Adsorption Behavior of Crystal Violet Dye on to Tin (IV) Molybdovanadate Cation Exchanger from Aqueous Solution

Abstract

A newly synthesized tin(IV) molybdovanadate, a hetero poly acid based cation exchanger was
characterized on the basis of FT-IR, XRD, TGA and SEM. The structural studies revealed semi-crystalline nature
of the material. The ion exchange capacity, chemical stability, and effect of temperature on ion exchange
capacity were carried out to understand the ion exchange capability. Distribution studies showed that the
selectivity of the exchanger towards various metal ions was in the order PbII > CuII > CdII > CoII > ZnII > BiIII >
NiII > MnII > AlIII > MgII > HgII. The UV-Visible spectrophotometric studies revealed the enhanced adsorption
ability of this material towards organic pollutants like dyes. Exchanger can be used for the removal of crystal
violet dye from aqueous solution. The effect of some important parameters such as initial concentration of dye,
adsorbent dosage, and contact time on the uptake of organic dye from aqueous solution was also investigated.
Freundlich and Langmuir isotherm models were applied to the equilibrium data. It was observed that adsorbent
showed higher adsorption capacity for crystal violet (1.7 mg g^-1). The adsorption of dye was best described by
pseudo second order mechanism. Waste water from textile industries were selected for checking the validity of
this material.