ZnO, CuO and Fe₂O₃ green synthesis for the adsorptive removal of direct golden yellow dye adsorption: kinetics, equilibrium and thermodynamics studies

Abstract

In the present investigation, ZnO, CuO and Fe2O3 were prepared via green route and utilized for the sequestration of DGY (Direct Golden Yellow) dye. Affecting variables i.e., temperature, contact time, adsorbent dose and pH were optimized for maximum sequestration of dye from aqueous medium. The pH 2, adsorbent dose 0.1 g/50 mL dye solution, temperature 30 °C and 50 mg/L dye initial concentration were best levels for efficient dye adsorption and equilibrium was attained in 30 min reaction time. The dye sequestration on to ZnO, CuO and Fe2O3 was an exothermic process. Freundlich and Temkin adsorption isotherms explained well the dye adsorption onto nanoadsorbents and dye adsorption followed pseudo first order kinetic model. Effect of electrolytes and heavy metal ions was also investigated and both affected the adsorption process significantly. In the presences of surfactant/detergent, the removal of dye was reduced and 0.5 N NaOH efficiently desorbed the dye from nanoadsorbents. Findings depicted that the nanoadsorbents are effectual for the sequestration of DGY dye, which can be employed for the remediation of textile effluents.

Comparative Reactive Blue 4 Dye Removal by Lemon Peel Bead Doping with Iron(III) Oxide-Hydroxide and Zinc Oxide

“…Moreover, the study of Praipipat et al found that the chicken and duck eggshell beads modified with iron­(III) oxide-hydroxide also presented higher RB4 dye removal than the addition of zinc oxide into the same raw materials . In addition, other studies also reported that the addition of iron oxide or magnetite (Fe 3 O 4 ) in carboxymethyl cellulose helped in the increase of the dye removal efficiency. , Furthermore, the study of Noreen et al also supported that the addition of Fe 2 O 3 into the extracted Cassia Fistula gave a higher direct golden yellow removal than ZnO and CuO . Therefore, LBF was a potential adsorbent material for dye removal and could be used as an alternative adsorbent for wastewater treatment in the future.…”

“…25,26 Furthermore, the study of Noreen et al also supported that the addition of Fe 2 O 3 into the extracted Cassia Fistula gave a higher direct golden yellow removal than ZnO and CuO. 27 Therefore, LBF was a potential adsorbent material for dye removal and could be used as an alternative adsorbent for wastewater treatment in the future.…”

Synthesis of ZnxNi1-xFe2O4, MnxNi1-xFe2O4, MgxNi1-xFe2O4, CuxNi1-xFe2O4 and CaxNi1-xFe2O4 via co-precipitation method and their application for treatment of textile wastewater

“…The rationale behind this reduction in the adsorption efficiency is that the rise in temperature usually weakens the adsorptive forces present among the dye molecules and the active locations present on the adsorbent exterior which ultimately reduces the efficiency of adsorption (Salleh, Mahmoud, Karim and Idris, 2011). Noreen et al (2020) studied the temperature's influence over the efficiency of adsorption of various dyes by employing the oxides of Mg, Zn and Fe. It was examined that with the temperature increment to 40 °C, the optimum adsorption was deduced as 40.94 mg g -1 for oxides of Mg, 46.25 mg g -1 for oxides of Zn and 42.86 mg g -1 for oxides of Fe.…”

“…At lower temperatures, the rigorous movement in the molecules of dye resulted in an increase in the effectiveness of adsorption. While, at higher temperatures, the decline in the efficiency of adsorption got reported because of the damaging/inactivity of active binding sites over the adsorbent exterior surface (Noreen, et al, 2020).…”

Photovoltaic Properties of ZnO Films Co-Doped with Mn and La to Enhance Solar Cell Efficiency

“…ZnO nanoparticles are important host material for La ions, because they are a well-known material for providing luminescence in doped particles. Therefore, co-doping ZnO with Mn and La could overcome the above-mentioned drawbacks and enhance the cell efficiency [ 24 , 25 ].…”