Phthalate esters (PAEs) can interfere with the endocrine systems of humans and wildlife. The main objective of this study was to evaluate the suitability of a composite for remediating marine sediments contaminated with PAEs. The composite was synthesized with magnetite nanoparticles (Fe O ) and rice husk biochar (RHB) by using chemical co-precipitation. Fe O ,RHB,andFe O – 3 4 3 4 3 4 −� RHB substantially activated sodium persulfate (Na S O , PS) oxidation to form SO and thus degrade PAEs in marine sedi- 2 2 8 4 ments in a slurry system. The morphology and structural composition of the magnetic composites were examined using XRD, FTIR, environmental scanning electron microscopy–energy-dispersive X-ray spectrometry, and superconducting quantum inter- ference device. The Fe O –RHB composites were confirmed to be prepared successfully. The influences of various parameters, 3 4 including the PS concentration, composite loading, and initial pH, were investigated. The concentration of high-molecular-weight PAEs (HPAEs) in sediment was much higher than that of low-molecular-weight PAEs (LPAEs); di-(2-ethylhexyl) phthalate (DEHP) was an especially salient marker of PAE contamination in sediments. Furthermore, increasing the PS and Fe O –RHB 3 4 doses accelerated PAE oxidation at pH 3.0; 83% degradation
Environmental Science and Pollution Research – Springer Journals
Published: Jun 4, 2018
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