Multiwalled Carbon Nanotubes as a Solid-Phase Extraction Adsorbent for the Determination of Bisphenol A, 4-n-Nonylphenol, and 4-tert-Octylphenol

Abstract

The adsorptive potential of multiwalled carbon nanotubes (MWNTs) for solid-phase extraction of bisphenol A, 4-nnonylphenol, and 4-tert-octylphenol was investigated for the first time. The three analytes are quantitatively adsorbed on a MWNTs-packed cartridge, then the analytes retained on the cartridge are quantitatively desorbed with suitable amounts of methanol. Finally, the analytes in the methanol eluate are determined by high performance liquid chromatography-fluorometric detection. Parameters influencing the extraction efficiency, such as volume of the sample solutions, pH of the sample, and the eluent volume, were examined. Comparative studies showed that MWNTs were superior to C 18 for the extraction of the more polar analyte bisphenol A and at least as effective as C 18 for the extraction of 4-n-nonylphenol and 4-tert-octylphenol. Compared to XAD-2 copolymer, MWNTs exhibited a better property for the extraction of all three analytes. The developed method has been applied to determine bisphenol A, 4-n-nonylphenol, and 4-tert-octylphenol in several environmental water samples. The accuracy of the proposed method was tested by recovery measurements on spiked samples, and good recovery results (89.8-104.2%) were obtained. Detection limits of 0.083, 0.024, and 0.018 ng mL -1 for bisphenol A, 4-n-nonylphenol, and 4-tert-octylphenol, respectively, were achieved under the optimized conditions.

Barium alginate caged Fe3O4@C18 magnetic nanoparticles for the pre-concentration of polycyclic aromatic hydrocarbons and phthalate esters from environmental water samples

“…Nanomaterials, which possess nanosized diameter and large surface area, are being applied in numerous scientific fields [1][2][3][4]. In this regard many research groups have developed various types of nanosized SPE sorbents [5][6][7][8][9][10][11][12]. Compared with traditional SPE ones, these nanosized sorbents have high extraction efficiency with rapid extraction dynamics performance.…”

Recent advances in solid-phase sorbents for sample preparation prior to chromatographic analysis

“…Both of them have exhibited excellent adsorption properties as SPSs. The first application of CNTs was that MWCNTs were used for SPE and highly efficient enrichment was successfully achieved for BPA, 4-nnonylphenol and 4-tert-octylphenol from environmental water samples [31]. Recent advances of CNTs as SPSs (e.g., applied in SPE and SPME) were demonstrated by several excellent reviews [4,7,30].…”

“…CNTs and G/GO are the most widely used SPSs in extraction methods, including SPE, SPME, MSPD and SBSE. Table 3 summarizes recent popular applications of carbon nanomaterials used as SPSs in sample preparation prior to chromatography [23,25,31,.…”

Solid‐phase extraction of liquiritin and glycyrrhizic acid from licorice using ionic liquid‐based silica sorbent

“…It can help minimize the use of organic solvents, which were being regulated as priority pollutants [20]. The selection of sorbent is a key point in SPE [21] because it can control the analytical parameters, such as selectivity, affinity, and capacity [22,23]. For this reason, different types of surface modifications were used to modify the surface of classical SPE materials (such as silica and C 18 ) to increase the selectivity.…”