Preparation of Magnetic Sorbent with Surface Modified by C18for Removal of Selected Organic Pollutants from Aqueous Samples

World Multidisciplinary Earth Sciences Symposium 2017

Kurá, Pavel^1 ; Pilnaj, Dominik^1 ; Ciencialová, Lucie^2 ; Penika, Martin^1

Faculty of Environment, University of Jan Evangelista Purkyne, Kralova Vysina 7, Usti nad Labem

400 96, Czech Republic^1

Faculty of Science, University of Jan Evangelista Purkyne, Ceske Mladeze 8, Usti nad Labem

400 96, Czech Republic^2

关键词: Environmental applications;    Hazardous organic compounds;    Magnetically separable;    Physico-chemical stability;    Purification of water;    Sample preconcentration;    Solid-phase extraction;    Tetra-ethyl-ortho-silicate;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/95/4/042065/pdf
DOI  :  10.1088/1755-1315/95/4/042065

来源: IOP

【 摘 要 】

Magnetic sorbents have great potential in environmental applications due to their simple synthesis and separation in magnetic field, usability in heterogeneous systems and low toxicity. Possible syntheses, surface modifications and characteristics were described by Li et al 2013. This type of solid-phase extraction is being successfully used in various fields as health care, microbiology, biotechnologies or sample preconcentration in analytical chemistry. In this preliminary study we report on the preparation and application of magnetically separable sorbent with surface modified by C18alkyl chain for purification of water contaminated by environmentally hazardous organic compounds. Magnetic cores were co-precipitated from Fe2+and Fe3+chlorides in alkalic aqueous solution. Surface of synthetized Fe3O4was modified with SiO2by tetraethylorthosilicate to assure physico-chemical stability. Furthermore, Fe3O4/SiO2complex has been treated by C18functional group, which provides good affinity towards hydrophobic substances in water. Efficiency of sorption under various conditions has been examined on benzene, toluene, ethylbenzene and xylenes (BTEX), compounds found in petroleum products which contaminate air, soil and groundwater near of store tanks. Sorption kinetics was followed by gas chromatography with mass spectrometry. The preliminary sorption kinetics data and efficiency of BTEX removal point at the possible application of prepared magnetic sorbent for BTEX removal, especially for ethylbenzene and xylenes.