Microscopic Characterization of Material Nanocomposite-Dye Complexes

Rajendrakumar Anayath1, Ashok K. Sharma11, Vilko Žiljak2

1 Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Sonipat
2 Faculty of Graphic Arts, University of Zagreb, Croatia

Abstract

Micro and nano-structural characterizations are among the most entrancing and helpful properties as particles exist in number of morphologies depending upon the synthesis procedures. Microscopic description of nanomaterials provides information regarding the morphology of different phases, chemical composition and crystallographic defects. Various applications of nanomaterials can be finely tuned based on its morphology. A comprehensive study toward the synthesis of green and facile silver doped MnO2 nanocomposite (Ag-MnO2) has been carried out. The Ag-MnO2 nanocomposite was synthesized using co-precipitation technique. The optical, structural, and microscopic properties were analyzed by using UV–Visible spectroscopy, X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy  (TEM) and Elemental mapping. The fabricated nanocomposite was utilized for the removal of toxic Fast Yellow AB dye from the waste water by using ultrasonic assisted adsorption process. Effect of sono-adsorption activity of Ag-MnO2 nanocomposite on dye has been visualized by analyzing the change in absorbance of dye under UV-spectrophotometer. The removal of the organic dyes has been calculated by monitoring the decrease in concentration of the dye w.r.t original concentration of dye. The effects of operating parameters such as adsorbent dosage, pH and dye initial concentration have also been investigated. The enhanced removal capacity of Ag-MnO2 nanocomposite in the presence of ultrasonic irradiations than in the presence of UV–visible irradiation has also been discussed. The ultrasonic assisted adsorption of the dye follows pseudo-second order kinetics. The rate constants for both sonocatalysis and photocatalysis have successfully established and reusability tests have also been done to ensure the stability of the used composites. Rate constant for sono-adsorption is very high as compared to photocatalysis.


*Corresponding author email ID: profanayath@gmail.com