Single-stage solution combustion preparation of ZnFe2O4-ZnS nanoparticles as dye adsorbent: Effect of fuel to oxidant and Zn to Fe molar ratios

Document Type : Research Article


1 Department of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran

2 Department of Materials Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran


ZnFe2O4-ZnS adsorbent was synthesized by the single-stage solution combustion procedure applying the thiourea at different fuel to oxidant ratios (ϕ = 1, 1.2, 1.4, and 1.6), and different Zn to Fe molar ratios (Zn : Fe = 0.5, 0.6, 0.7, and 0.8). The efficiency of the removal of methyl orange dye by synthesized powders in various conditions was investigated. The best sample, in terms of dye removal, was the synthesized powder at Zn : Fe = 0.6 and ϕ = 1.4. Dye removal was discovered to be extremely pH-dependent. The highest dye removal was observed to be about 94% of methyl orange, which disappears after 20 min in a dark environment. Kinetics investigations were carried out to discover the mechanism of methyl orange elimination and its adsorption rate kinetics. It was found that the elimination of methyl orange by ZnFe2O4-ZnS powders follows a pseudo second-order adsorption kinetics model.

Graphical Abstract

Single-stage solution combustion preparation of ZnFe2O4-ZnS nanoparticles as dye adsorbent: Effect of fuel to oxidant and Zn to Fe molar ratios


  • ZnFe2O4-ZnS powders were synthesized by single stage solution combustion procedure.
  • Fuel / oxidant and Zn/Fe molar ratios as synthesizing parameters were investigated.
  • The kinetics of methyl orange removal using ZnFe2O4-ZnS adsorbent was investigated.
  • The methyl orange removal (dye) by ZnFe2O4-ZnS is highly pH-dependent.
  • The removal of dye by ZnFe2O4-ZnS follows a pseudo second-order kinetics model.


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