Adsorptive Features of Magnetic Activated Carbons Prepared by a One-Step Process towards Brilliant Blue Dye

Abstract

Water pollution by dyes has been a major environmental problem to be tackled, and magnetic adsorbents appear as promising alternatives to solve it. Herein, magnetic activated carbons were prepared by the single−step method from Sapelli wood sawdust, properly characterized, and applied as adsorbents for brilliant blue dye removal. In particular, two magnetic activated carbons, MAC1105 and MAC111, were prepared using the proportion of biomass KOH of 1:1 and varying the proportion of NiCl2 of 0.5 and 1. The characterization results demonstrated that the different proportions of NiCl2 mainly influenced the textural characteristics of the adsorbents. An increase in the surface area from 260.0 to 331.5 m2 g−1 and in the total pore volume from 0.075 to 0.095 cm3 g−1 was observed with the weight ratio of NiCl2. Both adsorbents exhibit ferromagnetic properties and the presence of nanostructured Ni particles. The different properties of the materials influenced the adsorption kinetics and equilibrium of brilliant blue dye. MAC111 showed faster kinetics, reaching the equilibrium in around 10 min, while for MAC1105, it took 60 min for the equilibrium to be reached. In addition, based on the Sips isotherm, the maximum adsorption capacity was 98.12 mg g−1 for MAC111, while for MAC1105, it was 60.73 mg g−1. Furthermore, MAC111 presented the potential to be reused in more adsorption cycles than MAC1105, and the use of the adsorbents in the treatment of a simulated effluent exhibited high effectiveness, with removal efficiencies of up to 90%.

Successful removal of fluoride from aqueous environment using Al(OH)3@AC: column studies and breakthrough curve modeling

“…The adsorption process explained that the surface functionality is reduced due to its low chemical stability, resulting in the leaching of material, waste and associated costs. 22,23 Herein, the adsorption capacity of activated carbon is determined by the modication strategy, aiming to optimize the surface properties and thus the adsorptive character. 24 Recently, industries have tried to apply inorganic adsorbents to adsorb uoride.…”

Removal of Brilliant Green Cationic Dye Using Bioadsorbent Material from Oyster Shells

“…Likewise, many bioadsorbents have been implemented, from which good results have been obtained in the removal of dyes and other contaminants [10,17]. An example of these materials is the oyster shell, which represents an environmental problem as it is a waste generated in large quantities by the fishing and food industries, leading to its accumulation and generation of bad odors [18][19][20][21].…”