Adsorption Mechanism and Electrochemical Characteristic of Methyl Blue onto Calcium Ferrite Nanosheets

Abstract

A rapid combustion process was applied to prepare CaFe2O4 nanomaterials using CaBr2·xH2O and Fe(NO3)3·9H2O as raw materials and CaFe2O4 nanomaterials were characterized by SEM, TEM, VSM, XRD, and FTIR techniques. The results showed that the prepared nanomaterials had a sheet-like structure, and for larger adsorption capacity of dyes, CaFe2O4 nanosheets prepared at 700°C for 2 h with average grain size was 93.3 nm, a thickness of 8.4 nm, and the saturation magnetization of 8.15 emu/g were employed as adsorbate for the removal of methyl blue (MB). The adsorption performance of MB onto CaFe2O4 nanosheets was investigated; CaFe2O4 nanosheets displayed favorable adsorption capacity, and the adsorption conformed to the pseudo-second-order model and the Freundlich model, which demonstrated that the adsorption process of MB on CaFe2O4 nanosheets belonged to multilayer chemisorption process. When the pH value reached 3, the adsorption capacity of MB by CaFe2O4 nanosheets kept maximum value of 478.07 mg/g; and after 5 regenerations, the removal efficiency of MB was reduced to 59.06% of the first time. The electrochemical behavior of MB onto the nanosheets was evaluated through CV in conjunction with EIS. The CaFe2O4 nanosheets revealed a promising prospect for the adsorption of dyes.

Adsorptive Removal of Alizarin Red S onto Sulfuric Acid-Modified Avocado Seeds: Kinetics, Equilibrium, and Thermodynamic Studies

“…Due to its stability, easy to synthesize, and color varieties, it is used particularly in textile industries [6]. The color in the water affects the aquatic system, damages the water bodies, collapses the entire food chain which is very toxic, and creates harmful effects to the human beings like carcinogenic and mutagenic effects [7][8][9]. Alizarin red S (ARS) is among the highest-risk dyes available, and it is widely employed as a coloring agent in a range of industries, including textile, cosmetics, and many others.…”

Highly efficient removal of methylene blue from aqueous solution by magnetic biochar prepared from hawthorn seeds

“…7 The adsorption process is highly efficient for the removal of dyestuff from wastewater in terms of its low cost, ease of operation, and insensitivity to toxic substances in comparison with the other used processes. There are different types of adsorbents such as biomass, 8 nanoparticles, [9][10][11][12][13][14] polyvinyl alcohol, 15 active carbon [16][17][18] and clay material 5 to remove dyestuffs from the environment. Biochar is one of the most commonly used carbon-rich material in different studies due to its high surface area.…”