Nitrogen-Rich Magnetic Bio-Activated Carbon from Sericin: A Fast Removable and Easily Separable Superadsorbent for Anion
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Article www.springer.com/13233 pISSN 1598-5032 eISSN 2092-7673
Nitrogen-Rich Magnetic Bio-Activated Carbon from Sericin: A Fast Removable and Easily Separable Superadsorbent for Anionic Dye Removal Yeonkyung Hong1 Hyoung-Joon Jin*,1 Hyo Won Kwak*,2,3
1
Department of Polymer Science and Engineering, Inha University, 100 Inha-ro, Nam-gu, Incheon 22212, Korea 2 Department of Agriculture, Forestry and Bioresources, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea 3 Research Institute of Agriculture and Life Sciences, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea Received November 27, 2019 / Revised March 7, 2020 / Accepted June 6, 2020
Abstract: Activated carbon materials are moving away from traditional simple carbon-based porous materials to high-performance and functional materials. Thus, various attempts have been made to improve the performance and process efficiency of the emerging materials by doping with various heteroatoms, introducing functional nanoparticles, and modifying these materials using polymer chemistry. In this study, N and O heteroatom-doped activated carbon materials were prepared by using silk sericin, a by-product of the silk industry, as a raw material; magnetic nanoparticles were introduced into the heteroatom-doped activated carbon to prepare high-performance and easily separable adsorbent materials. N-doped activated carbon having a high surface area of 3289.1 m2 g−1 was prepared by a simple and one-step chemical activated sericin carbonization process without the generally required additional N-doping process. The subsequent introduction of magnetic nanoparticles (MNPs) not only facilitated the separation of nitrogen-rich bio-activated carbon from the contaminant solution, but also enhanced the capacity for adsorption of the anionic dye, methyl orange (MO; 869.57 mg g−1), with a faster MO removal rate compared to that of N-doped activated carbon without MNPs. In addition, by simply varying the pH of the solution, effective adsorption-desorption-based recycling could be achieved. This MNP-containing N-rich activated carbon can be applied as a high-performance adsorbent for the remediation of wastewater streams as it affords excellent adsorption efficiency, a fast removal rate, and easy separation from aqueous solution. Keywords: activated carbon, sericin, heteroatom, magnetic nanoparticle, dye removal, biosorbent.
1. Introduction Environmental pollution, including the pollution of soil, water, and air, is currently the number one priority to be addressed. Environmental pollutants have a critical impact on daily life through direct negative effects on the human body upon contact and indirectly through the ripple effect from the food chain.1 Water pollution has long been a crucial problem, and the damage caused by industrial development continues to increase.2 Heavy metal contamination, red-tide caused by eutrophication, and wastewater from the textile industry are the main sources of water pollution.3,4 It is thus necessary to minimize the ca
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