Preparation of polyaniline iron oxide composite (PANI/Fe3O4) for enhanced Congo red removal performance. (2021)

• Record Type: Journal Article
• Authors: Teng, X.P.; Bryan, M.Y.K.; Chai, P.V.; Law, J.Y.
• Is Part Of: Materials today. Volume 46:Part 5(2021)
• Page Start: 1875
• Page End: 1881
• Publication Date: 2021
• Subjects: Iron Oxide (Fe3O4) -- Polyaniline (PANI) -- Polyaniline/Iron Oxide Composite (PANI/Fe3O4) -- Congo Red (CR) -- Regeneration; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2021.01.766
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Composite has emerged as one of the capable materials for wastewater treatment process. Out of many different types of composite, polyaniline/iron oxide (PANI/Fe3 O4 ) composite has proven its worth in tackling water pollution attributed to its high surface area and the ability to tune the surface charge of the composite to enhance adsorption performance. In order to produce a high-performance composite, the ratio of PANI/Fe3 O4 composite and the operating condition during the removal process should be addressed. Realizing this importance, the present work seeks to alter different PANI concentration on the surface of Fe3 O4 nanoparticles to promote Congo red (CR) removal performance and investigate the best operating condition for the adsorbent. First, PANI was synthesized through chemical polymerization method in the presence of ammonium persulfate as oxidizing agents and aniline monomers in acidic medium at low temperature. Then, PANI/Fe3 O4 composites were synthesized by physically mixing it with Fe3 O4 in acetone medium. Next, characterization of adsorbents was evaluated through Fourier-transform infrared spectroscopy (FTIR). Subsequently, the performance of PANI/Fe3 O4 composites at 0/100, 30/70, 50/50, 70/30 and 100/0 ratio were examined, and the results showed that, PANI/Fe3 O4 composite at 70/30 ratio achieved the highest CR removal at 89.62% as compared to other PANI/Fe3 O4 composite ratio. Besides that, PANI/Fe3 O4 composite at 70/30 ratio recorded 6.31% and 2.04% dye removal enhancement as compared to Fe3 O4 and PANI adsorbent respectively. Afterward, PANI/Fe3 O4 composite performance was evaluated by varying the temperature (25–45 °C), adsorbent dosage (0.01–0.1 g) and dye concentration (20–50 ppm) and results showed that, operating condition at 45 °C, 0.1 g and 20 ppm provide the highest CR removal. The experiment was proceeded with regeneration studies to measure the reusability of the PANI/Fe3 O4 composite. The regenerated composite managed to retain at high dye removal efficacy of 77.4% after five cycles of adsorption-desorption.