Modified Bentonite with Dithizone as Nano Clay Mineral Adsorbent for Solid Phase Extraction of Silver Ions

Abstract

Abstract:In this work, a simple flow injection system incorporating a microcolumn of immobilized dithizone on bentonite coated with cetyltrimethylammonium bromide was combined with flame atomic absorption spectrometry (FAAS) for on-line separation/preconcentration and determination of trace amounts of silver in water. Dithizone was physically immobilized on the surfactant coated bentonite particles and was used as the adsorbent in the preparation of microcolumn. Silver ions were deposited by processing a standard or sample solution of analyte in the pH range of 3-9 through the microcolumn. Injection of 250 µL of thiourea (0.4 mol L −1 , pH = 5.0) served to elute the retained species to the FAAS. The capacity of the adsorbent under working conditions was found to be 7.2 mg of silver per gram of adsorbent. Processing a water sample volume of 30 mL resulted in an enrichment factor of 116. The method was successfully applied to the determination of silver in different natural waters and a certified reference material.

Removal of iron, zinc, and nickel-ions using nano bentonite and its applications on power station wastewater

“…FTIR measurements were carried out to demonstrate the chemical nature of the nano bentonite and to identify the possible interaction between Fe 3þ , Zn 2þ and Ni 2þ, and Nano bentonite [10]. The FT-IR spectra of Nano bentonite are shown in Figure 1.…”

Immobilization of Dithizone on Natural Bentonite as Adsorbent of Cd(II) Ion

“…Mudasir et al showed that dithizone-immobilized natural zeolite (13.1×10 -6 mol g -1 ) has higher capacity than activated natural zeolite (8.00×10 -6 mol g -1 ) to adsorb Hg(II) ion [9]. Shakerian et al reported that the adsorption capacity of dithizone-immobilized bentonite for Ag(II) was 7.2 mg Ag(II) per gram of adsorbent [10]. Parham et al confirmed that dithizone-immobilized cellulose acetate polymer membrane has capacity adsorption for Pb(II) and Cd(II)ions which were 787 and 195 mg g -1 , respectively [11].…”