Efficient lead preconcentration using two chemically functionalized carbon nanotubes in hyphenated flow injection-flame atomic absorption spectrometry system

4‐Aminosalicylic Acid Functionalized Multiwalled Carbon Nanotubes for Rapid Removal of Crystal Violet Dye from Wastewater Using Minicolumn

“…After functionalization with 4‐aminosalicylic acid as shown in Figure 1b, a shift in few peaks were observed which shows the attachment of ASA on O‐CNT. A new peak at 1548 cm −1 appeared which represents N−H bending due to the formation of amide linkage between the carboxylic group of O‐CNT and the ‐NH 2 group of 4‐aminosalicylic acid, as already given in our previously published papers [19,20] …”

“…The sample flow rate affects the adsorption process as it optimizes the time of contact between adsorbent and analyte. Similarly, the eluent flow rate affects the desorption process [20] . The study of sample and eluent flow rate was done in the range of 2–6 mL min −1 .…”

“…The carbon nanotubes became more complexed and thicker in comparison to pristine MWCNTs. [20] Apart from this, the diameter of the carbon nanotubes also increased after functionalization as pristine MWCNTs have diameter in the range of 10-12 nm while the diameter of O-CNT increased to 11-13.57 nm, which further increased in CNT-ASA to 15-20 nm.…”

“…A new peak at 1548 cm À 1 appeared which represents NÀ H bending due to the formation of amide linkage between the carboxylic group of O-CNT and the -NH 2 group of 4-aminosalicylic acid, as already given in our previously published papers. [19,20]…”

“…Similarly, the eluent flow rate affects the desorption process. [20] The study of sample and eluent flow rate was done in the range of 2-6 mL min À 1 . It can be seen in Figure 4c, that there was a slight change of the sample flow rate has been observed on adsorption of CV onto CNT-ASA, in which maximum dye removal efficiency was obtained at a sample flow rate of 5 mL min À 1 .…”