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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 30296

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Separation of Hazardous Brominated Plastics from Waste Plastics by Froth Flotation after Surface Modification with Mild Heat-Treatment
This study evaluated to facilitate separation of ABS plastics from other waste plastics by froth flotation after surface hydrophilization of ABS with heat treatment. The mild heat treatment at 100oC for 60s could selectively increase the hydrophilicity of the ABS plastics surface (i.e., ABS contact angle decreased from 79o to 65.8o) among other plastics mixture. The SEM and XPS results of plastic samples sufficiently supported the increase in hydrophilic functional groups and decrease contact angle on ABS surface, after heat treatment. As a result of the froth flotation (at mixing speed 150 rpm and airflow rate 0.3 L/min) after heat treatment, about 85% of ABS was selectively separated from other heavy plastics with 100% of purity. The effect of optimum treatment condition and detailed mechanism onto separation efficiency in the froth floatation was also investigated. This research is successful in giving a simple, effective, and inexpensive method for ABS separation from waste plastics.
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[1] F. Burat, A. Güney, M. O. Kangal, Selective separation of virgin and post-consumer polymers (PET and PVC) by flotation method, Waste Management, 29 (2009) 1807–1813.
[2] I. C. Nnorom, O. Osibanjo, Sound management of brominated flame retarded (BFR) plastics from electronic wastes: State of the art and options in Nigeria, Resources, Conservation and Recycling, 52 (2008) 1362–1372.
[3] Flame retardants & PVC in electronics, in: Green Chemistry Vs Toxic Technology, Electronics TakeBack Coalition, A Project of the Tides Center, pvc-and-electronics/.
[4] P. A. Wäger, R. Hischier, Life cycle assessment of post-consumer plastics production from waste electrical and electronic equipment (WEEE) treatment residues in a Central European plastics recycling plant, Science of The Total Environment, 529 (2015) 158–167.
[5] R. C. Thompson, C. J. Moore, F. S. vom Saal, S. H. Swan, Plastics, the environment and human health: current consensus and future trends, Philosophical Transactions of the Royal Society B, 364 (2009) 2153– 2166.
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[8] S. M. Al-Salem, P. Lettieri, J. Baeyens, Recycling and recovery routes of plastic solid waste (PSW): A review, Waste Management, 29 (2009) 2625–2643.
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[10] Korea Environmental Corporation, Present situation of waste generation and treatment, (2013).
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[12] S. Pongstabodee, N. Kunachitpimol, S. Damronglerd, Combination of threestage sink-float method and selective flotation technique for separation of mixed post-consumer plastic waste, Waste Management, 28 (2008) 475-483.
[13] R. D. Pascoe, Investigation of hydrocyclones for the separation of shredded fridge plastics, Waste Management, 26 (2006) 1126-1132.
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[18] H. Wang, X. L. Chen, Y. Bai, C. Guo, Z. Li, Application of dissolved air flotation on separation of waste plastics ABS and PS, Waste Management, 32 (2012) 1297–1305.
[19] T. Takoungsakdakun, S. Pongstabodee, Separation of mixed postconsumer PET–POM–PVC plastic waste using selective flotation, Separation and Purification Technology, 54 (2007) 248–252.
[20] S. Bigot, G. Louarn, N. Kébir, F. Burel, Facile grafting of bioactive cellulose derivativesonto PVC surfaces, Appl. Surf. Sci., 283 (2013) 411-416.
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[22] H. Alter, The recovery of plastics from waste with reference to froth flotation, Resources, Conservation and Recycling, 43 (2005) 119-132.
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[27] M. S. Reddy, K. Kurose, T. Okuda, W. Nishijima, M. Okada, Separation of polyvinyl chloride (PVC) from automobile shredder residue (ASR) by froth flotation with ozonation, Journal of Hazardous Materials, 147 (2007) 1051-1055.
[28] M. S. Reddy, K. Kurose, T. Okuda, W. Nishijima, M. Okada, Selective recovery of PVC-free polymers from ASR polymers by ozonation and froth flotation, Resources Conservation and Recycling, 52 (2008) 941- 946.
[29] T. Okuda, K. Kurose, W. Nishijima, M. Okada, Separation of polyvinyl chloride from plastic mixture by froth flotation after surface modification with ozone, Ozone: Science and Engineering, 29 (2007) 373-377.
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[31] C. Q. Wang, H. Wang, B. X. Wu, Q. Liu, Boiling treatment of ABS and PS plastics for flotation separation, Waste Management, 34 (2014) 1206- 1210.
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