A Taiji-principle-designed magnetic porous C-doped graphitic carbon nitride for environment-friendly solid phase extraction of pollutants from water samples.

A new magnetic porous carbon-doped graphitic carbon nitride nanocomposite and experimental strategies were environment-friendly designed for solid phase extraction of brominated flame retardants from water sample. The easily synthesized and low cost nanocomposite was characterized using techniques, including Fourier transform infrared spectroscopy, X-ray diffraction spectrometry, elemental analysis, and transmission electron microscopy. The large surface area and enhanced interactions of this nanocomposite with its adsorption behavior in Taiji principle (a balance of hydrophilicity and hydrophobicity) in aqueous phase benefit the extraction. Magnetic solid phase extraction has advantages such as low solvent consumption and reusability of the sorbent, and was therefore employed in this study. In addition, a quicker and less laborious statistical method, known as response surface methodology, was used to investigate and optimize some crucial factors that affected the adsorption. The combined use of this new nanocomposite and experimental strategy showed excellent precision (2.7-5.2%) and sensitivity (limits of detection (S/N=3): 0.1-0.2 μg L(-1)). This method was successfully applied to the analysis of real water samples giving good spiked recoveries over the range of 92.4-99.8%. This research provides an environment-friendly strategy to prepare suitable sorbents for extraction or adsorption of various compounds within different matrices.