Effective Removal of Azo Dye Reactive Blue 222 from Aqueous Solutions Using Modified Magnetic Nanoparticles with Sodium Alginate/Hydrogen Peroxide

Abstract

The present work aimed to study the removal efficiency of Reactive Blue 222 (RB222) from aqueous solutions by applying a combined process with magnetic sodium alginate beads/H2O2. The effect of various operating parameters including sodium alginate dosage, H2O2 concentration, pH, and dye concentration on the efficiency of the process was investigated. The Freundlich and Langmuir isotherms were used to explain the adsorption process. Adsorption kinetics of RB222 with magnetic sodium alginate beads were also investigated using the pseudo‐first‐, second‐order, and intra‐particle diffusion kinetic models. Optimum conditions for dye removal were determined at [dye concentration] = 50 mg/L, [H2O2] = 250 mg/L, and [pH] = 3 with a reaction time of 180 min. Dye removal percentages obtained in this research were 54.51% and 90.39% using magnetic sodium alginate and magnetic sodium alginate/H2O2 processes, respectively. SEM and XRD were used for the characterization of the obtained magnetic sodium alginate beads. It was revealed that the adsorption of the dye in sodium alginate beads was more consistent with the Freundlich model (R2 = 0.9934) compared to that of the Langmuir model (R2 = 0.7457). Also, the results demonstrated that the adsorption of RB222 in magnetic alginate beads was consistent with the pseudo‐second‐order kinetic models (R2 = 0.9854). © 2018 American Institute of Chemical Engineers Environ Prog, 38: S205–S213, 2019

Process Optimization and Modeling of Methylene Blue Adsorption Using Zero-Valent Iron Nanoparticles Synthesized from Sweet Lime Pulp

“…However, an increase in C 0 resulted in a decrease in removal concentration. Upon increasing dye concentration, the adsorption site became saturated, which limited the removal of MB [36]. As a result, q t increased from 8.20 ± 0.01 to 32.6 ± 0.02 mg/g with a rise in C 0 from 10 mg/L to 40 mg/L.…”

Use of sodium alginate biopolymer as an extracting agent of methylene blue in the polymer‐enhanced ultrafiltration technique

“…It is posited that the adsorption efficiency is strongly influenced by the structural functional groups of SA that capture cationic species, namely, COO − and OH − , for removal from the solution according to studies of PEUF with assistance from SA for the retention of metals such as Fe(III) 48 and of AA as a WSP for the retention of Cu(II), Fe(III), 49 Ag(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Pb(II). 50 Since SA is an effective adsorbent, it has been used for the retention of dyes, such as, reactive blue 222 (RB222), 51 MB 52 and malachite green (MG), 40 via solid-liquid separation. [51][52][53] It has also been used in combination with other materials to remove general dyes and/or MB.…”

“…50 Since SA is an effective adsorbent, it has been used for the retention of dyes, such as, reactive blue 222 (RB222), 51 MB 52 and malachite green (MG), 40 via solid-liquid separation. [51][52][53] It has also been used in combination with other materials to remove general dyes and/or MB. [54][55][56][57][58][59] However, according to the literature, SA has not been used as a WSP to remove MB through PEUF.…”

Iron modified zeolite carrier for efficiently pharmaceutical pollutant degradation in heterogeneous electro‐Fenton: Influence factors and kinetic

“…AOPs are based on the production of hydroxyl radicals (˙OH) that is the strongest after fluorine oxidant. These radicals are highly reactive, unstable, and short lifetime (less than nanoseconds) 3,4 . The electro‐Fenton (EF) process is the combination of Fenton and electrochemical processes to achieve the high efficiency 5,6 .…”

“…These radicals are highly reactive, unstable, and short lifetime (less than nanoseconds). 3,4 The electro-Fenton (EF) process is the combination of Fenton and electrochemical processes to achieve the high efficiency. 5,6 In this process, the reduction of oxygen forms H 2 O 2 , producing˙OH in the presence of Fe 2+ .…”