Removal of Colored Organic Pollutants from Wastewaters by Magnetite/Carbon Nanocomposites: Single and Binary Systems

Abstract

This work develops a methodology for selective removal of industrial dyes from wastewaters using adsorption technology based on magnetic adsorbents. The magnetic nanoparticles embedded within a matrix of activated carbon were tested as adsorbents for removal of industrial dyes from aqueous solutions. The effects of four independent variables, solution pH, initial concentration of pollutant, adsorbent dose, contact time, and their interactions on the adsorption capacity of the nanocomposite were investigated in order to optimize the process. The removal efficiency of pollutants depends on solution pH and increases with increasing the carbon content, with initial concentration of the pollutants, the temperature, and the dose of magnetite/carbon nanocomposites. Pseudo-second-order kinetic model was fitted to the kinetic data, and adsorption isotherm analysis and thermodynamics were used to elucidate the adsorption mechanism. The maximum adsorption capacities were 223.82 mg g −1 for Nylosan Blue, 114.68 mg g −1for Chromazurol S, and 286.91 mg g −1 for Basic Red 2. The regeneration and reuse of the sorbent were evaluated in seven adsorption/desorption cycles. The optimum conditions obtained for individual adsorption were selected as starting conditions for simultaneous adsorption of dyes. In binary systems, in normal conditions, selectivity decreases in the order: Red Basic 2 > Nylosan Blue > Chromazurol S.

Phosphonate metal–organic frameworks used as dye removal materials from wastewaters

“…The positive values of Δ S 0 reflect an increase in randomness at the solid–solution interface during the adsorption of the dyes on CoVP. [ 61 ]…”

Polypyrrole-Chitosan-CaFe2O4 Layer Sensor for Detection of Anionic and Cationic Dye Using Surface Plasmon Resonance

“…They have a large surface area, high magnetic properties, and a high adsorption rate and efficiency [22,23]. Magnetite (Fe 3 O 4 ) nanoparticles [23], ferrite (Fe 2 O 3 ) nanoparticles [24], magnetite/carbon nanocomposite iron nanoparticles [25], and cobalt-zinc ferrite nanoadsorbents [26] were used to remove and purify the wastewater. Kinetic studies of them for dye adsorption fit the second-order kinetic model and Langmuir isotherm [23,25] well.…”

“…Magnetite (Fe 3 O 4 ) nanoparticles [23], ferrite (Fe 2 O 3 ) nanoparticles [24], magnetite/carbon nanocomposite iron nanoparticles [25], and cobalt-zinc ferrite nanoadsorbents [26] were used to remove and purify the wastewater. Kinetic studies of them for dye adsorption fit the second-order kinetic model and Langmuir isotherm [23,25] well. Hence, the application of magnetic nanoparticles is a connivance method for detecting and degrading pollution in an environmental area.…”

Optimization and Modelling of Turbidity Removal of Sewage using High-Gradient Magnetic Separation (HGMS) by Response Surface Methodology (RSM)

“…& Technol. 28 (4): 1367 -1387 (2020) pharmaceutical research (Ueda et al, 2009;He et al, 2014), biotechnology application (Setchell, 1985;Hoffmann et al, 2002), water and wastewater (Karapinar, 2003;Tomska & Wolny, 2008;Hwang & Han, 2015), dye removal (Chen et al, 2011;Narian et al, 2015;Muntean et al, 2018), biological enhancement process (Bitton et al, 1975;Sirisha et al, 2017), and reduction of extracellular protein (Franzreb et al, 2006;Käppler et al, 2009).…”