An alternative method of dispersive solid‐phase extracting Hg (II) from environmental aqueous solutions using carboxylic functionalized carbon nanotubes
Kamelia karimnezhad, Ali Moghimi, Rohana Adnan, Milad Abniki
Abstract
Abstract This study is a simple method for rapid sample preparation before instrumental experiment, which is an important tool and the main step in an analytical proceeding. Till now, different sample preparation procedures based on solid‐phase extraction manner were developed to isolate different types of analytes from different matrices. In this method, the preconcentration and removal of trace amounts of Hg (II) ion in aqueous samples with nanotubes functionalized carboxyl are displayed. The analysis of Hg 2+ ions concentration in water solutions was accomplished by flame atomic absorption spectroscopy. Some parameters including the pH, value, and type of desorption eluent solvent, extraction time, ions effect etc. were optimized. The Freundlich, Langmuir, Temkin, and Dubinin–Radushkevich models were employed to estimate Hg (II) ions adsorption. The Freundlich model was obtained from the study of isotherm studies. The kinetic studies demonstrate the adsorption of Hg (II) ions by adsorbent fitted with the pseudo‐second‐order type and resulting from that chemisorption is the rate‐limiting process in the Hg (II) adsorption. The concentration parameter such as level of detection of proposed method, and relative standard deviation test were obtained as 20.83, 6 µg L −1 , and 1.16%, respectively.