Abstract
Zinc molybdate (ZnMoO4) was prepared by thermal decomposition of an oxalate complex under a controlled temperature of 500 °C. Analyses of the oxalate complex were carried out using Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). On the other hand, analyses of the synthesized zinc molybdate were carried out by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Brunauer-Emmett-Teller technique (BET). The efficiency of the synthesized catalyst was tested with the reduction reaction of 3-nitrophenol (3-NP), and was also applied as a sorbent for methylene blue dye (MB) in aqueous solutions. The catalytic test of zinc molybdate shows a very high activity. The concentration reduction progress and adsorption of the dye were followed by an ultraviolet-visible (UV-vis) spectrophotometer.
Highlights
Zinc molybdate is among the most studied ternary oxides in the family AMoO4 (A is a transition element or a divalent metal from the alkaline earth column)
Where qe is the amount of the methylene blue dye (MB) dye adsorbed at equilibrium by the synthesized zinc molybdate nanoparticle, C0 is the initial dye concentration, Ce is the dye concentration at equilibrium; W is the mass of the adsorbent (g), and V is the volume of the solution (L)
Brunauer-Emmett-Teller (BET) method [51] was used to find out the specific surface area of the synthesized zinc molybdate, ZnMoO4
Summary
Zinc molybdate is among the most studied ternary oxides in the family AMoO4 (A is a transition element or a divalent metal from the alkaline earth column). There is no investigation reported on the use of zinc molybdate as catalyst in the reduction of nitrophenol to aminophenol, and neither in dye removal from polluted industrial waters. Molecules 2018, 23, 1462 having the same or better efficiency in dye removal by adsorption from polluted industrial waters and using low-cost materials. Research on de-colorization was focused, for example, on the use of metals oxides [34,35] or composite materials [36,37,38] In this contribution, we report the synthesis of the α-ZnMoO4 nanomaterial using a different method that uses precursors, such as oxalate complexes of zinc and molybdenum.
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