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Article Abstract
In this study, we synthesized polystyrene coated persulfate polyacrylonitrile beads (PC-PSPANBs) to control persulfate (PS) release for targeted PAHs' degradation in a batch reactor. Initially, the persulfate release rate (k = 20.553 h) from PSPANBs was fast, but coating the PSPANBs with polystyrene controlled PS release rate (k= 2.841 h), nearly ten times slower than without coating. When Fe(II) activated PC-PSPANBs applied for 12 h degradation of acenaphthene (ACE), 2-methlynaphthalene (2-MN) and dibenzofuran (DBF), the optimum percent removal efficiencies (% R.Es) were as ACE (82.12%) > DBF (68.57%) > 2-MN (58.80%) and the optimum degradation rate constants (k) were found as ACE (11.348 h) > 2-MN (3.441 h) > DBF (1.101 h). The effect of SO and Cl on ACE degradation showed that % R.E and k were enhanced with increasing anionic concentrations. The maximum % R.E was achieved for SO (76.24%) > Cl (65.51%), but the highest k was in case of Cl (1.536 h) > SO (0.510 h). The effectiveness of PS release longevity was also found because net degradations of ACE and DBF after first spiking were 12 mg L and 16 mg L, while after second spiking were 18 mg L and 10 mg L, respectively.
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| http://dx.doi.org/10.1016/j.jhazmat.2021.125879 | DOI Listing |
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