Supporting information In Situ Hydrothermal Grown of TiO 2 @C Core-Shell Nanowire Coating for High Sensitive Solid Phase Microextraction of Polycyclic Aromatic Hydrocarbons Fuxin Wang, Juan Zheng, Junlang Qiu, Shuqin Liu, Guosheng Chen, Yexiang Tong, Fang Zhu* and Gangfeng Ouyang* MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China * Corresponding author. Tel. & Fax: +86-20-84110845 E-mail: ceszhuf@mail.sysu.edu.cn; cesoygf@mail.sysu.edu.cn. S-1
Figure S1. Low-magnification SEM image of the section of the TiO 2 fiber S-2
Figure S2. EDS line scan of the TiO 2 @C sample Figure S3. EDS spectra of the TiO2@C sample S-3
Figure S4. N 2 adsorption-deposition isotherm of the amorphous carbon Figure S5. The O 1s core level XPS spectrum of TiO 2 @C sample S-4
Figure S6. The chromatogram of TiO 2 and TiO 2 @C fiber at the same condition (Sample volume, 10ml; 2 μg L -1 PAHs solution, extraction time, 60 min; extraction temperature, 45 C; salt concentration, 24% (w/v); deposition temperature 250 C, deposition time 300 s.). S-5
Optimization of SPME parameters. In order to obtain the best extraction performance, SPME parameters, including extraction time, extraction temperature, desorption temperature and NaCl concentration, were optimized. The experiments were conducted at the concentration of 200 μg L -1 for PAHs. According to the result, the optimal conditions were as follows: extraction time 60 min, extraction temperature 45 C, desorption temperature 250 C, NaCl concentration 24 g / 100 ml. Figure S7. Effects of SPME conditions on the extraction efficiencies of TiO 2 @C fiber. (a) Desorption temperature; (b) extraction time; (c) extraction temperature; (d) salt concentration. S-6
Table S1. The Comparison of LODs Between the Novel Core-Shell TiO 2 @C Fiber and the Other Works compounds LOD a (ng L -1 ) TiO 2 @C 1 2 3 4 5 6 fiber naphthalene 7.07 3.9 2.7 8.0 17 acenaphthylene 1.02 1.4 acenaphthene 0.48 0.3 1.64 8.1 100 fluorene 0.41 0.9 2.15 4.2 50 4 anthracene 4.0 2.1 1.92 4.0 50 3 phenathrene 3.24 3.4 2.14 50 43 References: (1) Zheng, J.; Liang, Y.; Liu, S.; Ding, Y.; Shen, Y.; Luan, T.; Zhu, F.; Jiang, R.; Wu, D.; Ouyang, G., Ordered Mesoporous Polymers in situ Coated on a Stainless Steel Wire for a Highly Sensitive Solid Phase Microextraction Fibre. Nanoscale 2015, 7, 11720-6. (2) Zhang, S.; Du, Z.; Li, G., Layer-by-layer Fabrication of Chemical-bonded Graphene Coating for Solid-phase Microextraction. Anal. Chem. 2011, 83, 7531-7541. (3) Abolghasemi, M. M.; Karimi, B.; Yousefi, V., Periodic Mesoporous Organosilica with Ionic Liquid Framework as a Novel Fiber Coating for Headspace Solid-phase Microextraction of Polycyclic Aromatic Hydrocarbons. Anal. Chim. Acta 2013, 804, 280-286. (4) Es-haghi, A.; Hosseininasab, V.; Bagheri, H., Preparation, Characterization, and S-7
Applications of a Novel Solid-phase Microextraction Fiber by sol-gel Technology on the Surface of Stainless Steel Wire for Determination of Poly Cyclic Aromatic Hydrocarbons in Aquatic Environmental Samples. Anal. Chim. Acta 2014, 813, 48-55. (5) Guo, M.; Song, W.; Wang, T.; Li, Y.; Wang, X.; Du, X., Phenyl-functionalization of Titanium Dioxide-nanosheets Coating Fabricated on a Titanium Wire for Selective Solid-phase Microextraction of Polycyclic Aromatic Hydrocarbons from Environment Water Samples. Talanta 2015, 144, 998-1006. (6) Sun, M.; Feng, J.; Qiu, H.; Fan, L.; Li, X.; Luo, C., CNT-TiO 2 Coating Bonded onto Stainless Steel Wire as a Novel Solid-phase Microextraction Fiber. Talanta 2013, 114, 60-5. S-8