TiO₂ nanotube arrays prepared by anodization as an adsorbent in micro‐solid‐phase extraction to preconcentrate and determine nitrogen‐containing polycyclic aromatic hydrocarbons in water samples

Abstract

In this study, a simultaneous determination method for nitrogen-containing polycyclic aromatic hydrocarbons including 7-methylquinoline, acridine, 5,6-benzoquinoline, carbazole, and 9-methylcarbazole was developed. This method is based on a micro-solid phase extraction using TiO2 nanotube arrays as an adsorbent in combination with HPLC. Some factors that had an effect on the enrichment were optimized, such as sample pH, surfactant concentration, ion strength, type of eluent, equilibrium time, and desorption time. Under the optimized conditions, the linear ranges and LODs were in the range of 0.01-100 and 0.0035-0.81 μg/L, respectively. The precisions of the proposed method were <9.51% (RSD, n = 6). The developed method was validated with four real samples, and the spiked recoveries were in the range of 77-109.6%. All these results demonstrated that this novel micro-solid-phase extraction technique was a reliable alternative to conventional preconcentration method for the extraction and analysis of such nitrogen-containing polycyclic aromatic hydrocarbons in complex samples.

MIL-101(Fe)@TiO2 nanotube composite material is used for the solid phase extraction of non-steroidal anti-inflammatory drugs under the synergy of multiple interactions

“…19 It has rich surface properties, such as: ① several Ti 4+ sites with a coordination number of 6 on its surface, which exhibits Lewis acidity and can coordinate with Lewis basic groups (Lewis acid–base effect). 20 ② There are also some hydroxyl groups on its surface with an isoelectric pH of approximately 5, which can exhibit Lewis acidity or alkalinity at different pH values. All these characteristics suggest that it can interact with many other materials and has the potential to be applied in a variety of fields.…”

A core–shell titanium dioxide polyaniline nanocomposite for the needle‐trap extraction of volatile organic compounds in urine samples

“…Among the different compounds largely used as inorganic fraction, titanium dioxide has recently received particular attentions. This is due to its high chemical stability, durability, corrosion resistance, nontoxic, and different band gap energies, which broaden its applications in photocatalytic , electrochemical systems , and separation and extraction techniques . As far as the core–shell nanocomposite synthesis is concerned, encapsulation of TiO 2 NPs inside the conductive polymers shell is widely popular and feasible.…”

Extraction and determination of polycyclic aromatic hydrocarbons in water samples using stir bar sorptive extraction (SBSE) combined with dispersive liquid–liquid microextraction based on the solidification of floating organic drop (DLLME-SFO) followed by HPLC-UV

“…Several sample pretreatment techniques, such as liquidliquid extraction (LLE), 6 solid-phase extraction (SPE), 7,8 cloudpoint extraction (CPE), 9 hollow ber liquid-phase microextraction (HF-LPME), 10,11 miniaturized homogeneous liquidliquid extraction (MHLLE) 12 and solid-phase microextraction (SPME), based on TiO 2 nanotube array [13][14][15][16] and multiwall carbon nanotubes [17][18][19] have already been developed for the extraction of PAHs.…”