Abstract
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.
Highlights
The pollution due to dyes has increased many folds in recent decade, public health and environment pollution is emerged as a one of major issues worldwide
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
Findings depicted that the nanoadsorbents are effectual for the sequestration of Direct Golden Yellow (DGY) dye, which can be employed for the remediation of textile effluents
Summary
The pollution due to dyes has increased many folds in recent decade, public health and environment pollution is emerged as a one of major issues worldwide. Several types of nanomaterial have been prepared via green techniques, which involved the fabrication of nanoadsorbents using plant extracts. The nanoadsorbents have been prepared via green routes since plant produce primary and secondary metabolites as bioactive agents [32, 46,47,48,49,50,51] and this nanoadsorbents prepared are used successfully for the removal of pollutant from wastewater (Table 1), which shows the nanocomposites and their applications for the removal of different types of pollutants from wastewater [6, 52,53,54]. Three types of nanoadsorbent were synthesized (ZnO, CuO and Fe2O3) via green route and their adsorption efficiencies were evaluated for Direct Golden Yellow (DGY) dye (Figure 1).
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