Polyaniline@porous polypropylene for efficient separation of acid by diffusion dialysis

• Published in: Separation and purification technology Vol. 233; p. 115989
• Main Authors: Prajapati, Pradeep K., Reddy, Naresh N., Nimiwal, Raghavendra, Singh, Puyam S., Adimurthy, S., Nagarale, Rajaram K.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-02-2020
• Subjects: Acid separation; Diffusion dialysis; Polyaniline; Polypropylene; Diffusion dialysis; Polyaniline; Polypropylene; Acid separation
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2019.115989

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•Synthesis of chemically and thermally robust Polyaniline@polypropylene composite membrane.•Hydrophilic membranes prepared by polymerization of ortho-anisidine.•Acid diffusion from HCl and H2SO4 acid solutions are studied.•Acid recovery of 32–43% is achieved from the synthesized membranes.
Herein we have discussed the robust design and synthetic methodology of polyaniline based exceptional chemical and mechanical stable composite membrane for acid recovery by diffusion dialysis. Physicochemical characterization of the membrane was carried out to find its hydrophilic/hydrophobic characteristic and its effect on separation of HCl and H2SO4 from the simulated solution. The high retention of sulfuric acid or high permeation of HCl was explained on the basis of Gibbs free energy of hydration of Cl− and SO42− ions. The obtained diffusion coefficient (UH+) for PANI and A-PANI membrane was in the range of 0.013–0.042 m h−1 for HCl, H2SO4 and effluent solution. The maximum acid recovery was 43% for A-PANI and 32% for PANI. The acid recovery for locally available effluent solution was ∼34% indicating potential use of synthesized membranes in acid recovery by diffusion dialysis.