Biocomposites of polypyrrole, polyaniline and sodium alginate with cellulosic biomass: Adsorption-desorption, kinetics and thermodynamic studies for the removal of 2,4-dichlorophenol

• Published in: International journal of biological macromolecules 2020-06, Vol.153, p.146-157
• Main Authors: Bhatti, Haq Nawaz, Mahmood, Zofishan, Kausar, Abida, Yakout, Sobhy M., Shair, Omar H., Iqbal, Munawar
• Format: Article
• Language: English
• Subjects: 2,4-dichlorophenol; Adsorption-desorption; Alginates - chemistry; Aniline Compounds - chemistry; Biocomposites; Biomass; Biopolymers; Cellulose - chemistry; Chlorophenols - chemistry; Chlorophenols - isolation & purification; Kinetics; Polymers - chemistry; Pyrroles - chemistry; Thermodynamics; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - isolation & purification; Water Purification
• ISSN: 0141-8130; 1879-0003
• DOI: 10.1016/j.ijbiomac.2020.02.306

The biocomposites of polypyrrole (PPY), polyaniline (PANI) and sodium alginate (NaAlg) with cellulosic biomass barley husk (BH) were prepared and employed for the removal of 2,4-dichlorophenol (2,4-DCP) form aqueous media. The sorption of 2,4-DCP was studied using native and biocomposites (PPY/BH, PANI/BH and NaAlg/BH) as function of various process variables. The maximum sorption (qe, 7.55–24.57 mg/g) of 2,4-DCP was achieved in the range of 7–10 pH, 0.05 g composite dose, 25 mg/L initial concentration of 2,4-DCP and 120 min contact time at 30 °C. The FTIR analysis revealed the involvement of amino, hydroxyl and carboxylic groups for the binding of 2,4-DCP on the surface of biocomposites. The Freundlich and pseudo second order kinetics models best explained the 2,4-DCP adsorption on to the biocomposites. The ∆G, ∆H and ∆S parameters were also computed, which revealed the favorable and exothermic adsorption nature of 2,4-DCP. Presence of salts affected the 2,4-DCP adsorption negatively. HCl found to be efficient desorbing agent for 2,4-DCP from composites and up to 65.12% was eluted using 0.5 N solution. In view of promising efficiency, the biocomposites have potential to remove 2,4-DCP form industrial effluents. [Display omitted] •Biocomposites of polypyrole, polyaniline and sodium alginate with cellulosic biomass were prepared.•Adsorption, kinetics and thermodynamic studies were performed for the removal of 2,4-DCP.•Process variables were optimized along with characterization of biocomposites.•Biocomposites showed promising efficiency and have potential to remove 2,4-DCP from effluents.