Batch and column studies using doped polymer for elimination of Sodium 4-[4-(dimethylamino) phenyl] diazenyl benzene-1-sulfonate from wastewater

ABSTRACT

In the present research Polyaniline (PANI) has been prepared by chemical polymerisation using oxalic acid (OA) as a dopant. Removal of Methyl Orange (MO), (Sodium 4-{[4-(dimethylamino) phenyl] diazenyl} benzene-1-sulphonate), from wastewater, has been carried out using Oxalic acid (OA) doped Polyaniline. Breakthrough curves have been obtained from column adsorption experiments. Maximum dye adsorption was witnessed at pH 3. Four isotherm models were studied for the adsorption data and the subsequent constants have been calculated. The mean adsorption energy estimated from the D-R isotherm model has been determined as 1.5 × 10⁴ J mol⁻¹. Thermodynamic investigations intimated the spontaneity as well as endothermicity, with an entropy change of (79 J mol⁻¹ K⁻¹). Kinetic experiments divulged the adsorption of the dye by a second-order mechanism. The film diffusion mechanism was predominating at all studied temperatures. The percentage saturation for PANI column is 99.98% with the adsorption capacity of adsorbent as 8.36 mg/g. The recovery of dye has been accomplished by 0.1 N NaOH through the exhausted column. Results demonstrated PANI to be an excellent adsorbent for the eradication of the hazardous dye from textile wastewater.

KEYWORDS:

• Adsorption
• azo dye
• breakthrough curve
• isotherm
• textile wastewater

Disclosure statement

The authors declare no conflict of interest.