title: Preparation, characterization and application of N-2-Pyridylsuccinamic acid-functionalized halloysite nanotubes for solid-phase extraction of Pb(II).
abstract: Halloysite nanotubes (HNTs) were chemically modified with N-2-Pyridylsuccinamic acid (PSA) to produce a new nano-adsorbent (HNTs-PSA) for selective solid-phase extraction of Pb(II). The new adsorbent was characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), thermogravimetric analysis (TGA), and elemental analysis to evaluate the surface modification. Under the optimized conditions (pH 5, flow rate 1.5 mL min(-1)), Pb(II) was retained on the column packed with HNTs-PSA, and then was quantitatively eluted by 1.5 mL 0.5 mol L(-1) HCl and determined by inductively coupled plasma-optical emission spectrometry. An enrichment factor of 67 was obtained using 30 mg of HNTs-PSA. The maximum adsorption capacity for Pb(II) was found to be 23.58 mg g(-1). The detection limits of this method for Pb(II) was 0.32 μg L(-1). The relative standard deviation under optimum conditions was 3.4% (n = 11). The developed method was validated by analyzing a certified reference material, and then successfully applied to the determination of Pb(II) in actual samples.
authors.affiliation: Department of Chemistry, Lanzhou University, Lanzhou 730000, PR China. hequn@lzu.edu.cn
authors.forename: Qun
authors.initials: Q
authors.lastname: He
authors.forename: Dong
authors.initials: D
authors.lastname: Yang
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Deng
authors.forename: Qiong
authors.initials: Q
authors.lastname: Wu
authors.forename: Ruijun
authors.initials: R
authors.lastname: Li
authors.forename: Yunhui
authors.initials: Y
authors.lastname: Zhai
authors.forename: Lijun
authors.initials: L
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000138:chemical synthesis* / Q000737:chemistry*; D000077215:Clay; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000302:isolation & purification*; D057230:Limit of Detection; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry; D012212:Rheology; D052616:Solid Phase Extraction / Q000379:methods*; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013386:Succinates / Q000138:chemical synthesis* / Q000737:chemistry*; D013818:Thermogravimetry
chemical_list: D000538:Aluminum Silicates; D011725:Pyridines; D012996:Solutions; D013386:Succinates; D007854:Lead; D000077215:Clay