“…Carbon nanotubes have a high surface area, mechanical strength and chemical stability (Iijima, 1991), and the sol–gel technique is an efficient method for making homogenous sorbents that can be used in NTDs with high purity, intense mixing and thermal stability (Kumar et al, 2008). Single‐wall carbon nanotubes with sol–gel as a new sorbent have been applied to extract toluene, xylene isomers and methyl ethyl ketones in water and urine samples (Zeverdegani, Bahrami, Rismanchian, & Shahna, 2014; Zeverdegani, Bahrami, Shahna, et al, 2014).…”