title: Functionalized CMK-3 mesoporous carbon with 2-amino-5-mercapto-1,3,4-thiadiazole for Hg(II) removal from aqueous media.
abstract: Ordered mesoporous carbon (CMK-3) was synthesized and functionalized with 2-amino-5-mercapto-1,3,4-thiadiazole groups (AMT-OCMK-3) for Hg(II) removal from aqueous solution. The modified CMK-3 was characterized by X-ray diffraction, N2 adsorption-desorption isotherm, scanning electron microscopy and Fourier transform infrared spectroscopy. The effects of solution pH, contact time, initial Hg(II) concentration and matrix effect were studied. The adsorption data were successfully fitted with the Langmuir model, exhibiting high adsorption capacity of 450.45 mg/g of AMT-OCMK-3. In the solid-phase extraction system a series of experimental parameters such as sample flow rate, sample volume, eluent volume and concentration of the eluent solution have been investigated and established for preconcentration of Hg(II) in aqueous solution. The results showed that the enrichment factor for Hg(II) was 250, the precision (relative standard deviation (RSD), %) for six replicate measurements was 2.05% and the limit of detection for Hg(II) was achieved at 0.17 μg/L.
authors: Research Laboratory of Nanoporous Materials, Faculty of Chemistry, Iran University of Science and Technology, Iran. Electronic address: anbia@iust.ac.ir.
authors: Mansoor
authors: M
authors: Anbia
authors: Research Laboratory of Advanced Materials, Chemistry and Chemical Engineering Research Center of Iran, Tehran, Iran.
authors: Roghaye
authors: R
authors: Dehghan
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D008628:Mercury / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D052616:Solid Phase Extraction; D013830:Thiadiazoles / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D014961:X-Ray Diffraction
chemical_list: D013830:Thiadiazoles; D014874:Water Pollutants, Chemical; D002244:Carbon; C000592181:2-amino-5-mercapto-1,3,4-thiadiazole; D008628:Mercury
keywords: Adsorption; CMK-3; Hg(II); Ordered mesoporous carbon; Solid-phase extraction