UFAS1 PLATFORM EVENTS, International Conference on Materials Science ICMS2018

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Synthesis, characterization of polyaniline and its application for adsorption of salicylic acid
sousna sahnoun

Last modified: 2018-07-25

Abstract


Polyaniline (PANI) is one of the most interesting polymers because of its easy preparation, high electrical conductivity, environmental stability, a wide range of applications in plastic batteries and more recently for adsorption removal of pollutants.

In this study, polyaniline material was synthesized by in situ chemical polymerization method using ammonium peroxydisulfate (APS) as an oxidant, and characterized by SEM, XRD, FTIR, and TGA techniques. The synthesized PANI has been utilized as the adsorbent for the removal of salicylic acid (SA) from aqueous solution by the adsorption technique.

The SEM of PANI shows aggregated particles with no uniform size. The XRD shows the peaks at 2θ= 9.1, 15.7, 20.7 and 25.3 which are characteristic of PANI [1]. The FTIR spectrum of PANI shows the presence of characteristic absorption bands at 1555 cm-1 (C=C stretching vibration of the quinoid ring), 1476 cm-1 (stretching vibration of C=C of the benzenoid ring) and 1288 cm-1 (C-N stretching vibration) [2]. The DTA curve for the PANI shows three weight losses at 105C, 286C and 520C corresponding on the TGA curves to three step decompositions. The first step of 9% ranging from room temperature to approximately 140C corresponds to the loss of physisorbed and interlayer water. The second weight loss of 11% corresponds to the removal of dopant molecule and oligomer [3], whereas the third mass loss of about 30% is attributed to the thermal decomposition and degradation of the PANI chains.

The maximum experimental adsorption capacity of adsorption of salicylic acid (SA) was 393,5 mg/g. Attempts were made to fit the isothermal data using Langmuir and Freundlich equations. The experimental results have demonstrated that the equilibrium data is fitted well by a Freundlich isotherm equation. These results show that the prepared PANI is excellent adsorbent in the removal SA from aqueous solutions.