Low-Cost Magnetic Fe 3 O 4 /Chitosan Nanocomposites for Adsorptive Removal of Carcinogenic Diazo Dye
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ow-Cost Magnetic Fe3O4/Chitosan Nanocomposites for Adsorptive Removal of Carcinogenic Diazo Dye Avinash Kadama, b, Jiseon Jangb, c, Seong-Rin Limd, *, and Dae Sung Leeb, ** a
Research Institute of Biotechnology and Medical Converged Science, Dongguk University, Biomedi Campus, Ilsandong-gu, Goyang-si, Gyeonggi-do, 10326 Republic of Korea b Department of Environmental Engineering, Kyungpook National University, Buk-gu, Daegu, 41566 Republic of Korea cR&D Institute of Radioactive Wastes, Korea Radioactive Waste Agency, 174 Gajeong-ro, Yuseong-gu, Daejeon, 34129 Republic of Korea d Department of Environmental Engineering, Kangwon National University, Chuncheon, Gangwon, 24341 Republic of Korea *e-mail: [email protected] **e-mail: [email protected] Received March 22, 2017; revised February 26, 2018; accepted March 6, 2018
Abstract—The eco-friendly adsorptive removal of Congo red (CR) from aqueous medium using Fe3O4/chitosan nanocomposites was investigated. The nanocomposites were synthesized by using a cost effective reductive precipitation method. The structural characterization of nanocomposties was determined by field emission scanning electron microscopy, thermal gravimetric analysis, fourier transform infrared spectroscopy, and magnetic property measurement system. Successful coating of chitosan on the iron oxide nanoparticles was confirmed by field emission scanning electron microscopy. The synthesized nanocomposites showed a maximum adsorption capacity of 47 mg/g for CR from an aqueous solution. Based on non-linear regression, the Langmuir isotherm fitted the experimental data better than the Freundlich and Tempkin models. The separation factor (RL) calculated from the Langmuir adsorption isotherm indicated that CR adsorption on the nanocomposites was favorable. The obtained Fe3O4/chitosan nanocomposite is a cost-effective adsorbent and can be easily retrieved from an aqueous solution by a magnet after decontamination of CR. Keywords: Congo red, magnetic nanoparticles, chitosan, adsorption, reduction precipitation method DOI: 10.1134/S0040579520040193
INTRODUCTION Textile dyes are recognized as one of the larger groups of pollutants in the wastewater released from several industries [1]. Textile wastewater released into the environment is highly hazardous to aquatic flora and fauna [2]. Congo red (CR; 3'-([1,1'-biphenyl]4,4'-diyl)bis(4-aminonaphthalene-1-sulfonic acid) disodium salt] is a diazo benzidine-based anionic textile dye. The complex aromatic structure of CR makes biodegradation of this compound difficult. The structure of CR contains a benzidine moiety, and CR is known to be a potent human carcinogen [3]. Due to these deleterious health impacts, CR is banned in many countries, even though it is still extensively used in some of the developing countries. Thus, removal of CR from aqueous systems is a vital undertaking for environmental sustainability [2]. Adsorption is a low cost and economical technique for treatment of wastewater containing textile dyes [4, 5]. Different adsorbents such as alumina a
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