Preparation of polyaniline iron oxide composite (PANI/Fe 3 O 4 ) for enhanced Congo red removal performance

作     者：X.P. Teng M.Y.K. Bryan P.V. Chai J.Y. Law 

作者机构：Department of Chemical & Petroleum Engineering Faculty of Engineering Technology & Built Environment UCSI University Cheras Kuala Lumpur 56000 Malaysia Process Engineering Technology Section Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology 78000 Alor Gajah Melaka Malaysia 

出 版 物：《Materials Today: Proceedings》 

年 卷 期：2021年第46卷

页      面：1875-1881页

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主　　题：Iron Oxide (Fe 3 O 4 ) Polyaniline (PANI) Polyaniline/Iron Oxide Composite (PANI/Fe 3 O 4 ) Congo Red (CR) Regeneration 

摘      要：Composite has emerged as one of the capable materials for wastewater treatment process. Out of many different types of composite, polyaniline/iron oxide (PANI/Fe 3 O 4 ) 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/Fe 3 O 4 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 Fe 3 O 4 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/Fe 3 O 4 composites were synthesized by physically mixing it with Fe 3 O 4 in acetone medium. Next, characterization of adsorbents was evaluated through Fourier-transform infrared spectroscopy (FTIR). Subsequently, the performance of PANI/Fe 3 O 4 composites at 0/100, 30/70, 50/50, 70/30 and 100/0 ratio were examined, and the results showed that, PANI/Fe 3 O 4 composite at 70/30 ratio achieved the highest CR removal at 89.62% as compared to other PANI/Fe 3 O 4 composite ratio. Besides that, PANI/Fe 3 O 4 composite at 70/30 ratio recorded 6.31% and 2.04% dye removal enhancement as compared to Fe 3 O 4 and PANI adsorbent respectively. Afterward, PANI/Fe 3 O 4 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/Fe 3 O 4 composite. The regenerated comp