized using the ultrasonic-assisted co-precipitation. Both nanoparticles were scrutinized using FTIR, SEM, and XRD. Crystallized Fe(OH)3/zeolite nanocomposites were not efficient for nitrate removal;hence, the rest of the study was carried out with amorphous Fe(OH)3 nanoparticles (Am-Fe(OH)3). Clinoptilolite and analcime were acid-washed and used as a support for synthesized Am-Fe(OH)3 nanoparticles. Nanocomposites of clinoptilolite and analcime were abbreviated as Fe(OH)3/Clin and Fe(OH)3/Anc, respectively. The nanocomposites were characterized by BET, FTIR, SEM, EDS, and XRD techniques. Subsequently, granules of the above-mentioned nanocomposites were prepared using the wet gelation method and alginate. Two crucial features of pH and adsorbent:alginate ratio, were assessed and optimized as 11-12 and 1:3, respectively. The performance of granules were investigated regarding pH, time, and adsorbent dosage. Fe(OH)3/Clin and Fe(OH)3/Anc granules removed 96.82% and 34.02% of nitrate from a contaminated solution with initial concertation of 50mg/L. Overall, Fe(OH)3/Clin granule was an effective adsorbent for nitrate removal. The maximum adsorption capacity of Fe(OH)3/Anc and Fe(OH)3/Clin were 0.4443 mg/g and 5.6211 mg/g for 0.2 g of each adsorbent, respectively. Both adsorbents displayed good compatibility with the pseudo-second-order kinetic model.

Flower‐like Fe(OH)3 as Sulfur Hosts for High‐Performance Lithium–Sulfur Batteries

“…The XRD patterns of elemental sulfur, flower‐like Fe(OH) 3 and S@FH composites are plotted in Figure 2a. In this XRD pattern, Fe(OH) 3 does not exhibit any crystal peaks, indicating that the synthesised flower‐like Fe(OH) 3 sample is amorphous [36,37] . After sulfur impregnation, all diffraction peaks of the S@FH composites align with the diffraction peaks of elemental sulfur (PDF#08‐0247), indicating that sulfur has been successfully incorporated into Fe(OH) 3 through the melt‐diffusion method.…”

Investigation of the Release Rate of Biocide and Corrosion Resistance of Vinyl-, Acrylic-, and Epoxy-Based Antifouling Paints on Steel in Marine Infrastructures

“…Furthermore, biocides can undergo bioaccumulation, where they accumulate in the tissues of organisms at higher trophic levels. This bioaccumulation can magnify toxic effects, potentially disrupting entire food chains and ecological balances [94][95][96].…”

Optimizing nanofluid additives for enhanced thermophysical properties in anionic crude oil for EOR applications

“…[2][3][4][5] Amid these developments and due to expensive costs, the incorporation of additives, such as nanoparticles, has emerged as a potential enhancement within the EOR process. Nanoparticles within nanosuspensions typically range in size from 1 to 100 nm, and this small size amplifies their effective surface area and notable surfacearea-to-volume ratio, [6][7][8][9][10][11][12] impacting fluid properties like heat transfer, viscosity, [13] and particle activity on surfaces. [14,15] Moreover, nanoparticles possess unique physicochemical and mechanical properties and exhibit resilience against degradation, [16][17][18][19][20][21][22] especially in oil and gas reservoirs characterized by high salinity and temperature.…”