Ionic liquid-immobilized silica gel as a new sorbent for solid-phase extraction of heavy metal ions in water samples

Abstract

Novel C18-alkylimidazolium ionic liquid immobilized silica (SiO2–(CH2)3–Im–C18) was synthesized through a four-step procedure. It showed high efficiency for the separation/preconcentration of trace heavy metal ions from aqueous samples.

Hexafluorophosphate ionic liquid-modified silica sorbent for selective separation and preconcentration of Pb2+, Cd2+, and Cr3+ in water samples

“…According to preliminary studies and experiments, HNO 3 / ethanol (1.0 mol L −1 ) was used as a good eluent for column elution to cleave metal complexes' bonds. 37 As shown in Fig. 10, quantitative recoveries were afforded with Cr 3+ and Pb 2+ using 1 or 2 mL of HNO 3 /ethanol (1.0 mol L −1 ).…”

“…The molar ratio of metal ions and PAN (1 : 6) was applied for the present method, followed by our previous report. 58 A small amount of KCl was added to enhance the ionic force, and Triton-X 100 played the role of a surfactant to dissolve all the precipitate to generate a homogeneous solution.…”

“…Immobilization of ILs to silica materials and the diversity of IL structures offer a new approach to application in analytical chemistry. [36][37][38] Liu and co-workers rst introduced ionic liquid-immobilized silica for headspace solid-phase microextraction of benzene, xylene, toluene, and ethylbenzene. 39 In the last decade, the ILs supported onto silica gel used as efficient sorbents in SPE have been studied intensively.…”

DABCOnium Ionic Liquid‐Immobilized Silica Gel for Solid Phase Extraction of Phenoxyacetic Acid Herbicides in Water Samples**

“…Firstly, silanol groups on the silica surface were activated under an acidic solution [38] . After the hydrolysis reaction of bare silica gel, the condensation of (3‐chloropropyl)triethoxysilane with activated silica gel was employed in the presence of triethylamine catalyst to provide 3‐chloropropyl silica [39–40] . Finally, the nucleophilic substitution reaction of (3‐chloropropyl)triethoxysilane and 1,4‐diazabicyclo[2.2.2]octane was carried out for 24 h to produce silica‐supported ionic liquids.…”

Insights into brewed tea waste as a green and low-priced adsorbent for solid-phase extraction of Cd(II) ions: isotherm, kinetic, and artificial neural network approach

“…Nevertheless, a separation and preconcentration method is generally indispensable before the analysis due to the existence of analyte ions at too low concentration levels to be precisely determined by modern instrumental methods and the complicated matrices that cause interferences during the analysis (Shahryari et al 2022). Solid-phase extraction (SPE) method in which the analyte ions are extracted from the aqueous solution onto a solid adsorbent has a promising potential exhibiting a practical, facile, costeffective, and reliable sample pretreatment process (Nguyen et al 2022;Kocaoba 2022).…”